4.7 Article

Amine-functionalized graphitic carbon nitride decorated with small-sized Au nanoparticles for photocatalytic CO2 reduction

期刊

JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 570, 期 -, 页码 11-19

出版社

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.02.108

关键词

Au/g-C3N4; Plasmonic Au nanoparticles; Introduction of amino groups; Plasma reduction; Photocatalytic CO2 reduction

资金

  1. National Natural Science Foundation of China [51672099, 21403079]
  2. Sichuan Science and Technology Program [2019JDRC0027]
  3. Fundamental Research Funds for the Central Universities [2017-QR-25]

向作者/读者索取更多资源

Amine-functionalized graphitic carbon nitride (g-C3N4) decorated with Au nanoparticles (CN/Au) was prepared by N-2 plasma treatment of g-C3N4 powders impregnated with HAuCl4 center dot 3H(2)O. Well-dispersed Au nanoparticles with a small particle size were deposited on g-C3N4 nanosheets. In addition, the amino group was introduced into the CN/Au system. Without the addition of cocatalyst and sacrificial agent, CN/Au exhibited enhanced photocatalytic activity for CO2 reduction under visible-light irradiation. CO and CH4 evolution rates of CN/Au reached 28.3 and 1.3 mu mol.h(-1).g(-1), which were 7.6 and 2.6 times higher than those of pristine g-C3N4 (CN-0), respectively. The enhanced activity can be explained by these factors. (1) The introduced amino group improved the adsorption capacity of CN/Au for CO2; (2) the hot electrons generated by Au nanoparticles activated the surrounding electrons through energy transfer and caused local temperature to rise, increasing the efficiency of the photoreduction reaction of CO2; (3) the Schottky junction between Au and g-C3N4 promoted the migration of electrons from g-C3N4 to Au nanoparticles, suppressing the recombination of the carriers. Time-of-flight secondary ion mass spectrometry confirmed the introduction of amino groups, and solid-state C-13 nuclear magnetic resonance spectra provided a support for inferring the position of the amino group. (C) 2020 Elsevier Inc. All rights reserved.

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