Banca de QUALIFICAÇÃO: JOYCE AZEVEDO BEZERRA DE SOUZA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : JOYCE AZEVEDO BEZERRA DE SOUZA
DATE: 22/06/2023
TIME: 09:00
LOCAL: meet.google.com/qtw-rthf-kqr
TITLE:

Phenol removal in water samples using persulfate and zero iron-activated supported on biochar

KEY WORDS:

henol; Advanced Oxidative Processes; Sodium Persulfate; Zero Valence Iron; Biochar

PAGES: 92
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Tratamentos e Aproveitamento de Rejeitos
SUMMARY:

Modernization, high population growth and the acceleration of inputs are triggering the generation of large amounts of industrial wastewaters, which are currently a serious global problem, as they can contaminate water, soil and air. Wastewaters, mainly from the oil industry and its derivatives, have in their composition several contaminants with toxicological, carcinogenic and mutagenic properties, which can compromise the quality of the environment and cause negative effects on human, animal and plant health. Among the contaminants we can highlight phenol, which is one of the most common pollutants in various types of wastewaters. Phenol is listed as a pollutant of priority study by the United States Environmental Protection Agency and is classified as toxic, with contact at low concentrations in water. For the treatment of water contaminated with this pollutant, Advanced Oxidative Processes (AOP) have been widely used. In this work, sodium persulfate was used as oxidant, since when activated it is capable of generating the sulfate radical for degrading phenol. For the activation of sodium persulfate, a zero-valence iron (ZVI) system supported on biochar (BC) was used. Therefore, in this work was carried out the synthesis of biochar and ZVI used as persulfate activator.  Biochar and ZVI were morphologically characterized by means of FRX, XRD, SEM-EDS, zeta potential analysis, particle size and polydispersion index. Regarding the oxidation experiments, an experimental design was carried out in which the variables analyzed were the concentration of the oxidant ([PS] = 1 to 9 mM) and of the reducing agent (1 to 5 g.L-1). Based on the information from the first experimental planning, the second one was carried out by studying the concentration of the oxidant ([PS] = 5 to 13 mM), the activating agent (3 to 7 g.L-1) and the pH (3.0 to 11.0). An experimental design of the homogeneous type and one in which the activating agent was commercial Fe0 were carried out, seeking to confront them with the proposed AOP. From the characterization of the materials, it was observed that the synthesized material was similar to that synthesized by other literature reported works. The synthetized system consisted of a carbonaceous material, with pores in its structure and that accommodated the ZVI in a way that allowed the ZVI particles to agglomerate and provide oxidation to take place. Regarding the oxidation tests, the first experimental design carried out with BC/ZVI to activate sodium persulfate, the best test was number 4, with the conditions of [PS] = 9 mM and [BC/ZVI] = 5 g.L- 1. From the second planning carried out, it was verified that the best pH for the process was pH=3.0 and that the optimal conditions were also [PS] = 13 mM and [BC/ZVI] = 7 g.L-1 and reached 89. 12% removal. Among the experimental designs carried out, the one carried out with BC/ZVI proved to be the most effective for the removal of phenol.

COMMITTEE MEMBERS:
Presidente - 1149554 - OSVALDO CHIAVONE FILHO
Externa à Instituição - MARIA CARLENISE PAIVA DE ALENCAR MOURA - UFRN
Externo à Instituição - RAONI BATISTA DOS ANJOS - UFRN