Hydrothermal transformation of mixed metal oxides and silicate anions to phyllosilicate under highly alkaline conditions
Hydrothermal transformation of mixed metal oxides and silicate anions to phyllosilicate under highly alkaline conditions
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高碱性条件下混合金属氧化物和硅酸盐阴离子水热转化为层状硅酸盐
DOI：
10.1016/j.clay.2018.02.013
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发表时间：
2018-05
影响因子：
5.6
通讯作者：
Komarneni Sridhar
中科院分区：
文献类型：
--
作者：
Tao Qi;Chen Manyou;He Hongping;Komarneni Sridhar
Mixed metal oxides (MMO) were transformed to phyllosilicate in the presence of silicate anions under hydrothermal conditions. The product was shown to be saponite with a trioctahedral layer structure by characterization with XRD, FTIR,27Al and29Si MAS NMR, HRTEM and TG-DTG. The formation of saponite was through a rehydration-dissolution-precipitation pathway, involving the critical steps such as the reconstruction of MMO to hydrotalcite (Ht), exsolution of Al3+from Ht, condensation of metasilicate anions with Ht, and finally crystallization of saponite. Isomorphous substitution of Al3+for Si4+in silicate oligomers is the key for the above conversion, which generated the negative charge necessary for the condensation between the silicate oligomers and Ht surface and the formation of 2:1 saponite TOT layers. High pH value (over 14.0) favored the condensation of silicate oligomers and led to crystallization of saponite. Thus, we report a novel method for the crystallization of saponite.
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影响因子：
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作者：
Youwen You;Hongting Zhao;G. Vance
通讯作者：
Youwen You;Hongting Zhao;G. Vance
影响因子：
15
作者：
B. Choudary;N. Chowdari;K. Jyothi;M. Kantam
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B. Choudary;N. Chowdari;K. Jyothi;M. Kantam
影响因子：
2.2
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影响因子：
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通讯作者：
M. Hermosín;I. Pavlović;M. Ulibarri;J. Cornejo
影响因子：
--
作者：
Millange, F;Walton, RI;O'Hare, D
通讯作者：
O'Hare, D