Carbon quantum dots with photo-generated proton property as efficient visible light controlled acid catalyst
Carbon quantum dots with photo-generated proton property as efficient visible light controlled acid catalyst
复制标题
具有光生质子特性的碳量子点作为高效可见光控制酸催化剂
DOI：
10.1039/c3nr03996j
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发表时间：
2014-01-01
期刊：
影响因子：
6.7
通讯作者：
Kang, Zhenhui
中科院分区：
文献类型：
--
作者：
Li, Haitao;Liu, Ruihua;Kang, Zhenhui
开发光驱动酸催化剂对实现可控酸催化过程向绿色化学工业发展具有重要意义。基于扫描电化学显微镜(SECM)和Delta pH测试，我们证明了通过电化学烧蚀石墨制备的5-10 nm碳量子点(CQD)在溶液中的可见光下具有很强的光致质子性质，可以用作酸催化剂。5-10 nm CQD的催化活性强烈依赖于反应体系的光照强度和温度。在可见光条件下，5-10 nm CQD作为一种有效的可见光驱动和可控酸催化剂，在水溶液中能催化一系列有机反应(酯化、Beckmann重排和Aldol缩合)，转化率分别为34.7-46.2%，而1-4 nm CQD和10-2000 nm石墨则没有这种优异的催化活性。利用5-10 nm的CQD作为光响应性和可控性的光催化剂是碳基纳米材料的一种新的应用，可能会极大地推动当前催化工业、环境污染和能源问题的研究。
Developing light-driven acid catalyst will be very meaningful for the controlled-acid catalytic processes towards a green chemical industry. Here, based on scanning electrochemical microscopy (SECM) and Delta pH testing, we demonstrate that the 5-10 nm carbon quantum dots (CQDs) synthesized by electrochemical ablation of graphite have strong light-induced proton properties under visible light in solution, which can be used as an acid catalyst. The 5-10 nm CQDs' catalytic activity is strongly dependent on the illumination intensity and the temperature of the reaction system. As an effective visible light driven and controlled acid-catalyst, 5-10 nm CQDs can catalyze a series of organic reactions (esterification, Beckmann rearrangement and aldol condensation) with high conversion (34.7-46.2%, respectively) in water solution under visible light, while the 1-4 nm CQDs and 10-2000 nm graphite do not have such excellent catalytic activity. The use of 5-10 nm CQDs as a light responsive and controllable photocatalyst is truly a novel application of carbon-based nanomaterials, which may significantly push research in the current catalytic industry, environmental pollution and energy issues.