Sorption-desorption studies on alumina pretreated with acids: II. Oxyanions on HNO3-treated alumina

Surface Technology Pub Date : 1985-12-01 DOI:10.1016/0376-4583(85)90095-0

Ramesh K. Mishra, G.L. Mundhara, V.K. Jain, J.S. Tiwari

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引用次数: 4

Abstract

Sorption-desorption behaviour of three oxyanions (MnO₄⁻, CrO₄^2- 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 CrO₄^2- 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 CrO₄^2- 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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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

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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Surface Technology

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