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Characterization of cadmium biosorption by inactive biomass of two cadmium-tolerant endophytic bacteria Microbacterium sp. D2-2 and Bacillus sp. C9-3.

Authors
  • Long, Jianyou1
  • Yu, Mingxia1
  • Xu, Huaihao1
  • Huang, Shuangqiu1
  • Wang, Zhu2, 3
  • Zhang, Xu-Xiang4
  • 1 School of Environmental Science and Engineering, Institute of Environmental Research at Greater Bay, Institute of Clean Energy and Materials, Guangzhou Key Laboratory for Clean Energy and Materials, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou, 510006, China. , (China)
  • 2 School of Environmental Science and Engineering, Institute of Environmental Research at Greater Bay, Institute of Clean Energy and Materials, Guangzhou Key Laboratory for Clean Energy and Materials, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou, 510006, China. [email protected] , (China)
  • 3 State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China. [email protected] , (China)
  • 4 State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China. , (China)
Type
Published Article
Journal
Ecotoxicology (London, England)
Publication Date
Sep 01, 2021
Volume
30
Issue
7
Pages
1419–1428
Identifiers
DOI: 10.1007/s10646-021-02363-z
PMID: 33620635
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

In this study, two cadmium-tolerant endophytic bacteria (Microbacterium sp. D2-2 and Bacillus sp. C9-3) were employed as biosorbents to remove Cd(II) from aqueous solutions. The influence of initial pH, initial Cd(II) concentration, adsorbent biomass, temperature and contact time on Cd(II) removal were investigated. Results showed that the Langmuir isotherms were found to best fit the equilibrium data, and the maximum biosorption capacities were found to be 222.22 and 163.93 mg/g at a solution pH of 5.0 for Microbacterium sp. D2-2 and Bacillus sp. C9-3, respectively. The biosorption kinetics followed well pseudo-second-order kinetics. Fourier transform infrared spectroscopic analysis suggested that the hydroxyl, carboxyl, carbonyl and amino groups on Microbacterium sp. D2-2 and Bacillus sp. C9-3 biomass were the main binding sites for Cd(II). The results presented in this study showed that Microbacterium sp. D2-2 and Bacillus sp. C9-3 are potential and promising adsorbents for the effective removal of Cd(II) from aqueous solutions. © 2021. The Author(s), under exclusive licence to Springer Science+Business Media, LLC part of Springer Nature.

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