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| Preparation and Adsorption for Ciprofloxacin of Bentonite Modified by Zwitterionic Surfactant |
| LU Laifu GAO Manglai* YANG Senfeng GU Zheng LIU Yuening |
| (State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum, Beijing 102249) |
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Cite this article:
LU Laifu GAO Manglai* YANG Senfeng GU Zheng LIU Yuening. Preparation and Adsorption for Ciprofloxacin of Bentonite Modified by Zwitterionic Surfactant. Chinese Journal of Materials Research, 2013, 27(6): 576-582.
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Abstract 3-(N, N-dimethylhexadecylammonio) propane sulfonate (HDAPS) was used as modifier for the preparation of organo-betonite, the resulted HDAPS-Bt was characterized by XRD, FT-IR, SEM and BET. The results show that the amphoteric surfactant successfully intercalated into the interlayer of bentonite, and expanded the basal spacing to high extent, the morphology of bentonite was improved and the specific surface area were decreased, while the pore size was enlarged. The adsorption of ciprofloxacin onto HDAPS-Bt modified with different amount of HDAPS was tested, results show that the optimum adsorption ratio was obtained at 0.2 CEC both in acidic and basic solutions. The pH and ionic strength in the solution had great effect on the adsorption of CIP onto raw bentonite, and adsorption capacity decreased dramatically with increasing of pH and ionic strength. However, the organo-bentonite was much easier to disperse in the solution and separate from water than raw bentonite, the adsorption of CIP on HDAPS-Bt was 30% higher than that on Bt, furthermore, pH and ionic strength had less effect on the adsorption of CIP onto HDAPS-Bt in comparison with raw bentonite. The adsorption experiment results show that pseudo-second-order was best for the description of kinetics and the adsorption isotherm was nearly linear.
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