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Issue 5, 2014
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Photochemical preparation of Cd/CdS photocatalysts and their efficient photocatalytic hydrogen production under visible light irradiation

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Abstract

Metal Cd can serve as an analogue of cocatalysts loaded on CdS to separate electrons and holes to significantly enhance the efficiency of CdS photocatalytic hydrogen production. A series of Cd/CdS photocatalysts were synthesized at various molar ratios of CdSO4 and Na2S2O3·5H2O in the presence of simulated solar irradiation. Superior photocatalytic activities relative to that of pure CdS were observed on the Cd/CdS photocatalysts. When the optimal molar ratio R of Na2S2O3·5H2O to cadmium salt is 7, it results in a high average H2-production rate of 1753 μmol h−1. Possible mechanisms for both the formation and the enhanced photocatalytic activity of Cd/CdS were proposed on the basis of theoretical speculation and experimental observations. Most of all, this work highlights that (i) Cd/CdS leads to an improvement in the photocatalytic activity for H2 generation; and (ii) adding Na2S2O3·5H2O into the solution containing cadmium ions to prepare Cd/CdS can effectively remove cadmium ions.

Graphical abstract: Photochemical preparation of Cd/CdS photocatalysts and their efficient photocatalytic hydrogen production under visible light irradiation

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Publication details

The article was received on 03 Dec 2013, accepted on 24 Feb 2014 and first published on 24 Feb 2014


Article type: Paper
DOI: 10.1039/C3GC42466A
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Citation: Green Chem., 2014,16, 2728-2735
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    Photochemical preparation of Cd/CdS photocatalysts and their efficient photocatalytic hydrogen production under visible light irradiation

    Q. Wang, J. Li, Y. Bai, J. Lian, H. Huang, Z. Li, Z. Lei and W. Shangguan, Green Chem., 2014, 16, 2728
    DOI: 10.1039/C3GC42466A

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