本文選題：光催化劑 + 氧化鋅�。� 參考：《昆明理工大學》2017年碩士論文

【摘要】：數(shù)十年來,水污染及其造成的相關影響是人類社會需要面臨的重大難題。目前主要的水體污染源是工業(yè)廢水,如鋼鐵冶金企業(yè)產生的焦化廢水等。當前需要尋找一種運行費用低,去污能力強,不易產生二次污染并且能夠廣范圍使用的工業(yè)廢水處理技術。光催化技術作為一種高級氧化技術可以利用太陽光將有機污染物礦化為H_2O和CO_2,不會對環(huán)境造成二次危害。因此光催化技術是有良好應用前景的綠色水處理技術。在可用于光催化反應的半導體中,ZnO因具有優(yōu)良的光電性質和安全無毒等優(yōu)點使其在太陽能研究領域中備受關注。本論文研究內容包括:(1)采用水熱法制備出五種形貌ZnO材料。所得ZnO材料均屬纖鋅礦型,結晶較好;通過紫外光下光催化降解甲基橙實驗表明:五種形貌的ZnO材料的光降解反應均屬類一級反應,其降解效率分別為:η針狀=72.6%,η花瓣狀=77.5%,η片層狀=68.6%,η絨球狀=84.4%和η球狀=62.1%;催化材料比表面積越大,則降解效率更高;五種ZnO材料中除片層狀外,材料結晶度與降解效率成正相關;反應環(huán)境中光催化劑用量與降解效率呈先增后平的關系,反應環(huán)境中有機物初始濃度和助氧化劑濃度與降解效率呈倒U型關系,反應環(huán)境中溶液pH值與降解效率呈U型關系。純ZnO材料存在嚴重的光腐蝕其隨反應進行會逐漸消耗且不易回收,因此純ZnO光催化劑不適用于作光催化降解反復利用。(2)利用溶液混合法制備出不同質量摻雜比(Fe_3O_4@ZnO:GO)具有可見光響應的磁性復合光催化劑。在可見光下進行光降解甲基橙的實驗表明:當Fe_3O_4@ZnO和GO的質量比率為0.8:0.2時,光催化性能最佳,在150min內降解效率η=92%;光催化反應主要發(fā)生在Fe_3O_4@ZnO表面,GO并不直接參與光催化反應;該磁性復合材料可通過施加外部磁場達到光催化劑的有效分離,并且可實現(xiàn)有限次循環(huán)使用。因此,這種增強了光電化學性能的磁性復合光催化劑可以成為去除廢水中有機物的候選材料。
[Abstract]:For decades, water pollution and its related impacts have been a major problem for human society. At present, the main source of water pollution is industrial wastewater, such as coking wastewater produced by iron and steel metallurgical enterprises. At present, it is necessary to find a kind of industrial wastewater treatment technology with low operating cost, strong decontamination ability, not easy to produce secondary pollution and can be widely used. As an advanced oxidation technology, photocatalytic technology can mineralize organic pollutants into H _ 2O and CO _ 2 by solar light, which will not cause secondary harm to the environment. Therefore, photocatalytic technology is a promising green water treatment technology. ZnO has attracted much attention in the field of solar energy research because of its excellent photoelectric properties and safety and non-toxicity in photocatalytic semiconductor. The main contents of this thesis are as follows: (1) five ZnO materials with different morphologies were prepared by hydrothermal method. The results of photocatalytic degradation of methyl orange under ultraviolet light showed that the photodegradation reaction of all the ZnO materials with five morphologies was of a class 1 order reaction, and all of the ZnO materials were of wurtzite type and had good crystallinity, and the photocatalytic degradation of methyl orange was characterized by photocatalytic degradation of methyl orange. The degradation efficiencies were: 畏 acicular 72.6, 畏 petal 77.5, 畏 lamellar 68.6, 畏 villous 84.4% and 畏 spherical 62.1; the larger the specific surface area of the catalytic materials, the higher the degradation efficiency, the higher the crystallinity of the five ZnO materials except the lamellar layer, the higher the crystallinity and the degradation efficiency, the higher the degradation efficiency was, the higher the specific surface area of the catalytic materials was, the higher the degradation efficiency was, and the higher the degradation efficiency was, the higher the specific surface area of the catalytic materials was, the higher the degradation efficiency was. In the reaction environment, the amount of photocatalyst increased first and then the degradation efficiency, the initial concentration of organic matter and the concentration of co-oxidant in the reaction environment were inversely U-shaped, and the pH value of the solution in the reaction environment was U-shaped with the degradation efficiency. The pure ZnO material has serious photocorrosion which will be consumed gradually with the reaction and is not easy to be recovered. Therefore, pure ZnO photocatalyst is not suitable for repeated use of photocatalytic degradation. (2) the magnetic composite photocatalyst with different mass doping ratio (Fe3O4 / ZnO: go) has visible light response. The experiment of photodegradation of methyl orange under visible light shows that when the mass ratio of Fe3O4ZnO and go is 0.8: 0.2, the photocatalytic performance is the best, and the degradation efficiency 畏 ~ (92x) in 150min is the best, and the photocatalytic reaction mainly occurs in Fe3O4 / ZnO surface and go does not directly participate in the photocatalytic reaction. The magnetic composite can be separated effectively by external magnetic field and can be reused for a limited time. Therefore, the magnetic composite photocatalyst, which enhances the photochemical properties, can be used as a candidate material for the removal of organic compounds in wastewater.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O643.36;X703

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