期刊
JOURNAL OF CLEANER PRODUCTION
卷 279, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2020.123619
关键词
Bio-carbonate hydroxyapatite; Diffusion dynamics; Ion exchange; Adsorption; Cd2+ remediation
资金
- National Key Research and Development Program of China [2017YFA0605001, 2016YFD0800206]
- Technical Innovation Major Projects of Hubei Province [2018ABA092]
In this study, a medium was designed for the preparation of nano-scale carbonate hydroxyapatite through microbial mineralization, which has a large specific surface area and adsorption capacity, making it a potential candidate for heavy metal bioremediation in polluted environments.
As one of the five most toxic heavy metals, cadmium pollution seriously endangers human health and food safety. Carbonate hydroxyapatite has attracted our attention because of its excellent cleaning ability. However, few ecofriendly synthetic processes of nanoscale carbonate hydroxyapatite limit its application. In this study, we designed a medium that was used to prepare carbonate hydroxyapatite through microbial mineralization. The nano-flaky structure gives it a large specific surface area, which not only can achieve rapid adsorption of Cd2+ but also has a large adsorption capacity (270 mg/g). Dynamic adsorption experiments showed that adsorption is a spontaneous endothermic process. Ion exchange, surface complexation, and co-precipitation are the main adsorption mechanisms. This simple and readily available bio-carbonate hydroxyapatite provides potential candidates for heav y metal bioremediation in polluted environments. (c) 2020 Elsevier Ltd. All rights reserved.
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