Journal
CHEMICAL ENGINEERING SCIENCE
Volume 257, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2022.117704
Keywords
Heavy metals; Photocatalysis; Mineralization; Layered double hydroxides
Categories
Funding
- National Natural Science Foun-dation of China [21922801, 22090032, 22011530162]
- Trans-formation of Scientific and Technological Achievements in Qinghai Province [2021-GX-172]
- Beijing Natural Science Foun-dation [2202036]
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This study reports the large-scale synthesis of monolayer magnesium-aluminium layered double hydroxide (mMgAl-LDH) nanosheets, which exhibit exceptional performance in efficiently treating heavy metal contamination and visible-light-induced photocatalytic reduction of CO2 as well as removal of anions.
Exploring a sustainable route for the efficient treating/recycling of heavy metal (like Ni2+, Cd2+, Cu2+) contamination of water is highly desirable both from the environment and resource view. Herein, we reported the scale-up synthesis of monolayer magnesium-aluminium layered double hydroxide (mMgAl-LDH) nanosheets, which showed exceptional ability to mineralize Ni2+, Cd2+ and Cu2+ rapidly and efficiently. Furthermore, m-MgAl-LDH can purify 1 ppm Cu2+, Ni(2+ )and Cd2+ to safe levels. The sorption sites of heavy metal ions were revealed. Ni2+ and Cd2+ substitute for the Mg2+ sites within the MgAlLDH layers, while Cu2+ ions anchor on the surface of MgAl-LDH with high dispersion. The mineralized products from Ni2+ and Cu(2+ )cations further showed excellent performance in visible-light-induced photocatalytic reduction of CO2 and removal of anions (like PO(4)(3- )and toxic AsO2- ions) efficiently, providing an alternative for the mitigation of energy and resource crisis. (C) 2022 Elsevier Ltd. All rights reserved.
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