CIESC Journal ›› 2020, Vol. 71 ›› Issue (6): 2788-2794.DOI: 10.11949/0438-1157.20200096

• Material science and engineering, nanotechnology • Previous Articles     Next Articles

Coal-based carbon quantum dots/carbon nitride composites for photocatalytic CO2 reduction

Ruizhe ZHANG1(),Keke LI1,Kaibo ZHANG1,Wei LIU1,Lisi ZHENG1,Yating ZHANG1,2()   

  1. 1.College of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an 710054, Shaanxi, China
    2.Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Natural Resources, Xi’an 710021, Shaanxi, China
  • Received:2020-02-03 Revised:2020-04-08 Online:2020-06-05 Published:2020-06-05
  • Contact: Yating ZHANG

煤基碳量子点/氮化碳复合材料制备及其光催化还原CO2性能

张睿哲1(),李可可1,张凯博1,刘薇1,郑莉思1,张亚婷1,2()   

  1. 1.西安科技大学化学与化工学院,陕西 西安 710054
    2.自然资源部煤炭资源勘查与综合利用重点实验室,陕西 西安 710021
  • 通讯作者: 张亚婷
  • 作者简介:张睿哲(2000—),男,硕士研究生,1163390636@qq.com
  • 基金资助:
    国家自然科学基金项目(U1810113);陕西省创新能力支撑计划项目(2019TD-021)

Abstract:

Using Taixi anthracite as a raw material, coal-based carbon quantum dots (C-CQDs) were prepared by chemical oxidation, and C-CQDs and urea were used as precursors to prepare coal-based carbon quantum dots/carbon nitride (C-CQDs /g-C3N4) composite materials. The composition and structure of the samples were characterized by means of TEM, XRD, FT-IR, UV-Vis and PL respectively, and the phoyocatalytic potential were assessed in terms of reduction CO2 into methanol under visible light irradiation. The results show that the C-CQDs were uniformly decorated on the surfaces of the C-CQDs/g-C3N4 composite, and the C-CQDs/g-C3N4 exhibited superior photoactivity, the methanol yield up to 28.69 μmol/(g cat), which is about 2.2 times in comparison with that of pure graphite carbon nitride (g-C3N4) in photocatalytic CO2 reduction.

Key words: coal, g-C3N4, catalyst, photochemistry, carbon dioxide, methanol

摘要:

以太西无烟煤为原料,采用化学氧化法制备煤基碳量子点(C-CQDs),进一步以C-CQDs和尿素为前体,原位复合制备得到煤基碳量子点/氮化碳(C-CQDs/g-C3N4)复合材料。采用TEM、XRD、FT-IR、UV-Vis、PL等手段对样品结构性能进行了表征和分析,进而考察了其在光催化还原CO2合成甲醇过程的催化性能。研究表明:C-CQDs均匀地负载在g-C3N4的表面,且掺杂适量的C-CQDs有利于提高C-CQDs/g-C3N4的光催化活性,当可见光照12 h时,其光催化还原CO2甲醇产量最高可达28.69 μmol/(g cat),约为相同条件下纯石墨相g-C3N4作用时甲醇产量的2.2倍。

关键词: 煤, 氮化碳, 催化剂, 光化学, 二氧化碳, 甲醇

CLC Number: