【作者】 温志忠；

【导师】 李梦耀；

【作者基本信息】 长安大学 ， 应用化学， 2010， 硕士

【摘要】 氯酚(Chlorophenols, CPs)难溶于水,在中性水体中常以酚钠形式存在,具有很强的“三致”效应,被许多国家列入优先污染物和持久性有机污染物黑名单。降解是去除环境中氯酚钠的最有效方法之一,因此,研究氯酚钠的降解具有重要意义。氯酚钠类化合物有很多种,本文选取环境中常见的4-氯酚钠、2,4-二氯酚钠、五氯酚钠以及这三种氯酚钠按一定比例配成混合氯酚钠为研究对象,采用异相Fenton试剂光催化降解氯酚钠。本文分别以螯合树脂、4A分子筛、Y分子筛、活性氧化铝为催化剂载体,采用浸渍法制备了Fe(Ⅱ)—螯合树脂、Fe(Ⅱ)—4A分子筛、Fe(Ⅱ)—Y分子筛、Fe(Ⅱ)-Al2O3、Fe(Ⅲ)—Y分子筛。通过对比这五种催化剂对氯酚钠的吸附量和对氯酚钠的光催化降解性能测定,得出Fe(Ⅱ)—Y分子筛对氯酚钠的吸附量最小,在光催化降解试验中表现出最好的催化活性。同时在对Fe(Ⅱ)—Y分子筛的循环试验研究,发现经过简单的处理便能保持催化剂的良好活性,具有很大的适用性。具有良好催化活性的Fe(Ⅱ)—Y分子筛和溶液中的过氧化氢构成了异相Fenton试剂,在紫外光照射下,进行异相UV-Fenton光协同催化氧化降解氯酚钠的研究。单因素试验考察了过氧化氢浓度、催化剂量、氯酚钠初始浓度和溶液pH值对4种氯酚钠光催化降解的影响；结果研究表明过氧化氢浓度和Fe(Ⅱ)—Y分子筛量对氯酚钠的影响较大,氯酚钠初始浓度和pH值对氯酚钠降解的影响较小；共存离子Na+、Cl-、K+、SO42-、Mg2+、Zn2+等于氯酚钠50倍质量分率以下对降解没有干扰,NO3-和NH4+有干扰；在UV、H2O2、UV/H2O2、H2O2/Fe(Ⅱ)-Y分子筛、UV/H2O2/Fe(Ⅱ)-Y分子筛五种体系中,以UV/H2O2/Fe(Ⅱ)-Y分子筛反应体系降解效果最好。本文还利用异相Fenton法对含氯酚钠废水的处理进行了初步工艺设计。更多还原

【Abstract】 Chlorophenols(CPs)is insoluble in water, The formation is PCP-Na in the neutral Water, with a very strong sense of "three to" effect,Many countries included in the priority pollutants and POPs blacklist. Degradation is one of the most effective methods which remove the sodium pentachlorophenate in the environment, therefore, the study of sodium pentachlorophenate degradation is of great significance. chlorophenols compounds are many, this paper select 4-CP-Na,2,4-DCP,PCP, and CPs-Na which are common in the environment as the beau of research,using heterogeneous Fenton reagent catalyzed oxidation to degradate sodium chlorophenols.This paper respectively use Chelating resin,4A molecular sieve, Fe(Ⅱ)-Y molecular sieve, activated alumina as the carrier, and prepare Fe(Ⅱ)-Chelating resin, Fe(Ⅱ)-4A molecular sieve, Fe(Ⅱ)-Y molecular sieve, Fe(Ⅱ)-Al2O3, Fe(Ⅲ)-Y molecular sieve. By comparing the adsorption of five catalyst and the test of catalyzed oxidation to degradate sodium Chlorophenols. To draw a conclusion that adsorption of Fe(Ⅱ)-Y molecular sieve is lowest,and capacity of the CPs-Na is best. At the same time in the Fe(Ⅱ)-Y molecular sieve cycle pilot study found that the treatment will be maintained through simple good catalyst activity, has great applicability.Fe(Ⅱ)-Y molecular sieve which have better catalytic antibody and hydrogen peroxide constitute heterogeneous Fenton reagents, to study the photocatalytic degradation of CPs-Na, Single factor test inspected the effects of the concentration of hydrogen peroxide, the quality of Fe(Ⅱ)-Y molecular sieve, the initial concentration of CPs-Na, pH value for degradation; study results shows that the concentration of hydrogen peroxide and the quality of Fe(Ⅱ)-Y molecular sieve play greater impact on CPs-Na, the initial concentration of CPs-Na and initial pH value on degradation of CPs-Na has little effect; coexistent ions Na+、Cl-、K+、SO42-、Mg2+、Zn2+which Quality-rate is under 50 times to PCP-Na have not interference, and NO3-、NH4+、have interference;the reaction system of UV/H2O2/Fe(Ⅱ)-Y molecular sieve play a best effect in the five different system. This paper also research a preliminary process design for wastewater treatment of CPs-Na using heterogeneous Fenton method.更多还原