YANG Cheng-liang1, HE Xian-ju2, GUAN Jun-fang1*, LI Yin1, ZHENG Jia-min1, GUO Zheng-zheng1
(1. School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China;
2. Zhengye Longteng New Material Development Co, Ltd, Guiyang 550005, China)
Abstract: The sodium- and calcium-based two kinds of the Xiazijie bentonites are used as adsorbents to treat Basic Red 46 and Basic Blue 41 in the dye wastewater. By changing the adsorption time, adsorbent dosage, dyesolution concentration, and initial pH value of the solution, the effects of the sodium- and calcium-based Xiazijie bentonites on the decolorization rates of Basic Red 46 and Basic Blue 41 has been analyzed in this paper. The adsorption kinetics, adsorption thermodynamics, and adsorption mechanism of Basic Red 46 and Basic Blue 41 in the dye wastewater by those bentonites have also been studied. The results show that there are certain differences in the optimal decolorization conditions for the treatment of two kinds of basic dye wastewaters by using the two kinds of bentonites. the quasi-first-order kinetic model has more accurately described the adsorption process of basic dye wastewaters by bentonites. The adsorption of Basic Red 46 by bentonite is a spontaneous endothermic reaction, whereas the adsorption of Basic Blue 41 is a spontaneous exothermic reaction. The adsorption of two kinds of basic dye wastewaters by bentonites has both physical adsorption and ion exchange adsorption.
Keywords: Bentonite; basic dye; adsorption mechanism; thermodynamics; kinetics
ACTA MINERALOGICA SINICA Vol. 41, No.2, 2021, page 190-196
