Brianyoungite/Graphene Oxide Coordination Composites for High-Performance Cu2+ Adsorption and Tunable Deep-Red Photoluminescence

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• 作者：Xiaobin Zhu ; Yun Shan ; Shijie Xiong ; Jiancang Shen ; Xinglong Wu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：June 22, 2016
• 年：2016
• 卷：8
• 期：24
• 页码：15848-15854
• 全文大小：442K
• 年卷期：0
• ISSN：1944-8252

文摘

Graphene oxide (GO) is a good adsorbent for heavy-metal ions because the oxygen functional groups offer active adsorption sites, but a small-size GO with dense oxygen-containing groups has high water solubility causing difficulty in separation. Herein, GO is bound to large brianyoungite (BY) by Zn–O coordination via a hydrothermal reaction that produces BY-GO composites with hollow spherical and flakelike morphologies that are easy to remove. By producing abundant oxygen-containing groups on GO, the Cu²⁺ adsorption capacity increases to 1724.1 mg/g, which is the highest value in graphene-related materials. The experimental and theoretical analysis clearly shows that the infrared spectral shifts toward the low-frequency side of C–O–H and O═C–O bending vibrations in the BY-GO composites stem from the Zn²⁺ (or Cu²⁺) coordination with O atoms in GO. The BY-GO also exhibits tunable deep-red photoluminescence up to 750 nm with a quantum yield of about 1%, which may be useful in infrared optoelectronic devices and solar energy exploitation. The photoluminescence which is different from that previously reported from chemically derived GO can be attributed to the optical transition in the disorder-induced localized states of the carbon–oxygen functional groups.