Citation: ZHANG Li, DAI Chao-hua, LIANG Qing-man, YAN Jian-hui, ZHOU Min-jie. Preparation of ZnCr₂O₄-ZnO composite photocatalyst based on the hydrotalcite precursor and its performance in hydrogen production[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(10): 1266-1274. shu

Preparation of ZnCr₂O₄-ZnO composite photocatalyst based on the hydrotalcite precursor and its performance in hydrogen production

College of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China

Corresponding author: ZHOU Min-jie, zmj0104@163.com
Received Date: 26 June 2017
Revised Date: 13 August 2017

Fund Project: The project was supported by the National Natural Science Foundation of China 51372080Scientific Research Foundation of Hunan Provincial Education Department of China 15A076the Natural Science Foundation of Hunan Provincial of China 2017JJ2108The project was supported by the National Natural Science Foundation of China (51372080), the Natural Science Foundation of Hunan Provincial of China (2017JJ2108) and Scientific Research Foundation of Hunan Provincial Education Department of China (15A076)

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ZnCr₂O₄-ZnO composite photocatalyst with heterogeneous structure was synthesized by grinding hydrothermal method and characterized by TG-DTA, XRD, SEM, HRTEM, DRS, and N₂ absorption; its photocatalytic activity in H₂ production was evaluated by using oxalic acid as the sacrificial agent under simulated sunlight irradiation and compared with those of the ZnCr₂O₄-ZnO samples prepared by coprecipitation, urea reflux and urea hydrothermal methods. The results indicate that Zn-Cr precursors prepared by four methods show a certain hydrotalcite structure; the catalyst samples prepared at 500℃ are spherical nanoparticles, but different in agglomeration status, specific surface area and pore structure parameters. The ZnCr₂O₄-ZnO nanoparticles prepared by a grinding hydrothermal method exhibits the optimized photocurrent response and photocatalytic activity; the yield of hydrogen production is 0.956 mmol/(h·g_cat), which is 2.3, 1.5 and 3.0 times higher than that of the catalyst samples prepared by coprecipitation, urea reflux and urea hydrothermal methods, respectively. On the basis of these results, a possible mechanism for the hydrogen production over ZnCr₂O₄-ZnO composite photocatalyst with heterogeneous structure was then proposed.
- grinding hydrothermal method,
- ZnCr₂O₄-ZnO,
- heterojunction,
- photocatalytic hydrogen production
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Preparation of ZnCr₂O₄-ZnO composite photocatalyst based on the hydrotalcite precursor and its performance in hydrogen production