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Synthesis of octahedral and cubic Cu2O microcrystals in sub- and super-critical methanol and their photocatalytic performance

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Abstract

A simple and potentially scalable sub- and super-critical methanol technique was applied to synthesize cuprous oxide. Cu2O microcrystals with two morphologies were obtained in methanol of subcritical domain by adjusting the feeding methods. The effects of the reaction time, temperature, pressure, and feeding method on the formation of Cu2O microcrystals were investigated. XRD, SEM, and XPS were applied to analyze the composition and morphology of products. Results showed that pure cuprous oxide could be obtained in subcritical methanol of 230 °C, 7.8 MPa for 15 min. The two as-obtained products displayed octahedral and cubic morphology with an average edge length of 4 and 2 μm by solution and solid feeding methods, respectively. The formation and crystal growth mechanism of Cu2O in subcritical methanol were also proposed on the basis of above results. Furthermore, the two microcrystals were employed as catalysts in the photodecomposition of negatively charged molecule methyl orange. Results showed that both microcrystals possessed excellent photocatalytic activities. However, the obvious difference between cubic and octahedral in photocatalytic performance was not found in the scale of micrometer (2–4 μm).

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Acknowledgements

The authors gratefully acknowledge the financial supports by the Scientific Research Starting Foundation for Doctors of Science and Technology Agency of Liaoning Province, China (Grant No. 20111047) and (Grant No. 20121070), and Program for Liaoning Excellent Talents in University (Grant No. LR2012012) and (Grant No. LJQ2012034).

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Authors and Affiliations

  1. College of Chemical Engineering, Shenyang University of Chemical Technology, No.9, 11St., Shenyang Economic & Technological Development Zone, Shenyang, 110142, China

    Shuangming Li, Xin Ge, Shengnan Jiang, Zhe Zhang, Wenxiu Li & Sansan Yu

  2. Key Laboratory of Chemical Separation Technology of Liaoning Province, Shenyang University of Chemical Technology, Shenyang, 110142, China

    Shuangming Li, Wenxiu Li & Sansan Yu

  3. Guangdong Food and Drug Vocational and Technical School, Guangzhou, 501163, China

    Xiaona Peng

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  1. Shuangming Li
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  2. Xin Ge
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  5. Zhe Zhang
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  7. Sansan Yu
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Correspondence to Sansan Yu.

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Li, S., Ge, X., Jiang, S. et al. Synthesis of octahedral and cubic Cu2O microcrystals in sub- and super-critical methanol and their photocatalytic performance. J Mater Sci 50, 4115–4121 (2015). https://doi.org/10.1007/s10853-015-8967-3

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  • DOI: https://doi.org/10.1007/s10853-015-8967-3

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