Kinetic adsorption study of textile dye “Reactive yellow BF-4G 200%” through adsorption using natural and activated smectite clays

Geraldo Martins Rodrigues Filho; Valdinete Lins da Silva; José Francisco da Luz Neto; Anderson Deodato da Silva; Gilson Lima da Silva; Mohand Benachour; Márcia Maria Lima Duarte

Authors

Geraldo Martins Rodrigues Filho Universidade Federal do Rio Grande do Norte – PPGEQ/UFRN/Departamento de Engenharia Química - DEQ/ Centro de Tecnologia – CT, Av. Sen. Salgado Filho 3000 - Campus Universitário CEP 59.072-970 - Natal/RN – Brasil.
Valdinete Lins da Silva Universidade Federal de Pernambuco – UFPE/Departamento de Engenharia Química - DEQ/Centro de Tecnologia e Geociências – CTG, Rua Artur de Sá, s/n – CEP 50740-521 – Recife/PE – Brasil.
José Francisco da Luz Neto Universidade Federal de Pernambuco – UFPE/Departamento de Engenharia Química - DEQ/Centro de Tecnologia e Geociências – CTG, Rua Artur de Sá, s/n – CEP 50740-521 – Recife/PE – Brasil.
Anderson Deodato da Silva Universidade Federal de Pernambuco – UFPE/Departamento de Engenharia Química - DEQ/Centro de Tecnologia e Geociências – CTG, Rua Artur de Sá, s/n – CEP 50740-521 – Recife/PE – Brasil.
Gilson Lima da Silva Universidade Federal de Pernambuco – UFPE/Departamento de Engenharia Química - DEQ/Centro de Tecnologia e Geociências – CTG, Rua Artur de Sá, s/n – CEP 50740-521 – Recife/PE – Brasil.
Mohand Benachour Universidade Federal de Pernambuco – UFPE/Departamento de Engenharia Química - DEQ/Centro de Tecnologia e Geociências – CTG, Rua Artur de Sá, s/n – CEP 50740-521 – Recife/PE – Brasil.
Márcia Maria Lima Duarte Universidade Federal do Rio Grande do Norte – PPGEQ/UFRN/Departamento de Engenharia Química - DEQ/ Centro de Tecnologia – CT, Av. Sen. Salgado Filho 3000 - Campus Universitário CEP 59.072-970 - Natal/RN – Brasil.

Keywords:

Smectite clay, adsorption, textile effluent

Abstract

The main objective of this study was to evaluate Reactive Yellow 4G-BF-200% dye removal process through adsorption on smectite clays in their natural, chemically activated and thermally activated forms. A solution of 20 mg/L of dye was prepared and the mass of smectite clay used was set at 0.2 g smectite for each smectite clay employed. An adsorption kinetics was developed according to a 2² factorial design in which samples containing adsorbent and adsorbate were submitted to finite bath assays in shaker IKA KS 130-WEBER at room temperature (25°C), being conducted at intervals of 0-600 minutes using NaCl P.A, which participates in the process of conduction, fixation the trapping of the dye in the clay pores. The results of 98.05, 86.4 and 95.1% were obtained as removal percentages for natural, chemically and thermally activated smectite clays, respectively. These results showed that chemical and thermal activation were not efficient when compared with results found for natural smectite clay, according to the method used. Based on the kinetic results obtained, it was possible to test the Lagergren’s pseudo-first-order and pseudo-second-order kinetic models, the latter being the most appropriate. The use of smectite clay as adsorbent seems to be an efficient and economically viable method for the treatment of textile effluents.