本文關(guān)鍵詞：納米零價鐵對陽離子染料脫色降解的研究　出處：《昆明理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 納米零價鐵 PAA改性 綠色合成 亞甲基藍(lán) 孔雀綠

【摘要】：染料廢水具有較高的穩(wěn)定性和復(fù)雜的芳香結(jié)構(gòu)特點(diǎn),對染料廢水的降解成為了關(guān)注熱點(diǎn)。由于水體中存在染料,它的顏色直接影響水生生物的光合作用,其有毒性的致癌性則會影響水生生態(tài)系統(tǒng)和食物鏈,還會威脅到人類的健康。對于染料的降解,國內(nèi)外研究者采用了不同方法,使難降解的有機(jī)物化學(xué)結(jié)構(gòu)改變,提高了廢水的生化性,對其毒性進(jìn)行了消除或降低,以便使難以降解的有機(jī)物在后續(xù)的生化處理中得到徹底降解。近年來,納米零價鐵顆粒(nZVI)的高表面積體積比提供更多的活性位點(diǎn),能有效地降解很多污染物等特點(diǎn)引起了廣泛的重視。本文以陽離子染料亞甲基藍(lán)和孔雀綠作為研究對象,利用改性后的納米零價鐵顆粒和通過綠茶提取物合成的納米零價鐵顆粒,對兩種陽離子染料進(jìn)行脫色降解反應(yīng),具體研究內(nèi)容和結(jié)果如下：1.利用納米零價鐵去除水中各類污染物是近年來的研究熱點(diǎn),但納米零價鐵顆粒在水中的團(tuán)聚會導(dǎo)致反應(yīng)活性降低,本研究通過在納米鐵顆粒制備過程中添加分散劑聚丙烯酸(PAA),提高納米零價鐵的分散性,強(qiáng)化其在水中反應(yīng)活性,通過聚丙烯酸改性合成納米零價鐵顆粒(PAA-Fe),并首次用于降解水中亞甲基藍(lán)。對其進(jìn)行掃描電鏡(SEM)、透射電鏡OEM)、X射線衍射(XRD)和比表面積表征分析,分析結(jié)果表明,與未改性原始納米零價鐵顆粒相比,PAA-Fe顆粒表面較光滑,團(tuán)聚減少、顆粒粒徑減小,比表面積增大。2.改性劑PAA添加濃度為0.1%時,經(jīng)過60min降解反應(yīng),PAA改性納米鐵顆粒對亞甲基藍(lán)的脫色率為98.84%,較未改性顆粒脫色率提高了27.32%。改性納米鐵顆粒對亞甲基藍(lán)的脫色效果受初始溶液的pH值、初始溶液的濃度、PAA-Fe投加量和反應(yīng)溫度影響。PAA-Fe與亞甲基藍(lán)的脫色反應(yīng)符合假一級反應(yīng)動力學(xué)規(guī)律,活化能為26.53 kJ/mol。3.在室溫下以綠茶提取物作為還原劑制備納米零價鐵(G-Fe NPs),用于對孔雀綠進(jìn)行脫色。因?yàn)榫G茶提取物包含了豐富的咖啡因／多酚類,在合成納米鐵時即作為還原劑又作為覆蓋劑。通過掃描電鏡(SEM)和透射電鏡(TEM), G-Fe NPs顆粒與硼氫化物合成的納米鐵顆粒(K-Fe NPs)對比,G-Fe NPs顆粒的團(tuán)聚現(xiàn)象減少,并且反應(yīng)活性有所增加。紅外光譜(FTIR)分析可知G-Fe NPs表面有多酚化合物的基團(tuán)鍵,說明了綠茶提取物可當(dāng)作覆蓋劑／穩(wěn)定劑。4.經(jīng)過60min降解反應(yīng),G-Fe顆粒對孔雀綠的脫色率為90.70%,相較K-Fe顆粒脫色率提高了27.44%。分別考察了G-Fe顆粒對孔雀綠的反應(yīng)受溶液的pH、孔雀綠的初始濃度、G-Fe顆粒的投加量、反應(yīng)溫度的影響。實(shí)驗(yàn)結(jié)果表明,G-Fe NPs投加量和溫度的增加,脫色率隨著增大,而脫色率卻隨孔雀綠的初始濃度和pH的增大而降低。動力學(xué)研究說明G-Fe NPs對孔雀綠的脫色反應(yīng)呈一級指數(shù)衰減趨勢。
[Abstract]:Dye wastewater has high stability and complex aromatic structure characteristics, the degradation of dye wastewater has become a hot spot. Because of the existence of dyes in water, its color directly affects the photosynthesis of aquatic organisms. Its toxic carcinogenicity will affect aquatic ecosystem and food chain and threaten human health. Researchers at home and abroad have adopted different methods for the degradation of dyes. The chemical structure of refractory organic compounds is changed, the biochemistry of wastewater is improved, and its toxicity is eliminated or reduced, so that the refractory organic compounds can be completely degraded in the subsequent biochemical treatment. Nanocrystalline zero-valent iron particles (nZVI) have higher surface area volume than provide more active sites. In this paper, the cationic dye methylene blue and malachite green were used as the research objects. Two kinds of cationic dyes were decolorized and degraded by the modified nano-zero-valent iron particles and the nano-zero-valent iron particles synthesized by green tea extract. The specific research contents and results are as follows: 1. The removal of various pollutants in water by using nano-zero-valent iron is a hot topic in recent years, but the agglomeration of nano-zero-valent iron particles in water leads to the decrease of reaction activity. In this study, the dispersing agent polyacrylate PAA was added in the preparation of nano-iron particles to improve the dispersion of nano-zero-valent iron and enhance its reactivity in water. Nano-sized zero-valent iron particles (PAA-FeO) were synthesized by modification of polyacrylic acid and used for degradation of methylene blue in water for the first time. The results of X-ray diffraction (XRD) and specific surface area analysis showed that the surface surface of PAA-Fe particles was smooth, the agglomeration was less and the particle size was smaller than that of unmodified nano-zero-valent iron particles. When the concentration of modifier PAA was 0.1, the decolorization rate of methylene blue was 98.84% after 60min degradation reaction. The decolorization rate of the modified nanoparticles was 27.32 higher than that of the unmodified particles. The decolorization effect of the modified nano-iron particles on methylene blue was affected by the pH value of the initial solution and the initial concentration of the solution. The decolorization reaction between methylene blue and PAA-Fe was in accordance with the pseudo-first-order reaction kinetics. The activation energy is 26.53 kJ / mol 路3.The nanometer zero-valent iron (G-Fe NPs) was prepared by using green tea extract as reducing agent at room temperature. Used to decolorize malachite green because the green tea extract contains abundant caffeine / polyphenols. Nanocrystalline iron is used both as a reducer and as a covering agent by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The agglomeration of G-Fe NPs particles was decreased compared with that of nano-iron particles synthesized by borohydride. The agglomeration of G-Fe NPs particles was decreased compared with that of G-Fe NPs particles. FTIR analysis showed that there were group bonds of polyphenols on the surface of G-Fe NPs. The results showed that green tea extract could be used as covering agent / stabilizer. The decolorization rate of G-Fe particles on malachite green was 90.70% after 60 min degradation. Compared with K-Fe particles, the decolorization rate of G-Fe particles was increased by 27.44%. The pH of solution and the dosage of G-Fe particles were investigated respectively in the reaction of G-Fe particles to malachite green. The experimental results show that the decolorization rate increases with the increase of the dosage and temperature of G-Fe NPs. However, the decolorization rate decreased with the increase of initial concentration and pH of malachite green. Kinetic study showed that the decolorization of malachite green by G-Fe NPs showed a first-order exponential decolorization trend.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X788

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