期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 750, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.141672
关键词
Bacillus sp. K1; Magnetic biochar; Arsenite; Cadmium; Synergy effect
资金
- National Natural Science Foundation of China [41722111, 41571477]
- National Key Research and Development Programof China [2016YFD0801105]
- Agriculture Research System of China [CARS-01-30]
- Hangzhou Science and Technology Project [20162013A07]
- Fundamental Research Funds for the Central Universities
A novel composite material synthesized by loading Bacillus sp. K1 onto Fe3O4 biochar achieved effective removal of cadmium (Cd) and arsenic (As) in aqueous solution, with maximum adsorption capacities of 25.04 and 4.58 mg g(-1) respectively.
Contaminations by heavy metals in the environment always exist as a mixture of both metal and metalloid. Thus, it is a challenge to simultaneously remove both components due to their adverse chemical behaviors. Herein, effective cadmium (Cd) and arsenic (As) removal in aqueous solution was achieved by use of a novel composite, which was synthesized by Bacillus sp. K1 loaded onto Fe3O4 biochar (MBB). The combination with Bacillus sp. K1 provided new biosorption sites such as amine and hydroxyl groups in the composite surface, which significantly increasing the removal capability of Cd(II) by 230% when compared with the raw magnetic biochar. Both competition and synergy effects were found in binary system. Adsorption of As(III) extended active sites for capturing Cd(II), which appeared on the surface of the MBB as type B ternary surface complexes. The maximum adsorption capacity of Cd(II) and As(III) reached 25.04 and 4.58 mg g(-1) in a binary system, respectively. In summary, this environmentally friendly composite is promising for simultaneous Cd(II) and As(III) remediation. (C) 2020 Elsevier B.V. All rights reserved.
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