本文選題：黃腐酸 + Fenton氧化�。� 參考：《青島科技大學(xué)》2015年碩士論文

【摘要】：黃腐酸是腐植酸中水溶性的部分,其廣泛分布在天然水體中。水體中黃腐酸濃度超過一定限度時(shí),將會(huì)嚴(yán)重影響人體健康并造成環(huán)境污染。例如黃腐酸可以同水中氯氣反應(yīng),生成致癌性的含氯化合物。目前常見的黃腐酸降解方法主要包括生物法、化學(xué)法和高級(jí)氧化法。其中Fenton氧化法、電-Fenton氧化法和過硫酸鹽氧化法作為高級(jí)氧化法的代表,具有反應(yīng)快速、操作簡(jiǎn)便以及環(huán)境友好等特點(diǎn),其在去除黃腐酸應(yīng)用上具有較好的前景。本課題采用Fenton氧化法研究了H2O2濃度,H2O2/Fe2+的摩爾比和混凝作用對(duì)TOC去除率的影響；同時(shí)利用紫外-可見光譜考察了黃腐酸去除效果。采用電-Fenton法考察了不同陰極條件下,電壓、pH值和Fe2+初始濃度對(duì)TOC去除的影響；采用過硫酸鹽氧化法考察了過硫酸鈉、Fe2+初始濃度和溫度對(duì)TOC去除效果的影響。得出以下結(jié)論：采用Fenton氧化法降解100 mg/L黃腐酸溶液：在pH=3.0, H2O2初始濃度為400 mg/L, H2O2/Fe2+最佳摩爾比為10：1時(shí),降解240 min條件下TOC去除率達(dá)到88.3%。采用電-Fenton氧化法降解100 mg/L黃腐酸溶液：以修飾羥基化多壁碳納米管的多孔碳素電極為陰極,Ti/SnO2-Sb2O5-IrO2為陽(yáng)極構(gòu)建的電-Fenton氧化系統(tǒng)降解黃腐酸溶液,當(dāng)pH=3、直流電壓為3.0 V、Fe2+投加量為0.8 mmol/L條件下,降解240 min時(shí)TOC去除率達(dá)到74.5%；利用過硫酸鹽氧化法降解100 mg/L黃腐酸溶液,當(dāng)pH值為3.0,水浴溫度為50℃,Fe2+初始濃為5 mmol/L, Na2S2O8濃度為2000 mg/L條件下,反應(yīng)進(jìn)行240 min時(shí)TOC去除率達(dá)到55.9%。研究結(jié)果表明,Fenton氧化對(duì)黃腐酸的去除效果最好,但其要求酸性的反應(yīng)環(huán)境,并產(chǎn)生大量污泥；電-Fenton氧化對(duì)黃腐酸的去除效果次之,該法產(chǎn)生污泥相對(duì)較少,且無需外加H2O2;過硫酸鹽氧化對(duì)黃腐酸的去除效果最差,氧化劑投加量大。綜合比較,前兩者是降解含黃腐酸廢水可行的選擇。
[Abstract]:Fulvic acid is a water-soluble part of humic acid, which is widely distributed in natural water. When the concentration of fulvic acid in water exceeds a certain limit, it will seriously affect human health and cause environmental pollution. For example, fulvic acid can react with chlorine in water to form carcinogenic chloride compounds. At present, the common degradation methods of fulvic acid mainly include biological method, chemical method and advanced oxidation method. Among them, Fenton oxidation, electro-Fenton oxidation and persulfate oxidation are the representatives of advanced oxidation methods, which have the advantages of rapid reaction, simple operation and environmental friendliness. It has a good prospect in the application of the removal of fulvic acid. The effects of molar ratio of H2O2 concentration of H _ 2O _ 2 / Fe _ 2 and coagulation on the removal rate of TOC were studied by Fenton oxidation method, and the removal effect of fulvic acid was also investigated by UV-Vis spectra. The effects of voltage pH and initial concentration of Fe2 on TOC removal under different cathode conditions were investigated by electro-Fenton method, and the effects of initial concentration and temperature of sodium persulfate Fe2 on TOC removal were investigated by persulfate oxidation method. The following conclusions are drawn: degradation of 100 mg/L fulvic acid solution by Fenton oxidation method: when pH is 3.0, the initial concentration of H2O2 is 400 mg / L, the best molar ratio of H2O2/Fe2 is 10:1, the TOC removal rate reaches 88.3 under the condition of 240 min degradation. Degradation of 100 mg/L fulvic acid solution by electro-Fenton oxidation method: degradation of fulvic acid solution by electro-Fenton oxidation system with porous carbon electrode modified with hydroxylated multiwalled carbon nanotubes as cathode tir / SnO _ 2-Sb _ 2O _ 5-IrO _ 2 as anode. When pH is 3 and DC voltage is 3. 0 V / Fe2 = 0. 8 mmol/L, the TOC removal rate of 240 min is 74.5%, and the solution of 100 mg/L fulvic acid is degraded by persulfate oxidation. Under the conditions of pH 3.0, water bath temperature 50 鈩，

本文編號(hào)：1926858