Cu(Ⅱ)、Ca(Ⅱ)共存对IRC748树脂吸附四环素的影响与机制
Effect of co-existing Cu(Ⅱ)/Ca(Ⅱ) on the adsorption of tetracycline onto IRC748 resin
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摘要: 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(Route Ⅱ)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.Abstract: 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(Ⅱ)/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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Key words:
- adsorption /
- tetracycline /
- iminodiacetic acid resin /
- Cu(Ⅱ) /
- Ca(Ⅱ)
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