Nano YMn2O5 Visible-light-driven Semiconductor Photocatalyst

doi:10.3724/SP.J.1077.2011.01164

Abstract

Abstract: YMn₂O₅ nanoparticles were synthesized by a modified polyacrylamide Gel technique. X-ray diffraction (XRD) analysis indicated that the as-synthesized nanoparticles crystallized mostly into orthorhombic YMn₂O₅ phase and less into hexagonal YMn₂O₅ phase without the presence of any other impurities. Scanning electron microscope (SEM) observation showed that the prepared YMn₂O₅ nanoparticles were regularly spherical in shape and highly uniform in size with a diameter of about 45nm. Ultraviolet-visible diffuse reflectance spectroscopy was used to investigate the light-absorbing properties and bandgap of YMn₂O₅ nanoparticles, and the value of the optical bandgap energy was obtained to be 1.21eV. The photocatalytic activity of YMn₂O₅ nanoparticles was investigated by the degradation of Methyl red (MR), a typical azo dye. The experimental results revealed that the product exhibited a pronounced photocatalytic activity for the MR decomposition under ultraviolet and visible light irradiation. The optimum conditions for the photocatalytic degradation were determined to be as follows, initial concentration of MR, 15mg/L, catalyst dosage, 1.2g/L.

Key words: YMn₂O₅, nanoparticles, photocatalytic activity

CLC Number:

O469

WANG Shi-Fa, YANG Hua, XIAN Tao, WEI Zhi-Qiang, MA Jin-Yuan, FENG Wang-Jun. Nano YMn2O5 Visible-light-driven Semiconductor Photocatalyst[J]. Journal of Inorganic Materials, 2011, 26(11): 1164-1168.

References

[1] Mills A, Davies R H, Worsley D. Water purification by semiconductor photocatalysis. Chem. Soc. Rev. , 1993, 22(6): 417-425.

[2] Hoffmann M R, Martin S T, Choi W, et al. Environmental applications of semiconductor photocatalysis. Chem. Rev., 1995, 95(1): 69-96.

[3] 胡学斌, 徐璇, 吉芳英, 等(HU Xue-Bing, et al). 疏水性光催化剂的制备及其催化动力学. 无机材料学报(Journal of Inorganic Materials), 2009, 24(6): 1115-1120.

[4] 李辉, 王金淑, 李洪义, 等(LI Hui, et al). 氮硫掺杂介孔TiO2薄膜结构及其光催化性能. 无机材料学报(Journal of Inorganic Materials) , 2009 , 24(5): 909-914.

[5] 田宝柱, 李春忠, 顾锋, 等(TIAN Bao-Zhu, et al). 喷雾燃烧热分解制备Cr掺杂TiO2纳米粒子的可见光催化性能. 无机材料学报(Journal of Inorganic Materials), 2009, 24(4): 661-665.

[6] Shan Z C, Xia Y J, Yang Y X, et al. Preparation and photocatalytic activity of novel efficient photocatalyst Sr2Bi2O5. Mater. Lett., 2009, 63(1): 75-77.

[7] Zhang G Q, Chang N, Han D Q, et al. The enhanced visible light photocatalytic activity of nanosheet-like Bi2WO6 obtained by acid treatment for the degradation of rhodamine B. Mater. Lett., 2010, 64(19): 2135-2137.

[8] 戈磊, 张宪华(GE Lei, et al). 微乳液法合成新型可见光催化剂BiVO4及光催化性能研究. 无机材料学报(Journal of Inorganic Materials), 2009, 24(3): 453-456.

[9] Gao F, Chen X, Yin K, et al. Visible-light photocatalytic properties of weak magnetic BiFeO3 nanoparticles. Adv. Mater., 2007, 19(19): 2889-2892.

[10] Zhang M, Yang H, Xian T, et al. Polyacrylamide Gel synthesis and photocatalytic performance of Bi2Fe4O9 nanoparticles. J. Alloys Compd. , 2010, 509(3): 809-812.

[11] Inomata A, Kohn K. Pyroelectric effect and possible ferroelectric transition of helimagnetic GdMn2O5, TbMn2O5 and YMn2O5. J. Phys.: Condens. Matter, 1996, 8(15): 2673-2678.

[12] Kobayashi S, Osawa T, Kimura H, et al. Reinvestigation of simultaneous magnetic and ferroelectric phase transitions in YMn2O5. J. Phys. Soc. Jpn. , 2004 , 73(6): 1593-1596.

[13] Noda Y, Kimura H, Fukunaga M, et al. Magnetic and ferroelectric properties of multiferroic RMn2O5. J. Phys.: Condens. Matter, 2008, 20(43): 434206-1-3.

[14] 县涛, 杨华, 沈希, 等(XIAN Tao, et al). 聚丙烯酰胺凝胶法合成BiFeO3纳米颗粒. 无机材料学报(Journal of Inorganic Materials), 2010, 25(3): 251-254.

[15] 王仕发, 杨华, 县涛, 等(WANG Shi-Fa, et al). YMnO3纳米颗粒的制备与表征. 硅酸盐学报(Journal of the Chinese Ceramic Society), 2010, 38(12): 2303-2307.

[16] Ma C, Yan J Q, Dennis K W, et al. Effect of oxygen content on the magnetic properties of multiferroic YMn2O5+δ. J. Phys.: Condens. Matter, 2009, 21(34): 346002-1-5.

[17] Lin J G, Han T C, Chen C H. Structure-dependent magnetization in helimagnetic YMn2O5. IEEE Trans. Magn., 2005, 41(10): 3440-3442.

[18] Kubelka P, Munk F. Ein beitrag zur optik der farbanstriche. Z. Tech. Phys., 1931, 12: 593-601.

[19] Tauc J, Grigorovici R, Vancu A. Optical properties and electronic structure of amorphous germanium. Phys. Stat. Sol., 1966, 15(2): 627-637.

[20] Konstantinou I K, Albanis T A. TiO2-assisted photocatalytic degradation of azo dyes in aqueous solution: kinetic and mechanistic investigations. Appl. Cata. B: Environ., 2004, 49(1): 1-14.