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Visible-Light-Induced Reduction of Hexavalent Chromium Utilizing Cobalt Phosphate (Co-Pi) Sensitized Inverse Opal TiO2 as a Photocatalyst

Abstract

Spurred by the threat of hexavalent chromium (Cr(VI)), the idea of reducing Cr(VI) into less toxic Cr(III) has been commonly approved. Here, we used a facile photodeposition method to make cobalt phosphate (Co-Pi) modified onto inverse opal TiO2 (i.o.TiO2), and the resulting composite was applied for photocatalytic reduction of Cr(VI). This is the first time applying the inverse opal structure as well as the Co-Pi catalyst in the photocatalytic reduction of Cr(VI). In addition, the combination of i.o.TiO2 and Co-Pi achieves high visible-light-driven photocatalytic activity, which is better than that of the pure Co-Pi catalyst and unmodified i.o.TiO2. Experimental results demonstrated that the Co-Pi in the composite could absorb a large amount of visible light and then inject electrons into the conduction band of i.o.TiO2 which subsequently attend the reduction reaction of Cr(VI). Moreover, the inverse opal structure of the catalyst possesses the superiority of large surface area and efficient light harvesting, leading to better catalytic activity of Co–Pi/ i.o.TiO2 than Co-Pi/bulk TiO2 and Co-Pi/P25. It’s also proved that this Co–Pi/ i.o.TiO2 photocatalyst can efficiently remove organic pollutant together with Cr(VI). This study provides new insights into the design and fabrication of efficient photocatalysts for the removal of environmental pollutants under visible light.

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Publication details

The article was received on 26 Aug 2017, accepted on 10 Oct 2017 and first published on 10 Oct 2017


Article type: Paper
DOI: 10.1039/C7CY01748K
Citation: Catal. Sci. Technol., 2017, Accepted Manuscript
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    Visible-Light-Induced Reduction of Hexavalent Chromium Utilizing Cobalt Phosphate (Co-Pi) Sensitized Inverse Opal TiO2 as a Photocatalyst

    W. Lv, Z. Liu, J. Lan, Z. Liu, W. Mi, J. Lei, L. Wang, Y. Liu and J. Zhang, Catal. Sci. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7CY01748K

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