溶胶-凝胶法制备氮掺杂TiO_2薄膜降解亚甲基蓝废水
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摘要
以钛酸四丁酯为前驱物,无水乙醇为溶剂,乙酸丙酮和硝酸为水解抑制剂,以氨水为氮素来源制备氮掺杂二氧化钛溶剂,采用浸沉提拉法挂膜,并研究了氮掺杂二氧化钛对亚甲基蓝的降解作用。结果表明,镀膜层数为5层,焙烧温度为500℃,光催化时间为1 h的时候对亚甲基蓝废水的降解效果最好,最高可达到94.68%,经过X扫描射线检测,发现此温度下焙烧的二氧化钛可能是由板钛矿起主导作用,降解20 m L浓度为4 mg/L的亚甲基蓝脱色率可达94.68%。
Nitrogen-doped titanium dioxide was prepared with tetrabutyl titanate as precursor, anhydrous ethanol as solvent, acetic acid acetone and nitric acid as hydrolysis inhibitors, and ammonia as nitrogen source. The film of nitrogen-doped titanium dioxide was also prepared by dip-coating method. Its photocatalytic activity for degradation of methylene blue wastewater was studied. The results showed that, when the number of coating layers was five, the calcination temperature was 50 ℃, and the photocatalytic time was 1 h, the degradation effect of methylene blue wastewater was the best, and reached to 94.68%. X-ray scanning results showed that the titanium dioxide calcined at this temperature may be dominated by brookite, and the decolorization rate of 20 m L methylene blue with concentration of 4 mg/L reached to 94.68%.
Nitrogen-doped titanium dioxide was prepared with tetrabutyl titanate as precursor, anhydrous ethanol as solvent, acetic acid acetone and nitric acid as hydrolysis inhibitors, and ammonia as nitrogen source. The film of nitrogen-doped titanium dioxide was also prepared by dip-coating method. Its photocatalytic activity for degradation of methylene blue wastewater was studied. The results showed that, when the number of coating layers was five, the calcination temperature was 50 ℃, and the photocatalytic time was 1 h, the degradation effect of methylene blue wastewater was the best, and reached to 94.68%. X-ray scanning results showed that the titanium dioxide calcined at this temperature may be dominated by brookite, and the decolorization rate of 20 m L methylene blue with concentration of 4 mg/L reached to 94.68%.
引文
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[6]Asahi R,Morikawa T,Ohwaki T et al.The research progress of single component waterborne polyurethane coatings[J].Science,2001,293:269-271.
[7]Okada M,Yamada Y,Jin P et al.Fabrication of multifunctional coating which combines low-e property and visible-light-responsive photocatalytic activity[J].Thin Solid Films,2003,442:217-221.
[8]Diwald O,Thompson T L,Goralski E G et al.Photochemi-cal activity of nitrogen-doped rutile Ti O2(110)in visible light[J].Journal of Physical Chemistry B,2004,108:52-57.
[9]Burda C,Lou Y,Chen X et al.Enhanced nitrogen doping in Ti O2nanoparticles[J].Nano Letters,2003,3(8):1049-1051.
[10]Lindgren T,M wabora J.M,Avendano E.et al.Photoelectro-chemical and optical properties of nitrogen doped titanium dioxide films prepared by reactive DC magnetron sputtering[J].Journal of Physical Chemistry B,2003,107(24):5709-5716.
[11]Kazemeini M H,Berezin A A Fukuhara N.Ion implantation doping anatase Ti O2 thin film optical properties[J].Thin Solid Films,2000,372(1-2):70-77.
[12]Ngaruiyal J M,Mohamed S H,Kappertz O.et al.Structure formation upon reactive direct current magnetron sputtering of transition metal oxide films[J].Applied Physics Letters(a),2004,85(5):748-750.
[13]Zhao Q N,Li CL,He X et al.Non-metallic modified Ti O2 photocatalytic induced by visible light[J].Key Engineering Materials,2003,249:457-462.
[2]钟理,吕扬.废水中有机污染物高级氧化过程的降解[J].化工进展,1998,17(4):51-53,64.
[3]田守卫,王作辉,刘阳思,等.负载纳米Ti O2薄膜的光催化自清洁陶瓷的制备[J].钢铁钒钛,2006,27(3):26-30.
[4]Frank S N,Bard A J.Photo-assisted oxidations and photo electro synthesis at polycrystalline Ti O2 electrodes[J].Journal of America Chemistry Society.1977,99(14):4667-4675.
[5]Cho I W,Tcrmm A,Hoffmann M R,The Role of Metal Ion Dopants in Quantum-Sized Ti O2 Correlation between Photo Reactivity and Charge Carrier Recombination Dynamics[J].Journal of America Chemistry,1994,98(5);13669-13679.
[6]Asahi R,Morikawa T,Ohwaki T et al.The research progress of single component waterborne polyurethane coatings[J].Science,2001,293:269-271.
[7]Okada M,Yamada Y,Jin P et al.Fabrication of multifunctional coating which combines low-e property and visible-light-responsive photocatalytic activity[J].Thin Solid Films,2003,442:217-221.
[8]Diwald O,Thompson T L,Goralski E G et al.Photochemi-cal activity of nitrogen-doped rutile Ti O2(110)in visible light[J].Journal of Physical Chemistry B,2004,108:52-57.
[9]Burda C,Lou Y,Chen X et al.Enhanced nitrogen doping in Ti O2nanoparticles[J].Nano Letters,2003,3(8):1049-1051.
[10]Lindgren T,M wabora J.M,Avendano E.et al.Photoelectro-chemical and optical properties of nitrogen doped titanium dioxide films prepared by reactive DC magnetron sputtering[J].Journal of Physical Chemistry B,2003,107(24):5709-5716.
[11]Kazemeini M H,Berezin A A Fukuhara N.Ion implantation doping anatase Ti O2 thin film optical properties[J].Thin Solid Films,2000,372(1-2):70-77.
[12]Ngaruiyal J M,Mohamed S H,Kappertz O.et al.Structure formation upon reactive direct current magnetron sputtering of transition metal oxide films[J].Applied Physics Letters(a),2004,85(5):748-750.
[13]Zhao Q N,Li CL,He X et al.Non-metallic modified Ti O2 photocatalytic induced by visible light[J].Key Engineering Materials,2003,249:457-462.