Effect of amphoteric-anionic surfactant combined modification on Cd2+ adsorption of yellow brown soil
LIU Wei1,2, ZHANG Yang1, MENG Zhao-fu1,3, LI Wen-bin4, REN Shuang1
1. Department of Natural Resource and Environment, Northwest Agriculture and Forestry University, Yangling 712100, China; 2. Department of Chemical and Environmental Engineering, Xinjiang Institute of Engineering, Urumqi 830091, China; 3. Key Laboratory of Plant Nutrition and Agri-Environment in Northwest China, Ministry of Agriculture, Northwest Agriculture and Forestry University, Yangling 712100, China; 4. College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China
Abstract:In order to explore the application of Cd2+ adsorption on yellow brown soils with the best modification ratio of adsorption of Cd2+ on bentonites, we prepared two series of yellow brown soils, modified by dodecyl dimethyl betaine (BS-12) and sodium dodecyl sulfonate (SDS), respectively. The structures of soils were characterized by X-ray diffraction and organic carbon contents. The adsorption properties and influence factors, such as ionic strength, pH and temperature were investigated. Furthermore, we also assessed the differences in Cd2+ adsorption between bentonites and two modified yellow brown soils. Compared with unmodified soils, the interlayer spacing in modified soils was not significantly changed and the total organic carbon content increased with increment of the total modification. Similar with bentonites, the adsorption of Cd2+ on co-modified yellow brown soils was stronger than that of BS modified soils and non-modified soils. At 30oC, the adsorption capacity was 215BS + 322SDS (215%BS-12 + 322%SDS) > 215BS (215%BS-12) > CK1 (soil containing montmorillonite content of 43%) and 33BS + 49SDS (33%BS-12 + 49%SDS) > 33BS (33%BS-12) > CK2 (soil containing montmorillonite content of 6%). In addition, the desorption of Cd2+ on co-modified yellow brown soils was higher than CK and BS modified yellow brown soils. Langmuir equation was suitable to describe the adsorption of Cd2+ on yellow brown soil. Cd2+ could be effectively adsorbed by yellow brown soils with the best modification ratio of bentonites. The adsorption of modified yellow brown soils decreased with ionic strength rising. pH had little influence on Cd2+ adsorption. Similar with modified bentonites, the temperature effect changed from positive on CK and amphoteric soils to negative on BS+SDS soils after SDS modified. CEC contributed most to the adsorption difference of Cd2+.
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