The characteristics of norfloxacin adsorption on mangrove sediment of Guangxi provinece
LAI Jun-xiang1,2, JIANG Fa-jun1,2, WANG Yi-bing1,2, XU Ming-ben1,2, ZHANG Rong-can1,2, LEI Fu1,2
1. Guangxi Key Laboratory of Marine Environmental Science, Guangxi Academy of Sciences, Nanning 530007, China;
2. Guangxi Beibu Gulf Marine Research Center, Nanning 530007, China
Abstract：Batch equilibrium experiments were conducted to study the adsorption characteristics of norfloxacin on mangrove sediment collected from Guangxi.The effects of experimental parameters such as pH, salinity and surfactants on the sorption of norfloxacin were inveatigated.The results showed that the sorption of norfloxacin to the mangrove sediment is a two-step process that includes a rapid sorption step and then a slow sorption one.Equilibrium modeling for the sorption data is nonlinear, and both the Freundlich isotherm and Langmuir isotherm fit well to the sorption data.With the increasing of pH values, the equilibrium uptake capacity of norfloxacin increased at first and then decreased.The adsorption capacities of norfloxacin on sediment decreased as salinity of solutions were increasing.At the same concentration (5 mg·L-1), the promotion effect of three surfactants on the adsorption ability of norfloxacin on the mangrove sediment followed the sequence of Tween20 < SDBS < CTAB.
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