【摘要】：在處理污染方面,光催化作為近些年新興的污染處理技術因其對污染物降解徹底,不產(chǎn)生二次污染、工藝設備簡單等優(yōu)點得到廣泛關注和研究,而在眾多光催化劑中,鎢/鉬酸鹽因具有獨特的結(jié)構和理化性質(zhì)、光學性能等受到普遍重視。本文對鉬酸鎘和鎢酸鋅進行了改性研究,首先利用水熱法制備樣品,然后通過X-射線衍射(XRD)、掃描電子顯微鏡(SEM)、紫外可見漫反射光譜(U V-vis DRS)、光電子能譜(XPS)、拉曼光譜(Raman)等表征手段來對所制備的樣品材料進行表征分析,最后對其光催化性能和光催化機理進行了分析,具體研究內(nèi)容如下:1.通過水熱法合成了鉬酸鎘與石墨烯復合光催化劑,并研究了鉬酸鎘與石墨烯復合光催化劑的光催化性能及光催化機理。實驗表明,石墨烯的加入使得樣品的吸附性能和光催化性能得到了較大提升,且最佳復合量為2.5%,它的光催化活性是純鉬酸鎘的5倍。2.研究了鎢酸鋅與鎢酸鉍復合光催化劑的光催化性能及光催化機理。鎢酸鋅與鎢酸鉍的復合光催化劑通過水熱法合成,復合提高了樣品光生電子和空穴的分離率,實驗得到當Zn與W的摩爾比為1.5:100時光催化效果最好,自由基捕獲實驗表明空穴在光催化過程中起了重要作用。3.研究了不同pH對鎢酸鋅結(jié)構、物化特性及光催化活性的影響,結(jié)果表明,當pH=8時鎢酸鋅樣品晶型最好,光催化效率也最高,在此條件下用金屬鉍(Bi)和金屬鋇(Ba)對鎢酸鋅進行摻雜改性,得到了摻雜量為3at%Bi和1.5at%Ba樣品的光催化效果最好,并研究了其光催化機理。
[Abstract]:As a new pollution treatment technology in recent years, the photocatalysis, as a new pollution treatment technology in recent years, is widely concerned and researched by the advantages of complete degradation of pollutants, no secondary pollution, simple process equipment and the like, and in a plurality of photocatalysts, As a result of its unique structure and physical and chemical properties, the optical properties and so on are of great importance. In this paper, the modification of zinc gluconate and zinc tungstate was studied. The samples were prepared by hydrothermal method, and then by X-ray diffraction (XRD), scanning electron microscope (SEM), UV-visible diffuse reflection spectrum (U V-vis DRS), and photoelectron spectroscopy (XPS). The characterization and analysis of the prepared sample materials were carried out by Raman and other characterization methods, and the photocatalytic performance and the light catalytic mechanism were analyzed. The specific content of the study was as follows: 1. In this paper, the photo-catalytic properties and the photocatalytic mechanism of the graphite-acid-and graphene composite photocatalysts were studied by hydrothermal method. The experiment shows that the addition of the graphene makes the adsorption property and the photocatalytic property of the sample to be greatly improved, and the optimum composite amount is 2.5%, and the photocatalytic activity of the graphene is 5 times of that of the pure graphene. The photocatalytic performance and the photocatalytic mechanism of the composite photocatalyst of zinc tungstate and tungstic acid were studied. The composite photocatalyst of zinc tungstate and tungstate acid is synthesized by hydrothermal method, and the separation rate of electron and hole of sample light is improved. The experiment results show that the molar ratio of Zn to W is 1. 5: 100. The catalytic effect is the best. The free radical trapping experiment shows that the hole plays an important role in the process of photocatalysis. The effects of different pH on the structure, physical and chemical properties of zinc tungstate and the photocatalytic activity of zinc tungstate were studied. The results showed that when pH = 8, the crystal type of zinc tungstate was the best, and the photocatalytic efficiency was the highest. The photocatalytic effect of the sample with the doping amount of 3at% Bi and 1. 5at% Ba was the best, and the light catalytic mechanism was studied.
【學位授予單位】：南京信息工程大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O643.36;O644.1

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本文編號：2383663