研究溶液化学对 Cu(II)在 ZSM-5 沸石上吸附行为的影响。
Investigation of solution chemistry effects on sorption behavior of Cu(II) on ZSM-5 zeolite.
机构信息
School of Chemical Engineering, Shandong University of Technology, Zibo, China.
出版信息
Water Environ Res. 2011 Dec;83(12):2170-7. doi: 10.2175/106143011x12989211841250.
The sorption of Cu(II) from an aqueous solution using ZSM-5 zeolite was investigated by batch technique under ambient conditions. Sorption was investigated as a function of pH, ionic strength, foreign ions, humic substances, and temperature. The results indicate that the sorption of Cu(II) on ZSM-5 zeolite is strongly dependent on pH. Sorption is dependent on ionic strength at low pH, but independent of ionic strength at high pH values. The presence of humic/fluvic acid (HA/FA) enhances the sorption of Cu(II) on ZSM-5 zeolite at low pH values, and reduces Cu(II) sorption at high pH values. Sorption isotherms were well simulated by the Langmuir model. Thermodynamic parameters (i.e., deltaH0, deltaS0 and deltaG0) for the sorption of Cu(II) were determined from temperature-dependent sorption isotherms at 293.15, 313.15, and 333.15 K, respectively. Results indicate that the sorption process of Cu(II) on ZSM-5 zeolite is spontaneous and endothermic.
采用静态批处理法，在环境条件下研究了 ZSM-5 沸石从水溶液中吸附 Cu(II)的情况。考察了 pH 值、离子强度、共存离子、腐殖质和温度对吸附的影响。结果表明，ZSM-5 沸石对 Cu(II)的吸附强烈依赖于 pH 值。在低 pH 值下，吸附依赖于离子强度，但在高 pH 值下，吸附与离子强度无关。在低 pH 值下，腐殖酸/富里酸 (HA/FA) 的存在增强了 Cu(II)在 ZSM-5 沸石上的吸附，而在高 pH 值下，Cu(II)的吸附减少。吸附等温线通过 Langmuir 模型得到了很好的模拟。根据 293.15、313.15 和 333.15 K 时的温度依赖吸附等温线，确定了 Cu(II)吸附的热力学参数（即 deltaH0、deltaS0 和 deltaG0）。结果表明，Cu(II)在 ZSM-5 沸石上的吸附过程是自发的和吸热的。
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