酸处理后坡缕石的孔结构变化(英文)  

PORE STRUCTURAL CHANGES OF PALYGORSKITE TREATED BY HYDROCHLORIC-ACID

作　　者：王晓峰[1] 熊飞[1] 尹琳[2] 

机构地区：[1]洛阳理工学院材料科学与工程系,河南洛阳471023 [2]南京大学地球科学系,南京210003

出　　处：《硅酸盐学报》2008年第7期1004-1007,共4页Journal of The Chinese Ceramic Society

基　　金：河南省教育厅科技攻关项目(2006430024)

摘　　要：在90℃,坡缕石分别用不同浓度的盐酸处理1.5h,对制得样品的物相、比表面积和微孔结构以及微观形貌进行了研究。结果表明:酸处理可以提高坡缕石的比表面积,改变坡缕石晶体的孔结构,随着酸浓度的改变,坡缕石的总比表面积、微孔比表面积和外比表面积都随之发生改变。当酸浓度小于等于3 mol/L时,坡缕石颗粒聚集体逐步被解离,溶蚀作用主要发生在孔道内,晶体结构能保持相对完整;当酸浓度大于3 mol/L时,部分颗粒被溶蚀掉。结果说明H+能进入到坡缕石的晶体孔道中产生作用,使晶体的孔道不断扩大,孔径最大可以达到0.62～0.75nm,但孔径超过0.62～0.75 nm后晶粒会被破坏。Palygorskite was treated by hydrochloric-acid at different concentrations for 1.5 h at 90℃. The phase composition, the specific surface area, the micropore structure and the micro morphology of the sample were analyzed by X-ray diffraction, automatic surface area analyzer and transmission electronic microscopy. The results show that the specific surface area can be enhanced and the micropore is enlarged after the acid treatment. The surface area in the micropore and the external surface area of the samples vary with the concentration of acid. The aggregate of palygorskite is disassembled at the acid concentration below 3 mol/L. The dissolution mainly occurs in the micro pore and the crystal structure still maintains integrity. Some of the crystallites were destroyed at the acid concentration of above 3 mol/L. H＋ ions can penetrate the micropore, and it can enlarge the micropore with the size range of 0.62-0.75 nm. The crystallites will be destroyed when the aperture is over 0.62-0.75 nm.

关 键 词：酸处理 比表面积 孔径 溶蚀作用 

分 类 号：TU52[建筑科学—建筑技术科学]