Efficient Removal of Cr(VI) by TiO2 Based Micro-Nano Reactor via the Synergy of Adsorption and Photocatalysis

The low-toxicity treatment of chromium-containing wastewater represents an important way of addressing key environmental problems. In this study, a core-shell structural ZIF-8@TiO2 photocatalyst was synthesized by a simple one-step hydrothermal method. The obtained composite photocatalyst possessed...

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Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2022-01, Vol.12 (2), p.291
Main Authors: Song, Yu, Lu, Xi, Liu, Zhibao, Liu, Wenfei, Gai, Ligang, Gao, Xiang, Ma, Hongfang
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Catalytic activity
Chromium
Cr(VI) removal
Dyes
Efficiency
Electrodes
Ethanol
Holes (electron deficiencies)
Industrial pollution
Industrial wastes
Industrial wastewater
Industrial wastewater treatment
Irradiation
Light irradiation
methyl orange
Morphology
Nanoparticles
Photocatalysis
Photocatalysts
photocatalytic activity
Pollutants
Pore size
Ratios
Titanium dioxide
Toxicity
Wastewater treatment
ZIF-8@TiO2
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Summary:The low-toxicity treatment of chromium-containing wastewater represents an important way of addressing key environmental problems. In this study, a core-shell structural ZIF-8@TiO2 photocatalyst was synthesized by a simple one-step hydrothermal method. The obtained composite photocatalyst possessed improved photocatalytic activity compared with TiO2. The results indicated that the optimized ZIF-8@TiO2 composite exhibited the highest removal efficiency with 93.1% of Cr(VI) after 120 min under UV-vis irradiation. The removal curves and XPS results indicated that the adsorbed Cr(VI) on the ZIF-8 during the dark process was preferentially reduced. The superior removal efficiency of ZIF-8@TiO2 is attributed to the combination of both high adsorption of ZIF-8, which attracted Cr(VI) on the composite surface, and the high separation efficiency of photo-induced electron-hole pairs. For the mixture of wastewater that contained methyl orange and Cr(VI), 97.1% of MO and 99.7% of Cr(VI) were removed after 5 min and 60 min light irradiation, respectively. The high removal efficiency of multiple pollutants provides promising applications in the field of Cr(VI) contaminated industrial wastewater treatment.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano12020291