Nitrate contamination of water bodies is an environmental and public health problem, as its removal by conventional methods is limited. In this context, adsorption stands out as an efficient alternative, especially when associated with the development of sustainable materials. The generation of construction and demolition waste (CDW) has increased significantly due to urban expansion and construction activities, making this waste widely available and environmentally problematic when disposed of improperly. In this scenario, the valorization of CDW as a functional raw material has stood out as a sustainable, low-cost strategy aligned with the principles of the circular economy. In parallel, graphene oxide (GO) has aroused increasing scientific interest in recent years due to its high surface area, two-dimensional structure, and abundance of oxygenated functional groups, characteristics that favor adsorption processes. The incorporation of graphene oxide (GO) into low-cost matrices, such as construction and demolition waste (CDW), emerges,
therefore, as a promising approach for the development of efficient and environmentally sustainable adsorbent materials.

Thus, the present study aimed to develop and evaluate the efficiency of a composite based on construction and demolition waste (CDW) and graphene oxide synthesized via a green route from coconut straw biomass, aiming at its application in the removal of nitrate in aqueous effluents.

To this end, a composite was developed from CDW and graphene oxide-P derived from coconut straw biomass. The composite was characterized using XRD, SEM, and pHPCZ techniques, and its adsorptive capacity was also evaluated through batch adsorption tests, kinetic studies, and column tests in order to simulate the construction of a sustainable filter. The results indicated that
coconut palm straw is a viable precursor for the synthesis of graphene oxide, presenting a yield of approximately 52%. The RCD+ OG-P composite reached a maximum adsorption capacity of 49.51 mg/g, with a removal efficiency greater than 90% at neutral pH, a significantly superior performance to isolated RCD. In column tests, the material showed stable behavior for higher concentrations, with a breakthrough time of 15 minutes for a concentration of 100 mg/L, demonstrating its potential for application in continuous filtration systems. Thus, the developed composite presents itself as an efficient, sustainable, and low-cost alternative for nitrate removal in contaminated water.

In this work, electrospun polycaprolactone membranes containing silver nitrate (AgNO₃) and activated carbon (AC) were developed and characterized. The aim was to obtain a new nano-structured and multifunctional material for application in wound dressings.

Nanofibrous polycaprolactone (PCL) membranes were produced and impregnated with 0.5% silver nitrate and different concentrations of activated carbon (2%, 10%, 15%, and 20%). Initially, the activated carbon was impregnated with 0.5% silver nitrate and characterized by Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray Spectroscopy (EDS), as well as Thermogravimetric Analysis (TGA).

Subsequently, the additives were incorporated into the PCL polymeric solution, and the resulting mixture was subjected to the electrospinning process, producing nanofibrous membranes.

The obtained membranes were characterized by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM/EDS), Thermogravimetric Analysis (TGA), and Differential Scanning Calorimetry (DSC).

Cytotoxicity evaluation using the MTT assay in human keratinocytes revealed that membranes containing 2%, 10%, and 15% AC maintained cell viability above 71.9%. However, the concentration of 20% AC reduced cell viability to 24.5%.

Results from the antimicrobial susceptibility test (AST) indicated that nanofibers containing 10% activated carbon combined with silver ions formed inhibitory halos against the bacterial strains Serratia marcescens, Escherichia coli, and ESBL-producing Klebsiella pneumoniae.

The 0.5% silver concentration meets safety limits, and activated carbon concentrations of up to 15% demonstrated biocompatibility. The synergistic effect between these components reinforces the potential of these nanocomposites for advanced applications in wound treatmen

Acai (Euterpe oleracea Mart.), a fruit native to the Amazon region, has gained worldwide prominence for its nutritional and functional properties. However, approximately 85% of the fruit's volume corresponds to the seed, a byproduct frequently discarded by the industry, representing a significant environmental liability. Recent studies indicate that this fraction contains bioactive compounds with antioxidant, anti-inflammatory, antidiabetic, and antimicrobial potential, making it a promising source for applications in therapeutic systems and sustainable technologies. In this context, this thesis aimed to develop and characterize controlled-release systems, namely polymeric nanoparticles and liposomes, incorporating hydroalcoholic or protein extracts of acai seeds, with a view to the full utilization of this natural resource. The research was structured in two experimental stages. The first step consisted of the extraction, quantification, and characterization of bioactive compounds present in the hydroalcoholic extract of açaí seed (EHSA), highlighting total phenols, flavonoids, catechins, and procyanidins, in addition to evaluating antioxidant activity using spectrophotometric methods (DPPH, FRAP, ABTS, TBARS). The hydroalcoholic extract showed high antioxidant activity and was selected for the formulation of polymeric nanoparticles using emulsification-evaporation and precipitation techniques. The developed nanoparticles, composed of PCL and Eudragit or PCL and Pluronic, were characterized in terms of size, zeta potential, morphology, encapsulation efficiency, thermal stability, and release profile of the active compounds. Polymeric nanoparticles loaded with hydroalcoholic extract demonstrated significant antioxidant activity and inhibition of α-amylase and α-glucosidase enzymes, indicating potential use as an adjuvant in glycemic control, in addition to antibacterial activity against Gram-positive (Staphylococcus aureus) and Gram-negative (Pseudomonas aeruginosa) strains. In the second stage, a protein extract from açaí seed (EPSA), rich in proteins, peptides or amino acids and amines with functional potential, was obtained and characterized. This extract was incorporated into self-emulsifying liposomal systems, here called LEPSA. These systems were analyzed for their physicochemical properties, stability, encapsulation efficiency, and biological activity. Characterization included FTIR and AFM spectra, DLS analysis, and tests of cell viability, antioxidant activity, and leishmanicidal activity. The results obtained showed that both the polymeric systems and liposomes presented excellent performance in terms of stability, encapsulation, and bioactivity. Liposomes containing the protein extract (EPSA) showed promise in terms of antioxidant activity and exhibited leishmanicidal effect in vitro, with reduced cell viability in a dose-dependent manner. Thus, the thesis contributes to the valorization of agro-industrial waste using nanotechnology and encapsulation of bioactive compounds, offering sustainable and efficient alternatives for applications in the pharmaceutical, cosmetic, and nutraceutical areas. In the environmental area, it mitigates environmental impacts associated with the disposal of açaí seeds. The research also strengthens the circular economy approach, promoting the rational and integral use of natural resources with high functional value.

Fingerprints have a key role in criminal investigations as one of the most used physical
traces in identifying criminals. To face the challenge of development latent fingerprints
on cartridge cases, this work proposes a new methodology based on double
development through the electrodeposition of poly(3,4-ethylenedioxythiophene)
(PEDOT) and the corrosion suffered by the surface. The technique exploits the
sebaceous deposit of the fingerprint as an isolation mask, so that the electrochemical
deposition processes can only act on grease-free areas on the metal surface, i.e.
between the ridges of the fingerprint residue. PEDOT was electrodeposited by
oxidation of the monomer in LiClO4/H2O solution using potentiodynamic and
potentiostatic deposition methods, with a platinum counter electrode, Ag/AgCl
reference electrode (KCl sat.).The results indicate a double development of the
fingerprint on cartridge cases (brass) involving the electrodeposition of PEDOT and
the corrosion suffered by the surface. Applying lower electrical potentials (0.9 - 1.0 V)
the development by PEDOT presents higher quality and for higher electrical potentials
(1.1 - 1.4 V) development by corrosion was suggested in the studied samples. The
electrodeposition process led to metal dissolution/oxidation processes, resulting in
surface coatings, which are believed to be a mixture of polymer and Cu2O on the
surface of the electrodes. The brass cyclic voltammograms showed potentials of 0.18
V and 0.22 V due to the formation of Cu2O, while at 0.32 V and 0.34 V the formation
of CuO may have occurred. The present study presents an efficient methodology for
development latent fingerprints on 9 mm caliber cartridge cases, even after 30 days in
which sebaceous residues were left on the surface. The quality of fingerprint
development was evaluated by forensic software and confirmed using the scale
developed by the UK Home Office Center for Applied Science and Technology (CAST),
obtaining 57%, 38% and 20% of prints developed with grade 3 (development strong)
through PEDOT in 7.62, 5.56 and 9 mm caliber cartridge cases, respectively; and 38%
and 36% with grade 3 through corrosion in 5.56 and 9 mm caliber cartridge cases,
respectively. However, the development in deflagrated cases presented grade 1-2.
Thus, the joint evaluation of the results demonstrated that it is possible to successfully
employ double revelation through PEDOT electrodeposition together with corrosion of
the metal surface as a revelation method.

The increasing emission of carbon dioxide (CO2) caused by human activities has led to serious environmental problems, such as global warming and climate change. The sugarcane industry in Brazil holds significant potential for sustainability, especially through the use of molasses, a carbon-rich byproduct. Microbial electrosynthesis offers an innovative solution, utilizing bioelectrochemical systems (BES) to convert CO2 into biological products, facilitated by electroactive bacteria like Geobacter and Shewanella. These bacteria facilitate the conversion by transferring electrons to the electrodes. Experiments showed that biocathodes increased current about a month after inoculation, especially at -0.8 V and -1 V vs. Ag/AgCl, with significant negative current peaks (-60 A/m²) indicating robust reduction reactions. Additionally, the system without electrical stimulation generated 1.9 mV, demonstrating the presence of bacteria that enhance energy generation and indicating that the medium naturally generates energy. FTIR analyses revealed different chemical bonds and compounds in the biofilms, with peaks at 1720 cm⁻¹ and 1100 cm⁻¹ suggesting the formation of compounds like acetate. Principal Component Analysis (PCA) highlighted key variables in electrosynthesis performance, while Venn diagrams showed microbial diversity with shared and unique Operational Taxonomic Units (OTUs). This set of techniques confirms the potential of microbial electrosynthesis to reduce CO2 emissions, promoting a circular economy by transforming industrial waste into valuable resources.

Ultra-High Performance Concrete (UHPC) possesses high strength and durability, but exhibits incomplete hydration, high autogenous shrinkage, and low toughness. This study investigated the synergistic combination of active silica, marble and granite processing waste (MGW), high-modulus polyethylene fibers (HMPE), and superabsorbent polymers (SAPs) to overcome these limitations through the synergistic effect of the additions. The research was organized into five phases: (i) formulation of the reference UHPC with mineral additions (Article 1); (ii) addition of HMPE to the UHPC (Article 2); (iii) characterization of SAPs (Article 3); (iv) physico-chemical study of pastes with SAP and (v) mechanical investigation of UHPC with SAP only and with the combined addition of HMPE and SAP, both discussed in Article 4. The results confirmed the feasibility of the mineral additions to meet the normative parameters for UHPC. The presence of HMPE contributed to the reduction of volumetric variation and the increase in toughness, without significantly affecting the compressive strength of the UHPC. It was also observed that the absorption capacity of the SAPs is influenced by the ionic composition of the solution, especially in the presence of polycarboxylate-
ether-based superplasticizers, but their addition to UHPC promoted improved internal curing and reduced shrinkage, although the residual pores compromised the mechanical performance. However, the simultaneous incorporation of HMPE and SAP B, which yielded the most favorable result, mitigated these pores, restricted crack propagation, and increased toughness, resulting in a synergistic effect that improved the composite's properties. Thus, the advances achieved provide support for the production of more efficient and durable UHPCs, contributing to the application of these composites in high-demand structures.

The search for concrete constructive elements with functional classification, capable of adequately responding to different actions and stresses, has been the subject of research aiming at functional grading, stratification, additive manufacturing, and 3D printing as pathways for concrete elements to behave effectively, without waste, with improved competitiveness, and greater efficiency. The technique of stratification, allocating concretes in layers, is the most accessible and has been applied by several authors to achieve concrete with better performance. This research aimed to study the mechanical and electrothermal properties of stratified concrete elements with functional classification (CECF), focusing on the behavior of beam and slab elements under pure bending, and walls under electrothermal actions and aggressive agents. For this purpose, concretes with normal density (CDN) and low density, foam cellular concrete (CCE), the latter in two foam dosages (10% and 20%) referred to as CCE10 and CCE20 respectively, were produced. These concretes served as references. CECF were produced in two layers (CCE1020 and CCE20CDN) and in three layers (CCE1020CDN), factors such as specific mass, concrete position in the mold, and time of deposition between layers were determined. All concretes were produced on two different days, on the first day called 1st molding, and on the second day called Replica. Each concrete was tested for compression, tension, modulus of elasticity, pure shear, electrical resistivity, thermal conductivity, and resistance to high temperature. The compressive strength of the concretes showed values greater than 20 MPa, classifying them as structural concretes. In the four-point bending test, stratification had positive effects, resulting in practically equal or higher results compared to reference concretes. In the modulus of elasticity test, there was a reduction in values compared to CDN values; however, there was a gain compared to individual concretes CCE10 and CCE20. In the pure shear test, all stratified concretes (CCE1020, CCE20CDN, and CCE1020CDN) presented practically the same value of pure shear stress, around 5.5 MPa. In the high-temperature compression resistance test, the behavior of the concretes subjected to 200ºC and 400ºC was quite similar. The stratified concrete CE1020 showed the least variation compared to the other concretes. The electrical resistivity of stratified concretes was higher than 20 KΩ.cm, making them negligible for reinforcement corrosion development. The heat flow of the concretes was also determined, with CCE1020 concretes showing the best performance, as they are composed of concretes with lower specific mass. Overall, stratified concretes showed better performance compared to reference concretes, proving that they can bring better benefits to concrete elements.

Brazil is the world's largest producer of sugarcane, generating
up to 0.28 tons of bagasse per ton processed. This bagasse is a
promising source of lignocellulosic biomass, with an estimated
production of up to 167.9 million tons. However, it is estimated
that 10% of the bagasse produced is not used for energy
generation by the mills. This work aims to valorize this residue
by using it as a template for the production of Al 2 O 3 by the
replica method. Structured materials with predetermined
dimensions were synthesized using sugarcane bagasse,
followed by wet impregnation with 3 mass ratios of Ni: 5% (5Ni/
Al 2 O 3 -dp), 10% (10Ni/ Al 2 O 3 -dp) and 20% (20Ni/Al 2 O 3 -dp). For
comparison, powdered catalysts with 5% Ni (m/m), with and
without sugarcane bagasse, were synthesized:
5Ni/DryBCA_Al 2 O 3 -p and 5Ni/Al 2 O 3 -p, respectively. The catalysts
were characterized by energy dispersive X-ray fluorescence
spectroscopy (EDX), thermogravimetric analysis (TGA), X-ray
diffraction (XRD), scanning electron microscopy (SEM), N 2
physisorption at 77 K and temperature programmed reduction of
H₂ (TPR-H 2 ). The catalysts were tested for the production of
ordered carbon and hydrogen via catalytic decomposition of
methane (DCM) at 500 °C for 30 minutes. The formed carbon
was characterized by TGA and transmission electron
microscopy (TEM). Among the studied catalysts, 20Ni/Al 2 O 3 -dp
presented the highest catalytic activity, 45%. When comparing
catalysts with the same metal content and reduced at 600 °C,
the 5Ni/Al 2 O 3 -dp and 5Ni/DryBCA_Al 2 O 3 -p catalysts did not
exhibit catalytic activity.

Fingerprints and several other traces found at a crime scene participate in a group of traces that must be analyzed to help clarify the criminal fact. One of the most common procedures in forensic investigation is the development of latent fingerprints (IDLs). These procedures are responsible for promoting the visualization of the fingerprint for the purpose of use as a primary source of identification. This work seeks to bring a proposal for the revelation of IDLs on metallic surfaces through the electrodeposition of silver nanoparticles (AgNP) through the potentiostatic method (PST) on stainless steel, brass, and copper surfaces through the reduction of silver (Ag) in a solution of potassium nitrate (KNO3/H2O). The results suggest that the electrodeposition of AgNPs is an innovative and sensitive methodology to reveal IDLs in the different substrates studied, proving to be efficient in recent and aged samples. According to the evaluation of the quality of the results carried out using the recommendations of the SWGFAST (Scientific Working Group on Friction Ridge Analysis, Study and Technology), the results obtained presented a high level of observed detail being categorized between medium-high and high-quality. According to the scale definitions of the UK Home Office grading scale, the development of 97.7% of the samples evaluated so far reached the highest levels of detail, showing strong and very strong development. Analyzes using forensic comparison software recognized several characteristic patterns such as bifurcations, core, delta, and end of line.

The three-dimensional microfabrication via direct laser writing techniques has opened a
window of opportunities for research and technological applications in several areas such
as optical communication, microfluidics, synthesis of new materials, 3D scaffolding for
cell culture, construction of optical microdevices, and others. The possibility of building
a 3D optical device directly on a substrate or inside a transparent bulk has driven research
groups and engineers around the world to design and develop integrated micro-optical
systems capable of manipulating light signals and making them interact with mechanical,
electronic, fluid, chemical and biological elements. The works developed during this Phd
represents a small but substantial contribution for this line of research. Initially, the twophoton
polymerization technique was used to write a helical axicon, a light micromodulator
able to convert Gaussian beams into structured beams possessing orbital
angular momentum, whose profile is described by a superposition of high-order Bessel
beams. By means of a modifying laser process, we have written channel waveguides
inside silver-doped tellurite glassy blades. The waveguide’s optical properties and the
writing parameters were analyzed as a function of the matrix composition and of the silver
nanoparticles concentration. Finally, we have built annular waveguides, capable for
guiding light beams carrying orbital angular momentum, inside boroaluminosilicate
glassy blades. In addition, we have proposed a coupling method that permits tuning the
guided modes for the same waveguide and no need to modify the input beam. Our findings
expand the available degrees of freedom for optical beams in photonic circuits, simplify
the design of integrated optical chips and broaden the spectrum of possible applications
for these systems.

Metallic materials and metallic alloys, are widely used as materials in the most diverse areas, due to their advantages. Carbon steel, for example, is the most widely used metal alloy and one of the most widely produced materials in the world.  On the other hand, most metals and their alloys in their pure form are highly reactive and suffer corrosion, a thermodynamically spontaneous process, resulting in their deterioration. One of the most practical methods of protecting materials is the use of corrosion inhibitors. Some inhibitors, however, are potentially polluting and harmful to human health, this motivates the search for new formulations. The literature reports the use of natural products, called "green inhibitors", the plant extracts stand out within this class of inhibitors. In this perspective, in the present work it was accomplished a prospection about the applicability of vegetal extracts as green inhibitors of corrosion and the development of these inhibitors from 3 vegetal extracts of different sources: leaves of Eucalyptus globulus Labill, Sargassum vulgare seaweed and grains of Paullinia cupana (guaraná), in the protection of the 1020 carbon steel. In the prospection bases of scientific articles and patents were consulted and the documents found were analysed. The extracts were characterized by spectroscopic and chromatographic techniques, and their inhibition activities were evaluated by gravimetric and electrochemical techniques. A total of 335 articles and 42 patents related to the theme were retrieved, being most of the extracts prepared from leaves for the protection of carbon steel in acid medium. In the characterization of the extracts were identified types of bonds and compounds, as terpenes and phenolic acids, that demonstrate the possibility of application of these extracts as corrosion inhibitors. The used techniques showed that in all studied concentrations the extracts increased the charge transfer resistance, provoked potential displacement and decreased the parameters related to corrosion, reaching 89.97 % of maximum anticorrosive efficiency. Moreover, the adsorption of molecules, in the presence of the extracts, on active sites of the carbon steel surface was physisorption and obeyed the Frumkin adsorption isotherm. The proposed inhibitors are presented as non-toxic, cheap, abundantly available in nature and of easy extraction, characterizing them as green corrosion inhibitors.

This thesis addresses alternative treatment for tooth caries, one of the endemic diseases that affects all humanity. It also presents the use of a natural product from regional biodiversity – Brazilian Red Propolis (PVA), an exclusive bioproduct from Alagoas, Brazil - as an additive for dental supplies that improves the quality of caries treatment, adding value and increasing treatment efficiency. The PVA obtained from a controlled source was prepared to obtain the hexane extract, which was duly qualified by liquid chromatography to determine flavonoid and phenol contents, the results of which reached between 7.35% and 117.6 mg of total phenols per gram of dry hexane extract. A DPPH scavenging study was carried out, where the IC50 of the DPPH radical scavenging capacity of the PVA hexane extract was 9.22 μg/mL while the IC50 of Trolox, used as standard, was 7.02 μg/mL. After qualifying the extract, 5 different ionomer compositions were formulated with the addition of PVA dry extract, which were subjected to antibacterial activity tests by diffusion, which confirmed the ability to release daidzein, liquiritigenin, pinobanksin, isoliquiritigenin and formononetin. Mechanical surface roughness tests were carried out, which revealed similar values between the surfaces of the glass ionomer in the control group and that of the ionomer with 0.5% hexane extract. The analysis of the microhardness of materials (Knoop hardness) proved that there was no statistically significant difference in the microhardness of the additives in relation to the commercial product of the non-additivated ionomer. The determination of the (qualitative) fluoride release profile was carried out by NMR using an unprecedented procedure, revealing the viability of fluoride release, regardless of the presence of PVA in the ionomer mixture. A fluoride release study was also carried out using fluorometry, demonstrating the quantitative release of fluoride, both in the presence and absence of PVA. The results of biological, chemical and mechanical tests, carried out in vitro and here presented, are very favorable to the indication of the use of PVA as an additive in glass ionomer, allowing us to recommend moving towards in vivo studies.

Skin lesions are still considered a major challenge in the health area, considering that current dressings are, to a large extent, imported and expensive. Dressings can be primary, when used in direct contact with the injured tissue, and bioactive, with a role in the healing cascade. Thus, this work aims to develop bioactive primary dressings with polymeric matrix of polycaprolactone (PCL), containing silver nanoparticles (AgNP-P) obtained by biogenic synthesis with red propolis from Alagoas. For this, the synthesized and dried nanoparticles were incorporated in different concentrations (1, 2 and 5%) in fixed polymer concentration (9%). The dressings were prepared using casting and electrospinning techniques, resulting in films and fibers, respectively. In the case of fibers, they were optimized with the aid of scanning electron microscopy (SEM), in which average fiber diameter and porosity were seen. For the characterization of the materials were utilized techniques of X-ray diffraction (XRD), thermogravimetry (TG), differential scanning calorimetry (DSC), infrared spectroscopy (FTIR), as well as essays of water contact angle, swelling, silver release by inductively coupled plasma optical emission spectrometry (ICP-OES), antimicrobial activity, cytotoxicity and mechanical activity. As a result, the best conditions for the fibers were a voltage of 15kV, 12 cm distance between needle-collector and needle of 1.2 mm in diameter, leading to a nanofibers porosity of approximately 85%. The crystalline planes of metallic silver visualized by XRD confirmed the presence of AgNP-P. TG curves showed a decomposition of products similar to the pure polymer, while DSC allowed observing a decrease in the melting temperature corroborated by the crystallinity of the compounds that was also reduced due to the increase in the concentration of AgNP-P. FTIR spectras revealed that AgNP-P seems to be impregnated only by physical interaction with the polymer in both production techniques. The products obtained by electrospinning showed a higher swelling and silver release capacity compared to the films. Consequently, the nanofibers with the highest concentration of silver (E-5%) showed bacterial inhibition with a release of only 0.0833 µg/mL in 24h against the evaluated bacteria, being, therefore, the product of choice for the next analyses. Finally, E-5% showed no toxicity against L929 cells, similar to fibroblasts, and exhibited properties of elasticity and resistance suitable for use as dressings. Thus, it was possible to conclude that the electrospinning processing demonstrated better results in the properties of the dressings and the use of nanoparticles biosynthesized with propolis was essential for a product with antimicrobial activity without presence of toxicity.

The volume of waste produced by malacoculture activities generates great impact and high costs for proper treatment and disposal, constituting one of the greatest environmental problems in the world. Faced with this problem, for the first time, the feasibility of introducing malacoculture residue for the production of lamellar double hydroxides (HDLs) was studied. Shells of Mytella falcata were used to produce calcium oxide, which was later used as a reagent for the synthesis of HDL by the coprecipitation method. The thermal behavior of the materials was mapped up to 900 °C by determining the TG/DTG curves, while the textural and surface characteristics were studied by zero charge pH (pHPCZ), Scanning Electron Microscopy (SEM) and by adsorption/ N2 desorption (BET, BJH), composition was determined by Energy Dispersive X-ray Spectroscopy (EDS), chemical groups by Fourier Transform Infrared (FTIR) and crystallinity along with other structural properties were determined by X-Ray Diffraction (DRX). The characterizations allowed to identify the composition of Mytella falcata residue, consisting mainly of calcium carbonate with aragonite and calcite polymorphs, low surface area, irregular and rough morphology composed of a conglomerate of overlapping plates. Calcium oxide was obtained from shells with temperatures above 800°C, showed morphology, particle size distribution, decomposition intervals, crystallinity and other characteristics similar to the commercial material, indicating that it is a possible substitute for HDL synthesis. The material CaAl/HDL – RE was produced with calcium oxide from the residue of Mytella falcata with high crystallinity, surface area 65.62% greater than the material (CaAl/HDL – PA), produced with commercial reagent, classified as mesoporous, formed by plates in the form of hexagonal sheets arranged in an overlapping fashion, with a zero charge potential equal to 12.25. With removal efficiency of 98.51% of malachite green dye and 23.30% greater capacity than CaAl/HDL – PA for the removal of the antibiotic Sulfanilamide. Thus, these results corroborate the thesis that it is possible to use Mytella Falcata Residue (RMF) for the production of CaO – RE and synthesis of CaAl/HDL – RE