本研究利用光沉積法、含浸法、溶膠凝膠法，製備不同鎳含量之二氧化鈦光觸媒，並改變不同製備的條件，期望以簡易經濟的方式製備出高活性的光觸媒材料。藉由調整實驗製程之參數來改變光觸媒材料的反應活性，藉此找出最適的鎳摻雜量。
實驗中主要以光沉積法製備方法為研究重點，針對樣品的物理性質及光催化活性做分析，以找出材料表面特徵與活性的關連性。物理性質以X光繞射（XRD）、電子顯微鏡（TEM、SEM）、反射式紫外可見光譜儀（UV-Vis-DRS）、光激發螢光（PL）、X射線光電子能譜儀（XPS）等儀器，對改質過後的樣品作分析，以觀察改質前後差異。光催化活性則分為氣相與液相反應兩類系統，比較各觸媒之光催化活性。液相反應是以光催化觸媒降解甲基橙水溶液，觀察照射紫外光後觸媒對甲基橙之脫色能力。氣相以光催化降解無機性氮氧化物及有機性乙醛等汙染氣體作為研究的重點。結果顯示以UVC作為沈積光源製備之鎳含量為0.1%時，可以使改質之光觸媒在氮氧化物氧化反應中具有最佳的活性，並可以有效地抑制中間產物的生成。分析其原因為表面具鎳化合物時，其紫外光激發的電子電洞數目會增加，且其亦具有吸引電子電洞分離效果，並且對於氧化中間產物NO2氣體具有優良之親和性，因此，在本研究中可以藉由改質過程而將NOx去除率提高2倍。

In this work, titania photocatalysts doped with different amount of nickel for the better activity was prepared by photodeposition impregnation, and sol-gel methods. The work focused on the Ni-modification on TiO2 via photodeposition majorly due to the ease of process and good activity of the catalyst. The physical properties and photocatalytic activities of prepared samples were investigated in detail. The results were explained satisfactorily by the interaction between the surface characteristic and photocatalytic activity. In the first part, the physical characterization of prepared catalysts were investigated by x-ray diffractometry (XRD), UV-Vis-diffuse reflectance spectra (UV-Vis), X-ray photoelectron spectra (XPS), turbidimeter, photoluminescence (PL), transmission electron microscopy (TEM). The XPS measurement showed the amount of Ni on TiO2 surface was increased with the concentration of nickel salt in the solution for photodepostion reaction. The turbidity was increased with the increase of amount of Ni on titania. In PL experiment, the photo-excited intensity of 0.1% Ni-doped TiO2 was largest, which was consistent with the photoactalytic activity in the degradation of NO. In the second part, the photocatalytic activity was investigated by the degradation of gaseous NOx and acetaldehyde over the modified titania under UV light irradiation. It depicts that the TiO2 doped with 0.1% Ni prepared by photodeposition under UVC illumination exhibits the highest photocatalytic activity in degradation of gaseous NOx and it can retard the formation of the undesired intermediate, NO2, effectively. The results can attribute to the number of photo-excited electron-hole pairs of titania is increased with deposition of the proper amount of Ni on TiO2 surface. Moreover, the recombination of excited electron and hole is retarded in the presence of Ni due to it traps the electron. Therefore, the photocatalytic degradation rate of NO over TiO2 is improved twice by the Ni-modified process. Futhuremore, the photocatalytic activity of prepared samples were also tested in the degradation of aqueous methyl orange under UV light irradiation. The low activity of Ni-modified TiO2 in the decolorization reaction is because the doped Ni may cause aggregation as shown in the turbidity measurements. The simple process with low cost for preparation of active photocatalyst, 0.1% Ni-doped TiO2, was developed in this work. It exhibits a good potential for the application of air purification.

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