Banca de DEFESA: DIOGO CARLOS HENRIQUE

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : DIOGO CARLOS HENRIQUE
DATE: 12/09/2022
TIME: 14:00
LOCAL: Videoconferência
TITLE:

PRODUCTION OF CaAl/HDL FROM CALCINATED WASTE OF THE SHELL OF Mytella falcata

KEY WORDS:

Eco-friendly. Layered Double Hydroxides. Fish farm waste

PAGES: 145
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUMMARY:

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

BANKING MEMBERS:
Interna - 1527220 - CAMILA BRAGA DORNELAS
Externo ao Programa - 3064870 - DANIEL PINTO FERNANDES
Externo à Instituição - DISON STRACKE PFINGSTEN FRANCO
Externo à Instituição - JOSÉ LEANDRO DA SILVA DUARTE - UFAL
Presidente - 1797785 - LUCAS MEILI
Externo à Instituição - ROBSON COSTA DE SOUSA - UFES