热处理对锐钛矿/金红石混晶TiO_2质量分数及光催化性能的影响
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摘要
采用溶胶凝胶法制备锐钛矿/金红石混合晶型TiO_2,通过晶体结构、表面形貌、元素组成以及光催化性能分析研究热处理对锐钛矿/金红石混晶TiO_2质量分数以及光催化性能的影响。实验结果表明:热处理温度升高以及保温时间延长都能促进锐钛矿向金红石转变,使金红石含量增加;混晶TiO_2的光催化性能高于单一的锐钛矿和金红石TiO_2;550℃保温3 h样品有最佳的光催化性能,其锐钛矿的质量分数为40%,金红石质量分数为60%,反应3 h后对罗丹明B的降解率达到84.1%。
The anatase/rutile mixed-phase TiO_2 powders were prepared by sol-gel method and the crystal structure,surface morphology and element composition of the samples were tested. The effect of heat treatment on anatase/rutile weight ratio of the mixed-phase TiO_2 and their photocatalytic properties were also studied. The experimental results show that the increasing heat treatment temperature and holding time can enhance the content of rutile phase and promote the transformation from anatase to rutile. The photocatalytic property of mixed crystal TiO_2 is higher than that of single anatase or rutile TiO_2. The sample heat treated at 550 ℃ for 3 h shows the best photocatalytic activity which consists of 40% anatase and 60% rutile. The degradation rate of rhodamine B is 84. 1% after 3 h.
The anatase/rutile mixed-phase TiO_2 powders were prepared by sol-gel method and the crystal structure,surface morphology and element composition of the samples were tested. The effect of heat treatment on anatase/rutile weight ratio of the mixed-phase TiO_2 and their photocatalytic properties were also studied. The experimental results show that the increasing heat treatment temperature and holding time can enhance the content of rutile phase and promote the transformation from anatase to rutile. The photocatalytic property of mixed crystal TiO_2 is higher than that of single anatase or rutile TiO_2. The sample heat treated at 550 ℃ for 3 h shows the best photocatalytic activity which consists of 40% anatase and 60% rutile. The degradation rate of rhodamine B is 84. 1% after 3 h.
引文
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[13]LI G H,CISTON S,SAPONJIC Z,et al.Synthesizing mixed-phase Ti O2nanocomposites using a hydrothermal method for photooxidation and photoreduction applications[J].Journal of Catalysis,2008,253(1):105-110.
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[2]LIN H J,YANG T S,HSI C S,et al.Optical and photocatalytic properties of Fe3+-doped Ti O2thin films prepared by a sol-gel spin coating[J].Ceramics International,2014,40(7):10633-10640.
[3]孙怀宇,房威,李雪.铅-二氧化钛薄膜的制备与光催化性能研究[J].无机盐工业,2014,46(9):75-78.
[4]YEUNG K L,YAU S T,MAIRA A J,et al.The influence of surface properties on the photocatalytic activity of nanostructured Ti O2[J].Journal of Catalysis,2003,219(1):107-116.
[5]GOLUBOVIC A,SCEPANOCIC M.Raman study of the variation in anatase structure of Ti O2nanopowders due to the changes of solgel synthesis conditions[J].Journal of Sol-Gel Science and Technology,2009,49(3):311-316.
[6]CHETIA L,KALITA D,AHMED G A.Enhanced photocatalytic degradation by diatom templated mixed phase titania nanostructure[J].Journal of Photochemistry and Photobiology A:Chemistry,2017,338:134-145.
[7]LIU B T,PENG L L.Facile formation of mixed phase porous Ti O2nanotubes and enhanced visible-light photocatalytic activity[J].Journal of Alloys and Compounds,2013,571:145-152.
[8]LIKODIMOS V,CHRYSI A,CALAMIOTOU M,et al.Microstructure and charge trapping assessment in highly reactive mixed phase Ti O2photocatalysts[J].Applied Catalysis B:Environmental,2016,192:242-252.
[9]姜中生,姚超,刘文杰,等.海胆状混晶型Ti O2的制备及其光催化性能[J].化工新型材料,2015,43(7):154-157.
[10]张晓,解英娟,马佩军,等.物理混合法制备分级混晶Ti O2微纳米材料及其光催化性能[J].高等学校化学学报,2015,36(10):1977-1983.
[11]KIM C S,KWON I M,MOON B K,et al.Synthesis and particle size effect on the phase transformation of nanocrystalline Ti O2[J].Materials Science and Engineering C,2007,27(5-8):1343-1346.
[12]UVAROV V,POPOV I.Metrological characterization of Xray diffraction methods for determination of crystallite size in nano-scale materials[J].Materials Characterization,2007,58(10):883-891.
[13]LI G H,CISTON S,SAPONJIC Z,et al.Synthesizing mixed-phase Ti O2nanocomposites using a hydrothermal method for photooxidation and photoreduction applications[J].Journal of Catalysis,2008,253(1):105-110.
[14]SHAFAEI A,NIKAZAR M,ARAMI M.Photocatalytic degradation of terephthalic acid using titania and zinc oxide photocatalysts:comparative study[J].Desalination,2010,252(1-3):8-16.
[15]HUANG D G,LIAO S J,ZHOU W B,et al.Synthesis of samarium and nitrogen co-doped Ti O2by modified hydrothermal method and its photocatalytic performance for the degradation of 4-chlorophenol[J].Journal of Physics and Chemistry of Solids,2009,70(5):853-859.