title: Carbon quantum dots with photo-generated proton property as efficient visible light controlled acid catalyst.
abstract: 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 ΔpH 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.
authors.affiliation: Institute of Functional Nano and Soft Materials (FUNSOM) & Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, No. 199 Ren'ai Road, Suzhou, China. zhkang@suda.edu.cn yangl@suda.edu.cn.
authors.forename: Haitao
authors.initials: H
authors.lastname: Li
authors.forename: Ruihua
authors.initials: R
authors.lastname: Liu
authors.forename: Weiqian
authors.initials: W
authors.lastname: Kong
authors.forename: Juan
authors.initials: J
authors.lastname: Liu
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.forename: Lei
authors.initials: L
authors.lastname: Zhou
authors.forename: Xing
authors.initials: X
authors.lastname: Zhang
authors.forename: Shuit-Tong
authors.initials: ST
authors.lastname: Lee
authors.forename: Zhenhui
authors.initials: Z
authors.lastname: Kang