期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 154, 期 -, 页码 1194-1204出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2019.10.274
关键词
Biosorbent; Lignosulfonate; Cr(VI) adsorption
资金
- National Natural Science Foundation of China, China [21506117]
- Key Research and Development Plan of Shandong, China [2018GGX104015]
- Applied Basic Research Programs of Qingdao [17-1-1-23-jch]
- SDUST, China Research Fund [2018YQJH102, SDKDYC190322]
A lignin-based biosorbent ( LSMA) was prepared by cross- linking lignosulfonate and N- methylanilinewith the aid of ammonium persulfate for efficient removal of Cr(VI) from aqueous solution. Since LSMA possessed both amino groups and oxygen-containing functional groups, such as phenolic, carboxyl, and sulfonic groups, the maximum adsorption capacity of 1264.8 mg/g was achieved at 318 K according to the Langmuir isotherm. LSMA also showed excellent performance at low Cr(VI) concentration solution. The hazardous Cr(VI) solution of 50 mg/L can be fully removed within 10 min. The adsorption process of LSMA fitted the pseudo- second- order kinetic model, suggesting the chemical adsorption characteristics. Moreover, the adsorption process was spontaneous and endothermic. LSMA worked very well even with high content of competing anions. The removal mechanism was demonstrated to be the adsorption of Cr(VI) anions on LSMA with abundant functional groups, and reduction of Cr(VI) to less toxic Cr(III) by the adjacent electron donor groups. The generated Cr(III) was immobilized on LSMA by surface complexation and precipitation. LSMA composite has a great potential for the treatment of Cr(VI)-contaminated water. (C) 2019 Elsevier B.V. All rights reserved.
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