Effects of Al3+ ions on formation of silica framework and surface active sites for SO42- ions
Effects of Al3+ ions on formation of silica framework and surface active sites for SO42- ions
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Al3 离子对二氧化硅骨架形成和 SO42- 离子表面活性位点的影响
DOI：
10.1021/acs.langmuir.6b01940
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发表时间：
2016
期刊：
影响因子：
3.9
通讯作者：
Sumio Ozeki*
中科院分区：
文献类型：
--
作者：
Shigeo Sasahara;Sumio Ozeki*
通过向Al 2（SO 4）3的硫酸水溶液中加入硅酸钠水溶液，在318 K下将Al 3+离子引入二氧化硅骨架中，以形成SO 42-的活性Al位点。在278 K下测量了铝硅酸盐的27 Al和29 Si NMR谱随反应时间的变化，并对29 Si NMR谱进行了多元曲线分辨分析。Al ~（3+）离子的加入促进了凝胶的形成。在硅酸盐聚合反应的早期，少量的Al ~（3+）离子以四配位络合物的形式存在，而在随后的反应中，六配位Al络合物的含量增加，表明四配位和六配位络合物之间发生了可逆的转化。SO 42-离子与铝硅酸盐的正表面相互作用，并特异性地吸附在6-配位的Al 3+物种的表面位点上，其可以作为[Al（H2O）5SO 4]+稳定在硅酸盐表面上。
Al3+ions were introduced into silica framework at 318 K in order to make active Al sites for SO42–by the addition of aqueous sodium silicate solution to aqueous sulfuric acid solution of Al2(SO4)3. The27Al and29Si NMR spectra of aluminosilicates were measured at 278 K with reaction time.29Si NMR spectra were analyzed by the multivariate curve resolution. The addition of Al3+ions to aqueous silicate solution promoted gel formation. Small amounts of Al3+ions were incorporated as a four-coordinated complex at early stage of polymerization reaction of silicates and during subsequent reaction six-coordinated Al complex increased, suggesting reversible conversion between 4- and 6-coordinated complexes. SO42–ions interact with positive surfaces of aluminosilicates and are specifically adsorbed on the surface sites of 6-coordinated Al3+species, which may be stabilized on silicate surfaces as [Al(H2O)5SO4]+.