木棉纤维改性氮化碳光催化降解有机污染物  

Kapok fiber modified carbon nitride photocatalytic degradation of organic pollutants

作　　者：刘帅 李学雷 李启朦 王彦娟[1] 张健[1] 封瑞江[1] 胡绍争[1] LIU Shuai;LI Xuelei;LI Qimeng;WANG Yanjuan;ZHANG Jian;FENG Ruijiang;HU Shaozheng(College of Chemistry,Chemical Engineering and Environmental Engineering,Liaoning Shihua University,Fushun 113001,Liaoning,China;Department of Chemical and Environmental Engineering,Yingkou Institute of Technology,Yingkou 115014,Liaoning,China;College of Chemical Engineering,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China)

机构地区：[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

出　　处：《化工学报》2020年第12期5530-5540,共11页CIESC Journal

基　　金：辽宁省自然科学基金项目(20170540475)。

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。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 adsorptiondesorption.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.

关 键 词：氮化碳 木棉纤维 生物质 光催化 降解 催化剂 

分 类 号：TQ028.8[化学工程]