Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 214, Issue -, Pages 126-136Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2017.05.041
Keywords
Chromium removal; Mn3O4@ZnO/Mn3O4; Atomic layer deposition; Photocatalytic reduction; Adsorption
Funding
- Program of International ST Cooperation [2016YFE0123400]
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [2017DX02]
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A novel Mn3O4@ZnO/Mn3O4 composite was designed to remove Cr (VI) and Cr (III) from water by concurrent photocatalysis and adsorption. The Mn3O4@ZnO photocatalyst with core-shell nano-sphere structure, was first fabricated by precisely controlled process using a mild hydrothermal method combined with atomic layer deposition (ALD). The wurtzite ZnO layer was uniformly deposited on hausmannite Mn3O4 surface, which formed a typical II-type heterojunction, separating the photo-generated electron-hole pairs effectively. Hence, rapid Cr (VI) reduction by Mn3O4@ZnO under simulated sunlight irradiation was achieved at 95.3% in 110 min. The pure Mn3O4 as adsorbent could subsequently adsorb the reduced Cr (III) from aqueous solution. Noticeably, the total Cr removal efficiency was enhanced to 92.0% within 70 min by concurrent photocatalysis and adsorption compared to 88.8% even within 120 min in the separate two processes. Mechanism exploration proposed that more active sites on Mn3O4@ZnO surface would be released for continuous photocatalytic reduction of Cr (VI) after the transfer of reduced Cr (III) from Mnv@ZnO onto Mn3O4 surface. In addition, the synergy of photocatalysis and adsorption on Cr removal was the strongest at pH= 6.0 and the highest removal efficiency of 96.0% was realized within 70 min. The outstanding synergistic effect of photocatalytic reduction and adsorption makes the innovative Mn3O4@ZnO/Mn3O4 composite a promising candidate for Cr remediation in aquatic environment. (C) 2017 Elsevier B.V. All rights reserved.
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