Banca de DEFESA: LUIZ EDUARDO FREITAS DE MOURA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LUIZ EDUARDO FREITAS DE MOURA
DATE: 17/07/2025
TIME: 14:00
LOCAL: NUPEG I - UFRN
TITLE:

ADSORPTION OF REACTIVE DYES “RED AND BLUE S-MATRIX 150” USING COAL ASH FROM PYROLYSIS OF PENNISETUM PURPUREUM

KEY WORDS:

reactive dyes; elephant grass; ash; adsorption; kinetics; batch study.

PAGES: 125
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Processos Industriais de Engenharia Química
SPECIALTY: Processos Orgânicos
SUMMARY:

The expansion and industrial growth in the world have contributed to the formation of new categories of organic pollutants, such as pesticides, hygiene products, surfactants, pharmaceuticals and dyes. These pollutants are regularly found in aquatic environments, through the discharge of industrial effluents, promoting toxicity to the environment and the species that inhabit there. Industrial dyes have in their composition different organic groups such as: “azo and anthraquinones”, these groups are toxic to living beings, some being, therefore, carcinogenic upon prolonged exposure. Thus, this work produced ash from biochar originated from the pyrolysis process of elephant grass, where this prepared material was used as an adsorbent, in addition to the use of commercial activated carbon for the adsorption of individual dyes such as Bezaktiv red S-matrix 150 and blue S-matrix-150. The adsorbent produced from elephant grass pyrolysis coal was modified by a physical process where it was placed in an oven at 800°C for 5h and then chemically treated with 3.5M NaOH. Subsequently, the adsorbents were characterized with XRD, XRF, FTIR, SEM and EDS. The adsorption process occurred in batch where both adsorbents were tested on raw and chemically treated ash. For the batch process, the following variables were studied: mass and nature of the adsorbent, dye concentration, pH, temperature and adsorption time. In the treatment of the results, the adsorption isotherms related to the Langmuir and Freundlich models were obtained, the pseudo kinetics of 1st and 2nd order were investigated and finally, the controlling mechanism was identified using the Weber-Morris equation and the Elovich kinetic model. Finally, the experiments were carried out with synthetic solutions of the two dyes, which simulated a real effluent. It was subsequently determined from the results obtained that the best adsorbent studied was the ash produced only with thermal treatment, in which they obtained a removal percentage of 96.75% in the red dye s-matrix 150 and a percentage of 88.75% in the blue dye s-matrix 150.

COMMITTEE MEMBERS:
Presidente - 1670497 - HUMBERTO NEVES MAIA DE OLIVEIRA
Interno - 1149554 - OSVALDO CHIAVONE FILHO
Externo ao Programa - 1213158 - ANDRE ANDERSON COSTA PEREIRA - UFRNExterno à Instituição - FRANCISCO PIO DE SOUZA ANTAS - IFRN