Adsorption behavior of tungsten (VI) onto activated carbon.

1 January 1983

journal article
Published by Japan Society for Analytical Chemistry in BUNSEKI KAGAKU

Vol. 32 (10) , E313-E319
https://doi.org/10.2116/bunsekikagaku.32.10_e313

Abstract

The adsorption behavior of tungsten(VI) onto activated carbon was studied by using a column method. The result was compared with those of molybdenum(VI), chromium(VI) and other ions. The adsorption of tungsten(VI) shows remarkable pH-dependency, like that of molybdenum(VI) and chromium(VI). The adsorption-pH curves shift toward the higher pH in the following order: HClO₄ 3 < H₂SO₄< HCl. As much as 0.54 g of tungsten(VI) was adsorbed onto 5.0 g of activated carbon at pH 2.0, where the pH value was adjusted by using HNO₃. The amount of tungsten(VI) adsorbed was one half as large as that of molybdenum(VI) and 100 times larger than those of other metal ions such as chromium(VI) and copper(II) under the optimum conditions. Tungsten(VI) may be adsorbed in the forms of polymerized species. The adsorption of tungsten(VI) onto activated carbon was remarkably affected by the addition of 0.2 mol dm^-3 NaX( X = NO₃^-, ClO₄^-, Cl^- and SO₄^2-) solution. The amounts of tungsten (VI) adsorbed increased in the following order: NaClO₄ 3 2SO₄ -3 HNO₃ through the column packed with 5.0 g of activated carbon loaded with 0.41 g of tungsten(VI). The electron microscope photographs of activated carbon and activated carbon loaded with tungsten(VI) are also reported.

Keywords

This publication has 0 references indexed in Scilit: