焙烧类水滑石吸附去除水中苯酚

用液相共沉淀法制备镁铝铁类水滑石．在500℃下焙烧，类水滑石转化为镁铝铁复合氧化物．用XRD、TG/DTA、比表面仪和FTIR对类水滑石和镁铝铁复合氧化物进行表征分析．以镁铝铁复合氧化物为吸附剂吸附水中的苯酚．对实验条件和主要影响因素进行研究，并对吸附处理机理进行探讨．实验结果表明：镁铝铁复合氧化物可有效去除水中的苯酚．去除苯酚的实验数据符合Langmuir吸附等温线．吸附动力学过程遵守Lagergren一级速率方程．镁铝铁复合氧化物可重新吸收阴离子恢复原有的层状结构．

Adsorption removal of phenol from aqueous solution by calcined hydrotalcite-like compounds

A Mg-Al-Fe hydrotalcite-like compound was prepared by the coprecipitation method. the hydrotalcite-like compound was transformed into the Mg-Al-Fe-O mixed oxide type by being calcined at 500℃. The hydrotalcite-like compound and Mg-Al-Fe-O mixed oxide were characterized by XRD, TG/DTA, BET surface area and FTIR respectively. The adsorption removal of phenol from aqueous solution by the Mg-Al-Fe-O mixed oxide was investigated. The experimental conditions and the effect factors were studied, and the adsorption mechanism was discussed. The results show that calcined hydrotalcite is particularly effective at removing phenol from aqueous solutions. The experimental data of phenol removal fits nicely with the Langmuir isotherm. The adsorption of phenol by HTLCs-500 follows first-order kinetics. The anion intercalation leads to the recovery of the Mg-Al-Fe-O mixed oxide.