水中硝基苯在柱撑膨润土上的吸附行为

ADSORPTION OF NITROBENZENE FROM AQUEOUS SOLUTION BY INORGANO-ORGANO-MONTMORILLONITES

在 [OH-]/ [Al3 + ]=2 4的反应条件下 ,利用Al3 + 与碱液反应制备出Keggin离子 ,并由此制备出了无机、无机 有机柱撑膨润土 ,XRD 衍射数据表明 ,经柱撑后的膨润土层间距明显增大 ,达 1 9nm以上 .研究了硝基苯在 4种改性膨润土上的吸附行为 ,结果表明 :经柱撑处理后的膨润土吸附能力明显大于钠基土 ,其吸附动力学行为遵循Bingham方程和Langmuir方程所描述的规律 ,平衡吸附量 qe 与平衡浓度Ce 之间的关系符合Freundlich和Langmuir等温吸附方程 ,吸附表现为放热的物理吸附和有机质的分配作用 .

Inorgano-organo-montmorillonites were obtained by using Keggin ion which prepared by reaction of Al3+ and alkaline solution at the molar ratio of OH-/Al3+ = 2.4. It was shown by XRD analysis that the dimension of the pillared interlayer montmorillonites obtained was increased to 1.9 nm and over. The adsorption of nitrobenzene on four modified montmorillonites was also studied and the results indicate that the adsorption capacities of inorgano-organo-montmorillonites were much better than those of Na-montmorillonites. The adsorption dynamics follows the laws of Bingham and Langmuir equation. The relation between adsorbtive capacity (qe) and equilibrium concentration (Ce) fits the isothermal adsorption equations of Freundlich and Langmuir. The adsorption could be interpreted as exothermic physical adsorption and organic compound partition.