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| Characterization of different adsorption mechanisms of phenol and phenanthrene with BS/DTAB modified bentonite |
| Received:December 14, 2017 |
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| KeyWord:combined modified;bentonite;phenol;phenanthrene;surface characteristics |
| Author Name | Affiliation | E-mail | | WANG Teng | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | XIE Ting | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | REN Shuang | 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 | | TIAN Kai | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | ZHANG Yang | 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
Department of Chemical and Environmental Engineering, Xinjiang Institute of Engineering, Urumqi 830091, China | | | LI Wen-bin | College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China | |
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| Abstract: |
| This paper investigates the association between the combined modified ratio, surface characteristics, and adsorption of organic pollutants on modified bentonite, modified by amphoteric modifier, dodecyl dimethyl betaine(BS-12), and cationic modifier, Dodecyltrimethylammonium Bromide(DTAB). Total carbon content, specific surface area(SBET), X-ray diffraction(XRD), infrared spectroscopy(FTIR)and scanning electron microscopy(SEM)were studied to determine the determinants of phenol and phenanthrene adsorption on BS/DTAB combined modified bentonites. Results showed that the DTAB on the surface of BS-12 amphoteric bentonite was confirmed by the FTIR and SEM. With the increase of the total modification ratio(TMR), adsorption of phenol and phenanthrene increased, and the adsorption began to decrease after the TMR exceeded 150% CEC. Change of the total carbon content and layer spacing(d001)of combined modified bentonites were proportional to the TMR, the change of SBET was inversely proportional to the TMR, and the variation range is increased after the TMR exceeded 150% CEC. Results of correlation analysis showed that the adsorption of phenol and phenanthrene to the bentonite was determined by the total carbon content, the sorption of phenol on the bentonite were of the mode of partitioning, while the sorption of phenanthrene of the mode of partitioning and surface adsorption. |
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