Banca de QUALIFICAÇÃO: ANDRÉ RICARDO CALCIOLARI
Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.STUDENT : ANDRÉ RICARDO CALCIOLARI
DATE: 09/11/2021
TIME: 14:00
LOCAL: Plataforma Microsoft TEAMS
TITLE:
EVALUATION OF BIOCARBON PREPARATION FROM THE PYROLYSIS OF COFFEE SILVER SKIN AND ITS FEASIBILITY IN REMOVING Pb2+ IONS FROM AQUEOUS MEDIUM
KEY WORDS:
Response Surface Methodology. Biochar. Adsorption. Heavy metals. Pyrolysis.
PAGES: 119
BIG AREA: Engenharias
AREA: Engenharia de Minas
SUMMARY:
The mining sector stands out as one of the industrial activities that most impact the environment. The increasing demand for mineral goods and new technologies have required the beneficiation of low-grade or difficult-to-process ores. As a result, the amount of waste generated has increased significantly. These tailings contain a wide range of heavy metals that can contaminate soil and water resources. In addition to it, the agricultural/agro-industrial sector, which is also responsible for the generation of a large amount of waste of other nature, also impacts the environment if improperly discarded. In this way, several types of biochar have been evaluated as promising alternatives to improve water and soil quality, revealing beneficial potential for the environment. Thus, the motivation of this research is based on the idea of establishing a link of environmental sustainability between the mineral and agricultural/agro-industrial sectors. Therefore, the idea of using biochar, produced from agro-industrial residues as an and low-cost adsorbent to remove heavy metals from mining activities becomes significant and necessary. The production of biochar with desirable sorption characteristics can be achieved by optimizing the pyrolysis process conditions and by the physical or chemical activation of the material surface. Although activation has several advantages, as a rule, it results in high costs. From this perspective, this work aims to optimize the conditions of preparation of coffee silverskin biochar, varying the pyrolysis conditions during its obtainment, without, however, proceeding with its activation. Finally, we want to evaluate the feasibility of using optimized biochar in the removal of metallic cations that are potentially toxic in bodies and watercourses. Biochar will be produced in a muffle furnace, without the use of purge gas, at five pyrolysis temperatures (338° C, 400° C, 550° C, 700° C and 768° C) with residence times of 95, 120, 180, 240 and 265 minutes, at a heating rate of 10° C/min. This experimental design has its origins in a central composite design 22, with five repetitions in the center. The effects of the pyrolysis temperature and residence time variables on the adsorption capacity of biochar will be initially investigated using the methylene blue dye. The adsorption experiments will be carried out in batches. Kinetic and adsorption equilibrium experiments for biochar will also be carried out. The biochar with the best adsorption performance will be investigated for its ability to adsorb Pb2+ ions from aqueous solutions. For this biochar, additional characterizations will also be carried out regarding its surface area and porosity (BET), presence of surface functional groups (FTIR), recalcitrance and aromaticity (DRX) and surface homogeneity and pore formation (SEM). Biochar with the best adsorption performance is expected to present desirable characteristics, such as high satisfactory surface area, pH and surface chemical functionality, to be used in the removal of potentially toxic metallic cations from contaminated water and soil.
BANKING MEMBERS:
Externo ao Programa - ANTONIO LENITO SOARES JUNIOR
Presidente - MARIO GUIMARAES JUNIOR
Interno - NATAL JUNIO PIRES
Externo ao Programa - PAULO FERNANDO RIBEIRO ORTEGA