Banca de DEFESA: JOYCE AZEVEDO BEZERRA DE SOUZA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JOYCE AZEVEDO BEZERRA DE SOUZA
DATE: 24/07/2023
TIME: 14:00
LOCAL: Auditório do NUPEG
TITLE:

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

KEY WORDS:

Phenol; Advanced Oxidative Processes; Sodium persulfate; Zero valence iron; Biochar

PAGES: 95
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Tratamentos e Aproveitamento de Rejeitos
SUMMARY:

Modernization, rapid population growth, and increased production of inputs are triggering the generation of substantial volumes of industrial effluents. This escalating global issue poses a serious threat as it can contaminate water, soil, and air. The oil industry stands as the primary source of water contamination, both through its products and by-products, harboring numerous contaminants with toxicological, carcinogenic, and mutagenic properties. Such pollutants not only jeopardize the quality of the environment but also have adverse effects on human, animal, and plant health. Phenol, a prominent pollutant associated with this industry, is found in effluents such as petroleum-derived water and refinery by-products. Advanced Oxidative Processes (AOP) involving the use of sodium persulfate (PS) as an oxidant and a combination of zero valence iron (ZVI) supported on biochar (BC) have been widely employed for treating water contaminated with phenol. Therefore, this study aimed to utilize Persulfate-Activated Oxidation (POA) using sodium persulfate (PS) as an oxidant and a combination of zero valence iron (ZVI) supported on biochar (BC) for treating phenol-contaminated water. The biochar was derived from the pyrolysis of Calotropis procera fruit peels at a temperature of 300 °C for 1 hour, with a heating rate of 10 °C .min-1. The ZVI, on the other hand, was obtained through a chemical reduction method. The BC, ZVI, and BC-supported ZVI (BC/ZVI) were morphologically characterized using techniques such as XRF, XRD, SEM-EDS, FTIR, BET, zeta potential analysis, particle size analysis, and polydispersion index determination. For the experimental setup, a design was implemented in which the key variables were the oxidant concentration ([PS] = 1 to 9 mM) and BC/ZVI ratio ([BC/ZVI] = 1 to 5 g. L-1). Subsequently, process optimization was conducted by examining the oxidant concentration ([PS] = 5 to 13 mM), activator concentration ([BC/ZVI] = 3 to 7 g. L-1), and pH range (3.0 to 11.0). Furthermore, a comparison was made between the activating agent and commercial Fe0 to assess their effectiveness in the proposed AOP. The material characterization results revealed that the synthesized biochar shared similarities with previous works in the literature, featuring a carbonaceous structure with porous regions and various oxygenated groups on its surface. The synthesized ZVI exhibited structures designed to facilitate the availability of ZVI particles for oxidation. The oxidative treatment results indicated that the proposed PS/BC/ZVI system was efficient in phenol degradation, yielding satisfactory phenol removal rates. Through process optimization, the best conditions were achieved in test 4, with optimal parameters of [PS] = 13 mM, [BC/ZVI] = 7 g. L-1, and pH = 3.0, resulting in a maximum removal rate of 89.12%. The degradation of phenol using PS activated with BC/ZVI, as observed in this study, demonstrates its effectiveness in treating effluents and reducing toxicity levels in cases of water body contamination without proper treatment.

COMMITTEE MEMBERS:
Presidente - 1149554 - OSVALDO CHIAVONE FILHO
Interna - 1979301 - RENATA MARTINS BRAGA
Externo à Instituição - RAONI BATISTA DOS ANJOS - UFRN
Externa à Instituição - VIVIAN MARIA DE ARRUDA MAGALHÃES - UFRN