N掺杂纳米TiO_2-凹凸棒土复合材料的N掺杂形式和机理
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摘要
采用水解沉淀法,通过在制备过程中引入氮源制备N掺杂纳米TiO2-凹凸棒土复合材料,采用紫外-可见分光光度计分析材料的吸收光谱和禁带宽度,结合红外光谱、X射线光电子能谱的表征结果分析复合材料的N掺杂形式和机理。结果表明,N以TiN、NHx、NOx的混合形式进入TiO2晶体;TiO2晶体的禁带宽度减小0.58 eV,复合材料的吸收光谱发生红移,可吸收的光波长阈值提高105.35 nm。
N doped TiO2nano-particles-palygorskite composite materials were prepared by method of hydrolyze-depositing.UV-Vis spectrometer was applied to characterize the absorption spectra and the band gap of the composite materials.Combining with FTIR and XPS test,the form and mechanism of N-doping were analyzed.The results show that N is doped into the composite materials by the forms of TiN,NHxand NOx.The band gap of the composite materials decreases 0.58 eV.The threshold of absorbable light wavelength is approved by 105.35 nm.
N doped TiO2nano-particles-palygorskite composite materials were prepared by method of hydrolyze-depositing.UV-Vis spectrometer was applied to characterize the absorption spectra and the band gap of the composite materials.Combining with FTIR and XPS test,the form and mechanism of N-doping were analyzed.The results show that N is doped into the composite materials by the forms of TiN,NHxand NOx.The band gap of the composite materials decreases 0.58 eV.The threshold of absorbable light wavelength is approved by 105.35 nm.
引文
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[14]刘月.N掺杂纳米TiO2-凹凸棒石复合材料的制备及应用[D].北京:中国矿业大学(北京),2009.
[2]王利剑,郑水林,舒锋.硅藻土负载二氧化钛复合材料的制备与光催化性能[J].硅酸盐学报,2006,34(7):823-826.
[3]王利剑,郑水林,陈俊涛,等.纳米TiO2-硅藻土复合光催化材料的制备与表征[J].过程工程学报,2006,6(2):165-168.
[4]王利剑,郑水林,田文杰.载体对TiO2-硅藻土中TiO2相变及晶粒生长的影响[J].硅酸盐学报,2008,36(11):1644-1648.
[5]郑水林,王利剑,舒锋,等.可用于水和空气净化的硅藻土负载纳米TiO2材料的制备方法:中国,101195086[P].2008-06-11.
[6]郑水林,王利剑,熊余,等.以沉淀白炭黑为载体的负载型纳米TiO2复合材料的制备方法:中国,102039117A[P].2011-05-04.
[7]郑水林,文明,刘月,等.一种蛋白土负载纳米TiO2复合粉体材料的制备方法:中国,102198394A[P].2011-09-28.
[8]郑水林,王利剑,傅振彪,等.以硅藻土助滤剂为载体的负载型纳米TiO2光催化材料的制备方法:中国,102039118A[P].2011-05-04.
[9]SUDA Y,KAWASAKI H,UEDA T,et al.Preparation of nitrogen-doped titanium oxide thin film using a PLD method as parameters oftarget material and nitrogen concentration ratio in nitrogen-oxygengas mixture[J].Thin Solid Films,2005,475(2):337-341.
[10]ASAHI R,MORIKAWA T,OHWAKI T,et al.Visible-light photo-catalysis in nitrogen-doped titanium oxides[J].Science,2001,293(5528):269-271.
[11]KOBAYAKAWA K,MURAKAMI Y,SATO Y.Visible-light activeN-doped TiO2prepared by heating of titanium hydroxide and urea[J].Journal of Photochemistry and Photobiology:A:Chemistry,2005,170(2):177-179.
[12]YIN S,YAMAKI H,KOMATSU M,et al.Synthesis of visible-lightreactive TiO2-xNyphotocatalyst by mechanochemical doping[J].SolidState Sciences,2005,7(12):1479-1485.
[13]郑水林,刘月,熊余,等.氮掺杂凹凸棒石负载纳米TiO2可见光催化剂的制备方法:中国,101927177A[P].2010-12-29.
[14]刘月.N掺杂纳米TiO2-凹凸棒石复合材料的制备及应用[D].北京:中国矿业大学(北京),2009.