Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 56, Issue 16, Pages 11718-11728Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.2c03033
Keywords
MoS2-based sponge; mercury removal; reuse of hazardous adsorbent waste; solar steam generation; water purification
Categories
Funding
- National Key Research and Development Program of China [2017YFC0210201]
- Natural Science Foundation of Hebei Province [E2016502096]
- National Natural Science Foundation of China [21607044, 51878273]
- Fundamental Research Funds for the Central Universities [2021MS102]
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In this study, a high-quality adsorbent using 3D-MoS(2) sponge was fabricated to reduce heavy metal mercury pollution in water bodies. A secondary water purification strategy was employed to address drinking water shortage. The functionalized adsorbents could efficiently evaporate freshwater under sunlight and meet the drinking water standard.
With the fast development of modern industries, scarcity of freshwater resources caused by heavy metal pollution (i.e., Hg2+) has become a severe issue for human beings. Herein, a 3D-MoS(2 )sponge as an excellent absorbent is fabricated for mercury removal due to its multidimensional adsorption pathways, which decreases the biomagnification effect of methylmercury in water bodies. Furthermore, a secondary water purification strategy is employed to harvest drinkable water with the exhausted adsorbents, thus alleviating the crisis of drinking water shortage. Compared to the conventional landfill treatment, the exhausted MoS2 sponge absorbents are further functionalized with a poly(ethylene glycol) (PEG) layer to prevent the heavy metals from leaking and enhance the hydrophilicity for photothermal conversion. The fabricated evaporator displays excellent evaporation rates of similar to 1.45 kg m(-2) h(-1) under sunlight irradiation and produces freshwater with Hg2+ under the WHO drinking water standard at 0.001 mg L-1. These results not only assist in avoiding the biodeposition effect of mercury in water but also provide an environment-friendly strategy to recycle hazardous adsorbents for water purification.
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