引用本文:周颜霞,甘小蓉,薛红波,韩书文,侯建华,封克,王小治,等.Fe2O3/TiO2负载膨胀珍珠岩光催化降解罗丹明B[J].环境科学研究,2017,30(12):1961-1969.
ZHOU Yanxia,GAN Xiaorong,XUE Hongbo,HAN Shuwen,HOU Jianhua,FENG Ke,WANG Xiaozhi,et al.Photocatalytic Degradation of Rhodamine B by Fe2O3/TiO2 Coated Expanded Perlite[J].Reserrch of Environmental Science,2017,30(12):1961-1969.]
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Fe2O3/TiO2负载膨胀珍珠岩光催化降解罗丹明B
周颜霞1, 甘小蓉1, 薛红波1, 韩书文1, 侯建华1,2, 封克1,2, 王小治1,2
1. 扬州大学环境科学与工程学院, 江苏 扬州 225127;2. 江苏省有机固体废弃物资源化协同创新中心, 江苏 南京 210095
摘要:
为获得高效催化活性的光催化材料,研究不同煅烧氛围对材料在可见光下催化性能的影响,以膨胀珍珠岩(EP)为载体,采用溶胶-凝胶法,在不同煅烧氛围(O2和/或NH3)下制备Fe2O3/TiO2负载EP的光催化复合材料〔Fe2O3-TEP(O2)、Fe2O3-TEP(NH3)、Fe2O3-TEP(O2,NH3)、Fe2O3-TEP(NH3,O2)〕,采用EDS(X-射线色散能谱)、BET(比表面积及孔径分析)、XRD(X射线衍射)、SEM(扫描电子显微镜)、XPS(X射线光电子能谱)等对复合材料进行表征,并研究了其在可见光下对罗丹明B的光催化降解效果.结果表明:①复合材料成功负载了Ti、Fe元素,负载的TiO2以锐钛矿型存在,Fe2O3的掺杂增强了TiO2对可见光的响应能力;②不同的煅烧氛围明显影响复合材料的晶粒尺寸、比表面积和光催化性能,其中,Fe2O3-TEP(O2,NH3)的光催化性能最好,4 h后罗丹明B降解率达到87.59%,Fe2O3-TEP(NH3,O2)、Fe2O3-TEP(O2)和Fe2O3-TEP(NH3)4 h后对罗丹明B的降解率则分别为65.02%、62.48%和47.48%;③在试验条件下,复合材料的光催化反应符合一阶反应动力学方程,Fe2O3-TEP(O2,NH3)、Fe2O3-TEP(NH3,O2)、Fe2O3-TEP(O2)和Fe2O3-TEP(NH3)相应的降解速率常数分别为0.008 3、0.004 3、0.004 3和0.002 7 min-1.研究显示,通过溶胶-凝胶法所制备的复合材料(Fe2O3-TEP)经煅烧后所得矿相均一;Fe2O3掺杂TiO2可形成Ti—O—Fe键,减小TiO2固有的禁带宽度;复合材料光催化性能也受到煅烧氛围的影响,先O2后NH3煅烧条件下所得材料的光催化性能最佳.
关键词:  Fe2O3  TiO2  煅烧氛围  光催化  罗丹明B
DOI:10.13198/j.issn.1001-6929.2017.03.29
分类号:X51
基金项目:国家自然科学基金项目(51602281);江苏省重点研发计划-社会发展项目(BE2015661);江苏省环境材料与环境工程重点实验室项目
Photocatalytic Degradation of Rhodamine B by Fe2O3/TiO2 Coated Expanded Perlite
ZHOU Yanxia1, GAN Xiaorong1, XUE Hongbo1, HAN Shuwen1, HOU Jianhua1,2, FENG Ke1,2, WANG Xiaozhi1,2
1. College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China;2. Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China
Abstract:
In order to obtain photocatalytic materials with better catalytic activity and study the influence of different calcination atmosphere on photocatalytic properties of materials under visible light, expanded perlite was used to support nano Fe2O3/TiO2 photocatalysts (Fe2O3-TEP (O2), Fe2O3-TEP(NH3), Fe2O3-TEP(O2, NH3) and Fe2O3-TEP(NH3, O2)). The nanocomposites were calcinated in oxygen and/or ammonia atmosphere. The as-prepared materials were characterized by X-ray dispersive spectrometer (EDS), specific surface area and pore size analyzer (BET), X-ray diffraction (XRD), scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). The photocatalytic degradation of Rhodamine B (RhB) was examined with visible light irradiation. The results confirmed that both anatase and Fe oxides were present in the nanocomposites. The batch catalytic experiment revealed that the Fe2O3 increased photolytic capacity of TiO2 under visible light exposure. The calcination conditions greatly affected the crystallite size, specific surface area and the photocatalytic properties of the as-prepared materials. The calcination with oxygen and ammonia yielded the most capable catalyst, with a highest degradation rate of 87.59% after 4 hours. The results of Fe2O3-TEP(NH3, O2), Fe2O3-TEP(O2) and Fe2O3-TEP(NH3) were 65.02%, 62.48% and 47.48%, respectively. The RhB degradation followed the first order kinetic model under experimental conditions, and the corresponding degradation rate constants of Fe2O3-TEP(O2,NH3),Fe2O3-TEP(NH3,O2),Fe2O3-TEP(O2) and Fe2O3-TEP(NH3) were 0.0083, 0.0043, 0.0043 and 0.0027 min-1, respectively. This study showed that the composites (Fe2O3-TEP) prepared by sol-gel method were anatase after calcination. Fe2O3 doped TiO2 formed Ti-O-Fe bond narrowed band gap of TiO2. The photocatalytic property of composites was also affected by the calcination atmosphere;the optimum condition for calcination was O2 followed by NH3.
Key words:  Fe2O3  TiO2  calcination atmosphere  photocatalysis  Rhodamine B