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采用US/Fe3+/H2O2体系超声催化降解甲基橙,考察了超声波功率、Fe3+初始质量浓度、H2O2用量、甲基橙溶液的初始质量浓度及初始pH值对超声催化降解甲基橙的影响,初步探讨了其降解动力学规律。结果表明,US/Fe3+/H2O2体系能有效降解甲基橙,且超声波与Fenton试剂对甲基橙废水的降解存在强烈的协同作用;在pH=3、超声波功率500 W、Fe3+和H2O2的初始质量浓度分别为30 mg/L和150 mg/L时,对含30 mg/L的甲基橙溶液降解120 min,其去除率达到99.5%;甲基橙的超声催化降解符合一级反应动力学规律,且甲基橙的一级反应速率常数随其初始质量浓度增大而降低。 相似文献
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为了进一步探讨Fenton法对某些难降解有机物的降解效果,研究影响降解的诸多因素,以甲基橙模拟染料废水为研究对象,以色度和COD去除率为检测指标,研究了Fenton反应中pH值、H2O2浓度、Fe2+离子浓度、反应时间、温度对甲基橙模拟染料废水脱色率及COD去除率的影响规律.结果表明:Fenten试剂可有效地去除甲基橙模拟染料废水中的色度和COD.染料浓度为200mg/L时,在pH=4、20℃、H2O2=(浓度为30%)投量为0.6mL/L、硫酸亚铁投量为200mg/L时,反应60min,甲基橙模拟染料废水的色度去除率可以达到99.66%,COD的去除率可达88%. 相似文献
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研究了微波、膨胀石墨和Fenton协同催化氧化法处理甲基橙(MO)废水工艺,探讨了各种因素对废水脱色效果的影响。结果表明,微波-膨胀石墨-Fenton试剂氧化体系产生了明显的协同效应,能高效快速降解废水中的MO。在优化工艺条件下,即在50 mL初始pH为4、MO质量浓度为450 mg/L的废水中,膨胀石墨用量1 g/L、微波辐射功率259 W、微波辐射9 min、双氧水用量为3 mL/L、n(H2O2):n(Fe2+)=40:1条件下,甲基橙脱色率达到了99.8%。 相似文献
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以物质的量比为1∶1的Bi(NO3)3.5H2O和Na2SnO3.3H2O为原料,采用微波水热法合成Bi2Sn2O7粉体。采用XRD、SEM对粉体的晶相和形貌进行了表征,并以甲基橙为目标污染物,测试粉体的光催化性能。研究了合成时间、合成温度等因素对样品催化性能的影响,同时以KI、NBT及乙腈作为抑制剂,检测光催化过程产生的活性物质。结果表明:200℃、30 min微波水热合成的2 g/L Bi2Sn2O7粉体在暗光条件下搅拌2 h,对20 mg/L甲基橙溶液的吸附率为40%,将其置于250 W的卤素灯下光照2 h,甲基橙溶液的脱色率达95%以上。活性物种的检测表明光催化过程产生的主要活性物种为·OH和·O2-。 相似文献
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以粉末活性炭(PAC)和颗粒活性炭(GAC)为载体,采用浸渍焙烧法制备了负载铜氧化物的活性炭催化剂,考察了其表面结构、元素组成及BET参数;以腐殖酸模拟废水为对象,研究了微波?载铜活性炭催化氧化降解腐殖酸的效果和影响因素,探讨了微波?催化氧化协同H2O2降解腐殖酸的机理. 结果表明,载铜活性炭比未负载铜的活性炭对腐殖酸的降解率更高,且Cu/PAC的催化效果远优于Cu/GAC,两种催化剂最佳的微波?催化氧化条件分别为Cu/PAC投加量1 g/L, H2O2投加量0.9 mL/L, pH=3,微波功率400 W,微波时间4 min和Cu/GAC投加量8 g/L, H2O2投加量1.5 mL/L, pH=6,微波功率400 W,微波时间4 min,该条件下腐殖酸的去除率分别为93.91%和91.59%. 微波、H2O2和催化剂协同作用对腐殖酸高效降解有决定性作用. 相似文献
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均相催化与多相催化降解甲基橙废水 总被引:6,自引:0,他引:6
在强氧化剂的存在下,采用多种金属离子对甲基橙废水进行催化氧化,使之降解脱色。结果表明,Fe3 、Cu2 能够有效地催化氧化反应,在20min左右即可使甲基橙脱除率达到99%以上.而Mn2 、Ni2 、pb2 等在实验时间内基本没有催化作用。温度、H2O2用量、以及金属离子用量对催化氧化都有影响,较高的温度可以大大加快反应的速度。80℃下.Fe3 及Cu2 使用量10-4mol,H2O2使用量0.6mL即可达到满意的脱除速率与效率。将Fe3 、Cu2 负载于活性炭上,用负载后的活性炭对甲基橙废水进行处理,同样可以起到催化氧化的作用,并且负载量的大小对催化氧化的效果有所影响。4g活性炭在100mL1%的Fe2(SO4)3及CuSO4溶液中浸溃24h,能够取得最好的催化效果。 相似文献
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The initiation temperature of methane partial oxidation was markedly lowered by platinum wire placed upstream of a high pressure reactor. Added hydrogen in the reactant gas promoted the methanol selectivity. The radicals formed on the platinum surface were desorbed from it and initiated the reaction. 相似文献
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石油开采、集输、加工过程中会面临复杂的工况条件,原油中的天然表面活性剂与人工添加乳化剂以及纳微米固体颗粒共同形成石油Pickering乳液,使得油水体系呈稳定的水包油(O/W)、油包水(W/O)或多重乳化状态。油水乳状液作为注水采油的主要产物,其高效破乳是石油工业链条中的普遍需求。目前对于石油Pickering的破乳仍然借鉴普通油水乳液的方法,而对于成因复杂的油水乳状液,以去除成膜乳化剂为目标的氧化破乳法比传统破乳法的效果更佳。为此,本文基于高效的氧化破乳机制,介绍了石油Pickering乳液的特点及危害,与非氧化反应类型的传统化学破乳法进行对比,综述了分子氧化、光催化氧化、电化学氧化三类技术对于不同来源及特征的油水乳状液的破乳进展。通过对每种方法的机理过程、应用实例、优缺点等方面详细分析,总结了分子氧化、光催化氧化、电化学氧化在石油Pickering乳液破乳中的局限性,并对今后如何实现石油Pickering乳液精准破乳提出展望。 相似文献
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氧气氧化是PTA氧化工艺的发展方向 总被引:2,自引:0,他引:2
用氧气代替空气作分子氧化剂,是石油化学工业的一个趋势。生产PTA用氧气氧化PX工艺能增加反应速率,缓和反应条件,减少副反应,降低消耗,提高产品质量,提高反应设备生产强度,有利于环境保护。分析氧气氧化工艺的安全性和经济性,指出该工艺有良好的工业应用前景,是PTA氧化工艺的发展方向。 相似文献
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The kinetics of biocatalytic methane oxidation should be known to make use of this process in environmental biotechnology.
Here, biocatalytic methane oxidation is described using multisubstrate kinetic models (studies were performed at 30°C). The
dependence of the specific growth rate of microorganisms (biomass buildup per unit time divided by the amount of biomass)
on the methane and oxygen concentrations in the culture liquid is best describable in terms of the Moser-Moser multisubstrate
kinetic model. The methane and oxygen consumption coefficients and the carbon dioxide yield coefficient have been determined.
These data are used to construct a mathematical model for heterogeneous biocatalytic methane oxidation. With this model, it
is possible to predict the behavior of the biocatalytic system under given conditions. 相似文献
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Karishma Irani William S. Epling Richard Blint 《Applied catalysis. B, Environmental》2009,92(3-4):422-428
The effect of propylene concentration on NO oxidation as a function of temperature and position over a model Pt-Pd/Al2O3 diesel oxidation catalyst was investigated. Propylene had an apparent inhibition effect on NO oxidation. This apparent inhibition is a result of NO2, as the NO oxidation product, acting as an oxidant in the reaction with propylene. This was verified with experiments that included NO2, and a resulting significant temperature decrease in the onset of NO2 reduction when propylene was present. Furthermore, increasing amounts of propylene further decreased the NO2 reduction temperature. Similar results were observed with m-xylene and dodecane addition as well. The results also demonstrate that NO2 was consumed preferentially relative to O2 during hydrocarbon oxidation. With low inlet levels of O2, the addition of NO2 apparently inhibited propylene oxidation after the onset of NO2 reduction. This subsequent inhibition was due to the NO formed, demonstrating that propylene results in reduced NO2 outlet levels while NO inhibits propylene oxidation. 相似文献
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Kupan A Saulière A Broussy S Seguy C Pratviel G Meunier B 《Chembiochem : a European journal of chemical biology》2006,7(1):125-133
The degeneracy of the guanine radical cation, which is formed in DNA by oxidation of guanine by electron transfer, was studied by a detailed analysis of the oxidation products of guanine on oligonucleotide duplexes and by labeling experiments. It was shown that imidazolone, the major product of guanine oxidation, is formed through a one-electron oxidation process and incorporates one oxygen atom from O2. The formation of 8-oxo-7,8-dihydroguanine by a two-electron oxidation process was a minor pathway. The two-electron oxidation mechanism was also evidenced by the formation of a tris(hydroxymethyl)aminomethane adduct. 相似文献
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采用氧化诱导期(OIT)法探讨了聚烯烃管材在加工过程中的降解反应及其影响因素,对交联聚乙烯管材进行4点温度OIT测试,并分析在所拟合的直线方程中与抗氧剂损耗活性相关的斜率对热氧稳定性的影响,同时外推使用温度下的热氧寿命,并以95℃热水浸泡后200℃时的OIT保留率作为辅助手段,找出内在关联,建立评价方法。 相似文献