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| Enhancing effect of gemini surfactant complex modification on Cr(VI) adsorption by amphoteric bentonite |
| HU Xiao-long1, MENG Zhao-fu1,2, WANG Xin-xin1, Liu Xin1, SUN Xiu-xian1, REN Shuang1, WANG Teng1, ZHANG Ling-kai1, BU Shuai-bin1, ZHANG Meng-fei1 |
1. College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China;
2. Key Laboratory of Plant Nutrition and Agro-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China |
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Abstract A series of amphoteric-cationic complex modified bentonites were prepared with amphoteric modifier dodecyldimethyl betaine(BS) and gemini cationic surfactant ethylene ditetradecyl dimethyl ammonium chloride(EB), Cr(VI) adsorption on BS+EB complex modified bentonite under different modification ratio, temperature, pH and ionic strength and its thermodynamic characteristics were studied by batch method, its adsorption mechanism was discussed by comparing surface charge and infrared spectrum of BS+EB complex modified bentonite before and after Cr(VI) adsorption. The results showed that EB complex modification significantly enhanced its adsorption capacity for Cr(VI), which was 2.02~27.25 times higher than that on BS amphoteric modified bentonite. The Cr(VI) adsorption increased with an increase of EB modification ratio at 30℃ and was ordered by BS+150EB(BS and 150% EB complex modified bentonite) > BS+100EB > BS+50EB > BS+25EB > BS > CK(bentonite). The Cr(VI) adsorption on both CK and BS modified bentonite was a spontaneous process with a characteristics of both enthalpy-increase and entropy-increase, except it on BS+EB complex modified bentonite decreased with an increase of temperature, showing a characteristics of negative temperature effect. With an increase of pH and ionic strength, the adsorption of Cr(VI) on each sample decreased gradually. The results of infrared spectra and soil surface charge confirmed that charge attraction was the main mechanism for Cr(VI) adsorption on BS+EB complex modified bentonite.
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Received: 16 October 2019
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