Fe(Ⅲ)团簇表面修饰Bi_2WO_6及其界面电子转移增强催化性能机制
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摘要
采用水热法制备了分级结构的Bi_2WO_6微球,在此基础上采用回流法将Fe(Ⅲ)沉积在其表面,获得了系列Fe(Ⅲ)修饰的Fe(Ⅲ)/Bi_2WO_6催化材料,采用XRD、UV-Vis-DRS、SEM等测试技术对其组成、形貌和能带结构进行表征分析。以偶氮染料罗丹明B (RhB)为模拟污染物对其活性进行测试。活性测试结果表明,Fe(Ⅲ)表面修饰增强了Bi_2WO_6光催化剂RhB的对吸附对能力,提高了光生电子-空穴的分离能力并有效拓宽了Bi_2WO_6光催化材料对可见光的吸收范围,促进了·OH和·O_2~-的产生,Fe(Ⅲ)/Bi_2WO_6的催化活性比Bi_2WO_6增强了约2. 4倍。
Hierarchical Bi_2WO_6 microspheres were prepared by hydrothermal method. Fe( Ⅲ) was deposited on its surface by a following reflux method. The resulted Fe( Ⅲ)/Bi_2WO_6 catalytic materials were characterized by XRD,UV-Vis-DRS,SEM to investigate its composition,morphology and band structure. Rhodamine B( RhB) was selected as model pollutant to evaluate the photocatalytic activity of as-prepared Fe( Ⅲ)/Bi_2WO_6 photocatalysts.The results revealed that Fe( Ⅲ) loading significantly enhance the adsorption ability of Bi_2WO_6 photocatalyst,improve the separation ability of photogenerated electrons and holes,broaden the visible-light responsive region as well. Furthermore,Fe( Ⅲ) loading promote the generation of both ·OH and ·O_2~-. The photocatlaytic activity experimental results show that the catalytic activity of Fe( Ⅲ)/Bi_2WO_6 is about 2. 4 times higher than that of Bi_2WO_6 for photocatalytic degradation of Rhodamine B.
Hierarchical Bi_2WO_6 microspheres were prepared by hydrothermal method. Fe( Ⅲ) was deposited on its surface by a following reflux method. The resulted Fe( Ⅲ)/Bi_2WO_6 catalytic materials were characterized by XRD,UV-Vis-DRS,SEM to investigate its composition,morphology and band structure. Rhodamine B( RhB) was selected as model pollutant to evaluate the photocatalytic activity of as-prepared Fe( Ⅲ)/Bi_2WO_6 photocatalysts.The results revealed that Fe( Ⅲ) loading significantly enhance the adsorption ability of Bi_2WO_6 photocatalyst,improve the separation ability of photogenerated electrons and holes,broaden the visible-light responsive region as well. Furthermore,Fe( Ⅲ) loading promote the generation of both ·OH and ·O_2~-. The photocatlaytic activity experimental results show that the catalytic activity of Fe( Ⅲ)/Bi_2WO_6 is about 2. 4 times higher than that of Bi_2WO_6 for photocatalytic degradation of Rhodamine B.
引文
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[29]王丹军,岳林林,郭莉,等.多孔结构Bi2WO6光催化剂的制备及其模拟燃油催化氧化脱硫活性[J].无机材料学报,2013,28(10):1079-1086.
[30]王丹军,张洁,郭莉,等.基于能带结构理论的半导体光催化材料改性策略[J].无机材料学报,2015,30(7):683-693.
[2]Fu H,Pan C,Yao W,et al. Visible-light-induced degradation of Rhodamine B bynanosized Bi2WO6[J]. The Journal of Physical Chemistry B,2005,109(47):22432-22439.
[3]Zhang J,Zhu H,Zheng S,et al. Ti O2film/Cu2O microgrid heterojunction with photocatalytic activity under solar light irradiation[J]. ACS Applied Materials&Interfaces,2009,1(10):2111-2114.
[4]Tang J W,Zou Z G,Ye J H. Photocatalytic decomposition of organic contaminants by Bi2WO6under visible light irradiation[J]. Catal. Lett.,2004,92(2):53-56.
[5]杨英杰,陈建林,王仪春,等. Bi2WO6催化剂的合成和表征及其光催化活性[J].化工环保,2007,27(6):501-505.
[6]Zhou Lin,Wang W Z,Zhang L. Ultrasonic-assisted synthesis of visible-light-induced Bi2MO6(M=W,Mo)photocatalysts[J]. Journal of Molecular Catalysis A-Chemical,2007,268(1-2):195-200.
[7]陈磊,吴大雄,朱海涛.醇水混合溶剂中制备钨酸铋中空纳米结构[J].青岛科技大学学报(自然科学版),2012,33(1):9-12.
[8]Obregon A S,Martinez-de la Cruz A. Synthesis,characterization and visible-light photocatalytic properties of Bi2WO6and Bi2W2O9obtained by co-precipitation method[J]. Applied Catalysis-General,2010,383(1-2):128-133.
[9]Zhang G K,Lue F,Li M,et al. Synthesis of nanometer Bi2WO6synthesized by sol-gel method and its visiblelight photocatalytic activity for degradation of 4BS[J]. Journal of Physics and Chemistry of Solids,2010,71(4):579-582.
[10]余姝洁,李名,张水明,等.水热法在纳米光催化剂制备中的应用[J].环境科学与技术,2009,32(B12):213-215.
[11]Fu H B,Zhang L W,Yao W Q,et al. Photocatalytic properties of nanosized Bi2WO6catalysts synthesized via a hydrothermal process[J]. Applied Catalysis B-Environmental,2006,66(1-2):100-110.
[12]Zhang L S,Wang H L,Chen Z G,et al. Bi2WO6micro/nano-structures:Synthesis,modifications and visible-lightdriven photocatalytic applications[J]. Applied Catalysis B-Environmental,2011,106(1-2):1-13.
[13]尹璐.钨酸铋的制备、改性以及光催化性能的研究[D].石家庄:河北师范大学,2017.
[14]祝大伟,尚鸣,顾万建,等.水热法在材料合成中的应用及其发展趋势[J].硅谷,2014,17:126.
[15]茆慧玲,孙浩楠. Bi2WO6纳米管的制备及其可见光催化性能研究[J].哈尔滨师范大学学报,2015,31(6):64-67.
[16]Shang M,Wang W Z,Ren J,et al. A practical visiblelight-driven Bi2WO6nanofibrous matprepa red by electrospinning[J]. Journal of Materials Chemistry,2009,19(34):6213-6218.
[17]Wu L,Bi J H,Li Z H,et al. Rapid preparation of Bi2WO6photocatalyst with nanosheet morphology via microwaveassisted solvothermal synthesis[J]. Catalysis Today,2008,131(1):15-20.
[18]Zhang C,Zhu Y. Synthesis of square Bi2WO6nanoplates as high-activity visible-light-driven photocatalysts[J].Chem. Mater.,2005,17(13):3537-3545.
[19]Fu H,Pan C,Yao W,et al. Visible-light-induced degradation of Rhodamine B by nanosized Bi2WO6[J]. The Journal of Physical Chemistry B,2005,109(47):22432-22439.
[20]代威力.钨酸铋形貌调控、改性及其光催化还原CO2性能研究[D].南昌:南昌航空大学,2015.
[21]Amano F,Nogami K,Abe R,et al. Preparation and characterization of bismuth tungstate polycrystalline flake-ball particles for photocatalytic reactions[J]. The Journal of Physical Chemistry C,2008,112(25):9320-9326.
[22]朱振峰,于红光,李军奇,等.无助剂一步合成巢状钨酸铋微球及其光催化性能的研究[J].功能材料,2012,43(4):409-412.
[23]段芳,张琴,魏取福,等.铋系半导体光催化剂的光催化性能调控[J].化学进展,2014,26(1):30-40.
[24]Yu H G,Irie H,Hashimoto K. Conduction Band Energy Level Control of Titanium Dioxide:Toward an Ef cient Visible-Light-Sensitive Photocatalyst[J]. Journal of American Society Chemistry,2010,132(20):6898-6899.
[25]Liu M,Qiu X Q,Miyauchi M,et al. Energy-Level Matching of Fe(Ⅲ)Ions Grafted at Surface and Doped in Bulk for Efficient Visible-Light Photocatalysts[J]. Journal of American Society Chemistry,2013,135(27):10064-10072.
[26]Yu H G,Chen W Y,Wang X F,et al. Enhanced photocatalytic activity and photoinduced stability of Ag-based photocatalysts:The synergistic action of amorphous-Ti(IV)and Fe(Ⅲ)cocatalysts[J]. Applied Catalysis B:Environmental,2016,187:163-170.
[27]Liu Q,Chen T X,Guo Y R,et al. Grafting Fe(Ⅲ)species on carbon nanodots/Fe-doped g-C3N4via interfacial charge transfer effect for highly improved photocatalytic performance[J]. Applied Catalysis B:Environmental,2017,205:173-181.
[28]Shen H D,Xue W W,Fu F,et al. Efficient Degradation of Phenol and 4-Nitrophenol by Surface Oxygen Vacancies and Plasmonic Silver Co-Modified Bi2MoO6Photocatalysts[J]. Chemistry-A European Journal,2018,24,18463-18478.
[29]王丹军,岳林林,郭莉,等.多孔结构Bi2WO6光催化剂的制备及其模拟燃油催化氧化脱硫活性[J].无机材料学报,2013,28(10):1079-1086.
[30]王丹军,张洁,郭莉,等.基于能带结构理论的半导体光催化材料改性策略[J].无机材料学报,2015,30(7):683-693.