Banca de DEFESA: SANNYELE ALCANTARA EMILIANO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : SANNYELE ALCANTARA EMILIANO
DATE: 02/09/2021
TIME: 15:00
LOCAL: Videoconferência (Via Google Meet)
TITLE:

Characterization, production and evaluation of the adsortive capacity of Activated Carbon obtained from  vacuum pyrolysis of the species Dipteryx alata Vog. (Baru)

KEY WORDS:

Reuse of biomass; Activated charcoal; Adsorption

PAGES: 112
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

Considering that Brazil generates approximately 41 million tons of agricultural waste annually, this makes it one of the countries with the greatest capacity to incorporate technologies for reuse of them. Where among the various wastes with the potential to become an energy production source and transformation in the chemical industry, we have the barueiro (Dipteryx alata Vog.), a species of arboreal plant originating in the fertile regions of the Brazilian cerrado whose fruit is baru. This species has been considered one of the most promising for cultivation due to its multiple use. From the fruits, the pulp is consumed in the form of flour and sweets, while the seeds (almonds), after toast, can be used in the preparation of various culinary preparations, in addition to the extraction of excellent quality oil. However, there are few studies on the use of its endocarp, which may become an environmental problem due to the large volume generated. With the objective of making this waste a product with high added value, it is necessary to treat it through transformation processes, highlighting pyrolysis among the existing ones. This method creates shorter chain compounds such as non-condensable gases, biochar and liquid product.Biochar, through the chemical activation process, becomes a viable raw material to be used in the adsorption of organic and inorganic compounds. That said, the present work aimed at the production and characterization baru activated carbon (Dipteryx alata Vog.) to study its viability as bioadsorbent, through the performance of isotherm and adsorption kinetics tests, which allow to evaluate the efficiency that it will have in removing of phenol from effluents. For the development of the study, a series of tests were carried out, involving from the preparation of the raw material to obtaining charcoal by the vacuum pyrolysis process and from the material obtained, its characterization, subjecting it to adsorption tests.Pyrolysis was carried out at a temperature of 500ºC, considered favorable for obtaining coal by thermogravimetric analysis of biomass, under a heating rate of 10ºC. min -1 , with residence time of 120 minutes. The average yield in charcoal, bio-oil and gases reached values of 25.63%, 56.47% and 17.90%, respectively. To evaluate the quality of the final products of the pyrolysis process and the characteristics of the biomass used, characterization techniques were used, such as: elementary composition, immediate and thermogravimetric analysis, Infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM), Method BET and pH point of zero charge (pHcz). Since the baru endocarp biochar presented a high fixed carbon content, low volatile and ash contents, it can be considered as a quality charcoal, with higher gravimetric yield.Measuring the behavior of this charcoal related to its pH point of zero charge, it can be concluded that it has a heterogeneous surface, with pHcz = 7.9, that allow its interaction with components of anionic or cationic nature.Attesting to these results, the adsorption tests carried out point to a favorable system, and which possibly occurs in monolayers on the surface of the material, pointing out chemisorption as a determining step of the kinetic mechanism.

BANKING MEMBERS:
Presidente - 1456420 - RENATA MARIA ROSAS GARCIA ALMEIDA
Interno - 1774383 - EDUARDO LUCENA CAVALCANTE DE AMORIM
Interno - 1121112 - JOAO INACIO SOLETTI
Interna - 1775449 - TATIANE LUCIANO BALLIANO
Externo à Instituição - ANTONIO MARTINS DE OLIVEIRA JUNIOR - UFS