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| Sorption and desorption of Di-n-butyl phthalate(DBP) on paddy soils and humic acid |
| Received:February 26, 2017 |
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| KeyWord:Di-n-butyl phthalate;the paddy soil;humic acid;sorption;desorption |
| Author Name | Affiliation | E-mail | | WANG Xiao-dan | School of Environment, Jinan University, Guangzhou 510632, China
Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, Guangzhou 510632, China | | | XIANG Lei | School of Environment, Jinan University, Guangzhou 510632, China
Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, Guangzhou 510632, China | | | CHEN Xiao-hong | School of Environment, Jinan University, Guangzhou 510632, China
Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, Guangzhou 510632, China | | | CHEN Xue-bin | School of Environment, Jinan University, Guangzhou 510632, China
Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, Guangzhou 510632, China | | | MO Ce-hui | School of Environment, Jinan University, Guangzhou 510632, China
Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, Guangzhou 510632, China | | | CAI Quan-ying | School of Environment, Jinan University, Guangzhou 510632, China
Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, Guangzhou 510632, China | yqying@126.com |
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| Abstract: |
| In this study, Di-n-butyl phthalate(DBP) was selected as the target contaminant and humic acid was extracted from the paddy soil. The sorption and desorption of DBP(concentrations from 1 to 12 mg·L-1 in solution) on paddy soil and humic acid were investigated by conducting batch sorption experiments. DBP in supernatant was quantified by high efficiency liquid chromatography. The results showed that the sorption of DBP on paddy soil and humic acid reached the equilibrium within 48 h and 24 h, respectively. The sorption kinetics of DBP followed the pseudo-second-order kinetic models with R2>0.997. The sorption of DBP was controlled by the boundary layer diffusion and intra-particle diffusion. The DBP sorption isotherms followed the Freundlich models with R2>0.901 at different temperatures(15, 25, 35 ℃). Thermodynamic data showed that DBP sorption in paddy soils and humic acid was a spontaneous physical sorption process. The DBP sorption capacity of humic acid was higher than that of the paddy soil, which was related to the high soil organic matter content of the former. The DBP desorption isotherms also fitted well the Freundlich models with R2>0.870 at 25 ℃。 Obvious desorption hysteresis was found for paddy soil, but not for humic acid. In other words, the adsorbed DBP was more easily released into the environment on humic acid. |
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