基于过氧化物的高级氧化法降解黄腐酸的研究

发布时间：2018-05-23 23:44

  本文选题：黄腐酸 + Fenton氧化　； 参考：《青岛科技大学》2015年硕士论文

【摘要】：黄腐酸是腐植酸中水溶性的部分,其广泛分布在天然水体中。水体中黄腐酸浓度超过一定限度时,将会严重影响人体健康并造成环境污染。例如黄腐酸可以同水中氯气反应,生成致癌性的含氯化合物。目前常见的黄腐酸降解方法主要包括生物法、化学法和高级氧化法。其中Fenton氧化法、电-Fenton氧化法和过硫酸盐氧化法作为高级氧化法的代表,具有反应快速、操作简便以及环境友好等特点,其在去除黄腐酸应用上具有较好的前景。本课题采用Fenton氧化法研究了H2O2浓度,H2O2/Fe2+的摩尔比和混凝作用对TOC去除率的影响；同时利用紫外-可见光谱考察了黄腐酸去除效果。采用电-Fenton法考察了不同阴极条件下,电压、pH值和Fe2+初始浓度对TOC去除的影响；采用过硫酸盐氧化法考察了过硫酸钠、Fe2+初始浓度和温度对TOC去除效果的影响。得出以下结论：采用Fenton氧化法降解100 mg/L黄腐酸溶液：在pH=3.0, H2O2初始浓度为400 mg/L, H2O2/Fe2+最佳摩尔比为10：1时,降解240 min条件下TOC去除率达到88.3%。采用电-Fenton氧化法降解100 mg/L黄腐酸溶液：以修饰羟基化多壁碳纳米管的多孔碳素电极为阴极,Ti/SnO2-Sb2O5-IrO2为阳极构建的电-Fenton氧化系统降解黄腐酸溶液,当pH=3、直流电压为3.0 V、Fe2+投加量为0.8 mmol/L条件下,降解240 min时TOC去除率达到74.5%；利用过硫酸盐氧化法降解100 mg/L黄腐酸溶液,当pH值为3.0,水浴温度为50℃,Fe2+初始浓为5 mmol/L, Na2S2O8浓度为2000 mg/L条件下,反应进行240 min时TOC去除率达到55.9%。研究结果表明,Fenton氧化对黄腐酸的去除效果最好,但其要求酸性的反应环境,并产生大量污泥；电-Fenton氧化对黄腐酸的去除效果次之,该法产生污泥相对较少,且无需外加H2O2;过硫酸盐氧化对黄腐酸的去除效果最差,氧化剂投加量大。综合比较,前两者是降解含黄腐酸废水可行的选择。
[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，

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