期刊
CHEMOSPHERE
卷 267, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.129324
关键词
Bioflocculant; High salt concentration; Three-dimensional excitation-emission; fluorescence spectrometry; Heavy metals; Adsorption
资金
- National Natural Science Foundation of China [51778298]
- Six Talent Peaks project of Jiangsu Province [JNHB-052]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
A highly efficient bioflocculant Na-Bsp was successfully prepared using a tolerant strain Bacillus sp. under high-salt condition without sterilization. The as-prepared Na-Bsp exhibited high adsorption capacities towards heavy metals, making it a potential alternative adsorbent.
A highly efficient bioflocculant, i.e., Na-Bsp was successfully prepared by using a tolerant strain-Bacillus sp. under high-salt condition without sterilization. Salt-containing medium was not infected by other strains throughout the whole incubation period in 168 h. The as-prepared Na-Bsp was found to be cation-dependent, exhibiting high flocculant efficiency (FE) i.e., 97.69 +/- 0.61%, towards kaolin particles by aid of Fe3+. High FE values were well maintained under a wide pH range and/or boiled water treatment, likely because of the main constituent of polysaccharide. The presence of hydroxyl, carboxyl, and amine groups on the bioflocculant surface were possibly responsible for strong interactions with heavy metals. The adsorption capacities of Pb2+, Cu2+ and Cr6+ were 1000.0, 434.8 and 384.6 mg g(-1), respectively. The changing of structure and configuration of bioflocculant during the metal adsorption were explored by the scanning electron microscope with electron energy loss spectroscopy and three-dimensional excitation-emission fluorescence spectrometry. This study provided a novel production method, whereby the conventional sterilization could be avoided, which is of great environmental significance for steam-saving. Furthermore, the as-prepared Na-Bsp exhibited high adsorption capacities toward heavy metals, which sheds lights on its potential usage as an alternative adsorbent. (C) 2020 Elsevier Ltd. All rights reserved.
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