通过静态pH影响、等温线和动力学实验,研究了Cu(Ⅱ)/Ca(Ⅱ)共存对亚氨基二乙酸树脂IRC748吸附四环素(TC)的影响规律.研究结果表明,广泛的pH(2-8)范围内,共存的Cu(Ⅱ)显著促进了IRC748对TC的吸附,而共存的Ca(Ⅱ)会抑制其吸附.TC对Cu(Ⅱ)/Ca(Ⅱ)的吸附影响较小.TC吸附在不同体系中均符合Frendlich模型,亲和力参数Kf随共存Cu(Ⅱ)浓度的增大而增大(约33％),随共存Ca(Ⅱ)浓度的增大而降低(约15％).不同体系中TC吸附动力学均较符合拟二级动力学方程,含Cu(Ⅱ)体系中TC与Cu(Ⅱ)的吸附进程一致.UV-Vis、FTIR、XPS和Cu(Ⅱ)预负载证明了液相中仅Cu(Ⅱ)与TC发生强烈络合,TC因[Cu-TC]络合物吸附(Route Ⅰ)或Cu(Ⅱ)位点的桥联吸附作用(RouteⅡ)在IRC748上得到增强去除;Ca(Ⅱ)会与TC竞争相同的吸附位点(羧基)而降低TC的吸附.
Effect of co-existing Cu(Ⅱ)/Ca(Ⅱ) on the adsorption of tetracycline (TC) onto an iminodiacetic acid resin (IRC-748) was investigated by equilibrium and kinetic studies.Under a wide range of pH (2-8),the presence of Cu (Ⅱ) markedly enhanced the adsorption of TC,while TC uptake was suppressed when Ca(Ⅱ) was present.The adsorption of Cu(Ⅱ)/Ca(Ⅱ) was not influenced by TC.The adsorption isotherm of TC were well fitted by Freundlich model.With the increase of initial metal concentrations,Kf values of TC increased by 33％ for Cu(Ⅱ)-TC systems but decreased by 15％ for Ca(Ⅱ)-TC systems,comparing with TC alone.The kinetic data of TC adsorption in various systems were all well fitted by pseudo-second-order kinetic model.TC and Cu (Ⅱ) adsorption occured synchronously in Cu(Ⅱ)-TC systems.Furthermore,UV-Vis,FT-IR and XPS characterizations as well as Cu(lⅡ)/Ca(Ⅱ) preloading tests demonstrated that only Cu(Ⅱ) complexed with TC,and the enhancement of TC adsorption resulted from either the direct adsorption of [Cu-TC] complex or the bridge effect of Cu-sites in solid phase.Contrarily,Ca(Ⅱ) and TC competed for the same carboxyl sites,leading to the decrease of TC uptake in Ca(Ⅱ)-TC systems.
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