Preparation of nanocrystalline Cu₂O by a modified solid-state reaction method and its photocatalytic activity

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• 作者：Longfeng Li ; Wenxing Zhang ; Chen Feng ; Xiaowen Luan ; Jian Jiang ; Maolin Zhang
• 关键词：Nanocrystalline materials ; Semiconductors ; Structural ; Cuprous oxide ; Photocatalyst
• 刊名：Materials Letters
• 出版年：2013
• 出版时间：15 September, 2013
• 年：2013
• 卷：107
• 期：Complete
• 页码：123-125
• 全文大小：493 K

文摘

The nanocrystalline Cu₂O was successfully prepared by calcining the precursor synthesized by a ball-milling step using Cu₂(OH)₂CO₃ and H₂C₂O₄¡¤2H₂O as initial reactants without any other additives. The as-synthesized precursor and the resulting calcined product are characterized by XRD and TG/DTA. The result shows that the reaction between Cu₂(OH)₂CO₃ and H₂C₂O₄¡¤2H₂O is complete after 15 min of milling and the precursors are of the crystalline sizes between 17 and 37 nm. The Cu₂O is obtained with crystallite sizes of 15-21 nm after the ball-milled precursors is calcined at 310 ¡ãC for a certain time. The XRD also shows that the ball-milling time and the calcining time influence the crystallite sizes of the products to a certain extent. The average crystallite sizes of Cu₂O decreases gradually with the increase of ball milling time, while they increase gradually with the increase of calcining time. In addition, the prepared Cu₂O exhibits a high catalytic activity for the photodegradation of methyl orange under visible light irradiation, and the photocatalytic degradation ratio of methyl orange reaches to 88.7 % after 2 h of irradiation.