|
|
|
|
|
|
Preparation, Characterization and Properties of BiOCl1-xIx and BiOBr1-xIx Solid Solution |
YE Ping, WU Miao-miao, WEI Ming, YANG Zhen, HAN Qiao-feng* |
Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, China |
|
|
Abstract The usage of semiconductor photocatalysts for removal of contaminants is one of the greenest and most effective methods under sunlight, whose core is obtaining high-efficient photocatalysts. The most widely studied photocatalysts are TiO2, ZnO, etc., but they cannot fully utilize sunlight due to their large band gapenergy, thus limiting their practical use. In addition to modifying TiO2 to improve its visible light catalytic activity, the development of other materials as photocatalysts is also an important solution. Bismuth based compound semiconductors have become important research objects for their abundant raw materials, various types, good solar response and excellent photocatalytic activity. Bismuth oxyhalide compounds [BiOX, X=Cl, Br, I] exhibit excellent photocatalytic activity owning to layered structure, but they still have low photocatalytic efficiency when used alone. However, their photocatalytic degradation efficiency could be improved by preparing solid solutions (a mixture of solids that are molecularly dispersed with each other). In this work, a low-temperature wet chemical method can be used to obtain solid solutions BiOCl1-xIx and BiOBr1-xIx with sheet like structures, which is prepared by the reaction of a certain proportion of KI/KBr or KI/KCl aqueous solution with Bi2O3/HAc solution for half an hour at room temperature. X-ray diffraction (XRD) patterns showed that the synthesized BiOCl1-xIx and BiOBr1-xIx samples have good crystallinity and can form a solid solution in the range of x=0~1. The prepared solid solution was found to have an irregular sheetlike shape by a transmission electron microscope (TEM). X-ray photoelectron spectroscopy (XPS) tests further demonstrate their surface element composition and chemical state. Ultraviolet-visible diffuse reflectance spectroscopy (DRS) analysis indicates the red-shifted absorption edge of the solid solution and decreased band gap energy as the iodine content increased, so the visible light absorption capacity is enhanced and the number of generated carriers is agumented. The photocatalytic tests of MO degradation under visible light excitation manifest that BiOCl0.25I0.75 and BiOBr0.25I0.75 exhibit the highest photocatalytic activity. Cyclic experiments show that BiOCl0.25I0.75 and BiOBr0.25I0.75 have high stability. Photocatalytic mechanism studies show that the active species in the photocatalytic degradation of MO in these bismuth oxyhalide samples were holes and superoxide ion radicals. Combined with their energy band structures, it is believed that the formation of solid solution not only increases the visible light absorption capacity, but also modulates its energy band structure. Compared with BiOI, the formation of solid solution lowers the valence band position and raises the conduction band position. Therefore, the reducing ability of the photogenerated electrons and the oxidizing ability of the holes are enhanced, so that the catalytic performance is improved. The novelty of this work is low-temperature solid solution preparation, which avoids hydrothermal method or the addition of surfactants. Furthermore, the prepared BiOCl1-xIx and BiOBr1-xIx solid solutions, especially BiOCl0.25I0.75 and BiOBr0.25I0.75, have excellent photocatalytic degradation ability for MO under visible light excitation. Moreover, the catalysts have good stability, so it is expected to be applied in environmental management.
|
Received: 2018-06-28
Accepted: 2018-11-05
|
|
Corresponding Authors:
HAN Qiao-feng
E-mail: hanqiaofeng@njust.edu.cn
|
|
[1] XUE Juan-qin, DAI Ji-zhe, WANG Zhen-xing, et al(薛娟琴,代继哲,王真星,等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2018, 38(4): 1219.
[2] AN Wei-jia, CUI Wen-quan, LIU Li, et al(安伟佳,崔文权,刘 利,等). Journal of Molecular Catalysis(分子催化), 2013, 27(5): 483.
[3] Wang D H, Gao G Q, Zhang Y W, et al. Nanoscale, 2012, 4(24): 7780.
[4] Peng S, Li L, Zhu P, et al. Chemistry An Asian Journal, 2013, 8(1): 258.
[5] Barka N, Qourzal S, Assabbane A, et al. Chemical Engineering Communications, 2011, 198(10): 1233.
[6] Dong F, Sun Y, Fu M, et al. Journal of Hazardous Materials, 2012, 219-220(6): 26.
[7] Lin H, Ye H, Li X, et al. Ceramics International, 2014, 40(7): 9743.
[8] Jiang Y R, Lin H P, Chung W H, et al. Journal of Hazardous Materials, 2015, 283: 787.
[9] Zhang J, Xia J, Yin S, et al. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2013, 420(9): 89.
[10] Cao J, Xu B, Luo B, et al. Catalysis Communications, 2011, 13(1): 63.
[11] Gnayem H, Sasson Y. ACS Catalysis, 2013, 3: 186.
[12] Han Q, Yang Z, Wang L, et al. Applied Surface Science, 2017, 403: 103. |
[1] |
YANG Chang-hu, YUAN Jian-hui. Effects of Thickness on Spectral Properties of Undoped ZnO Thin Films[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(09): 2835-2838. |
[2] |
TANG Gu-hua, ZHANG Hui, SUN Xin-yuan, XU Meng, OUYANG Jian-ming*. Differences in Adsorption of Anionic Surfactant AOT by Calcium Oxalate Dihydrate With Different Morphologies[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(04): 1079-1085. |
[3] |
HUANG Wei-bo, CHEN Jia-yun, HUANG Fang, HUANG Li-shan, OUYANG Jian-ming*. Effects of Different Molecular Weight of Gracilaria Lemaneiformis Polysaccharide on Calcium Oxalate Crystal[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(04): 1163-1170. |
[4] |
ZHANG Guo-fang1, ZHAI Ting-ting1, HOU Zhong-hui1, XU Jian-yi1, WU Yue1, GE Qi-lu2. Research on the Influence of Spectrum Characteristics on the Catalysis Effect of Nanosized CeO2-xNx Solid Solutions[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(10): 3192-3198. |
[5] |
XUE Juan-qin1, DAI Ji-zhe2, WANG Zhen-xing1, LI Di1. Spectral Characteristic of Graphene Modified Zinc Stannate Materials and It’s Photocatalytic Properties[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(04): 1219-1224. |
[6] |
FAN Zhi-dong1, LIU Chuo2, LI Xu3, MA Lei2*, PENG Ying-cai2. The Preparation and Blue Light Emission Characteristic of Ce-Doped Si Nanowires[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(01): 281-284. |
[7] |
ZHANG Jin-hao1, LIU Chuo1, LI Wan1, HAO Xiao1, WU Yi3, FAN Zhi-dong1, LIU Lei1, 2, MA Lei1, 2*. Photoluminescence Properties of Y Doped Si Nanowires[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2017, 37(05): 1357-1362. |
[8] |
WANG Zhen-xing, XUE Juan-qin, LI Di. Studies on the Ionic Liquid-Assisted Hydrothermal Synthesis of Zn2SnO4[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2017, 37(04): 1198-1204. |
[9] |
FAN Zhi-dong1, ZHOU Zi-chun2, LIU Chuo2, MA Lei2*, PENG Ying-cai2 . Study on the Photoluminescence Properties of Tb Doped Si Nanowires [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2016, 36(07): 2055-2058. |
[10] |
LI Zhen-ya, HUANG Shi-ming*, GU Mu, LIU Xiao-lin. Preparation and Photoluminescent Properties of Ce3+-Activated LaPO4 Nanocrystals and Core/Shell Structure[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(11): 3036-3040. |
[11] |
HUANG Si-si, ZHANG Xu, QIAN Sha-hua* . Preconcentration of Trace Cu(Ⅱ) in Water Samples with Nano-Sized ZnO and Determination by GFAAS [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(09): 2420-2423. |
[12] |
LI Zhao1, ZHAO Xi-cheng2*, CHEN Li-jun3, JIANGYuan-ru3, LUO Lei2 . Contrastive Research of the Y3Al5O12: Ce3+ Yellow Phosphors Prepared by Different Methods[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(03): 695-699. |
[13] |
WANG Yue-hui1, XIONG Na-na2, ZHOU Ji3 . Fluorescence Enhancement Effect of Silver Nanoparticles with Different Surface Modifiers and Sizes [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(12): 3292-3296. |
[14] |
TAO Dong-liang1, 3, ZHANG Kun1, ZHANG Hong1, CUI Yu-min1, 3, XU Yi-zhuang2*, LIU Yu-hai2 . Study on Synthesis and Matching Degree of Energy Level of Terbium Complexes Using o-Fluoro-Benzoic Acid as Ligand [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(04): 994-998. |
[15] |
. Mechanism of Gold Solid Extraction from Aurocyanide Solution Using D3520 Resin Impregnated with TRPO [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(02): 483-488. |
|
|
|
|