Study of chromium(VI) adsorption onto modified activated carbons with respect to analytical application

被引：38

作者：

Dobrowolski, Ryszard ^{[1
]}

Otto, Magdalena ^{[1
]}

机构：

[1] Marie Curie Sklodowska Univ, Fac Chem, Dept Analyt Chem & Instrumental Anal, PL-20031 Lublin, Poland

来源：

ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY | 2010年 / 16卷 / 4-5期

关键词：

Chromium adsorption; Modified activated carbons; Enrichment; Atomic absorption spectrometry; ATOMIC-ABSORPTION SPECTROMETRY; WATER SAMPLES; SPECIATION; SORPTION; PRECONCENTRATION; CR(III); CR(VI); SYSTEM; IONS;

D O I：

10.1007/s10450-010-9240-3

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Two different types of modification of activated carbon, by treatment with concentrated solution of HNO(3) and outgassing treatment at high temperature, were studied in order to obtain the most effective adsorption of chromium(VI) ions from water solution. The basic parameters affecting the adsorption capacity of Cr(VI) ions on modified activated carbons were studied in details and the effect of modifications of activated carbons has been determined by studying the initial runs of adsorption isotherms. The obtained Cr(VI) adsorption isotherms were well fitted in the Freundlich equation. The reduction of Cr(VI) to Cr(III) and further ion exchange mechanism of adsorption onto oxidizing activated carbon and surface precipitation to Cr(OH)(3) in case of outgassing activated carbon were found as the main adsorption mechanisms of Cr(VI) ions onto modified activated carbons. Presence of chlorides and nitrates in studied adsorption system strongly decreased the adsorption ability of Cr(VI) onto outgassing activated carbon and mechanism of this behavior is proposed.

引用

页码：279 / 286

页数：8

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