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Issue 23, 2016
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Superior performance of CuInS2 for photocatalytic water treatment: full conversion of highly stable nitrate ions into harmless N2 under visible light

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Abstract

Photocatalytic nitrate removal is potentially a green and low-cost technique for water purification; however, no effective visible light photocatalyst has been developed during the past thirty years. Here, we prove that CuInS2 (CIS) is a highly efficient visible light photocatalyst for nitrate removal. By the simultaneous loading of Pt, Ru and Au, it exhibited a high record of nitrate conversion rate of 8.32 mg N h−1 under pure visible light (λ > 400 nm). Highly concentrated NO3 (100 ppm N) can be completely converted into N2 in a few hours, without any over-reduction to ammonia nor production of H2. Under the irradiation of a monochromatic beam from 400 to 650 nm, CIS was most sensitive at 500 nm with an optimal apparent quantum yield of 23.85%. The mechanism was proposed as adsorption–reduction reactions and supported by the fact that the photocatalytic efficiency decreased when halogen ions were added as competing anions. The necessity of using a sacrificial agent during nitrate reduction was validated by a thorough discussion. Herein CIS remained effective when various or harmless sacrificial agents were used. Our work presents a new generation of photocatalysts for nitrate removal and pushes it forward to possible applications in industry.

Graphical abstract: Superior performance of CuInS2 for photocatalytic water treatment: full conversion of highly stable nitrate ions into harmless N2 under visible light

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Publication details

The article was received on 30 Aug 2016, accepted on 11 Oct 2016 and first published on 11 Oct 2016


Article type: Paper
DOI: 10.1039/C6CY01858K
Citation: Catal. Sci. Technol., 2016,6, 8300-8308
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    Superior performance of CuInS2 for photocatalytic water treatment: full conversion of highly stable nitrate ions into harmless N2 under visible light

    M. Yue, R. Wang, B. Ma, R. Cong, W. Gao and T. Yang, Catal. Sci. Technol., 2016, 6, 8300
    DOI: 10.1039/C6CY01858K

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