氯掺杂g-C3N4纳米片光催化氧化染料污染物与还原六价铬的协同处理研究  

Synergistic Photocatalytic Dye Oxidation and Hexavalent Chromium Reduction by Chlorine Doped g-C3N4 Nanosheets

作　　者：赵文玉[1] 易赋淘 甘慧慧 张会宁[3] 钱勇兴 靳慧霞[3] 张科锋[3] ZHAO Wenyu;YI Futao;GAN Huihui;ZHANG Huining;QIAN Yongxing;JIN Huixia;ZHANG Kefeng(College of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004;Faculty of Architecture Engineering and Environment,Ningbo University,Ningbo 315211;School of Civil Engineering and Architecture,Ningbo Institute of Technology,Zhejiang University,Ningbo 315100)

机构地区：[1]桂林理工大学环境科学与工程学院,桂林514004 [2]宁波大学建筑工程与环境学院,宁波315211 [3]浙江大学宁波理工学院土木建筑工程学院,宁波315100

出　　处：《材料导报》2019年第20期3377-3382,共6页Materials Reports

基　　金：国家自然科学基金青年基金(51509220; 21808200);浙江省教育厅一般科研项目(Y201737690);宁波市社会发展科技项目(2017C510006; 2014C50007);宁波市自然科学基金项目(2018A61028)~~

摘　　要：以三聚氰胺与氯化铵为前驱体,通过热缩聚法和液相超声剥离法制备了纳米片状氯掺杂石墨相氮化碳(g-C3N4),采用XRD、XPS、SEM、UV-vis等手段对样品的结构及形貌进行了表征。考察了可见光下,不同改性条件下样品对Cr(Ⅵ)和罗丹明B(RhB)混合溶液的光催化降解性能。结果表明,纳米片状氯掺杂石墨相氮化碳样品对Cr(Ⅵ)和RhB混合溶液中的Cr(Ⅵ)的光催化还原效率比单一Cr(Ⅵ)溶液中提高了2.2倍,对混合溶液中RhB的光催化降解比单一RhB溶液中提高了1.4倍。分析表明改性后的纳米片状氯掺杂氮化碳具有更大的比表面积、更好的光吸收性能和电荷分离能力,改性后的样品对混合溶液中RhB的氧化降解与Cr(Ⅵ)的还原反应同时进行也更有效地促进了光生电子-空穴对分离,从而实现了两种污染物的协同降解处理。Series of chlorine doped g-C3N4 nanosheets were synthesized by thermal condensation and ultrasonic exfoliating methods using melamine and ammonium chloride.The structural and morphological characterization of the as-prepared samples were detected by powder X-ray diffraction pattern(XRD),X-ray photoelectron spectroscope(XPS),scanning electron microscope(SEM),UV-Vis diffuse reflection spectra(UV-Vis DRS).The photocatalytic activities of samples with different doping ratio and exfoliation time were evaluated under visible light.Moreover,the mixed pollutant solution containing rhodamine B(RhB)and hexavalent chromium(Cr(Ⅵ))were photocatalytic degraded by the modified samples.Compared with single pollutant in solution,the treatment efficiency of chlorine doped g-C3N4 nanosheets for RhB and Cr(Ⅵ)in the mixed solution enhance 1.4 times and 2.2 times,respectively.In comparison to bulk g-C3N4,chlorine doped g-C3N4 nanosheets sample possessed larger specific surface,better optical absorption performance and better charge separation capability.The separation of photo-excited holes and electrons is promoted by the simultaneously photocatalytic oxidation of RhB and reduction of Cr(Ⅵ),which lead to the synergistic treatment of RhB and Cr(Ⅵ)in mixed solution.

关 键 词：氮化碳 氯掺杂 纳米片 协同处理 

分 类 号：TQ174[化学工程—陶瓷工业]