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| Adsorption of phenol onto red soil modified with a BS-DTAB complex |
| Received:March 05, 2018 |
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| KeyWord:complex modification;red soil;phenol;adsorption |
| Author Name | Affiliation | E-mail | | ZHANG Yang | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | MENG Zhao-fu | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
Key Lab of Nutrition and Agroenvironment in Northwest China, Ministry of Agriculture, Yangling 712100, China | zfmeng1996@263.net | | LI Wen-bin | College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China | | | REN Shuang | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | WANG Teng | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | LIU Wei | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | TIAN Kai | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | |
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| Abstract: |
| To investigate the differences in adsorption of phenol between variable-charge red soil and constant-charge soil after organic complex modification, phenol adsorption via either phenol only or phenol+Cd2+ treatment onto variable-charge red soil modified by a mixture of amphoteric modifier, dodecyl dimethyl betaine(BS-12) and the cationic modifier dodecyltrimethylammonium bromide(DTAB) was tested in a batch experiment. The influence of total modifier ratio(TMR), temperature, ionic strength, and pH on the discrepancies in adsorption were studied. The results showed that phenol adsorption onto amphoteric-modified red soil was enhanced by DTAB and increased with an increase in modifier ratio for phenol only treatment when the TMR was within 150% of the CEC. The Henry equation was the best model for describing the phenol adsorption isotherm, demonstrating that the mechanism of phenol adsorption onto the red soil modified with the BSDTAB complex was controlled by the partition effect. The phenol adsorption decreased with increases in temperature, pH, and ionic strength, while an increase was appeared in phenol+Cd2+ mixture treatment with an increase in ionic strength. The adsorption of phenol onto BSDTAB-modified red soil was a spontaneous physical adsorption process and was lower than that onto constant-charge soil. The low CEC due to the clay mineral composition was the determining factor in controlling phenol adsorption onto the amphoteric-complex-modified red soil. |
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