羟基铁交联累托石的制备及其吸附性能

Preparation and adsorption performance of hydroxy-ferrum cross-linked rectorite

采用氯化铁对累托石进行柱撑改性,研究了最佳改性条件和热力学规律.氯化铁与累托石进行阳离子交换,调节pH,完成羟基化,制备出羟基铁交联累托石.试验得到的最佳条件为:羟基铁交联pH=7,氯化铁用量0.5mmol/g,液固比25∶1,温度60℃,阳离子交换时间6h,羟基铁交联时间3h.在此条件下制备的羟基铁交联累托石对亚甲基蓝的吸附量为163.67mg/g,吸附量较未改性的累托石有了明显的增加.热力学分析表明:改性累托石吸附亚甲基蓝过程的热力学符合Langmuir模式.

Hydroxy-ferrum rectorite was prepared by using FeC13 as the cross-linking agent, and the best modifying conditions and absorption principle of thermodynamics for methylene blue trihydrate were studied. Hydroxyl-ferrum cross-linked rectorite was prepared through regulating pH after cation exchanged between FeCla and rectorite. The best modifying conditions of rectorite were as fellow：the cross-linked pH 7, FeCl3 0.5 mmol/g, the ratio of liquit to solid 25 ： 1, the cross-linked temperature 60℃ ,the cation exchange time 6 h, the pillared time 3 h. The hydroxy-ferrum crossed-linked retorite prepared with the best condition has better adsorption capability than original rectorite, the adsorption quantity for methylene blue trihydrate reaches 163. 67 mg/g. Thermodynamic analysis shows that isothermal adsorption law of hydroxy-ferrum cross-linked rectorite for methylene blue trihydrate accords with Langmuir model.