硅胶对孔雀石绿的吸附：NaCl、pH 值和异丙醇的影响。
Adsorption of malachite green on silica gel: effects of NaCl, pH and 2-propanol.
机构信息
Department of Chemistry, Faculty of Science, University of Lorestan, 68137-17133, Khoramabad, Iran.
Department of Chemistry, Faculty of Science, University of Lorestan, 68137-17133, Khoramabad, Iran.
出版信息
J Hazard Mater. 2010 Dec 15;184(1-3):739-745. doi: 10.1016/j.jhazmat.2010.08.101.
Adsorption of malachite green (MG) on silica gel was studied as a function of temperature (308-328 K), pH, different concentrations of NaCl and various weight percentages of binary mixtures of 2-propanol with water. It was observed that the adsorption capacity decreases with increase in weight percentage of 2-propanol and NaCl and HCl concentration compared to that of in water. Results showed that in the presence of 2-propanol, surface aggregates of MG form on silica gel due to aggregation of MG molecules in these solutions, reverse desorption occurs. Binding constants of MG to silica gel were calculated using the Langmuir and bilayer isotherms. The process is exothermic in water and endothermic in NaCl solutions. The mean adsorption energy (E) value 9.0-14.2 kJ mol(-1) indicated chemical adsorption.
研究了硅胶对孔雀石绿（MG）的吸附，考察了温度（308-328 K）、pH、不同浓度的 NaCl 和不同重量百分比的 2-丙醇与水的二元混合物等因素对吸附的影响。结果表明，与在水中相比，2-丙醇和 NaCl 的重量百分比以及 HCl 浓度的增加会导致吸附容量降低。结果表明，在 2-丙醇存在下，由于这些溶液中 MG 分子的聚集，MG 在硅胶上形成表面聚集体，从而发生反吸附。使用 Langmuir 和双层等温线计算了 MG 与硅胶的结合常数。该过程在水中是放热的，而在 NaCl 溶液中是吸热的。平均吸附能（E）值为 9.0-14.2 kJ mol(-1)，表明这是化学吸附。
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