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Zhang Y.,Nanjing Normal University | Zhang Y.,Jiangsu Key Laboratory of Material Cycle and Pollution Control | Zhang Y.,Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application | Wang F.,Nanjing Normal University | And 11 more authors.
Chinese Journal of Environmental Engineering | Year: 2015

The adsorption characteristics and its adsorption kinetics of ciprofloxacin (CIP) and norfloxacin (NOR) on montmorillonite and diatomite were studied at different oscillating times, solution pH, and concentrations of metal ions. The results indicate that adsorption for CIP and NOR reached equilibrium when adsorption time was 4 h. Strong acidic and strong alkaline are conducive to the adsorption of CIP by montmorillonite. Neutral and alkaline are not conducive to the adsorption of NOR on montmorillonite. The adsorptive quantity of CIP on diatomite decreased when increased pH value. Strong acidic and strong alkaline are conducive to the adsorption of NOR on diatomite. Na+ and K+ have no effects on the adsorption of CIP and NOR when pH≤6. The removal efficiency of CIP and NOR by the adsorbents used was reduced significantly when pH was 10. Ni2+ was conducive to the adsorption of CIP by montmorillonite, but adverse to NOR, and Ni2+ decreased the adsorption of CIP and NOR on diatomite under neutral condition. The analysis of CIP and NOR's adsorption dynamics on clay used shows that the pseudo-second-order model fits the adsorption behavior well. ©, 2015, Science Press. All right reserved. Source

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