CIESC Journal ›› 2020, Vol. 71 ›› Issue (12): 5530-5540.DOI: 10.11949/0438-1157.20200304

• Catalysis, kinetics and reactors • Previous Articles     Next Articles

Kapok fiber modified carbon nitride photocatalytic degradation of organic pollutants

LIU Shuai1(),LI Xuelei2,3,LI Qimeng1,WANG Yanjuan1,ZHANG Jian1(),FENG Ruijiang1,HU Shaozheng1   

  1. 1.College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, Liaoning, China
    2.Department of Chemical and Environmental Engineering, Yingkou Institute of Technology, Yingkou 115014, Liaoning, China
    3.College of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China
  • Received:2020-03-23 Revised:2020-07-18 Online:2020-12-05 Published:2020-12-05
  • Contact: ZHANG Jian

木棉纤维改性氮化碳光催化降解有机污染物

刘帅1(),李学雷2,3,李启朦1,王彦娟1,张健1(),封瑞江1,胡绍争1   

  1. 1.辽宁石油化工大学化学化工与环境学部,辽宁 抚顺 113001
    2.营口理工学院化学与环境工程系,辽宁 营口 115014
    3.辽宁科技大学化学工程学院,辽宁 鞍山 114051
  • 通讯作者: 张健
  • 作者简介:刘帅 (1996— ),男,硕士研究生,626060053@qq.com
  • 基金资助:
    辽宁省自然科学基金项目(20170540475)

Abstract:

A kapok fiber (KF) modified graphite phase carbon nitride (g-C3N4) catalyst was prepared by a one-step pyrolysis method, and the photocatalytic degradation of organic pollutants was investigated. The structure and optical properties of KF-CN were characterized by XRD, UV-Vis DRS, TEM, PL, XPS, FT-IR and N2 adsorption-desorption. The nitrogen adsorption-desorption isotherm results show that the presence of the mesoporous structure can improve the specific surface area of KF-CN. Elemental analysis characterization indicates the biochar modification is conductive to increase the C/N ratio of KF-CN. The XPS characterization also indicates that the introduction of carbon element can change the chemical environment of N element in the lattice of g-C3N4 and thus increases the electron density of N element. The photocatalytic degradation of phenol experiment was carried out to investigate the performance of as-prepared kapok fiber modified graphite carbon nitride photocatalysts by using high-pressure sodium lamp as visible light source. The results show the KF(5%)-CN(600) displayed the highest phenol degradation rate constant of 0.259 h-1, which is 4.2 times of that of neat g-C3N4.The activity of KF(5%)-CN(600) does not decrease significantly after 5 cycles, hinting its excellent catalytic stability and structural stability. The possible reaction mechanism was proposed.

Key words: carbon nitride, kapok fiber, biomass, photocatalytic, degradation, catalyst

摘要:

采用一步热解法制备了木棉纤维(KF)改性的石墨相氮化碳(g-C3N4)催化剂,并考察了催化剂光催化降解有机污染物的性能。采用XRD、UV-Vis DRS、FT-IR、TEM、XPS、N2吸附-脱附、PL表征对催化剂进行了结构、形貌、光学性能测试。结果表明,KF改性可以提高催化剂的比表面积,更大的比表面积可以提供更多的活性位点来参与光催化降解过程。UV-Vis DRS结果表明KF改性可以缩小催化剂的禁带宽度,提高催化剂对光能的吸收。在可见光下,KF改性的g-C3N4基催化剂对苯酚降解速率常数为0.259 h-1,是纯g-C3N4的4.2倍,且具有优异的催化稳定性和结构稳定性。

关键词: 氮化碳, 木棉纤维, 生物质, 光催化, 降解, 催化剂

CLC Number: