洗剂液性质对皂石铝柱柱撑效果的影响

Influence of Detergent on Preparation of Al Pillared Saponite

采用水热法制备了Na型皂石,用去离子水、酸溶液、铵溶液和盐溶液分别对皂石样品进行洗涤,然后不经干燥直接进行铝柱交联柱撑制备了一系列层柱皂石样品,研究了洗涤剂对柱皂石样品的物相和元素组成、孔结构、比表面积及干基回收率的影响。结果表明:单纯去离子水洗涤的皂石样品干基回收率低(小于80%),碱性物种残留高,高碱度环境对柱撑剂中铝-氧基团的结构具有破坏作用,导致铝柱撑效率低;用酸、铵、盐溶液洗涤皂石干基回收率达100%,碱性物种残留低,铝柱柱撑效率高,其中酸洗法得到的层柱皂石样品,其比表面积最高达到346 m^2/g,Na_2O残留量最低为0.03%。

Na-type saponite was synthesized by a hydrothermal method and the saponite samples were washed by deionized water, acid solution, ammonium solution and salt solution, respectively, to obtain Al-pillared saponite. Effect of detergent on the phase and element composition, pore structure, specific surface area and the recovery of Al-pillared saponite samples was investigated. The results show that the alkali species on saponite are removed through simply washing by deionized water and the recovery of saponite is only 80%, and the high pH value is harmful to the structure of Al-O group, causing a lower efficiency orAl pillaring. The recovery rate of saponite washed by acid solution, ammonium solution and salt solution is 100 %. The Al-pillared saponite washed by acid solution has a greater specific surface area of 348 m2/g and Na20 residual amount is only 0.03%.