纳米TiO_2薄膜的制备及其光催化性能的研究
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摘要
采用传统的溶胶-凝胶法以及改良的溶胶-凝胶法制得了纳米二氧化钛溶胶。对实验原理,实验工艺,原料的选配及实验参量等因素进行了阐述,其重点是实验参量的研究。以钛酸四丁酯为钛源,双氧水为络合剂的溶胶-凝胶-沉淀解胶法制备纳米二氧化钛溶胶,其中水与钛酸四丁酯的摩尔比为1:7;双氧水与钛酸四丁酯的摩尔比为1:17;反应温度控制在20℃左右即可;传统的溶胶凝胶法,钛酸四丁酯为钛源,无水乙醇为溶剂,冰醋酸或三乙醇胺为络合剂,其较佳的实验条件是采用滴加的方式加入水,且将水与乙醇和pH调节剂配成混合溶液;水与钛酸四丁酯的摩尔比值取6~7;乙醇与钛酸四丁酯的摩尔比值取27~28;pH控制在3~4或8~9;水解的温度控制在20~30℃;四氯化钛、无水乙醇、聚乙二醇600为反应物的非水解溶胶-凝胶法制备纳米二氧化钛溶胶,其较佳的实验条件是无水乙醇与四氯化钛的摩尔比为7:1;PEG与四氯化钛的摩尔比为0.1:1;反应温度控制在0℃左右。
     采用旋转提拉法以载玻片为基底制备了纳米二氧化钛薄膜,根据实验得到了在最佳溶胶实验的条件下的最佳镀膜次数、煅烧温度、煅烧时间,并对其进行了XRD的测定。本论文的另一个实验目的是为了给二氧化钛光催化降解污水中的有机污染物提供参考。以亚甲基蓝、罗丹明B、双酚A、对氯酚模拟工业废水。在实验中考察了众多实验因素对光催化降解的影响。在实验中发现二氧化钛薄膜催化剂的加入量、降解液的初始浓度、降解液的pH、光照时间、光照强度、降解温度等因素对纳米二氧化钛薄膜光催化降解能力的影响。并对最佳降解条件下的降解后的溶液进行了化学耗氧量(COD)的测定,其得到的结果较为理想。
This paper use the traditional sol-gel method, and an improved sol-gel legal system of the nano- TiO2 sol. The principle of experiment, the experimental process, and the selection of raw material factors such as experimental parameters is discussed, the emphasis is on the experimental parameters of research. With tetra butyl titanate ester of titanium source, hydrogen peroxide solution for complexing agent by sol-gel precipitation solution glue al.chemical strategies for nano- TiO2 sol, including water and tetra butyl titanate ester of mole ratio for bid, Hydrogen peroxide and tetra butyl titanate ester of mole ratio for generations, The reaction temperature control in 20℃around can. In the reaction process should pay attention to safety, because this reaction for exothermic reaction, Using the traditional sol-gel method, tetra butyl titanate ester of titanium source, anhydrous ethanol solvent glacial acetic acid or applying triethanolamine as complexing agent and became nano-TiO2 sol, one better condition of experiment is to adopt the drops of water, add way to join and water with ethanol and pH regulator with mixed solution, Water and tetra butyl titanate ester the molar ratio of take six to seven, Ethanol and tetra butyl titanate ester the molar ratio of take 27~28; PH control in 3~4 or 8~9, Hydrolysis of temperature control in 20℃-30℃;Four chlorinated titanium, anhydrous alcohol, polyethylene glycol (600), inhydrolysis sol-gel process), its nano- TiO2 sol better experiment condition is anhydrous alcohol and four chlorinated titanium mole ratio for now, Mpeg and four chlorinated titanium the molar ratio of 0.1:1; The reaction temperature control in 0℃around.
     This paper adopts rotating tiras method with glass slides for preparation of nanometer TiO2 thin film substrate, according to the experimental got in the best of conditions of colloidal experiments best coating times, calcining temperature, calcining time, and analyses the XRD is determined.This thesis another experiment aim is to give the titanium dioxide photocatalytic degradation of organic pollutants sewage to provide the reference. By methylene blue, Rhodamine B, bisphenol A,4-chlorophenol simulated industrial wastewater. In experiments investigated numerous experimental factors influence of optical catalytic degradation. In trials found TiO2 thin film catalyst addition amount, degradation of liquid initial concentration, degradation of liquid pH and the time of light, light intensity, degradation factors such as temperature of nanometer TiO2 thin film photocatalytic degradation ability influence. And the best degradation under the condition of the solution after degradation the chemical oxygen consumption (COD) was measured.
引文
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