本文選題：光電化學(xué)　切入點(diǎn)：二氧化鈦納米管陣列　出處：《華南理工大學(xué)》2015年碩士論文

【摘要】：光催化是治理環(huán)境污染的一種新的有效技術(shù),而催化劑是光催化技術(shù)的核心,納米Ti O2對(duì)一般環(huán)境污染(有機(jī)污染物為主)的光催化降解效果顯著。當(dāng)前研究的重點(diǎn)為提高Ti O2對(duì)太陽光的利用率和光催化活性,非金屬摻雜可以提高其對(duì)可見光的利用率,光電化學(xué)方法則能有效提高Ti O2光催化活性。本研究結(jié)合陽極氧化和化學(xué)沉積的方法合成碳氮共摻雜的二氧化鈦納米管陣列(C-N-TNTAs),并采用XRD、FESEM、UV-vis、XPS等技術(shù)對(duì)材料進(jìn)行表征。光電化學(xué)體系中,碳氮共摻雜二氧化鈦納米管陣列作為陽極,環(huán)境有機(jī)污染物(甲基橙和全氟辛酸溶液)作為光電催化氧化的對(duì)象,對(duì)光催化劑的氧化性能進(jìn)行考察,以此同時(shí),在陰極實(shí)現(xiàn)光解水產(chǎn)氫,在PEC體系中實(shí)現(xiàn)同時(shí)降解有機(jī)污染物和產(chǎn)氫。XRD的結(jié)果表明C-N-TNTAs主要形態(tài)為銳鈦礦型,并沒有出現(xiàn)金紅石相,結(jié)晶度良好;FESEM的結(jié)果說明說明了摻雜之后并未改變其陣列結(jié)構(gòu),有利于在環(huán)境上的運(yùn)用;UV-vis的結(jié)果表明,經(jīng)過碳氮摻雜之后,拓寬了其光響應(yīng)范圍;XPS檢測(cè)了其元素組成為C,N,O,Ti,這些表征結(jié)果說明明,碳氮成功地?fù)饺氲搅硕趸伡{米管陣列中,并未破壞其多孔有序的結(jié)構(gòu),而且比二氧化鈦納米管陣列具有更寬的光響應(yīng)范圍。光電催化降解有機(jī)污染物的實(shí)驗(yàn)中,運(yùn)用PEC的方法在30分鐘內(nèi)可以使5 mg/L的甲基橙降解完全;全氟辛酸的降解結(jié)果表明,由于光電協(xié)同的作用,導(dǎo)致PEC具有最高的氧化效率,其降解效率隨外加電壓的增大而升高,同時(shí)也具有較高的產(chǎn)氫速率(2.66 mmol/h)。電化學(xué)的研究結(jié)果表明:在PEC體系中,在外加電場(chǎng)的作用下,電子-空穴對(duì)復(fù)合的幾率將會(huì)減少,增加其光電催化活性,且外加電壓越大,其所產(chǎn)生的光電流密度越大,光電催化效果越好。本研究在PEC體系中實(shí)現(xiàn)了氧化物的降解和還原水產(chǎn)氫,此實(shí)驗(yàn)體系可能在光電催化降解污水中的有機(jī)污染物同時(shí)產(chǎn)氫方面具備良好的應(yīng)用前景。
[Abstract]:Photocatalysis is a new and effective technology to control environmental pollution, and catalyst is the core of photocatalytic technology. The photocatalytic degradation effect of nano-TiO _ 2 on general environmental pollution (organic pollutants mainly) is remarkable. At present, the emphasis of the research is to improve the utilization ratio and photocatalytic activity of TIO _ 2 to solar light, and non-metallic doping can improve the utilization ratio of visible light. Photochemical method can effectively improve photocatalytic activity of TIO _ 2. In this study, carbon and nitrogen co-doped titanium dioxide nanotube arrays (C-N-TNTAsN) were synthesized by anodic oxidation and chemical deposition, and the materials were characterized by X-ray diffraction (XRD) FESEMU UV-vis-XPS. In photochemical systems, Carbon and nitrogen co-doped titanium dioxide nanotube arrays were used as anode and environmental organic pollutants (methyl orange and perfluorooctanoic acid solution) as photocatalytic oxidation objects. The results of photodissociation of aquatic hydrogen in cathode, simultaneous degradation of organic pollutants and hydrogen production in PEC system showed that the main morphology of C-N-TNTAs was anatase, and no rutile phase appeared. The results of FESEM with good crystallinity indicate that the array structure has not been changed after doping, and the results of UV-vis are beneficial to the application of UV-vis in the environment. The results show that carbon and nitrogen have been successfully doped into the TiO2 nanotube array without destroying the porous and ordered structure of the TiO2 nanotube array, and the elemental composition of the TiO2 nanotube array has been determined by XPS, and the results show that the carbon and nitrogen has been successfully doped into the TiO2 nanotube array without destroying the porous and ordered structure of the TiO2 nanotube array. In the experiment of photocatalytic degradation of organic pollutants, PEC can completely degrade 5 mg/L methyl orange within 30 minutes, and the degradation results of perfluorooctanoic acid show that the photocatalytic degradation of organic pollutants is more effective than that of TiO2 nanotube arrays. Because of the photoelectricity synergism, PEC has the highest oxidation efficiency, its degradation efficiency increases with the increase of applied voltage, and it also has a high hydrogen production rate of 2.66 mmol / h.Electrochemical results show that in PEC system, Under the action of an external electric field, the probability of electron-hole recombination will be reduced, and the photocatalytic activity of the electron-hole pair will be increased, and the higher the applied voltage, the greater the photocurrent density will be. The better the photocatalytic effect is, the better the degradation of oxide and the reduction of aquatic hydrogen in PEC system. This experimental system may have a good prospect in photocatalytic degradation of organic pollutants in wastewater hydrogen production at the same time.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ134.11;X703

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相關(guān)期刊論文 前10條

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本文編號(hào)：1670768