光助非均相Fenton脫色有機染料的研究
發(fā)布時間：2018-09-14 16:24
【摘要】：我國是有機染料生產(chǎn)和使用的大國,在生產(chǎn)和使用有機染料的過程中產(chǎn)生的廢水是造成環(huán)境污染的一個重要方面,因此針對有機染料廢水的處理凈化研究非常必要,其中利用光助非均相Fenton反應(yīng)體系處理染料廢水是近年來研究的熱點。有機染料依據(jù)染料分子在溶液中的解離狀態(tài)可以將其主要分為陽離子染料及陰離子染料,本文主要選取陽離子染料羅丹明B、陽離子紅X-GRL及陰離子染料酸性品紅為研究對象,研究利用光助非均相Fenton體系對上述三種染料進行脫色的效果、反應(yīng)動力學(xué)以及反應(yīng)機理,以期對處理和凈化陰、陽兩種不同離子類型的有機染料廢水提供一定程度的理論指導(dǎo)和試驗依據(jù)。本文利用振蕩浸漬法實現(xiàn)了Na-Y型分子篩和Ls-5000氨基磷酸型螯合樹脂對Fe2+的負(fù)載,制備了Fe2+/NaY分子篩及Fe2+/Ls-5000螯合樹脂型兩種不同的非均相Fenton催化劑,并使用這兩種催化劑對陰、陽離子染料的吸附和光催化氧化性能進行了研究,結(jié)果表明制備的催化劑對羅丹明B、陽離子紅X-GRL及酸性品紅染料均具有不同程度的吸附和光催化氧化效能,可用于上述三種染料的脫色處理過程,且Fe2+/NaY分子篩催化劑具有一定的重復(fù)利用效能,有效避免了環(huán)境的二次污染。使用制備的兩種催化劑分別對羅丹明B、陽離子紅X-GRL及酸性品紅染料進行光助非均相Fenton脫色的研究。通過催化劑質(zhì)量、H2O2體積、可見光照的功率、染料的初始濃度及pH等單因素試驗結(jié)果確立影響羅丹明B、陽離子紅X-GRL以及酸性品紅脫色率較大的四個因素進行正交試驗,即催化劑質(zhì)量、溶液pH、H2O2的體積以及光照功率,獲得脫色上述三種染料的最佳工藝條件。通過對比脫色反應(yīng)前后染料紫外-可見吸收光譜發(fā)現(xiàn)可見光/Fe2+-NaY分子篩/H2O2和可見光/Fe2+-Ls-5000螯合樹脂/H2O2體系均對羅丹明B、陽離子紅X-GRL及酸性品紅分子結(jié)構(gòu)中的發(fā)色基團進行了顯著的氧化破壞,得到較高的脫色率。論文還分析討論了可見光/Fe2+-NaY分子篩/H2O2和可見光/Fe2+-Ls-5000螯合樹脂/H2O2兩個反應(yīng)體系脫色羅丹明B、陽離子紅X-GRL以及酸性品紅的動力學(xué)及反應(yīng)機理;認(rèn)為脫色反應(yīng)過程包括吸附作用和羥基自由基的氧化作用。
[Abstract]:China is a large country in the production and use of organic dyes. The wastewater produced in the process of producing and using organic dyes is an important aspect of environmental pollution. Therefore, it is necessary to study the treatment and purification of organic dyes wastewater. Among them, the treatment of dye wastewater by photo-assisted heterogeneous Fenton reaction system is a hot topic in recent years. Organic dyes can be mainly divided into cationic dyes and anionic dyes according to the dissociation state of dye molecules in solution. In this paper, cationic dyes Rhodamine B, cationic red X-GRL and anionic dye acid fuchsin are selected as research objects. The decolorization effect, reaction kinetics and reaction mechanism of the above three dyes by photo-assisted heterogeneous Fenton system were studied. The organic dye wastewater with two different ion types provides some theoretical guidance and experimental basis. In this paper, Na-Y molecular sieve and Ls-5000 aminophosphoric acid chelating resin were supported on Fe2 by oscillatory impregnation method. Two heterogeneous Fenton catalysts, Fe2 / nay molecular sieve and Fe2 / Ls-5000 chelate resin, were prepared. The adsorption and photocatalytic oxidation properties of cationic dyes were studied. The results showed that the prepared catalysts had different adsorption and photocatalytic effects on Rhodamine B, cationic red X-GRL and acid fuchsin dyes. It can be used in the decolorization process of the above three dyes, and the Fe2 / nay zeolite catalyst has a certain reuse efficiency, which effectively avoids the secondary pollution of the environment. The photo-assisted decolorization of Rhodamine B, cationic red X-GRL and acid fuchsin dye with heterogeneous Fenton was studied using two kinds of catalysts. Four factors affecting the decolorization rate of Rhodamine B, cationic red X-GRL and acid fuchsin were determined by single factor test, such as the volume of H _ 2O _ 2, the power of visible light, the initial concentration of dye and pH. The optimum conditions for decolorizing the above three dyes were obtained, such as the mass of catalyst, the volume of solution pH,H2O2 and the illumination power. By comparing the UV-Vis absorption spectra of dyes before and after decolorization reaction, it was found that both visible / Fe _ 2-NaY molecular sieve / H _ 2O _ 2 and visible light / Fe _ 2-Ls-5000 chelating resin / H _ 2O _ 2 system had chromophore groups in Rhodamine B, cationic red X-GRL and acidic fuchsin molecular structure. The mass was destroyed significantly by oxidation. Higher decolorization rate was obtained. The kinetics and reaction mechanism of decolorization of Rhodamine B, cationic red X-GRL and acid fuchsin by visible light / Fe _ 2-NaY molecular sieve / H _ 2O _ 2 and visible light / Fe _ 2-Ls-5000 chelating resin / H _ 2O _ 2 were also discussed. The decolorization process includes adsorption and hydroxyl radical oxidation.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：O643.36;X788
本文編號：2243241
[Abstract]:China is a large country in the production and use of organic dyes. The wastewater produced in the process of producing and using organic dyes is an important aspect of environmental pollution. Therefore, it is necessary to study the treatment and purification of organic dyes wastewater. Among them, the treatment of dye wastewater by photo-assisted heterogeneous Fenton reaction system is a hot topic in recent years. Organic dyes can be mainly divided into cationic dyes and anionic dyes according to the dissociation state of dye molecules in solution. In this paper, cationic dyes Rhodamine B, cationic red X-GRL and anionic dye acid fuchsin are selected as research objects. The decolorization effect, reaction kinetics and reaction mechanism of the above three dyes by photo-assisted heterogeneous Fenton system were studied. The organic dye wastewater with two different ion types provides some theoretical guidance and experimental basis. In this paper, Na-Y molecular sieve and Ls-5000 aminophosphoric acid chelating resin were supported on Fe2 by oscillatory impregnation method. Two heterogeneous Fenton catalysts, Fe2 / nay molecular sieve and Fe2 / Ls-5000 chelate resin, were prepared. The adsorption and photocatalytic oxidation properties of cationic dyes were studied. The results showed that the prepared catalysts had different adsorption and photocatalytic effects on Rhodamine B, cationic red X-GRL and acid fuchsin dyes. It can be used in the decolorization process of the above three dyes, and the Fe2 / nay zeolite catalyst has a certain reuse efficiency, which effectively avoids the secondary pollution of the environment. The photo-assisted decolorization of Rhodamine B, cationic red X-GRL and acid fuchsin dye with heterogeneous Fenton was studied using two kinds of catalysts. Four factors affecting the decolorization rate of Rhodamine B, cationic red X-GRL and acid fuchsin were determined by single factor test, such as the volume of H _ 2O _ 2, the power of visible light, the initial concentration of dye and pH. The optimum conditions for decolorizing the above three dyes were obtained, such as the mass of catalyst, the volume of solution pH,H2O2 and the illumination power. By comparing the UV-Vis absorption spectra of dyes before and after decolorization reaction, it was found that both visible / Fe _ 2-NaY molecular sieve / H _ 2O _ 2 and visible light / Fe _ 2-Ls-5000 chelating resin / H _ 2O _ 2 system had chromophore groups in Rhodamine B, cationic red X-GRL and acidic fuchsin molecular structure. The mass was destroyed significantly by oxidation. Higher decolorization rate was obtained. The kinetics and reaction mechanism of decolorization of Rhodamine B, cationic red X-GRL and acid fuchsin by visible light / Fe _ 2-NaY molecular sieve / H _ 2O _ 2 and visible light / Fe _ 2-Ls-5000 chelating resin / H _ 2O _ 2 were also discussed. The decolorization process includes adsorption and hydroxyl radical oxidation.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：O643.36;X788
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