Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (2): 306.doi: 10.7503/cjcu20180597

• Physical Chemistry • Previous Articles     Next Articles

Preparation and CO2 Reduction Performance of Composite Photocatalyst Based on Aminated Coal-based Carbon Dots

ABUDUHEIREMU Awati, ZHANG Dedong, HALIDAN Maimaiti*()   

  1. Institute of Chemistry and Chemical Industry, Xinjiang University, Urumqi 830046, China
  • Received:2018-08-27 Online:2019-02-10 Published:2018-11-05
  • Contact: HALIDAN Maimaiti E-mail:m15899160730@163.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.21663028)

Abstract:

The crystalline carbon in the coal structure[coal-based carbon dots(CDs)] was stripped by hydrogen peroxide oxidation method, and then the surface of the synthesized carbon dots was modified by thionyl chloride chlorination, ethylenediamine passivation steps to obtain N, S co-doped aminated coal-based carbon dots(NH2-CDs). After that, using the coordination and dispersing function of amino groups and oxygen-containing functional groups on the surface, a kind of composite photocatalyst, Cu2O/NH2-CDs, was prepared by coating cuprous oxide(Cu2O) nanoparticles, which were obtained by in situ reduction of copper chloride(CuCl2∙2H2O), on the NH2-CDs. The structures of the Cu2O/NH2-CDs were characterized and the photocatalytic performance toward CO2 reduction under visible light was tested. The results show that the presence of NH2-CDs not only makes the composite catalyst possess excellent CO2 adsorption performance, but also improve the efficient electron-hole pair separation and electron transfer ability of the composite catalysts, so that Cu2O/NH2-CDs show excellent CO2 photocatalytic reduction to HCOOH performance. After reaction for 6 h, the amount of HCOOH was up to 2582.4 μmol/g cat, about 7.3 times of that on Cu2O photocatalyst under the same conditions.

Key words: Coal, Aminated carbon dots, Cu2O, Photocatalytic reduction of CO2

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