Adsorption Study for Removal of Basic Red Dye Using Bentonite

Abstract

Colored wastewater poses a challenge to the conventional wastewater treatment techniques. Solid−liquid phase adsorption has been found to be effective for the removal of dyes from effluent. In this paper, the ability of bentonite as an adsorbent for the removal of a commercial dye, Basic Red 2 (BR2), from an aqueous solution has been investigated under various experimental conditions. The adsorption kinetics was shown to be pseudo-second-order. It was found that bentonite had high adsorption capacity for BR2 due to cation exchange. The adsorption equilibrium data can be fitted well by the Langmuir adsorption isotherm model. The effect of the experimental parameters, such as temperature, salt, and pH was investigated through a number of batch adsorption experiments. It was found that the removal of dye increased with the increase in solution pH. However, the change of temperature (15−45 °C) and the addition of sodium chloride were found to have little effect on the adsorption process. The results show that electrostatic interactions are not dominant in the interaction between BR2 and bentonite. It was found that the adsorption was a rapid process with 80−90% of the dye removed within the first 2−3 min. Bentonite as an adsorbent is promising for color removal from wastewater.

Adsorption of Methylene Blue from Aqueous Solution Using Steam-Activated Carbon Produced from <i>Lantana camara</i> Stem

“…In order to investigate the mechanism of adsorption and potential rate controlling steps such as mass transfer and chemical reaction, the kinetics of MB sorption onto SALC was investigated using two different models: the pseudo-first-order kinetic [42], and the pseudo-second-order kinetic [43] models. The conformity between experimental data and the model predicted values was expressed by the correlation coefficients (R 2 , values close or equal to 1 and SSE = sum of square of errors) [41].…”

Caracterização de argilas bentonitas e diatomitas e sua aplicação como adsorventes

“…[1][2][3][4][5][6][7] Estes minerais são filossilicatos hidratados que, devido ao fenômeno de substituição isomórfica na sua estrutura cristalina lamelar, por exemplo, de Si +4 por Al +3 , apresentam cátions trocá-veis entre as lâminas e por isto possuem alta capacidade de troca catiônica (CTC). 8 Bentonitas 7 são argilas do grupo das montmorillonitas, que possuem como cátions de compensação Na + e Ca +2 .…”

Adsorption From Aqueous Solution Onto Natural and Acid Activated Bentonite

“…The weak influence of temperature for the adsorption of MB probably indicated the low activation energy in the predominantly ionic system (Hu et al, 2006).…”

“…This depresses its large scale usage. In order to overcome this deficiency, many researchers investigated the development and preparation of low cost alternative adsorbents such as wood (Poots et al, 1978), dead and pretreated (A. niger) fungus (Fu and Viraraghavan, 2000;2001a;2001b;2002a;2002b), zeolite (Armagan et al, 2004;Wang et al, 2006), Tripoli (ALzaydien, 2009) and bentonite (Ozcan and Ozcan, 2004;Hu et al, 2006).…”