【摘要】：由于工農(nóng)業(yè)生產(chǎn)的日趨發(fā)展導致含氮化合物的排放量過度增加。含氮化合物已成為環(huán)境的主要污染物,并受到了社會各界的廣泛關(guān)注。開發(fā)經(jīng)濟、高效的除氮技術(shù)已成為水污染治理的重點和熱點。其中,重金屬又存在易與含氮絡(luò)合物相結(jié)合的特點,常規(guī)的水處理方法對這一復雜水質(zhì)難以有效去除,因此需要尋找一種既能有效去除氨氮又能回收重金屬的方法。利用陽極氧化法制備的穩(wěn)定性能良好的二氧化鈦納米管電極作為光陽極,鈦片作為陰極對水體中氨氮的不同形式(無機氨氮形式、有機氨氮形式、含氮重金屬絡(luò)合物形式)進行光電催化降解和回收重金屬的實驗。對光電降解水體中的氨氮考察了外加偏壓、初始p H值、初始氨氮的濃度、電解質(zhì)的濃度以及類型、絡(luò)合物配比等條件實驗。對光電協(xié)同效應(yīng)的主要機理進行了探討。對無機氨氮形式、有機氨氮形式的光電降解過程中的產(chǎn)物進行了分析,結(jié)果表明光電協(xié)同法去除水體中氨氮的主要產(chǎn)物為氮氣,因此可以認為光電法催化氨氮可為實現(xiàn)工業(yè)化提供一定的理論依據(jù)。最后分析了光電催化降解含氮重金屬絡(luò)合物的降解路徑,結(jié)果表明主要通過羥基自由基實現(xiàn)其破絡(luò)合。借助XPS表征手段分析了陰極的還原過程。
[Abstract]:Due to the development of industrial and agricultural production, the emissions of nitrogen compounds increase excessively. Nitrogen compounds have become the main environmental pollutants, and have been widely concerned by all walks of life. Development of economic and efficient nitrogen removal technology has become the focus and focus of water pollution control. Among them, heavy metals are easy to be combined with nitrogen-containing complex compounds. It is difficult to remove the complex water by conventional water treatment methods. Therefore, it is necessary to find a method that can effectively remove ammonia nitrogen and recover heavy metals. Titanium dioxide nanotube electrode with good stability prepared by anodic oxidation method was used as photoanode and titanium sheet as cathode for different forms of ammonia nitrogen in water (inorganic ammonia nitrogen, organic ammonia nitrogen). The photocatalytic degradation and recovery of heavy metals were carried out in the form of nitrogen-containing heavy metal complexes. The conditions of photodegradation of ammonia nitrogen in water were investigated, such as applied bias voltage, initial pH value, initial concentration of ammonia nitrogen, concentration and type of electrolyte, and ratio of complex. The main mechanism of photoelectric synergistic effect is discussed. The products in the photodegradation process of inorganic ammonia nitrogen and organic ammonia nitrogen were analyzed. The results showed that the main product of removing ammonia nitrogen in water by photoelectric synergistic method was nitrogen. Therefore, it can be concluded that photocatalysis of ammonia nitrogen can provide a theoretical basis for industrialization. Finally, the degradation path of photocatalytic degradation of nitrogen-containing heavy metal complex was analyzed. The results showed that the degradation pathway was mainly achieved by hydroxyl radical. The reduction process of the cathode was analyzed by means of XPS characterization.
【學位授予單位】：華北理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：X52

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