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| Characterization and adsorption performance of phenol on amphoteric modified magnetic bentonites |
| Received:August 15, 2016 |
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| KeyWord:magnetic;bentonite;amphoteric surfactant;phenol;adsorption |
| Author Name | Affiliation | E-mail | | 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 Plant Nutrition and Agro-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | zfmeng1996@263.net | | LIU Wei | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | LI Wen-bin | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China | | | DENG Jing | Library of Northwest A & F University, Yangling 712100, China | |
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| Abstract: |
| In order to solve the problem of bentonite separation from wastewater and to improve adsorption capacity of bentonite on organic pollutants. After prepared magnetic bentonite by the co-precipitation method and then modified by amphoteric surfactant dodecyl dimethyl betaine(BS-12), the study on surface characteristics of amphoteric modified magnetic bentonite(AMMB), such as scanning electron microscopy(SEM), X-ray diffraction(XRD), Fourier transform infrared(FT-IR) etc., and its adsorption ability to phenol under different modification proportions, pH, temperature and ionic strength were carried out. The results showed that magnetic bentonite had higher magnetism and greater surface area than bentonite. With an increase of BS-12 modification proportion, C and N contents and particle size of AMMB increases, but the specific surface area and pore volume decreases. The adsorption amounts of 50BS-MBT, 100BS-MBT and 150BS-MBT were 4.76, 7.78 and 12.04 times higher than that of MBT, respectively. Phenol adsorption on AMMB depends mainly on partition effect due to its linear adsorption isotherm, the adsorption ability increased as temperature and pH dropped, but increased as ionic strength increased. Henry Equation was the optimal description for phenol's adsorption isotherms. The studies demonstrated that the AMMB had high adsorption capacity and can be removed easily compared with raw bentonite. |
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