Fe^3＋ -doped nanometer TiO2 photocatalysts were prepared by sol-gel technique. TiO2 powders with different Fe^3＋ / Ti^4 ＋ molar ratios ranging from 0. 05% to 25% were synthesized by calcinating the gels in the temp...Fe^3＋ -doped nanometer TiO2 photocatalysts were prepared by sol-gel technique. TiO2 powders with different Fe^3＋ / Ti^4 ＋ molar ratios ranging from 0. 05% to 25% were synthesized by calcinating the gels in the temperature range of 200-600 ℃ . The effects of the content of iron ions and calcination temperature on the physical properties of the powders and their photocatalytic activities were examined by the photodecorapositon of methyl orange in sunlight. The results show that Fe dopant can decrease the temperature of nanatase-ratile transformation. The ideal photocatalytic property was achieved when the sample with an Fe^3＋ / Ti^4＋ ratio of 20 at% was calcined at about 300 ℃ for an hour, which is superior to that of commercial Degussa P-25. The optimum microstructure of the Fe-doped TiO2 for a high photocatalytic activity in sunlight is consisted of nanatase and ratile.展开更多
铁原子掺入氧化锌可大幅增加其光催化性能从而提高了除污能力.该文通过行星球磨结合高温固溶掺杂的方法制备Zn_(1-x)Fe_(x)O材料.通过紫外分光光度计,X射线粉末衍射实验和键弛豫理论,定量分析了Fe^(3+)掺杂对Zn-O键弛豫动力学及其光催...铁原子掺入氧化锌可大幅增加其光催化性能从而提高了除污能力.该文通过行星球磨结合高温固溶掺杂的方法制备Zn_(1-x)Fe_(x)O材料.通过紫外分光光度计,X射线粉末衍射实验和键弛豫理论,定量分析了Fe^(3+)掺杂对Zn-O键弛豫动力学及其光催化效率的影响.研究表明:当Fe^(3+)掺杂浓度为10%时,1 g Zn_(1-x)Fe_(x)O材料在2.5 h内,光降解亚甲基蓝可达到66%,比纯ZnO高出52%;掺杂浓度在10%以内时,Zn_(1-x)Fe_(x)O材料中Zn-O键的单键能和禁带宽度均随着Fe^(3+)掺杂浓度的增加而减小;定量获取了不同浓度下Zn-O键的配位数、单键能和禁带宽度.为Zn_(1-x)Fe_(x)O材料的制备及其光催化性能的定量研究提供了一种简单、易控且低成本的新方法.展开更多
基金Founded by the Science and Technology Foundation of AnhuiProvince (No.010301E2)
文摘Fe^3＋ -doped nanometer TiO2 photocatalysts were prepared by sol-gel technique. TiO2 powders with different Fe^3＋ / Ti^4 ＋ molar ratios ranging from 0. 05% to 25% were synthesized by calcinating the gels in the temperature range of 200-600 ℃ . The effects of the content of iron ions and calcination temperature on the physical properties of the powders and their photocatalytic activities were examined by the photodecorapositon of methyl orange in sunlight. The results show that Fe dopant can decrease the temperature of nanatase-ratile transformation. The ideal photocatalytic property was achieved when the sample with an Fe^3＋ / Ti^4＋ ratio of 20 at% was calcined at about 300 ℃ for an hour, which is superior to that of commercial Degussa P-25. The optimum microstructure of the Fe-doped TiO2 for a high photocatalytic activity in sunlight is consisted of nanatase and ratile.
文摘铁原子掺入氧化锌可大幅增加其光催化性能从而提高了除污能力.该文通过行星球磨结合高温固溶掺杂的方法制备Zn_(1-x)Fe_(x)O材料.通过紫外分光光度计,X射线粉末衍射实验和键弛豫理论,定量分析了Fe^(3+)掺杂对Zn-O键弛豫动力学及其光催化效率的影响.研究表明:当Fe^(3+)掺杂浓度为10%时,1 g Zn_(1-x)Fe_(x)O材料在2.5 h内,光降解亚甲基蓝可达到66%,比纯ZnO高出52%;掺杂浓度在10%以内时,Zn_(1-x)Fe_(x)O材料中Zn-O键的单键能和禁带宽度均随着Fe^(3+)掺杂浓度的增加而减小;定量获取了不同浓度下Zn-O键的配位数、单键能和禁带宽度.为Zn_(1-x)Fe_(x)O材料的制备及其光催化性能的定量研究提供了一种简单、易控且低成本的新方法.
