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利用TEM,XRD研究了热液型和沉积型凹凸棒石与酸作用过程中产物、结构变化。结果表明:随着酸浓度增加,凹凸棒石与酸反应时间延长,凹凸棒石中八面体阳离子溶解增加,并在溶解的同时,四面体硅部分分解成硅酸或聚硅酸溶胶,部分四面体硅保持凹凸棒石纳米针状晶体形态假象,直至八面体阳离子完全溶解。八面体阳离子部分溶解并不破坏凹凸棒石的晶体结构,当八面体阳离子基本完全溶解时,凹凸棒石晶体转变为纳米棒状无定形活性SiO2。比较而言,热液型凹凸棒石比沉积型凹凸棒石更耐酸,除热液型凹凸棒石的晶体直径比沉积型凹凸棒石的晶体直径大之外,可能与热液型凹凸棒石八面体的有序度高有关。实验结果证实:酸处理后的凹凸棒石在镁盐溶液中没有发生成分和结构的恢复。
Abstract：The products and structural changes of the reaction between palygorskite and acid were investigated with TEM and XRD. The results indicate that dissolution of octahedral cations of palygorskite increases with the increasing of acid concentra-tion and reacting time. Tetrahedral silicon inside of palygorskite is partly decomposed into silicic acid and/or poly-silicic acid in the solution while octahedral cations are dissolved, and partly aggregated in the filtrate. Part of tetrahedral silicon keeps the pseudo-morphology until acid hydrolysis. After palygorksite reaction is completed (octahedral cations are dissolved completely), the final product is mesoporouse amorphous silica-fiber. Comparing to sedimentary genesis palygorskite, hydrothermal genesis palygorskite is more anti-acid, which is related to the mineralogical property such as crystallinity and ordering of Mg and AI in octahedron of palygorskite. Experiment results show that composition and crystal structure of palygorskite treated with acid cannot be recovered in magnesium solution.
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基本信息:
中图分类号:P578
引用信息:
[1]陈天虎,冯有亮,史晓莉.凹凸棒石与酸反应产物和结构演化的研究[J].硅酸盐学报,2003(10):959-964.
基金信息:
国家自然科学基金(40072017)
2003-10-26
2003-10-26