Banca de QUALIFICAÇÃO: FELIPE DUARTE SOARES BARBOSA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : FELIPE DUARTE SOARES BARBOSA
DATE: 21/07/2022
TIME: 09:00
LOCAL: Videoconferência
TITLE:

USE OF BOVINE ACTIVATED CARBON AS ADSORBENT AGENT FOR REMOVAL OF 2,4-D HERBICIDE (DICHLOROPHENOXYACETIC ACID)

KEY WORDS:

Herbicide, activated carbon, adsorption, dichlorophenoxyacetic acid

PAGES: 40
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

The advance of agriculture and the need for high food productivity has brought constant concern about the wide use of herbicides. These compounds have a relatively affordable cost and are quite effective in controlling weed crops. Among these herbicides we can highlight dichlorophenoxyacetic acid (2,4-D), the second most used among herbicides in Brazil and in Alagoas, which has among its applications the sugarcane, a strong crop of Alagoas agriculture. In this work, a study was carried out on the feasibility of using carbon from bovine bones as an adsorbent for the removal of this herbicide. Adsorption is a very versatile method and has a relatively low cost while activated carbon is a material widely used in this technique because it mainly has a high surface area and a well-developed porous structure. Among the available particle diameters, in addition to pulverized carbon, the particle size 20x50 (granular activated carbon) was used after a comparison test with the particle size 6x30. It was verified that the adsorption process is favored using a pH value equal to 2, reaching an efficiency approximately 25% greater in relation to the second best pH condition, which would be pH 3. After performing the kinetic test, it was found that, in general, the removal efficiency of the two particle sizes was similar, and that pulverized coal reaches equilibrium at a much more interesting speed, about 30 minutes, while granular coal (20x50) takes about 120 minutes. In relation to the kinetic models, the pseudo-first order and pseudo-second order models were tested and the best fit was the pseudo-second order, having higher R² values and lower mean relative error values, indicating a probable chemical adsorption process. These tests were performed at three different concentrations, 30, 50 and 100 mg/L, in which the adsorption process had a better percentage of removal at the concentration of 30 mg/L.

BANKING MEMBERS:
Externo à Instituição - ANTONIO MARTINS DE OLIVEIRA JUNIOR - UFS
Externo ao Programa - 1154549 - KLEBER JEAN LEITE DOS SANTOS
Interno - 1797785 - LUCAS MEILI
Interno - 3182573 - RODOLFO JUNQUEIRA BRANDAO
Presidente - 496.472.704-10 - SANDRA HELENA VIEIRA DE CARVALHO - UFAL