Effect of pH, ionic strength and temperature on sorption of Pb(II) on NKF-6 zeolite studied by batch technique
Effect of pH, ionic strength and temperature on sorption of Pb(II) on NKF-6 zeolite studied by batch technique
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间歇技术研究 pH、离子强度和温度对 NKF-6 沸石吸附 Pb(II) 的影响
DOI：
10.1016/j.cej.2010.12.039
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发表时间：
2011-03
影响因子：
15.1
通讯作者：
Wang, Xiangke
中科院分区：
文献类型：
--
作者：
Yang, Xin;Yang, Shubing;Yang, Shitong;Hu, Jun;Tan, Xiaoli;Wang, Xiangke
采用间歇吸附法研究了pH、离子强度、固液比、接触时间和温度对NKF-6沸石吸附Pb（II）的影响。采用XRD和FTIR对NKF-6分子筛进行了表征。结果表明，Pb（II）在NKF-6分子筛上的吸附受pH值的强烈影响，pH<6时，吸附受离子强度的影响，pH>6时，吸附不受离子强度的影响。Pb（II）的吸附在低pH值时主要通过离子交换或外球表面络合作用进行，在高pH值时主要通过内球表面络合作用进行。由吸附等温线计算的热力学参数（Δ H 0、Δ S 0和Δ G 0）表明，Pb（II）在NKF-6分子筛上的吸附是吸热的自发过程。研究结果对理解水溶液中Pb（II）与沸石的相互作用具有重要意义。本研究表明，NKF-6沸石可以作为一个合适的吸附剂的预富集和固化的铅（II）从大体积的水溶液。
The effect of pH, ionic strength, solid/liquid ratio, contact time and temperature on sorption of Pb(II) to NKF-6 zeolite is investigated using batch technique under ambient conditions. The NKF-6 zeolite is characterized using XRD and FTIR. The sorption results indicate that the sorption of Pb(II) on NKF-6 zeolite is strongly dependent on pH. The sorption of Pb(II) is affected by ionic strength at pH<6, while it is independent of ionic strength at pH>6. The sorption of Pb(II) is dominated by ion exchange or outer-sphere surface complexation at low pH values, and by inner-sphere surface complexation at high pH values. The thermodynamic parameters (ΔH0, ΔS0and ΔG0) calculated from the temperature dependent sorption isotherms suggest that the sorption of Pb(II) on NKF-6 zeolite is endothermic and spontaneous process. The results are quite important to understand the interaction of Pb(II) with zeolite in aqueous solutions. This investigation shows that the NKF-6 zeolite can be used as a suitable adsorbent for the preconcentration and solidification of Pb(II) from large volumes of aqueous solutions.
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