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铈和锰掺杂纳米TiO₂的溶胶-凝胶法制备及其光催化性能

Preparation of TiO₂ doped with Mn²⁺ and Ce⁴⁺ by sol-gel method and their photocatalytic behaviors

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【Author】 SUN Jianfei1,2*,ZHAI Yuchun1,GU Hengda2,SHI Zhaoxin2,QIU Xinghua2(1.School of Material and Metallurgy,Northeastern University,Shenyang 110004,Liaoning,China;2.School of Applied Chemistry,Shenyang Institute of Chemical Technology,Shenyang 110142,Liaoning,China)

【机构】东北大学材料与冶金学院；沈阳化工学院应用化学学院；东北大学材料与冶金学院辽宁沈阳110004；辽宁沈阳110142；辽宁沈阳110004；

【摘要】采用溶胶-凝胶法制备了TiO2、Mn4+/TiO2、Ce4+/TiO2和Mn4+-Ce4+/TiO2光催化剂。通过考察掺杂离子的种类和用量对所得催化剂用于紫外光催化降解甲基橙性能的影响,表明Ce4+/TiO2中Ce4+的适宜掺杂量为1.0%,Ce4+-Mn4+/TiO2中,当Mn4+的掺杂量为25.0%时,Ce4+的适宜掺杂量为0.50%,相应的脱色效率为92.39%和99.41%。当掺杂量适当时,四种催化剂用于紫外光催化降解甲基橙的活性次序为:Mn4+-Ce4+/TiO2>TiO2>Ce4+/TiO2>Mn4+/TiO2。XRD分析结果表明,所得光催化剂均为锐钛矿型纳米粒子。更多还原

【Abstract】 TiO₂,Mn4+/TiO₂,Ce4+/TiO₂ and Ce4+-Mn4+/TiO₂ photocatalysts were prepared by sol-gel method and their behaviors in decoloration of methylene blue under ultraviolet irradiation investigated.The proper doping amount for Mn4+,Ce4+ and Mn4+-Ce4+ in titania were investigated.The proper Ce4+ amount in Ce4+/TiO₂ was 1.0%,with decoloration efficiency of 92.39%;the proper Ce4+ amount in Ce4+-Mn4+/TiO₂ was 0.50% while the amount of Mn4+ was 25.0%,with decoloration efficiency of 99.41%.The photocatalytic activity declined in the following order: Mn4+-Ce4+/TiO₂>TiO₂ >Ce4+/TiO₂>Mn4+/TiO₂.The XRD results showed that the photocatalysts obtained were all nanoparticles with anatase structure.更多还原