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Removal of bentazone from micro-polluted water using miex resin:Kinetics,equilibrium,and mechanism

Journal of Environmental Sciences 2011年第3期23卷 381-387页

作者： Zequn Liu Xiaomin Yan Mary Drikas Danong Zhou DongshengWang Min Yang Jiuhui Qu State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 Australian Water Quality Center South Australia Water Corporation Victoria Square 250 Adelaide SA 5000 Australia No.9 Water Plant Beijing Waterworks Group Beijing 100192 China

The contamination of surface and ground water by bentazone has attracted increasing global concern in recent years. We conducted a detailed investigation using miex resin to eliminate bentazone from waters. Batch experiments were carried out to evaluate the effect of process parameters, such as retention time, resin amount, and initial pesticide concentration, on removal efficiency of bentazone. Results showed the sorption process was fast and bentazone could be efficiently removed in 30 minutes. The kinetic process of bentazone sorption on miex resin was well described by pseudo second-order model and intraparticle diffusion was the rate controlling step. The miex resin possessed the highest sorption capacity of 0.2656 mmol/mL for bentazone according to Langmuir fitting, Bentazone is a hydrophobic ionizable organic compound, and both ionic charge and hydrophobic aromatic structure governed the sorption characteristics on miex resin. The different removal efficiencies of ionic and non-ionic pesticides, combined with the charge balance equations of bentazone, SO4^2-, NO3- and Cl-, indicated that removal of bentazone using miex resin occurred primarily via ion exchange.

关键词： bentazone miex resin ion exchange micro-polluted water

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Adsorptive removal of antibiotics from water using magneticion exchange resin

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Journal of Environmental Sciences 2017年第2期29卷 111-117页

作者： Tianyue Wang Xun Pan Weiwei Ben Jianbing Wang Pin Hou Zhimin Qiang Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Enuironmental SciencesChinese Academy of SciencesBeijing 100085China School of Chemical and Enuironmental Engineering Beijing CampusChina University of Mining and TechnologyBeijing 100083China Foreign Economic Cooperation Office Ministry of Environmental ProtectionBeijing 100035China

The occurrence of antibiotics in the environment has recently raised serious concern regarding their potential threat to aquatic ecosystem and human health. In this study, the magnetic ion exchange（miex） resin was applied for removing three commonly-used antibiotics, sulfamethoxazole（SMX）, tetracycline（TCN） and amoxicillin（AMX） from water.The results of batch experiments show that the maximum adsorption capacities on the miex resin for SMX, TCN and AMX were 789.32, 443.18 and 155.15 μg/m L at 25°C,respectively, which were 2–7 times that for the powdered activated carbon. The adsorption kinetics of antibiotics on the miex resin could be simulated by the pseudo-second-order model（R^2= 0.99）, and the adsorption isotherm data were well described by the Langmuir model（R^2= 0.97）. Solution p H exhibited a remarkable impact on the adsorption process and the absorbed concentrations of the tested antibiotics were obtained around the neutral p H.The miex resin could be easily regenerated by 2 mol/L Na Cl solution and maintained high adsorption removal for the tested antibiotics after regeneration. Anion exchange mechanism mainly controlled the adsorption of antibiotic and the formation of hydrogen binding between the antibiotic and resin can also result in the increase of adsorption capacity. The high adsorption capacity, fast adsorption rate and prominent reusability make the miex resin a potential adsorbent in the application for removing antibiotics from water.

关键词： Sulfamethoxazole Tetracycline Amoxicillin Antibiotics miex resin Adsorption

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