MoS2 Nanosheet Initiated Smart Polymeric Hydrogel for NIR-Driven Ag(I) Enrichment
CHEMICAL ENGINEERING JOURNAL(2020)
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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