Sorption and desorption of Cr(VI) ions from water by biochars in different environmental conditions

被引：136
作者：
Tytak, Aleksandra [1 ]
Oleszczuk, Patryk [1 ]
Dobrowolski, Ryszard [2 ]
机构：
[1] Marie Curie Sklodowska Univ, Fac Chem, Dept Environm Chem, PL-20031 Lublin, Poland
[2] Marie Curie Sklodowska Univ, Fac Chem, Dept Analyt Chem & Instrumental Anal, PL-20031 Lublin, Poland
来源：
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH | 2015年 / 22卷 / 08期
关键词：
Sorption; Chromium; Biochar; Environmental conditions; XPS; SEM-EDS; HEXAVALENT CHROMIUM; ACTIVATED CARBONS; AQUEOUS-SOLUTIONS; REMEDIATION; REMOVAL; ADSORPTION; REDUCTION; CHROMATE; WASTES;
D O I：
10.1007/s11356-014-3752-4
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In the present research, the potential of two biochars produced by the thermal decomposition of wheat straw (BCS) and wicker (BCW) for Cr(VI) ions removing from wastewater was investigated. The pH and the presence of chlorides and nitrates were also investigated. The Freundlich and Langmuir models were applied for the characterization of adsorption isotherms. The Langmuir model has better fitting of adsorption isotherms than the Freundlich model. The sorption process can be described by the pseudo second-order equation. The optimal adsorption capacities were obtained at pH 2 and were 24.6 and 23.6 mg/g for BCS and BCW, respectively. X-ray photoelectron spectroscopy (XPS) studies confirmed that Cr(III) ions were the most abundant chromium species on the biochars' surface. The results indicated that the sorption mechanism of Cr(VI) on biochar involves anionic and cationic adsorption combined with Cr(VI) species reduction.
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收藏
页码：5985 / 5994
页数：10
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