钛柱撑蒙脱石对钴离子的吸附研究

本研究将聚合阳离子Ti4+通过溶胶-凝胶法柱撑插入提纯钠化蒙脱石层间，合成钛柱撑蒙脱石(Ti-pmnt)。X射线衍射分析表明合成材料具有较大的晶面间距(d(001)=2.94 nm)。采用Ti-pmnt合成材料对钴离子进行吸附，研究了pH值、吸附剂用量、温度、吸附时间及初始浓度对Ti-pmnt吸附钴离子的影响。结果表明：最佳吸附pH值为4，吸附平衡时间为120 min，去除率达到99.97%，饱和吸附量为41.94 mg/g，且升温不利于吸附反应进行。Ti-pmnt对钴离子吸附动力学遵循拟二级动力学方程，吸附等温线符合Langmuir等温模型。

Study on Adsorption of Cobalt Ions from Titanium Pillared Montmorillonite

This study was to synthesize titanium pillared montmorillonite (Ti-pmnt) by polymeric cations Ti4+ into the interlayer spaces of the puriifed Na-montmorillonite with sol-gel method. The composites with a larger basal spacing (d(001)=2.94 nm) was characterized by X-ray diffraction analysis. Adsorption characteristics of Ti-pmnt were examined by cobalt ion as an adsorbate. The effects of solution pH value, adsorbent dosage, temperature, adsorption time and initial concentration of the Ti-pmnt adsorption of cobalt ions were investigated. The results showed that the better adsorption pH value was 4, adsorption equilibrium time was 120 min, the removal rate was 99.97%, adsorption capacity of 41.94 mg/g and the higher temperature was not beneifcial to the adsorption reaction. Adsorption kinetics followed the pseudo-second-order equation, adsorption isotherm data ift well with the Langmuir isotherm model.