Synthesis of cuprous oxide with morphological evolution from truncated octahedral to spherical structures and their size and shape-dependent photocatalytic activities

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• 作者：Deli Jiang ; Chaosheng Xing ; Ximeng Liang ; Leqiang Shao ; Min Chen ; ^{chenmin3226@sina.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Cu2O crystals ; Morphology and size evolution ; Photocatalysis ; Degradation
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：1 January 2016
• 年：2016
• 卷：461
• 期：Complete
• 页码：25-31
• 全文大小：1869 K

文摘

In this study, a facile room-temperature solution-chemical route has been developed to synthesize Cu₂O crystals with various sizes and morphologies. Adjustment of feeding speed of the aqueous mixture of polyvinyl pyrrolidone (PVP) and ascorbic acid (AA) enables the Cu₂O crystal morphology and size evolution. It is also interesting to find that, simple alteration of the feeding speed of AA aqueous solution enables the size of Cu₂O crystals evolved, while the morphology of Cu₂O crystals keep unchanged. These Cu₂O crystals samples were used as photocatalysts for the decomposition of methyl orange (MO) under visible light irradiation. The results show that Cu₂O spiny spheres with hierarchical structure exhibited superior photocatalytic activity compared with truncated octahedrons and spheres. In addition, the photocatalytic activity of truncated octahedral Cu₂O can be greatly improved by decreasing the size of Cu₂O particles. The work demonstrated a novel strategy for the shape and size-controlled synthesis of Cu₂O crystals with superior photocatalytic activities.