期刊
ENVIRONMENTAL POLLUTION
卷 266, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2020.115389
关键词
Hg(II); Detection; Smart-phone; Carbon adsorbent; Removal
资金
- National Natural Science Foundation of China [51908326]
- China Postdoctoral Science Foundation [2018M640632]
- Major Innovation Project of Shandong Province [2019JZZY010411, 201606220157]
- China Scholarship Council (CSC)
The increased occurrence of Mercury (Hg II) contaminant has caused environmental and health concerns worldwide. Removal of Hg(II) from water is of significant interest, in particular if these can be coupled in a manner of detection. Here, a novel activated carbon (AC) adsorbent and a fast detection device to form a closed-cycle strategy was developed. The synthesis of conjugates of streptavidin-biotinylated DNA probes modified gold nanoparticle was used with lateral flow biosensors for Hg(II) detection. A quantification was completed via a self-developed smartphone app and its limit of detection was 2.53 nM. Moreover, AC was activated with a new activating agent of diammonium hydrogen phosphate. The adsorbent was characterized and determined to have an amorphous microporous structure with a high surface area (1076.5 m(2)g(-1)) and demonstrated excellent removal efficiency (99.99%) and adsorption capacity (similar to 100 mg g(-1)) for Hg(II). The kinetics of the pseudo-second-order model and the mechanisms of electrostatic adsorption, ion exchange, and complex reactions are provided. The proposed closed-cycle strategy can be useful for early, fast, and mobile detection of Hg (II) pollution, followed by its effective removal during water treatment. (C) 2020 Elsevier Ltd. All rights reserved.
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