TiO_2/Al_2O_3复合薄膜光催化特性的研究
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摘要
TiO_2是一种廉价、高活性、安全无污染且性能稳定的半导体材料,广泛的应用于电介质材料、光催化薄膜、减反射涂层、氧传感器、湿度传感器以及电色窗等。半导体TiO_2由于具有优良的光催化活性,有着广泛的应用前景。
本文研究TiO_2/Al_2O_3复合薄膜的制备及其光催化作用。在铝阳极氧化膜的基底上,采用交流电沉积的方法成功的合成出TiO_2/Al_2O_3复合薄膜,并对它们的物性进行研究。运用扫描电子显微镜、X射线衍射等测试手段对复合薄膜的形貌、结构和组成进行表征;测定TiO_2/Al_2O_3薄膜的紫外-可见反射吸收光谱;研究锐钛矿型TiO_2对降解低浓度的甲基橙溶液的光催化作用;探讨TiO_2/Al_2O_3复合薄膜的制备条件对膜光催化活性的影响;在TiO_2/Al_2O_3复合薄膜中,沉积重金属银,合成出TiO_2,Ag/Al_2O_3复合膜,改善其光催化特性,并进行理论分析;测定TiO_2/Al_2O_3和TiO_2,Ag/Al_2O_3复合薄膜光催化降解甲基橙溶液的交流阻抗谱。得出以下主要结论:
1)在铝阳极氧化膜微孔中沉积TiO_2,确定最佳沉积工艺;
2) Al_2O_3的扩孔时间和氧化时间、TiO_2沉积时间、热处理温度这些因素对TiO_2/Al_2O_3复合薄膜光催化活性有一定影响;
3)在TiO_2/Al_2O_3复合薄膜中沉积一定量的银,制备TiO_2,Ag/Al_2O_3复合薄膜,有效提高其光催化活性。Ag+沉积大大提高了TiO_2/Al_2O_3复合薄膜对紫外-可见光的吸收,将光响应范围扩展到可见光,把光源利用范围扩大至可见光;
4)不同光源照射下,TiO_2/Al_2O_3复合薄膜的光催化活性不同:紫外杀菌灯照射下光催化活性最强,白炽灯照射下活性最弱。Ag+沉积对TiO_2/Al_2O_3复合薄膜的光催化活性增强作用也不同:白炽灯增强最多,紫外杀菌灯增强最少;
5)从TiO_2/Al_2O_3复合薄膜的表面形貌、紫外-可见反射吸收光谱(DRS)、交流阻抗谱三方面对其光催化作用进行分析。
TiO_2 is a cheap, high activities, safe and non-pollution semiconductor material. It is widely used in insulation, photocatalytic materials, reflection reducer, oxide sensors, humidity sensors and electro-colored windows. It has an extent applied expect because of its photocatalitic properties.
This dissertation studied on the preparation of TiO_2/Al_2O_3 composite films and their photocatalytic properties. The technique of the electrochemical anodization was employed to synthesize anodic aluminum oxide films. TiO_2 film was successfully fabricated by alternating electrodeposition in the titanic solution, and its physical properties were studied. Various measurements including SEM, XRD and DRS were used to characterize the morphology, structure, composition. Photocatalysis of TiO_2/Al_2O_3 composite films in the anatase form was studied for the photocatalytic degradation of methyl orange solution .We have researched the influence of the preparation condition of TiO_2/Al_2O_3 on the photocatalisis properties of films. In the TiO_2/Al_2O_3 composite film, we deposited silver to compose TiO_2,Ag/Al_2O_3 composite film and improve its photocatalisis properties, and analyzed it in the abstract. AC impedance spectra of TiO_2/Al_2O_3 and TiO_2,Ag/Al_2O_3 was tested. The main results and conclusion can be summarized as follows:
1) TiO_2 was deposited in the alumina holes. And an optimal process was found to deposit this film;
2) The oxidation time and hole-extension time of the alumina、TiO_2 deposit time and heat treatment had a certain effect on the photocatalitic properties of the TiO_2/Al_2O_3 composite films;
3) The certain silver ion deposited in the TiO_2/Al_2O_3 composite films to prepare TiO_2,Ag/Al_2O_3 films and improve the photocatalitic properties;
4) Under the different lamp irradiation, the photocatalitic properties of composite films TiO_2/Al_2O_3 were compared: ultraviolet sterilized lamp was the strongest, incandescence lamp was the weakest. And the photocatalitic properties of composite films TiO_2,Ag/Al_2O_3 were compared: Under incandescence lamp, improved the most, under ultraviolet sterilized lamp, improved the least;
5) Results were discussed on the morphology, DRS and AC impedance diagram of the TiO_2 films.
本文研究TiO_2/Al_2O_3复合薄膜的制备及其光催化作用。在铝阳极氧化膜的基底上,采用交流电沉积的方法成功的合成出TiO_2/Al_2O_3复合薄膜,并对它们的物性进行研究。运用扫描电子显微镜、X射线衍射等测试手段对复合薄膜的形貌、结构和组成进行表征;测定TiO_2/Al_2O_3薄膜的紫外-可见反射吸收光谱;研究锐钛矿型TiO_2对降解低浓度的甲基橙溶液的光催化作用;探讨TiO_2/Al_2O_3复合薄膜的制备条件对膜光催化活性的影响;在TiO_2/Al_2O_3复合薄膜中,沉积重金属银,合成出TiO_2,Ag/Al_2O_3复合膜,改善其光催化特性,并进行理论分析;测定TiO_2/Al_2O_3和TiO_2,Ag/Al_2O_3复合薄膜光催化降解甲基橙溶液的交流阻抗谱。得出以下主要结论:
1)在铝阳极氧化膜微孔中沉积TiO_2,确定最佳沉积工艺;
2) Al_2O_3的扩孔时间和氧化时间、TiO_2沉积时间、热处理温度这些因素对TiO_2/Al_2O_3复合薄膜光催化活性有一定影响;
3)在TiO_2/Al_2O_3复合薄膜中沉积一定量的银,制备TiO_2,Ag/Al_2O_3复合薄膜,有效提高其光催化活性。Ag+沉积大大提高了TiO_2/Al_2O_3复合薄膜对紫外-可见光的吸收,将光响应范围扩展到可见光,把光源利用范围扩大至可见光;
4)不同光源照射下,TiO_2/Al_2O_3复合薄膜的光催化活性不同:紫外杀菌灯照射下光催化活性最强,白炽灯照射下活性最弱。Ag+沉积对TiO_2/Al_2O_3复合薄膜的光催化活性增强作用也不同:白炽灯增强最多,紫外杀菌灯增强最少;
5)从TiO_2/Al_2O_3复合薄膜的表面形貌、紫外-可见反射吸收光谱(DRS)、交流阻抗谱三方面对其光催化作用进行分析。
TiO_2 is a cheap, high activities, safe and non-pollution semiconductor material. It is widely used in insulation, photocatalytic materials, reflection reducer, oxide sensors, humidity sensors and electro-colored windows. It has an extent applied expect because of its photocatalitic properties.
This dissertation studied on the preparation of TiO_2/Al_2O_3 composite films and their photocatalytic properties. The technique of the electrochemical anodization was employed to synthesize anodic aluminum oxide films. TiO_2 film was successfully fabricated by alternating electrodeposition in the titanic solution, and its physical properties were studied. Various measurements including SEM, XRD and DRS were used to characterize the morphology, structure, composition. Photocatalysis of TiO_2/Al_2O_3 composite films in the anatase form was studied for the photocatalytic degradation of methyl orange solution .We have researched the influence of the preparation condition of TiO_2/Al_2O_3 on the photocatalisis properties of films. In the TiO_2/Al_2O_3 composite film, we deposited silver to compose TiO_2,Ag/Al_2O_3 composite film and improve its photocatalisis properties, and analyzed it in the abstract. AC impedance spectra of TiO_2/Al_2O_3 and TiO_2,Ag/Al_2O_3 was tested. The main results and conclusion can be summarized as follows:
1) TiO_2 was deposited in the alumina holes. And an optimal process was found to deposit this film;
2) The oxidation time and hole-extension time of the alumina、TiO_2 deposit time and heat treatment had a certain effect on the photocatalitic properties of the TiO_2/Al_2O_3 composite films;
3) The certain silver ion deposited in the TiO_2/Al_2O_3 composite films to prepare TiO_2,Ag/Al_2O_3 films and improve the photocatalitic properties;
4) Under the different lamp irradiation, the photocatalitic properties of composite films TiO_2/Al_2O_3 were compared: ultraviolet sterilized lamp was the strongest, incandescence lamp was the weakest. And the photocatalitic properties of composite films TiO_2,Ag/Al_2O_3 were compared: Under incandescence lamp, improved the most, under ultraviolet sterilized lamp, improved the least;
5) Results were discussed on the morphology, DRS and AC impedance diagram of the TiO_2 films.
引文
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