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首页> 外文期刊>日本土壤肥料学雑誌 >Change in surface properties of allophane and imogolite by fluoride ion treatment - increase in surface acid strength and cation exchange capacity following treatment and their molecular orbital analyses
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Change in surface properties of allophane and imogolite by fluoride ion treatment - increase in surface acid strength and cation exchange capacity following treatment and their molecular orbital analyses

机译:通过氟离子处理改变致氟离子处理的表面性质 - 表面酸强度和治疗后的阳离子交换能力的增加及其分子轨道分析

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摘要

Allophane and imogolite were respectively separated from the inner part and outer part of weathered pumice grains. These materials were treated with NH4F solution. Surface acid strength and cation exchange capacity (CEC) were measured before and after the treatment. The measured values of CEC increased with the increasing concentration of NH4F solution. The maximum values of the treated materials were 3 to 4.5 times higher for allophane and 22 times higher for imogolite than those of their untreated counterparts. The surface acidity measured by the Hammett indicator method was much stronger for allophane and imogolite treated with NH4F solution than for those without treatment. The mechanism of the changes in CEC and surface acidity analysed by infrared spectroscopy and molecular orbital method were as follows: silanol groups (Si-OH) in the structures of allophane and imogolite interact at the electron level with fluorine taken into the structures. This interaction facilitates the dissociation ofprotons from the silanol groups, causing the enhancement of CEC and a strengthening of the acidity.
机译:血际烷和Imogogite分别与风化的浮石颗粒的内部和外部分开。用NH 4 F溶液处理这些材料。在治疗前后测量表面酸强度和阳离子交换能力(CEC)。 CEC的测量值随着NH 4 F溶液的浓度的增加而增加。对于艾菲烷的处理材料的最大值为3至4.5倍,而不是其未处理的对应物的ImoGoLite的22倍。通过HAMMETT指示剂方法测量的表面酸度对于用NH 4 F溶液处理而不是没有处理的那些溶液的偏爱噻吩和ImoGoLite更强。通过红外光谱和分子轨道分析分析的CEC和表面酸度的变化的机理如下:硅甲基(Si-OH)中的硅甲烷和ImoGogite的结构,用氟取为结构。该相互作用促进了从硅烷醇基团的戊酮的解离,从而引起CEC的增强和酸度的强化。

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