MoS2 Nanosheet Initiated Smart Polymeric Hydrogel for NIR-Driven Ag(I) Enrichment

CHEMICAL ENGINEERING JOURNAL(2020)

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Abstract
Molybdenum disulfide (MoS2) nanosheet is an appealing material due to its various merits such as narrow bandgap, high photothermal conversion speed, and intrinsic sulfur-rich properties. Building up a MoS2-based smart material with all the merits combined has become a challenging topic. Herein, using the monomer N-isopropylacrylamide (NIPAM), a MoS2 self-initiated hydrogel adsorbents was fabricated by manipulation of MoS2 nanosheets as a photoinitiator response to UV light. The hydrogel adsorbent presents a high selectivity to Ag+, and can be quickly recycled upon the photothermal effect induced by 808 nm near-infrared laser irradiation. The adsorption-desorption cycle can be repeated for at least 6 times without obvious decrease of the Ag+ adsorption capacity. The entropy change associated with the desorption process is -16.7 J.K-1.mol(-1), which confirms a spontaneous NIR-induced Ag+ desorption. Our MoS2-based smart hydrogel proves to be energy-efficient, quick-regenerated material for Ag+ enrichment.
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Key words
Molybdenum disulfide,Self-initiated hydrogel,Ag+ enrichment,Light-response,Quick desorption,Cyclic regeneration
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