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掺铁二氧化钛光催化剂制备及其光催化性质的研究
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摘要
在诸多半导体光催化材料中,由于TiO2具有化学稳定性好、光催化效率高,成本低、无毒等优点。已成为国内外环境科学工作者的研究热点。由于普通粉末状TiO2在使用过程中存在光活性不高、分离与回收困难以及易产生二次污染等问题,因此TiO_2改性、薄膜固载化逐渐成为新的研究热点。
     本文对玻璃负载改性TiO_2膜的制备方法进行了研究。以钛酸四丁酯为前躯物,采用溶胶-凝胶法制备纳米TiO_2光催化材料。对含偶氮染料工业废水进行光催化降解,寻求光催化降解偶氮染料的工艺及条件。研究利用分光光度计、XRD、Raman、TG-DSC及HRTEM等测试手段对实验结果进行表征分析。
     实验结果表明:Fe-TiO_2光催化材料的最优制备条件为驱体配比(摩尔比)为n=Ti(OC4H9)4:C2H5OH:HNO3:H2O=0.05:15:0.35:2;掺铁量W (Fe~(3+)/ TiO_2)=2.5%;煅烧温度为400℃;煅烧时间为2h;溶胶反应温度为40℃。
     在此基础上,选择273nm波长的紫外灯和模拟阳光为光源对偶氮染料催化进行催化降解实验,实验结果表明:
     紫外光下,TiO_2复合光催化剂对偶氮染料催化降解,偶氮废水初始吸光度A=0.104,废水初始pH值为4,最佳条件下Fe-TiO_2处理偶氮废水的脱色率达到94.7%,COD去除率达到85.2%。
     自然光下,TiO_2光催化材料在酸性条件下对偶氮染料也有较理想的降解脱色效果,降解2h脱色率达53%。
     研究表明,通过掺杂铁离子对二氧化钛进行的改性使反应的响应光谱向可见光拓展,并有效抑制电子—空穴对的复合,很大程度提高了光催化反应效率。
     本文还研究了TiO_2光催化材料的重复利用。研究表明:该催化材料可重复使用,重复使用5次后脱色率仍达66.9%。
Photocatalytic materials in recent years,titanium dioxide has been widely used because of many advantages,such as better chemical stability,higher photocatalytic efficiency,cheapness and intoxicity. However powdered TiO_2 has some shortages such as low catalytic activity, difficulty in separation and recovery. Key problem in this research is modification of TiO_2 and immobilization technology.
     In this paper,the methods of preparing Fe-TiO_2 thin film coated on glass-slide were investigated. It is suggested that sol-gel method using Ti(OC4H9)4 is the best method for preparation of TiO_2. Wastewater of azo dye was photodegraded by the photocatalyst TiO_2 and the optimal technique condition was obtained. Experimental results were characterized and analyzed by some modern measurements,such as UV-Vis,XRD,Raman,TG-DSC,HRTEM et al.
     The optimal reaction condition was gotten after experiments and analysis: n=Ti(OC4H9)4:C2H5OH:HNO3:H2O=0.05:15:0.35:2 (mol ratio),hydrolysis at 40℃, W (Fe3+/ TiO_2)=2.5%(mol ratio) ,calcinations at 400℃for 2 hours.
     On this basis,using ultraviolet germicidal lamp with wavelength of 273nm or vis-light as light-source,the contaminants removal effect in azo-dye wastewater.
     Under UV irradiation, photocatalytic results of azo dye by TiO_2 compound photocatalyst showed that when initial concentration of azo-dye was A=0.104,solution pH was 4, decolorization rate after 2h could get to 94.7%. COD removal rate Could get to 85.2%.
     Nevertheless,under solar irradiation,removal rate of azo-dye by TiO_2 compound photocatalyst could get to 53%.
     The experiment results showed that photocatalytic activity was improved by sol-gel method by doping of Fe3+ and the photocatalytic efficiency were also raised obviously in sunlight. The addition of appropriate amount of Fe3+ is effective for improving the photo-catalytic activities of TiO_2 by inhibiting the formation of recombination centers of photo-generated electron-hole pairs on the surface of TiO_2 particles.
     The reuse of photocatalytic material was also researched in this thesis. The experiment results showed that the material can be reused many times. The photocatalyst could be recycled several times and removal rate could get to 66.9% after reused 5 times.
引文
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