酸预处理氧化铝的吸附-解吸研究II。hno3处理氧化铝上的氧阴离子

Ramesh K. Mishra, G.L. Mundhara, V.K. Jain, J.S. Tiwari
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引用次数: 4

摘要

研究了三种氧化离子(MnO4−,CrO42−和VO3−)在HNO3预处理的色谱氧化铝上的吸附-解吸行为。吸附与pH值有关,在表面pH值为3.5 (MnO4−)、2.5 (VO3−)和2.0 (CrO42−)时吸附量最大。当表面pH值大于等于5.5时,MnO4-和CrO42-的亲和力几乎可以忽略不计。而在pH 5.0 ~ 8.8范围内,VO3-对底物表现出亲和力。单价阴离子似乎被吸附,主要是通过静电作用与酸处理产生的表面位置。CrO42-似乎涉及离子交换和弱化学相互作用。用无机电解质作为洗脱剂,用柱色谱法分离了氧阴离子的混合物(二元和三元)。
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Sorption-desorption studies on alumina pretreated with acids: II. Oxyanions on HNO3-treated alumina

Sorption-desorption behaviour of three oxyanions (MnO4, CrO42- and VO3) on chromatographic alumina pretreated with HNO3 is described. The sorption is found to be pH dependent, and has maxima at surface pH values of 3.5 (MnO4), 2.5 (VO3) and 2.0 (CrO42−). The affinity of MnO4- and CrO42- is almost negligible at surface pH values of 5.5 or more. However, VO3- shows affinity for the substrate in the pH range 5.0 - 8.8. The monovalent anion appears to be sorbed, primarily via electrostatic interaction with the surface sites created by the acid treatment. The CrO42- appears to involve ion exchange and weak chemical interactions. Mixtures of the oxyanions have been separated (binary and ternary) by column chromatography using inorganic electrolytes as eluents.

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