Preparation of new CaFeAI-layered doubled hydroxides adsorbent for Cr(Ⅵ) adsorption from polyaluminum chloride residue

Xiaogang Han; Xin Meng; Tingchao YangMing WeiXiaohang Zhang

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Preparation of new CaFeAI-layered doubled hydroxides adsorbent for Cr(Ⅵ) adsorption from polyaluminum chloride residue

机译：Preparation of new CaFeAI-layered doubled hydroxides adsorbent for Cr(Ⅵ) adsorption from polyaluminum chloride residue

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In the two-step production of polyaluminum chloride, the insoluble solid in raw material will become waste residue. The landfill could cause pollution of non-point source and groundwater. Meanwhile, reports of Cr(Ⅵ) contamination in drinking water due to industrial pollution occur frequently. In this study, a new adsorbent was prepared by calcination of polyaluminum chloride residue. The new adsorbent was characterized, and the adsorption capacity of Cr(Ⅵ) in water was analyzed. The analysis results showed that the new adsorbent not only could provide a larger specific surface area (6 times higher than polyaluminum chloride residue) and more active sites, but also could maintain the stability of its structure. The second-order adsorption kinetic model and Langmuir adsorption isotherm model could well describe the adsorption process of Cr(Ⅵ) on the new material. The Cr(Ⅵ) adsorption by the new adsorbent is a spontaneous endothermic process. Compared with other commonly used adsorbents, the cost of new adsorbent was 1.308 $/kg, and it had obvious economic advantages. This study explored a new way of resource utilization of polyaluminum chloride residue, and the adsorption capacity could still be maintained above 2.6 mg/g after 5 times of regeneration, indicating that the material has engineering application potential. This paper could provide more technical options for environmental protection engineers, provide ideas for environmental researcher, and solve the problem of water pollution by combining with other water treatment technologies.

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《Clean technologies and environmental policy》 |2023年第6期|2055-2069|共15页
作者
Xiaogang Han; Xin Meng; Tingchao YangMing WeiXiaohang Zhang;
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作者单位

College of Geology and Environment, Xi'an University of Science and Technology, Yanta Road, Xi'an 710054, China, Changzhou Qingliu Environmental Protection Technology Co. Ltd, Changzhou 213144, China;

College of Energy and Environmental Engineering, Hebei University of Engineering, Taiji Road, Handan Economic and Technological Development Zone, Handan 056038, Hebei Province, China;

Planning and Development Section, Hydrological Geological Team of Hebei Province Coal Geology Bureanu, 9 Huashan East Street, Handan 056001, Hebei Province, ChinaDepartment of Construction Engineering, Hebei Vocational College of Politics and Law, 569 North Friendship Street, Xinhua District, Shijiazhuang 0560061, Hebei Province, ChinaSchool of Chemical and Environmental Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China, Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources, Research, Institute of Genetics and Development;

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正文语种英语
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关键词
Polyaluminum chloride residue; Hydrotalcite-like structure; Adsorption eifect; Cr(Ⅵ); Adsorption mechanism; Regenerated times;

Preparation of new CaFeAI-layered doubled hydroxides adsorbent for Cr(Ⅵ) adsorption from polyaluminum chloride residue

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