期刊
CHEMICAL ENGINEERING JOURNAL
卷 431, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.134245
关键词
Sulfydryl-based carbon dots; Fluorescent hydrogel; Detection and adsorption; Solar steam generation
资金
- National Natural Science Foundation of China [21607044]
- Fundamental Research Funds for the Central Universities [2021MS102]
- Royal Society for a Wolfson Research Merit Award
- Open Research Fund of the School of Chemistry and Chemical Engineering, Henan Normal University [2020ZD01]
In this study, a cellulose-based fluorescent hydrogel with 0D sulfydryl-based carbon dots was developed for the detection and removal of hazardous Hg(II) ions. The hydrogel showed high sensitivity for Hg(II) detection and exhibited a large adsorption capacity. Additionally, the exhausted waste adsorbent was successfully upcycled into a suitable material for solar steam generation.
Employing fluorescent hydrogels for hazardous Hg(II) detection and removal is an efficient method for water purification. However, it remains challenging to establish a fluorescent system with low detection limit and high adsorption capacity that can readily be upcycled into a valuable material resource. Herein, we report on a fluorescent hydrogel with 0D sulfydryl-based carbon dots that are self-assembled with a 3D hydrogel network. The cellulose-based hydrogel exhibited good sensitivity for the detection of Hg(II) over a range from 0 to 40 mu M with a limit detection of 3.0 x 10(-6) M. The adsorption experiments confirmed that the cellulose-based hydrogel exhibits good Hg(II) extraction capacity of over 662.25 mg g(-1) at room temperature, and can effectively reduce the Hg concentration to attain acceptable levels that comply with industrial water standards (0.05 mg L-1). Subsequently, we used a facile strategy to convert the exhausted waste adsorbent by in-situ sulfurization into a suitable material for solar steam generation. The as-prepared upcycled aerogel evaporators exhibited excellent evaporation rates of ~ 1.30 kg m(-2) h(-1) under one sun irradiation. These results not only provide a strategy for heavy metal ion recognition and adsorption, but also provide a route to recycle hazardous waste for seawater desalination.
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