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g-C3N4/MnO2复合光催化剂的制备及可见光下降解四环素性能 认领 引用 被引量：13
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作者 谭诗杨 杜春艳 +5 位作者 余关龙 宋佳豪 阳露 张卓 王世涛 马新月 《功能材料》 CAS CSCD 北大核心 2020年第6期6164-6168,6214,共5页
通过原位生长法制备了g-C3N4/MnO2复合光催化剂,利用XRD,FTIR和UV-vis DRS等方法表征材料的结构和光学性质,并考察在可见光照射下降解四环素的性能。结果表明,MnO2的引入增强了g-C3N4对可见光的吸收;g-C3N4/MnO2复合材料的光催化活性较... 通过原位生长法制备了g-C3N4/MnO2复合光催化剂,利用XRD,FTIR和UV-vis DRS等方法表征材料的结构和光学性质,并考察在可见光照射下降解四环素的性能。结果表明,MnO2的引入增强了g-C3N4对可见光的吸收;g-C3N4/MnO2复合材料的光催化活性较单体得到提升,在可见光照射90 min内对TC降解率可达77.1%,经过5次循环实验后,对TC的降解率仅下降4%,复合材料具有良好的稳定性;机理研究表明,·O2-是反应体系中的主要活性物质,g-C3N4与MnO2之间形成了Z型异质结,促进了光生电子-空穴的转移,提高了光催化活性。 展开更多
关键词 g-C3N4/MnO2 光催化 四环素 可见光 异质结
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氮掺杂碳量子点促进Bi2MoO6/g-C3N4的可见光驱动电荷转移以高效降解环丙沙星 认领 引用
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作者 王晓云 陈礼洪 +2 位作者 陈可轩 傅俊浩 付爱民 《环境科学学报》 CAS CSCD 北大核心 2026年第2期158-175,共18页
以水热法制备了氮掺杂碳量子点(N-CQDs),并进一步合成了N-CQDs@Bi2MoO6/g-C3N4(NCD@BMCN)间接Z型异质结光催化材料,通过透射电镜(TEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、紫外-可见光漫反射光谱(UV-Vis DRS)、X... 以水热法制备了氮掺杂碳量子点(N-CQDs),并进一步合成了N-CQDs@Bi2MoO6/g-C3N4(NCD@BMCN)间接Z型异质结光催化材料,通过透射电镜(TEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、紫外-可见光漫反射光谱(UV-Vis DRS)、X射线光电子能谱(XPS)、电化学阻抗(EIS)、时间分辨荧光衰减光谱(TRFL)等手段对NCD@BMCN的形貌及其化学性能进行表征.研究发现NCD可显著缩小纳米复合材料的带隙,NCD@BMCN具有高比表面积、高光电流密度和低电荷转移电阻,因此有着出色的电荷转移效率,从而增强了CIP的光降解能力.降解实验表明,当NCD@BMCN投加量为1.0 g·L-1,CIP浓度为50 mg·L-1,在pH=8条件下,经可见光照射30 min可以实现CIP的降解率达到98.2%,反应速率常数为0.14 min-1,TOC去除率为87.2%;复合材料经6次重复使用对CIP的降解率仍能达到95.5%;水中有机物及阴离子浓度与CIP降解率呈负相关;通过淬灭实验及电顺磁共振分析可知降解CIP的过程中,主要的活性物种为·OH、·O2-,其贡献率分别为93.57%、87.86%降解机理主要是由于NCD@BMCN具有间接Z型结构,NCD既能作为光吸收体产生更多e-、h+以增强光催化活性,又能抑制电荷载流子复合过程.高效实现了光激发条件下e--h+的界面转移和空间分离,抑制了光生载流子的复合,使光催化性能显著提升.高效液相色谱-质谱检测发现,NCD@BMCN对CIP的光降解过程主要包括脱氟、脱酸、脱甲基化、羟基化、开环、脱胺基等反应,并最终将CIP氧化为CO2、H2O和小分子有机物. 展开更多
关键词 氮掺杂碳量子点(N-CQDs) Bi2MoO6/g-C3N4 电荷桥接 定向电荷转移 光催化性能 环丙沙星(CIP)
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基于Ag掺杂g-C3N4/SnO2复合材料的低温高响应乙醇气体传感器 认领 引用
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作者 郭晓丽 叶祉旭 《传感器技术与应用》 2026年第3期585-599,共15页
开发高性能乙醇气体传感器在食品安全、医疗诊断与工业安全等领域具有重要意义。本文通过水热法成功制备了二维层状材料石墨氮化碳(g-C3N4)修饰的二氧化锡(SnO2)复合材料。得益于更小的纳米球状结构提供的丰富活性位点和形成的II型异质... 开发高性能乙醇气体传感器在食品安全、医疗诊断与工业安全等领域具有重要意义。本文通过水热法成功制备了二维层状材料石墨氮化碳(g-C3N4)修饰的二氧化锡(SnO2)复合材料。得益于更小的纳米球状结构提供的丰富活性位点和形成的II型异质结有效促进了界面电荷转移与气体分子吸附过程。所得的5wt% g-C3N4/SnO2传感器在100 ppm乙醇气体检测中表现出高响应值(Ra/Rg = 40.7),低检测限(0.3 ppm),最佳工作温度为200℃以及优异的选择性。相比于SnO2传感器而言最佳工作温度降低了175℃且响应值翻倍。在将g-C3N4成功引入到SnO2的基础上,进一步引入粒径Ag纳米颗粒,所制备的3wt% Ag-5wt% g-C3N4/ SnO2复合材料展现出最优异的气敏性能,其最佳工作温度为150℃,在100 ppm乙醇气氛中的响应值提升至45.6,与5wt% g-C3N4/SnO2二元复合材料相比,其最佳工作温度进一步降低了50℃。本研究为开发低工作温度、高灵敏度与高选择性的乙醇气体传感器提供了一种有效的材料设计策略。 展开更多
关键词 乙醇气体传感器 SnO2 g-C3N4 异质结 Ag掺杂
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Strategically designing and fabricating nitrogen and sulfur Co-doped g-C3N4 for accelerating photocatalytic H2 evolution 认领 引用 被引量：6
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作者 Haitao Wang Lianglang Yu +2 位作者 Jiahe Peng Jing Zou Jizhou Jiang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第5期111-119,共9页
Doping engineering is an effective strategy for graphitic carbon nitride(g-C3N4)to improve its photocat-alytic hydrogen evolution reaction(HER)performance.In this work,a novel nitrogen and sulfur co-doped g-C_(3... Doping engineering is an effective strategy for graphitic carbon nitride(g-C3N4)to improve its photocat-alytic hydrogen evolution reaction(HER)performance.In this work,a novel nitrogen and sulfur co-doped g-C3N4(N,S-g-C3N4)is elaborately designed on the basis of theoretical predictions of first-principle density functional theory(DFT).The calculated Gibbs free energy of adsorbed hydrogen(ΔGH∗)for N,S-g-C3N4 at the N-doping active sites is extremely close to zero(0.01 eV).Inspired by the theoretical predictions,the N,S-g-C3N4 is successfully fabricated through ammonia-rich pyrolysis synthesis strategy,in which ammonia is in-situ obtained by pyrolyzing melamine.Subsequent characterizations indicate that the N,S-g-C3N4 possesses high specific surface area,outstanding light utilization,good hydrophilicity,and efficient carrier transfer efficiency.Consequently,the N,S-g-C3N4 displays an extremely high H2 evolution rate of 8269.9μmol g−1 h−1,achieves an apparent quantum efficiency(AQE)of 3.24%,and also possesses outsatnding durability.Theoretical calculations further demonstrate that N and S dopants can not only introduce doping energy level to reduce the band gap,but also induce charge redistribution to facilitate hydrogen adsorption,thus promoting the photocatalytic HER process.Moreover,femtosecond transient absorption(fs-TA)spectroscopy further corroborates the efficient photogenerated carrier transport of N,S-g-C3N4.This research highlights a promising and reliable strategy to achieve superior photocatalytic activity,and exhibits significant guidance for precise designing high-efficiency photocatalysts. 展开更多
关键词 Theoretical predictions g-C3N4 N and S co-doping Photocatalytic H2evolution
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N-g-C3N4/CoS2复合材料的制备及其光催化产氢性能 认领 引用 被引量：1
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作者 陈建军 周诗园 +3 位作者 黄雨晨 尤红歌 郑添祥 李永宇 《复合材料学报》 EI CAS CSCD 北大核心 2025年第4期1991-1999,共9页
氮化碳(CN)是目前最具发展前景的非金属催化剂之一,但由于其特殊的电子结构导致分子内载流子分离效率较差,其光催化活性不理想。为了改善其光催化性能,首先以尿素和柠檬酸为原料,利用高温缩合方法得到N掺杂的g-C3N4(NCN)。然后通... 氮化碳(CN)是目前最具发展前景的非金属催化剂之一,但由于其特殊的电子结构导致分子内载流子分离效率较差,其光催化活性不理想。为了改善其光催化性能,首先以尿素和柠檬酸为原料,利用高温缩合方法得到N掺杂的g-C3N4(NCN)。然后通过光沉积的方法成功制备了CoS2修饰的NCN光催化复合材料(NCN/CoS2)。CoS2的引入有效增强了氮化碳的光生载流子分离效率。同时N的掺杂有效调控氮化碳的带隙,拓宽了氮化碳的可见光响应范围。光催化产氢结果显示,在可见光照射(λ>420 nm)下,NCN/10CoS2复合材料具有最佳的光催化产氢性能(73.8μmol·g-1·h-1),分别为NCN(15.0μmol·g-1·h-1)和CN/10CoS2(7.1μmol·g-1·h-1)的4.9倍和10.4倍。 展开更多
关键词 g-C3N4 N掺杂 CoS2 光催化 产氢
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Novel 3D-on-2D g-C3N4/AgInxSyheterojunction photocatalyst for simultaneous and stoichiometric production of H2and H2O2from water splitting under visible light 认领 引用 被引量：1
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作者 Hualin Jiang Wenxi Ye +4 位作者 Huitao Zhen Xubiao Luo Vyacheslav Fominski Long Ye Pinghua Chen 《Chinese Chemical Letters》 SCIE CAS CSCD 2025年第2期448-453,共6页
Photocatalytic H2production from water splitting is a promising candidate for solving the increasing energy crisis and environmental issues.Herein we report a novel g-C3N4/Ag InxSyS-scheme heterojunctio... Photocatalytic H2production from water splitting is a promising candidate for solving the increasing energy crisis and environmental issues.Herein we report a novel g-C3N4/Ag InxSyS-scheme heterojunction photocatalyst for water splitting into stoichiometric H2and H2O2under visible light.The catalyst was prepared by depositing 3D bimetallic sulfide(Ag InxSy)nanotubes onto 2D g-C3N4nanosheets.Owing to the special 3D-on-2D configuration,the photogenerated carriers could be rapidly transferred and effectively separated through the abundant interfacial heterostructures to avoid recombination,and therefore excellent performance for visible light-driven water splitting could be obtained,with a 24-h H2evolution rate up to 237μmol g-1h-1.Furthermore,suitable band alignment enables simultaneous H2and H2O2production in a 1:1 stoichiometric ratio.H2and H2O2were evolved on the conduction band of g-C3N4and on the valance band of Ag InxSy,respectively.The novel 3D-on-2D configuration for heterojunction construction proposed in this work provided alternative research ideas toward photocatalytic reaction. 展开更多
关键词 Photocatalysis Water splitting g-C3N4 Silver indium sulfide H2production H2O2production
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基于g-C3N4的复合材料在压电光催化领域的研究进展 认领 引用
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作者 梁语嫣 董坤范 +3 位作者 邓梓瑜 贾静茹 周峻安 傅仰河 《材料科学》 2026年第3期35-42,共8页
压电光催化是一种通过耦合半导体材料的光激发特性和压电材料的机械能响应的新兴协同催化技术,有效解决传统光催化中光生载流子快速复合的关键问题。石墨相氮化碳(g-C3N4)因其独特的非中心对称层状结构(具本征压电性)、可见光响应、适... 压电光催化是一种通过耦合半导体材料的光激发特性和压电材料的机械能响应的新兴协同催化技术,有效解决传统光催化中光生载流子快速复合的关键问题。石墨相氮化碳(g-C3N4)因其独特的非中心对称层状结构(具本征压电性)、可见光响应、适宜能带结构及高稳定性等优势,成为构建高性能压电光催化复合材料的理想基底。本文系统综述了近年来基于g-C3N4的复合材料在压电光催化领域的主要进展,重点阐述材料的设计策略、性能增强机理及应用。 展开更多
关键词 压电光催化 g-C3N4复合材料
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甲基橙嵌入的g-C3N4用于光催化降解四环素和产氢 认领 引用
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作者 常越 郭静雯 +5 位作者 赵博文 朱艳博 朱金环 沈晶晶 王雨河 陈建军 《材料科学》 2026年第1期119-128,共10页
采用二氰二胺与甲基橙(MO)为前驱体,通过热共聚工艺制备出甲基橙嵌入的石墨相氮化碳(CN-MO),同时对甲基橙的含量进行了调控。通过X射线衍射、红外光谱、X射线光电子能谱、紫外–可见吸收光谱及荧光光谱对材料进行了表征。结果表明:相较... 采用二氰二胺与甲基橙(MO)为前驱体,通过热共聚工艺制备出甲基橙嵌入的石墨相氮化碳(CN-MO),同时对甲基橙的含量进行了调控。通过X射线衍射、红外光谱、X射线光电子能谱、紫外–可见吸收光谱及荧光光谱对材料进行了表征。结果表明:相较于g-C3N4 (CN),CN-MO15的可见光响应范围变宽,同时光生载流子分离效率显著增强。光催化分解水产氢结果表明,经甲基橙嵌入的CN展现出优异的析氢性能,其中CN-MO15在可见光照射条件下的产氢速率达到858.14 μmol·g−1·h−1,为CN的10.96倍。光催化降解实验表明,该催化剂对四环素的降解动力学常数为0.01006 min−1,降解速率是CN的2.53倍,该研究为高效可见光催化剂开发提供了新途径。 展开更多
关键词 g-C3N4 甲基橙 可见光催化 四环素 产氢
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用于丙酮传感的g-C3N4/WO3异质结构复合材料 认领 引用
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作者 郝静怡 《传感器技术与应用》 2026年第3期357-366,共10页
随着工业化的快速发展和人们健康意识的提升,对有害气体进行高灵敏度、快速响应的检测需求日益迫切。丙酮作为一种典型的挥发性有机化合物,不仅是重要的工业溶剂,其浓度水平更可作为糖尿病等疾病的呼气生物标志物,尤其在糖尿病患者呼出... 随着工业化的快速发展和人们健康意识的提升,对有害气体进行高灵敏度、快速响应的检测需求日益迫切。丙酮作为一种典型的挥发性有机化合物,不仅是重要的工业溶剂,其浓度水平更可作为糖尿病等疾病的呼气生物标志物,尤其在糖尿病患者呼出气体中,丙酮的诊断阈值仅为1.8 ppm,远高于健康人群。因此,开发能够在低浓度(亚ppm级)下对丙酮进行快速、准确检测的高性能气体传感器,对于环境监测与早期无创疾病诊断具有重要的现实意义。金属氧化物半导体(MOS)气体传感器因其结构简单、成本低廉等优势被广泛应用,然而仍然存在一些问题如工作温度高、选择性差及检测限较高等。针对上述问题,本研究以典型n型半导体三氧化钨(WO3)为基础,通过引入二维材料石墨相氮化碳(g-C3N4)构建异质结构,旨在提升其对丙酮的气敏性能。优化后的材料具有高响应、更低的工作温度、更短的响应时间并且对丙酮具有更好的选择性,证明了g-C3N4/WO3在丙酮传感方面的巨大潜力。 展开更多
关键词 丙酮检测 二维材料 g-C3N4 WO3 异质结
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Ag_3PO_4-MnO_2/g-C_3N_4非均相臭氧催化对页岩气钻井废水的深度处理 认领 引用 被引量：11
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作者 朱天菊 陈春燕 +3 位作者 王兵 任宏洋 邹平 向军 《环境工程学报》 CAS CSCD 北大核心 2018年第5期1365-1371,共7页
采用热缩聚合成法、水热法制备Ag_3PO_4-MnO_2/g-C_3N_4三元复合催化剂。利用XRD和SEM对其进行结构表征,并考察催化剂用量、废水pH、臭氧投加量等因素对页岩气钻井废水深度处理效果的影响。结果表明,Ag_3PO_4-MnO_2/g-C_3N_4三元复合催... 采用热缩聚合成法、水热法制备Ag_3PO_4-MnO_2/g-C_3N_4三元复合催化剂。利用XRD和SEM对其进行结构表征,并考察催化剂用量、废水pH、臭氧投加量等因素对页岩气钻井废水深度处理效果的影响。结果表明,Ag_3PO_4-MnO_2/g-C_3N_4三元复合催化剂中,立方晶型Ag_3PO_4、纳米纤维状MnO_2与经模板剂制得的管孔状g-C_3N_4成功复合,改变了其晶面的有序性并增大了比表面积。通过复合提高了Ag_3PO_4的稳定性及其与MnO_2协同作用对臭氧的催化活性。在催化剂投加量为0.5g·L-1,废水pH为11,臭氧投加量为3.2mg·min-1,反应时间为40min的条件下,对预处理后的页岩气钻井废水(COD含量为1076mg·L-1)COD的去除率为85.1%,该复合催化剂重复使用5次后仍保持良好的活性和稳定性。 展开更多
关键词 Ag3PO4 MnO2 g-C3N4 臭氧催化氧化 页岩气钻井废水
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前沿科研成果融入光化学与光电化学教学课程-NiO/g-C3N4光电催化水氧化中的应用 认领 引用 被引量：1
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作者 毕玲玲 梁晓波 +2 位作者 张立静 吴妹 蒋金龙 《广东化工》 CAS 2025年第7期170-172,166,共3页
探讨了光化学与光电化学课程教学改革发展现状,并对教学内容进行改革。拟构建教学案例库,改进考核方式,同时将专业课程内容与前沿科研成果结合,让学生从本科起就接触科学研究,培养学生科研创新意识和能力。本文将利用NiO/g-C3N4光电催... 探讨了光化学与光电化学课程教学改革发展现状,并对教学内容进行改革。拟构建教学案例库,改进考核方式,同时将专业课程内容与前沿科研成果结合,让学生从本科起就接触科学研究,培养学生科研创新意识和能力。本文将利用NiO/g-C3N4光电催化剂在教学实践和指导学生开展科学实验过程中了解光电催化分解水原理及应用。利用教学与科研结合模式,使学生了解光电催化领域,提高学生对科学研究的兴趣以及解决问题的能力,促进教学质量的提高。 展开更多
关键词 光电化学 改革 实践 水氧化 g-C3N4
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Sulfur-doped g-C3N4/TiO2 S-scheme heterojunction photocatalyst for Congo Red photodegradation 认领 引用 被引量：76
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作者 Juan Wang Guohong Wang +2 位作者 Bei Cheng Jiaguo Yu Jiajie Fan 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第1期56-68,共13页
Constructing step-scheme(S-scheme)heterojunctions has been confirmed as a promising strategy for enhancing the photocatalytic activity of composite materials.In this work,a series of sulfur-doped g-C3N4(SCN)/TiO2 S-sc... Constructing step-scheme(S-scheme)heterojunctions has been confirmed as a promising strategy for enhancing the photocatalytic activity of composite materials.In this work,a series of sulfur-doped g-C3N4(SCN)/TiO2 S-scheme photocatalysts were synthesized using electrospinning and calcination methods.The as-prepared SCN/TiO2 composites showed superior photocatalytic performance than pure TiO2 and SCN in the photocatalytic degradation of Congo Red(CR)aqueous solution.The significant enhancement in photocatalytic activity benefited not only from the 1D well-distributed nanostructure,but also from the S-scheme heterojunction.Furthermore,the XPS analyses and DFT calculations demonstrated that electrons were transferred from SCN to TiO2 across the interface of the SCN/TiO2 composites.The built-in electric field,band edge bending,and Coulomb interaction synergistically facilitated the recombination of relatively useless electrons and holes in hybrid when the interface was irradiated by simulated solar light.Therefore,the remaining electrons and holes with higher reducibility and oxidizability endowed the composite with supreme redox ability.These results were adequately verified by radical trapping experiments,ESR tests,and in situ XPS analyses,suggesting that the electron immigration in the photocatalyst followed the S-scheme heterojunction mechanism.This work can enrich our knowledge of the design and fabrication of novel S-scheme heterojunction photocatalysts and provide a promising strategy for solving environmental pollution in the future. 展开更多
关键词 TiO2 nanofiber Sulfur-doped g-C3N4 Step-scheme heterojunction photocatalysis In situ XPS S-scheme mechanism
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In situ construction of protonated g-C3N4/Ti3C2 MXene Schottky heterojunctions for efficient photocatalytic hydrogen production 认领 引用 被引量：30
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作者 Haotian Xu Rong Xiao +3 位作者 Jingran Huang Yan Jiang Chengxiao Zhao Xiaofei Yang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第1期107-114,共8页
Converting sustainable solar energy into hydrogen energy over semiconductor-based photocatalytic materials provides an alternative to fossil fuel consumption.However,efficient photocatalytic splitting of water to real... Converting sustainable solar energy into hydrogen energy over semiconductor-based photocatalytic materials provides an alternative to fossil fuel consumption.However,efficient photocatalytic splitting of water to realize carbon-free hydrogen production remains a challenge.Heterojunction photocatalysts with well-defined dimensionality and perfectly matched interfaces are promising for achieving highly efficient solar-to-hydrogen conversion.Herein,we report the fabrication of a novel type of protonated graphitic carbon nitride(PCN)/Ti3C2 MXene heterojunctions with strong interfacial interactions.As expected,the two-dimensional(2D)PCN/2D Ti3C2 MXene interface heterojunction achieves a highly improved hydrogen evolution rate(2181μmol∙g‒1)in comparison with bulk g-C3N4(393μmol∙g‒1)and protonated g-C3N4(816μmol∙g‒1).The charge-regulated surfaces of PCN and the accelerated charge transport at the face-to-face 2D/2D Schottky heterojunction interface are the major contributors to the excellent hydrogen evolution performance of the composite photocatalyst. 展开更多
关键词 g-C3N4 Ti3C2 Hybridization Schottky heterojunction Protonation Photocatalytic hydrogen production
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Sulfur-mediated photodeposition synthesis of NiS cocatalyst for boosting H2-evolution performance of g-C3N4 photocatalyst 认领 引用 被引量：17
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作者 Min Wang Jingjing Cheng +3 位作者 Xuefei Wang Xuekun Hong Jiajie Fan Huogen Yu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第1期37-45,共9页
Modification of nickel sulfide cocatalysts is considered to be a promising approach for efficient enhancement of the photocatalytic hydrogen production performance of g-C3N4.Providing more NiS cocatalyst to function a... Modification of nickel sulfide cocatalysts is considered to be a promising approach for efficient enhancement of the photocatalytic hydrogen production performance of g-C3N4.Providing more NiS cocatalyst to function as active sites of g-C3N4 is still highly desirable.To realize this goal,in this work,a facile sulfur-mediated photodeposition approach was developed.Specifically,photogenerated electrons excited by visible light reduce the S molecules absorbed on g-C3N4 surface to S^2‒,and subsequently NiS cocatalyst is formed in situ on the g-C3N4 surface by a combination of Ni2+and S2‒due to their small solubility product constant(Ksp=3.2×10^‒19).This approach has several advantages.The NiS cocatalyst is clearly in situ deposited on the photogenerated electron transfer sites of g-C3N4,and thus provides more active sites for H2 production.In addition,this method utilizes solar energy with mild reaction conditions at room temperature.Consequently,the synthesized NiS/g-C3N4 photocatalyst achieves excellent hydrogen generation performance with the performance of the optimal sample(244μmol h^‒1 g^‒1)close to that of 1 wt%Pt/g-C3N4(316μmol h^‒1 g^‒1,a well-known excellent photocatalyst).More importantly,the present sulfur-mediated photodeposition route is versatile and facile and can be used to deposit various metal sulfides such as CoSx,CuSx and AgSx on the g-C3N4 surface,and all the resulting metal sulfide-modified g-C3N4 photocatalysts exhibit improved H2-production performance.Our study offers a novel insight for the synthesis of high-efficiency photocatalysts. 展开更多
关键词 g-C3N4 NiS Co-catalyst Sulfur-mediated photodeposition H2 Photocatalysis
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g-C_3N_4/TiO_2复合材料光催化降解布洛芬的机制 认领 引用 被引量：42
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作者 苏海英 王盈霏 +7 位作者 王枫亮 苏跃涵 蔡宗苇 刘国光 吕文英 姚琨 李富华 陈平 《中国环境科学》 EI CAS CSSCI CSCD 北大核心 2017年第1期195-202,共8页
以TiCl_3为TiO_2钛源,二聚氰胺为g-C_3N_4前驱体,制备了g-C_3N_4/TiO_2复合材料;通过透射电子显微镜(TEM)、X射线衍射(XRD)和紫外可见光吸收光谱(UV-vis)等对g-C_3N_4/TiO_2复合材料进行形貌、元素和催化活性的表征.结果表明,TiO_2能很... 以TiCl_3为TiO_2钛源,二聚氰胺为g-C_3N_4前驱体,制备了g-C_3N_4/TiO_2复合材料;通过透射电子显微镜(TEM)、X射线衍射(XRD)和紫外可见光吸收光谱(UV-vis)等对g-C_3N_4/TiO_2复合材料进行形貌、元素和催化活性的表征.结果表明,TiO_2能很好地依附在g-C_3N_4的表面;吸收光发生了红移,扩大了TiO_2的吸收光谱范围;催化剂活性实验研究表明g-C_3N_4与TiO_2按1:9的质量掺杂比例制备出的g-C_3N_4-10/TiO_2复合材料对布洛芬(IBU)的光催化降解效果最好;实验同时研究了g-C_3N_4-10/TiO_2复合材料对IBU光催化降解的影响机制.IBU的光催化反应符合准一级动力学规律;酸性环境下有利于IBU的降解;使用异丙醇作为·OH分子探针,检测到·OH存在于g-C_3N_4/TiO_2光催化体系中,并计算得出·OH的贡献率为73.7%,表明·OH在降解中起到主要作用. 展开更多
关键词 布洛芬 g-C3N4/TiO2 光催化降解 一级动力学 活性氧化物种
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In situ preparation of g-C3N4/Bi4O5I2 complex and its elevated photoactivity in Methyl Orange degradation under visible light 认领 引用 被引量：22
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作者 Zhe Feng Lin Zeng +4 位作者 Qingle Zhang Shifeng Ge Xinyue Zhao Hongjun Lin Yiming He 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2020年第1期149-162,共14页
A graphite carbon nitride(g-C3N4)modified Bi4O5I2 composite was successfully prepared insitu via the thermal treatment of a g-C3N4/Bi OI precursor at 400°C for 3 hr.The as-prepared g-C3N4/Bi4O5I2 showed high phot... A graphite carbon nitride(g-C3N4)modified Bi4O5I2 composite was successfully prepared insitu via the thermal treatment of a g-C3N4/Bi OI precursor at 400°C for 3 hr.The as-prepared g-C3N4/Bi4O5I2 showed high photocatalytic performance in Methyl Orange(MO)degradation under visible light.The best sample presented a degradation rate of 0.164 min^-1,which is 3.2 and 82 times as high as that of Bi4O5I2 and g-C3N4,respectively.The g-C3N4/Bi4O5I2 was characterized by X-ray powder diffractometer(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),Raman,X-ray photoelectron spectroscopy(XPS),ultraviolet-visible diffuse reflectance spectra(DRS),electrochemical impedance spectroscopy(EIS)and transient photocurrent response in order to explain the enhanced photoactivity.Results indicated that the decoration with a small amount of g-C3N4 influenced the specific surface area only slightly.Nevertheless,the capability for absorbing visible light was improved measurably,which was beneficial to the MO degradation.On top of that,a strong interaction between g-C3N4 and Bi4O5I2 was detected.This interplay promoted the formation of a favorable heterojunction structure and thereby enhanced the charge separation.Thus,the g-C3N4/Bi4O5I2 composite presented greater charge separation efficiency and much better photocatalytic performance than Bi4O5I2.Additionally,g-C3N4/Bi4O5I2 also presented high stability.·O2^- and holes were verified to be the main reactive species. 展开更多
关键词 g-C3N4 Bi4O5I2 Methyl Orange degradation Heterojunction Visible light
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Co-MOF as an electron donor for promoting visible-light photoactivities of g-C3N4 nanosheets for CO2 reduction 认领 引用 被引量：17
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作者 Qiuyu Chen Sijia Li +4 位作者 Hongyi Xu Guofeng Wang Yang Qu Peifen Zhu Dingsheng Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第3期514-523,共10页
A possible mechanism for boosting the visible-light photoactivities of graphitic carbon nitride(g-C3N4)nanosheets for CO2 reduction via coupling with the electron donor Co-metal-organic framework(MOF)is proposed in th... A possible mechanism for boosting the visible-light photoactivities of graphitic carbon nitride(g-C3N4)nanosheets for CO2 reduction via coupling with the electron donor Co-metal-organic framework(MOF)is proposed in this study.Specifically,Co-MOF as an electron donor is capable of transferring the photogenerated electrons in the lowest unoccupied molecular orbital(LUMO)to the conduction band of g-C3N4 to facilitate charge separation.As expected,the prepared Co-MOF/g-C3N4 nanocomposites display excellent visible-light-driven photocatalytic CO2 reduction activities.The CO production rate of 6.75μmol g–1 h–1 and CH4 evolution rate of 5.47μmol g–1 h–1 are obtained,which are approximately 2 times those obtained with the original g-C3N4 under the same conditions.Based on a series of analyses,it is shown that the introduction of Co-MOF not only broadens the range of visible-light absorption but also enhances the charge separation,which improves the photocatalytic activity of g-C3N4 to a higher level.In particular,the hydroxyl radical(·OH)experiment was operated under 590 nm(single-wavelength)irradiation,which further proved that the photogenerated electrons in the LUMO of Co-MOF can successfully migrate to g-C3N4.This work may provide an important strategy for the design of highly efficient g-C3N4-based photocatalysts for CO2 reduction. 展开更多
关键词 Co-MOF g-C3N4 nanosheets Charge separation Visible-light photoactivity Photocatalytic CO2 conversion
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Ag-Ag2O/TiO2-g-C3N4纳米复合材料的制备及可见光催化性能 认领 引用 被引量：18
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作者 胡金娟 马春雨 +3 位作者 王佳琳 王宁 秦福文 张庆瑜 《复合材料学报》 EI CAS CSCD 北大核心 2020年第6期1401-1410,共10页
近年来,半导体光催化技术作为一项快速发展的新型环保技术,在降解水体中污染物和可再生清洁能源的生产领域有很大的应用前景。本文以所制备出的20 wt%类石墨烯碳氮化合物(g-C3N4)/TiO2为基质,利用水热法中纳米Ag颗粒部分氧化行为成功合... 近年来,半导体光催化技术作为一项快速发展的新型环保技术,在降解水体中污染物和可再生清洁能源的生产领域有很大的应用前景。本文以所制备出的20 wt%类石墨烯碳氮化合物(g-C3N4)/TiO2为基质,利用水热法中纳米Ag颗粒部分氧化行为成功合成了Ag修饰异质结型Ag-Ag2O/TiO2-g-C3N4复合材料。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、紫外-可见漫反射光谱(UV-Vis DRS)、光致荧光光谱(PL)、瞬态光电流响应等分析测试手段对Ag-Ag2O/TiO2-g-C3N4复合材料的晶体结构、形貌、光学性质等进行表征和分析。以亚甲基蓝溶液为目标降解物,研究了Ag-Ag2O/TiO2-g-C3N4复合材料的可见光催化性能。结果表明:在纳米Ag颗粒修饰的Ag-Ag2O/TiO2-g-C3N4复合材料中,Ag部分氧化成Ag2O;与g-C3N4的协同作用使Ag-Ag2O/TiO2-g-C3N4复合催化剂具有良好的可见光催化活性;可见光照射4 h后,AgAg2O/TiO2-g-C3N4复合催化剂对亚甲基蓝的降解率接近50%。 展开更多
关键词 g-C3N4/TiO2 Ag2O 贵金属 异质结 可见光催化
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Cu^2+改性g-C3N4光催化剂的光催化性能 认领 引用 被引量：18
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作者 李小为 王彬 +4 位作者 尹文轩 狄俊 夏杰祥 朱文帅 李华明 《物理化学学报》 SCIE CAS CSCD 北大核心 2020年第3期123-132,共10页
本文通过将Cu^2+掺入g-C3N4结构中成功制备了Cu/g-C3N4光催化剂,并进一步优化其光催化性能。同时,采用多种表征方法对Cu/g-C3N4光催化剂的结构、形貌、光学和光电性能进行了分析。X射线衍射(XRD)和X射线光电子能谱(XPS)结果表明制备的... 本文通过将Cu^2+掺入g-C3N4结构中成功制备了Cu/g-C3N4光催化剂,并进一步优化其光催化性能。同时,采用多种表征方法对Cu/g-C3N4光催化剂的结构、形貌、光学和光电性能进行了分析。X射线衍射(XRD)和X射线光电子能谱(XPS)结果表明制备的光催化剂为Cu/g-C3N4,且Cu的价态为+2。在可见光照射下,研究了不同铜含量的Cu/g-C3N4和gC3N4光催化剂的光催化活性。实验结果表明,Cu/g-C3N4光催化剂的降解能力显著高于纯相的g-C3N4。N2吸附-解吸等温线表明,Cu^2+的引入对g-C3N4的微观结构影响不大,说明光催化活性的提高可能与光生载流子的有效分离有关。因此,Cu/g-C3N4光催化降解RhB和CIP性能的提升可能是由于Cu^2+可以作为电子捕获陷阱从而降低了载流子的复合速率。通过光电测试表明,在g-C3N4中掺入Cu^2+可以降低g-C3N4的电子空穴复合速率,加速电子空穴对的分离,从而提高了其光催化活性。自由基捕获实验和电子自旋共振(ESR)结果表明,超氧自由基(O2·-)、羟基自由基(·OH)和空穴的协同作用提高了Cu/g-C3N4光催化剂的光催化活性。 展开更多
关键词 Cu/g-C3N4 光催化 可见光 活性物种 RhB CIP
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Photocatalytic H2 generation via CoP quantum-dot-modified g-C3N4 synthesized by electroless plating 认领 引用 被引量：18
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作者 Kezhen Qi Wenxiu Lv +1 位作者 Iltaf Khan Shu-yuan Liu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第1期114-121,共8页
Photocatalytic water splitting is a promising method for hydrogen production.Numerous efficient photocatalysts have been synthesized and utilized.However,photocatalysts without a noble metal as the co-catalyst have be... Photocatalytic water splitting is a promising method for hydrogen production.Numerous efficient photocatalysts have been synthesized and utilized.However,photocatalysts without a noble metal as the co-catalyst have been rarely reported.Herein,a CoP co-catalyst-modified graphitic-C3N4(g-C3N4/CoP)is investigated for photocatalytic water splitting to produce H2.The g-C3N4/CoP composite is synthesized in two steps.The first step is related to thermal decomposition,and the second step involves an electroless plating technique.The photocatalytic activity for hydrogen evolution reactions of g-C3N4 is distinctly increased by loading the appropriate amount of CoP quantum dots(QDs).Among the as-synthesized samples,the optimized one(g-C3N4/CoP-4%)shows exceptional photocatalytic activity as compared with pristine g-C3N4,generating H2 at a rate of 936μmol g^-1 h^-1,even higher than that of g-C3N4 with 4 wt%Pt(665μmol g^-1 h^-1).The UV-visible and optical absorption behavior confirms that g-C3N4 has an absorption edge at 451 nm,but after being composited with CoP,g-C3N4/CoP-4%has an absorption edge at 497 nm.Furthermore,photoluminescence and photocurrent measurements confirm that loading CoP QDs to pristine g-C3N4 not only enhances the charge separation,but also improves the transfer of photogenerated e--h+pairs,thus improving the photocatalytic performance of the catalyst to generate H2.This work demonstrates a feasible strategy for the synthesis of highly efficient metal phosphide-loaded g-C3N4 for hydrogen generation. 展开更多
关键词 Photocatalysis CoP quantum dots Electroless plating H2 generation g-C3N4
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