Fenton氧化法深度处理丙烯腈废水的研究

以丙烯腈(AN)废水为研究对象,在正交实验基础上深入研究了Fenton反应体系中pH值、Fe2+浓度、H2O2浓度、温度、UV和C2O2-4对降解效果的影响,分析了不同因素作用机理,确定了最佳操作条件pH=3、[Fe2+]=400mg/L、[H2O2]=400mg/L、反应温度40℃,在此条件下丙烯腈降解率达80%以上。同时发现在紫外光、C2O2-4对Fenton试剂的协同作用下,降解率可提高10%左右。     

Fenton试剂-石灰法预处理土霉素废水

采用Fenton试剂-石灰法预处理土霉素废水,结果表明,在适宜条件下对不同浓度的废水进行处理,CODcr去除率可达71％以上,废水的可生化性(BOD5／CODcr)由0．1提高到0．4以上;实验还对土霉素纯品进行处理,通过对处理前后的Uv—Vis光谱分析证实了彻底去除土霉素是废水可生化性提高的主要原因。     

铁炭微电解/Fenton试剂预处理土霉素废水的研究

研究了铁炭微电解/Fenton试剂法工艺对高浓度难生化处理的土霉素废水预处理效果.结果表明,当原水COD在6 000 mg/L、pH值为2.2时,铁炭微电解反应时间为80 min,铁炭微电解对原水COD的去除率>40%;铁炭微电解出水再投加220 mg/L的H2O2(30%)进行Fenton试剂法处理,常温下反应50 min对原水COD的去除率可提高到75%以上.铁炭微电解 Fenton试剂联合工艺的处理效果好、运行稳定、成本低廉,适宜对难降解的土霉素废水的预处理.     

光助Fenton氧化法降解水中六氯苯的研究

采用光助Fenton氧化法处理六氯苯模拟废水,考察了反应时间、Fe3 与H2O2摩尔比、Fenton试剂用量、初始pH、六氯苯初始浓度、光强对六氯苯降解效果的影响,并初步探讨了六氯苯的降解动力学规律.结果表明.光助Fenton法降解六氯苯的最佳工艺条件为:紫外灯功率为300 W、Fe3 投加量为1.0 mmol/L、H2O2投加量为5.0 mmol/L、反应时间为60 min、初始pH为3,在此条件下,浓度为500μg/L的HCB的去除率可达91.3%.UV辐射与Fenton氧化对HCB的降解具有协同效应.光助Fenton法对HCB的降解符合一级反应动力学方程,表观速率常数为0.04 min-1,与Fenton法相比,提高了近9倍.     

Fenton氧化法深度处理丙烯腈废水的研究

以丙烯腈(AN)废水为研究对象，在正交实验基础上深入研究了Fenton反应体系中pH值、Fe^2 浓度、H2O2浓度、温度、uv和C2O^2-4对降解效果的影响，分析了不同因素作用机理，确定了最佳操作条件：pH=3、[Fe^2 ]=400mg／，L、[H2O2]=400mg／L、反应温度40℃，在此条件下丙烯腈降解率达80％以上。同时发现在紫外光、C2O^2-4对Fenton试剂的协同作用下，降解率可提高10％左右。     

Fenton和类Fenton氧化处理地下水中BTEX及其动力学

研究比较Fenton试剂和类Fenton试剂氧化处理地下水中苯、甲苯、乙苯和二甲苯(BTEX)的效果及动力学.结果表明,Fenton氧化处理BTEX较类Fenton效果好,且反应过程中体系均处于强氧化环境,pH值维持在3左右;Fenton和类Fenton氧化去除BTEX过程均符合二级反应动力学方程:1/C=kt+1/C...     

Fenton试剂氧化降解水中的盐酸四环素

利用Fenton试剂对水中盐酸四环素（TC）氧化降解,考察H2O2/Fe2+（摩尔比）、Fenton试剂投加量、溶液pH值对盐酸四环素去除的影响,研究了盐酸四环素降解过程及动力学特征。研究结果表明：对于初始浓度为0.10 mmol·L-1的盐酸四环素,最优反应条件为pH值3.0,H2O2/Fe2+=10：1（物质的量之比）,H2O2施加量1.58 mmol·L-1。在该条件下反应60 min,盐酸四环素降解率达88.47%,对应TOC去除率为18.48%;紫外可见光谱扫描结果表明氧化过程中盐酸四环素的共轭结构被首先破坏;分别采用一级和二级动力学方程拟合降解过程,结果表明反应过程遵循二级动力学模型。     

Fenton氧化法同时脱硫脱硝的实验研究

应用Fenton液相氧化吸收法进行同时脱硫脱硝实验。首先,利用单因素实验,分别考察了H2O2浓度、Fe2+投加量、初始pH值、UV照射和温度对脱硫脱硝的影响。结果表明,SO2和NO去除率随着H2O2浓度和Fe2+投加量的增大而提高;初始pH对SO2和NO的去除有较大影响;UV能促进SO2和NO的净化;温度对脱硫效率影响不大,但对NO的去除有显著作用,适当升温可以提高脱硝效率。随后,考察了SO2对NO去除率的影响。通过单独脱硝和同时脱硫脱硝的对比实验发现,SO2的加入对NO的去除有一定的促进作用,Fenton法可同时获得起始约80%的脱硝效率和98%以上的脱硫效率。     

含苯酚危险废物的改进型Fenton氧化处理研究

建立以EDTA钠铁作为催化剂的改进型Fenton氧化体系,研究改进型Fenton氧化处理含高浓度苯酚危险废物的影响因素、处理效果和控制参数。研究结果表明,针对含苯酚污染土壤的自配样,当EDTA钠铁投加量为2μmol/g,15%H2O2投加量为0.1 mL/g,体系含水率为33%左右,反应时间60 min时,苯酚(含量为2 mg/g)的氧化降解率可达90%以上,反应后的体系pH约为5.7,便于直接进行固化稳定化等后续处理。该处理过程较传统型Fenton体系温和、安全,且适用于中性pH的体系,可应用于高苯酚含量且以固相无机质为主体的危险废物的快速应急处理。     

UV/Fenton法处理间-甲酚废水

利用UV/Fenton工艺对模拟间-甲苯酚废水进行了处理,研究了H2O2加入量、FeSO4加入量、pH、原水初始COD值、环境温度、反应时间等因素对COD去除率的影响.实验表明：间-甲苯酚浓度为100mg/L、初始COD值251 mg/L的废水,在30℃下,pH为4.Q,[H2O2]/[Fe^2＋]=15（质量浓度比）,紫外灯照射3 h后,COD去除率达86.3%,若再经Ca（OH）2絮凝沉降,则COD去除率提高到92.6%.同时,对Fenton及UV/Fenton的处理效果进行了比较,实验表明：UV/Fenton的处理效果明显优于Fenton法.     

Kinetics of imidazolium-based ionic liquids degradation in aqueous solution by Fenton oxidation

In the last few years, several works dealing with Fenton oxidation of ionic liquids (ILs) have proved the capability of this technology for their degradation, achieving complete ILs removal and non-toxic effluents. Nevertheless, very little is known about the kinetics of this process, crucial for its potential application. In this work, the effect of several operating conditions, including reaction temperature (50–90 °C), catalyst load (10–50 mg L^?1 Fe³⁺), initial IL concentration (100–2000 mg L^?1), and hydrogen peroxide dose (10–200% of the stoichiometric amount for the complete IL mineralization) on 1-butyl-3-methylimidazolium chloride ([C₄mim]Cl) oxidation has been investigated. Under the optimum operating conditions (T = 90 °C; [Fe³⁺]₀ = 50 mg L^?1; [H₂O₂]₀ = 100% of the stoichiometric amount), the complete removal of [C₄mim]Cl (1000 mg L^?1) was achieved at 1.5-min reaction time. From the experimental results, a potential kinetic model capable to describe the removal of imidazolium-based ILs by Fenton oxidation has been developed. By fitting the proposed model to the experimental data, the orders of the reaction with respect to IL initial concentration, Fe³⁺ amount and H₂O₂ dose were found to be close to 1, with an apparent activation energy of 43.3 kJ mol^?1. The model resulted in a reasonable fit within the wide range of operating conditions tested in this work.     

电生成Fenton试剂光催化降解孔雀石绿的研究

为了提高染料废水的处理效果,采用电生成Fenton试剂光催化氧化系统对孔雀石绿模拟印染废水进行了降解研究,通过与无光照时的对比实验发现:光照能明显加快电生成Fenton试剂对孔雀石绿印染废水的降解脱色速率,20 min内脱色率达到98%以上,40 min内COD去除率达到80%以上,同时通过红外光谱、紫外-可见光谱等手段研究了光照与电生成Fenton试剂的协同作用,初步探讨了电生成Fenton试剂光催化降解孔雀石绿印染废水的反应机理,很好地实现了光催化与电化学氧化降解技术的联合应用。     

Chemical oxidative degradation of methyl tert-butyl ether in aqueous solution by Fenton's reagent

Degradation of methyl tert-butyl ether (MTBE) in aqueous solution by Fenton's reagent (Fe2+ and H2O2) was investigated. Effects of reaction conditions on the oxidation efficiency of MTBE by Fenton's reagent were examined in batch experiments. Under optimum conditions, 15 mM H2O2, 2 mM Fe2+, pH 2.8 and room temperature, the initial 1 mM MTBE solution was reduced by 99% within 120 min. Results showed that MTBE was decomposed in a two-stage reaction. MTBE was first decomposed swiftly based on a Fe2+/H2O2 reaction and then decomposed somewhat less rapidly based on a Fe3+/H2O2 reaction. The detection of Fe2+ also supported the theory of the two-stage reaction for the oxidation of MTBE by Fenton's reagent. The dissolved oxygen in the solution decreased rapidly in the first stage reaction, but it showed a slow increase in the second stage with a zero-order kinetics. A reaction mechanism involving two different pathways for the decomposition of MTBE by Fenton's reagent was also proposed. Chemicals including tert-butyl formate, tert-butyl alcohol, methyl acetate and acetone were identified to be the primary intermediates and by-products of the degradation processes.     

Hydrolysis and photolysis of oxytetracycline in aqueous solution

Oxytetracycline ((2Z,4S,4aR,5S,5aR,6S,12aS)-2-(amino-hydroxy-methylidene)-4-dimethylamino-5,6,10,11,12a-pentahydroxy-6-methyl-4,4a,5,5a-tetrahydrotetracene-1,3,12-trione) is a member of tetracycline antibiotics family and is widely administered to farm animals for the purpose of therapeutical treatment and health protection. Increasing attention has been paid to the environmental fate of oxytetracycline and other veterinary antibiotics with the occurrence of these antibiotics in the environment. The hydrolysis and photolysis degradation of oxytetracycline was investigated in this study. Oxytetracycline hydrolysis was found to obey the first-order model and similar rate constant values ranging from 0.094 ± 0.001 to 0.106 ± 0.003 day^{? 1} were obtained at different initial concentration ranging from 10 to 230 μ M. Solution pH and temperature were shown to have remarked effects on oxytetracycline hydrolysis. The hydrolysis in pH neutral solution appeared to be much faster than in both acidic and alkaline solutions. Oxytetracycline half-life decreased from 1.2 × 10² to 0.15 day with the increasing temperature from 4 ± 0.8 to 60 ± 1°C. The presence of Ca^{2 +} made oxytetracycline hydrolytic degradation kinetics deviate from the simple first-order model to the availability-adjusted first-order model and greatly slowed down the hydrolysis. Oxytetracycline photolysis was found to be very fast with a degradation rate constant at 3.61 ± 0.06 day^{? 1}, which is comparable to that of hydrolysis at 60°C. The presence of Ca^{2 +} accelerated oxytetracycline photolysis, implying that oxytetracycline become more vulnerable to sunlight irradiation after chelating with Ca^{2 +}. The photolysis may be the dominant degradation pathway of oxytetracycline in shallow transparent water environment.     

类Fenton试剂氧化降解土壤中PAHs及其影响因素研究

使用类Fenton试剂可以有效降解土壤中的多环芳烃（PAHs）。选择4种PAHs菲、芘、苯并[a]芘、茚并（1,2,3-cd）芘作为考察对象,研究了类Fenton试剂对土壤中PAHs的降解条件。单因素降解实验结果表明,在H2O2浓度为0.5mol/L,Fe（NO3）3浓度为0.1 mol/L,水土比为3∶1,反应时间为...     

低频超声辐照降解间苯二酚水溶液的研究

利用低频超声波对模拟间苯二酚废水进行研究,主要讨论间苯二酚本身性质以及超声操作声强对降解的影响,并通过自由基清除剂实验判定该反应的反应类型.结果表明,间苯二酚本身性质以及超声声强对间苯二酚的超声降解影响都比较大,并且该超声降解反应过程以自由基氧化反应为主,同时该反应遵循表观一级动力学反应特征.初始浓度为200mg/L的间苯二酚反应液经强度0.4 W/cm2的超声波辐照4 h后,降解率为48.6%.     

低频超声辐照降解间苯二酚水溶液的研究

利用低频超声波对模拟间苯二酚废水进行研究，主要讨论间苯二酚本身性质以及超声操作声强对降解的影响，并通过自由基清除剂实验判定该反应的反应类型。结果表明，间苯二酚本身性质以及超声声强对间苯二酚的超声降解影响都比较大，并且该超声降解反应过程以自由基氧化反应为主，同时该反应遵循表观一级动力学反应特征。初始浓度为200mg／L的间苯二酚反应液经强度0．4W／cm^２的超声波辐照4h后，降解率为48．6％。