CdS/YFeO_3新型磁性可见光催化剂的制备和性能研究
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摘要
采用共沉淀法,以Cd(NO_3)_2、二甲亚砜、Y_2O_3,HNO_3,Fe(NO_3)_3和柠檬酸为原料合成一系列不同掺杂比例的CdS/YFeO_3复合磁性光催化剂.用差热-热重、紫外可见漫反射、X射线衍射等技术对光催化剂进行了表征.X射线衍射结果表明CdS/YFeO_3复合磁性光催化剂制备成功.由差热-热重结果可知,CdS/YFeO_3复合磁性光催化剂的热稳定性高于纯CdS.紫外可见漫反射结果表明,Cd S/YFeO_3复合磁性光催化剂在紫外和可见光区的吸光度都比纯CdS大.通过罗丹明B的降解反应评价了该类光催化剂的活性.结果表明,CdS/YFeO_3的比例对光催化活性有明显影响.光催化循环实验结果显示,CdS/YFeO_3复合磁性光催化剂具有良好的回收性,首次回收率为92.08%.
A series of Cd S / YFeO_3 composite magnetic photocatalysts were synthetized by co-precipitation method using cadmium nitrate,dimethyl sulfoxide,antimony trioxide,nitric acid,ferric nitrate and citric acid as raw materials. They were characterized by techniques of TG-DTA,UV-vis diffuse reflection,FL,XRD and UV-vis. The XRD results indicate that the CdS / YFeO_3 composite magnetic photocatalysts are successfully prepared. The TG-DTA results indicate that the thermal stability of CdS / YFeO_3 composite magnetic photocatalysts is higher than that of pure CdS. The UV-vis diffuse reflection results indicate that the absorbance of the composite magnetic photocatalysts is higher than that of pure Cd S in ultraviolet-visible region. The photocatalytic activity of the photocatalysts is tested in degradation of rhodamine B visible light irradiation. The results show that the ratio of Cd S / YFeO_3 significantly affects the photocatalytic activity. The reusability results of photocatalytic experiments show that the Cd S / YFeO_3 composite photocatalysts can be easily recovered,and the recovery rate for the first cycle is 92. 08%.
A series of Cd S / YFeO_3 composite magnetic photocatalysts were synthetized by co-precipitation method using cadmium nitrate,dimethyl sulfoxide,antimony trioxide,nitric acid,ferric nitrate and citric acid as raw materials. They were characterized by techniques of TG-DTA,UV-vis diffuse reflection,FL,XRD and UV-vis. The XRD results indicate that the CdS / YFeO_3 composite magnetic photocatalysts are successfully prepared. The TG-DTA results indicate that the thermal stability of CdS / YFeO_3 composite magnetic photocatalysts is higher than that of pure CdS. The UV-vis diffuse reflection results indicate that the absorbance of the composite magnetic photocatalysts is higher than that of pure Cd S in ultraviolet-visible region. The photocatalytic activity of the photocatalysts is tested in degradation of rhodamine B visible light irradiation. The results show that the ratio of Cd S / YFeO_3 significantly affects the photocatalytic activity. The reusability results of photocatalytic experiments show that the Cd S / YFeO_3 composite photocatalysts can be easily recovered,and the recovery rate for the first cycle is 92. 08%.
引文
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[2]Asahi R,Morikawa T,Ohwaki T,et al.Visible-light photocatalysis in Nitrogen-Doped titanium oxides[J].Science,2001,293:269-271.
[3]Irie H,Watanabe Y,Hashimoto K,et al.Nitrogen-concentration dependence on photocatalytic activity of Ti O2-x Nx powders[J].Journal of Physical Chemistry B,2003,107:5483-5486.
[4]Wang Y,Yu X J,Yang H J,et al.Effect of crystal structure of Ti O2on its N species and photocatalytic activity[J].Chinese Journal of Inorganic Chemistry,2006,22:771-774.
[5]陈旬,梁诗景,毕进红,等.自生长燃烧法合成纳米铁酸钇固溶体光催化剂[J].无机化学学报,2009,25(11):1922-1927.
[6]Lv X M,Xie J M,Shu H M,et al.Microwave-assisted synthesis of nanocrystalline YFe O3and study of its photoactivity[J].Materials Science and Engineering B,2007,138:289-292.
[7]Zhang Y W,Yang J X,Xu J F,et al.Controllable synthesis of hexagonal and orthorhombic YFe O3and their visible-light photocatalytic activities[J].Materials Letters,2012,81:1-4.
[8]Wu A H,Shen H,Xu J Y,et al.Growth and property of new type magneto-optical YFe O3crystal[J].Chinese Journal of Inorganic Chemistry,2008,5:1001-3830.
[9]Zhou F,Ma Q,Tang Y P,et al.Nuclear energy research and design institute[J].Journal of Tsinghua University,2004,331:1001-4381.
[10]Meng Z D,Peng M M,Lei Z,et al.Fullerene modification Cd S/Ti O2to enhancement surface area and modification of photocatalytic activity under visible light[J].Applied Catalysis B:Environmental,2012,113:141-149.
[11]汤国虎.纳米硫化镉的最新研究进展[J].中国陶瓷,2009,11(11):1001-9642.
[12]曹洁明,房宝青,刘劲松,等.微波固相反应制备Cd S纳米粒子[J].无机化学学报,2005,21(1):105-108.
[13]Pan X,Zhu J W,Wang X.Cadmium sulfideferrite nanocomposite as a magnetically recyclable photocatalyst with enhanced visible-light-driven photocatalytic activity and photostability[J].Industrial and Engineering Chemistry Research,2013,52:17126-17133.