Banca de DEFESA: ELINE DIAS BARBOSA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ELINE DIAS BARBOSA
DATE: 26/07/2023
TIME: 09:00
LOCAL: Online
TITLE:

CHARACTERIZATION OF DIFFERENT BIOCHARS PRODUCED IN THE MERIDIONAL AGRESTE OF PERNAMBUCO

KEY WORDS:

Agricultural waste; biochar; adsorption-desorption; phosphate

PAGES: 52
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SUMMARY:

Biochar is a product rich in carbon, being considered one of the potential products used to promote significant changes in soil characteristics and in the productivity of agricultural crops. Currently, several waste materials are recommended for biochar production, however, due to its diverse composition, it may be difficult to establish a standard classification for biochar. Thus, the present work aimed to characterize three biochars produced from cashew wood (BCW), sewage sludge (BSS) and chicken litter (BCL), determining the specific surface area (SSA) through the absorption of blue of methylene (BM), as well as the adsorption and desorption of phosphate (PO₄^3-) by colorimetry. The research was carried out under laboratory conditions at the Federal University of Agreste de Pernambuco (CENLAG/UFAPE). The experiment was conducted in a completely randomized design (CRD) with three biochars: BCW; BSS and BCL, with three replications for each biochar. The values of SSA, adsorption and desorption of PO₄^3- were measured. Data were submitted to analysis of variance (ANOVA) using the F test and means compared using Tukey's test at a 5% probability level. The results of the PO₄^3- adsorption and desorption tests were established, quantified and adjusted to the mathematical models of Langmuir and Freundlich. For BSS and BCL, the SSA is relatively low, and they do not fit the Langmuir model, while the BCW showed better fits with higher values. As for the adsorption and desorption capacity of (PO₄^3-), the experimental data agreed very well with the Langmuir isotherm, however the adsorption capacity for the three biochars did not reach the plateau. However, it is important to emphasize that these results are specific to the types of biochars and study conditions used, and may vary depending on manufacturing intrinsics such as pyrolysis temperature and residence time. In future research, researchers will be able to use these results as a basis for the development of further studies, deepening the knowledge on the subject and validating or refuting the results found. In this way, the experiment contributes to the advancement of scientific knowledge and provides a solid basis for future research in the area.

COMMITTEE MEMBERS:
Presidente - JOSE ROMUALDO DE SOUSA LIMA
Interno - ALEXANDRE TAVARES DA ROCHA
Externa ao Programa - ***.352.124-** - MARIA CAMILA DE BARROS SILVA - UFRPE
Externo à Instituição - CLAUDE HAMMECKER