共查询到18条相似文献,搜索用时 46 毫秒
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阳离子红染料的臭氧氧化动力学研究 总被引:4,自引:2,他引:2
在半序批式反应器中,研究了反应温度、pH、起始浓度和气体流量等对阳离子红 X-GRL 染料臭氧氧化的影响。在确定比相界面积、液相传质系数和化学计量比的基础上,运用双膜理论证明了臭氧与阳离子红 X-GRL的反应发生在液相主体、反应处于慢速反应动力学区域。反应动力学速度常数与温度和 pH 的关系为:k = 77505exp(?18062/ RT)[OH?]0.003 (L?mol?1?s?1),反应的活化能为 18.062kJ?mol?1。 相似文献
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文章研究了氧化石墨对模拟印染废水阳离子红X-GRL溶液的吸附性能。探讨了氧化石墨的用量、溶液的p H、溶液温度、吸附时间对吸附性能的影响,最终得到了氧化石墨对模拟印染废水阳离子红X-GRL溶液的最佳吸附条件,并对吸附机理进行了探讨。结果表明:对于一定浓度的阳离子红X-GRL溶液,随着氧化石墨用量的增加,氧化石墨对阳离子红X-GRL吸附量先增强后减弱;介质的p H在7~9的条件下,氧化石墨对阳离子红X-GRL吸附性能较好;随着吸附时间的增长,吸附量不断增大最后达到平衡值,一般情况下都在80分钟左右达到平衡,温度对吸附性能影响较小,在45℃时吸附性能相对较好。由X射线衍射图谱(XRD)和红外光谱(IR)得知,氧化石墨中大量的含氧官能团促进了对染料的吸附,其染料本身带正电荷也促进了对阴离子的吸附。 相似文献
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The ozonation of Cationic Red X-GRL in a semi-batch reactor was studied with variation of the gas flow rate, initial Cationic Red X-GRL concentration, temperature, and pH value. By the evaluation of the liquid mass transfer coefficient, the interfacial area, and the stoichiometric ratio between ozone and Cationic Red X-GRL, the rate constants and the kinetic regime of the reaction between ozone and Cationic Red X-GRL were investigated by applying the experimental data to a model based on the film mass transfer theory. The results obtained support a second order overall reaction, first order with respect to both ozone and dye, and the rate constants were correlated by a modified Arrhenius Equation of temperature and pH value with activation energy of 18.06kJ·mol-1. Hatta number of the reaction was found to be between 0.026 and 0.041, it indicates that the reaction occurs in the liquid bulk, corresponding to the slow kinetic regime. 相似文献
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以凹凸棒分散液为吸附剂, Fe2+/ATP为复合催化剂对印染废水中的阳离子红X-GRL进行处理实验。主要分析了Fe2+负载时间、反应温度和Fe2+溶液浓度对吸附性能的影响以及影响凹凸棒土联用Feton法与阳离子红反应的因数。实验结果显示,制备ATP/Fe2+的合适的条件为:凹凸棒土煅烧温度为400℃;负载铁时间为5 h;负载铁浓度为1500 mg/L;负载温度为80℃。 相似文献
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卟啉是一种具有良好光敏性的特殊大环共轭芳香化合物。文章利用活性自由基聚合的方法,以不对称羟基金属卟啉为原料,合成出具有温度响应性聚合物修饰的金属卟啉光敏剂,并通过核磁谱图分析证实了目标产物的结构。又以其作为光催化降解光敏剂,降解有机污染物亚甲基橙。考察不同光降解反应条件下,卟啉聚合物在氧化剂H_2O_2存在下,可见光照射下降解率最佳。同时也考察了不同温度、分子量、pH对光催化降解的影响。 相似文献
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考察了臭氧对阳离子红GTL、阳离子蓝FGL、阳离子桃红FG的色度脱除、溶液pH值和TOC浓度的变化情况,并对降解后溶液中的残留物进行了分析。结果发现,染料脱色效果明显,20min脱色率均达到79.5%以上;有酸性物质生成并使得溶液的pH值随反应时间下降;生成CO:或可挥发性的有机物使得溶液的TOC浓度逐渐降低,40minTOC浓度下降率均达到21.9%以上;TOC、pH与脱色率在总体上变化趋势一致。反应中,染料分子中的-SO3H、-C1基团均大部分生成了-So^2-4、CI,PO^3-4以游离的H2PO4存在于溶液中,氮则是根据基团的不同而部分被降解生成NO3。 相似文献
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从纤维结构及染色工艺对阳离子染料可染涤纶纤维的染色性能进行了研究。探讨了染料用量、pH值、匀染剂用量、和染色时间对染色的影响。通过对比试验得出最佳染色处方和工艺条件为:染料用量0.5%(o.w.f),pH值3.5—4.5,醋酸钠1%(o.w.f),匀染剂12270.5%(o.w.f),浴比1:30,100%染100分钟... 相似文献
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Andrzej Olszanowski Ewa Krzyzanowska Krzysztof Alejski 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1997,68(2):236-242
The kinetics of photo-isomerization and photo-degradation of 2-hydroxy-5-methylbenzophenone (E)- and (Z)-oximes in ethanol, octane, toluene and a mixture of octane and toluene under exposure to UV light was studied. The products of the photo-isomerization/photo-degradation of both oximes are similar but the conversion rate and amount of photo-degradation products of 2-hydroxy-5-methylbenzophenone (Z)-oxime are much higher. Also the photo-degradation of the (Z)-isomer is quicker than its photo-isomerization to the (E)-isomer. The photo-isomerization and photo-degradation kinetic models were developed for both oximes. The formulated kinetic model contains 12 reaction rate constants which have been estimated from experimental data. Good agreement was found between experimental and predicted data. © 1997 SCI. 相似文献
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聚氨酯丙烯酸酯齐聚物的合成及其反应动力学 总被引:3,自引:0,他引:3
以异佛尔酮二异氟酸酯、丙烯酸羟丙酯和聚乙二醇为原料。采用本体法两步合成聚氨酯丙烯酸酯齐聚物,经光热引发交联成型后可用作聚氨酯弹性体。通过温度、原料、催化剂类型及其用量对反应速率常数影响的实验,研究结果表明;齐聚物的合成是二级反应;温度对反应速率常数影响大;不同反应物的反应速率常数明是不同。由于催化机理的不同。有机锡和叔胺催化剂造成反应速率常数差异较大.并且发现使用三乙胺催化时,催化剂用量对反应速率常数影响明显。 相似文献
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Zhengzhou Wang Chuanmei Jiao Yuan Hu 《Polymer-Plastics Technology and Engineering》2013,52(8):771-778
The thermal degradation of flame-retarded ethylene-vinyl acetate copolymer (EVA) composites containing hydrotalcite (LDH) and red phosphorus (RP) are studied by thermogravimetric analysis. Four kinetics analysis models, i.e., the Kissinger method, the Flynn-Wall method, the Friedman method, and the Kissinger-Akahira-Sunose (KAS) method, are used to study the thermal degradation kinetics of the EVA/LDH composites. The apparent activation energy (E a ) data calculated from the four methods are compared. The E a results indicate that the addition of LDH and RP affects mainly the first thermal degradation stage of EVA. 相似文献
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对硝基苯酚臭氧化反应动力学研究 总被引:6,自引:0,他引:6
在T=298K,pH=2.1~6,采用停流光谱仪研究了对硝基苯酚与臭氧在水溶液中的臭氧化反应动力学。实验结果表明,对硝基苯酚臭氧化总的反应是2级,对臭氧浓度和对硝基苯酚浓度分别为1级。臭氧化反应速率常数随溶液pH值的增大而增大;T=298K时,当pH值从2.1变化到6,总的反应速率常数从5.88×104L(mol·s)-1增大到1.56×106L(mol·s)-1。为了验证其适用性,对臭氧在搅拌釜中在对硝基苯酚溶液中的吸收过程进行了模拟。采用MATLAB软件求解臭氧在搅拌釜中在对硝基苯酚溶液中吸收过程的质量平衡方程,模拟得到了吸收过程中臭氧和对硝基苯酚浓度的变化,并与实验值进行了比较。结果表明,在85%的对硝基苯酚降解之前,模拟值和实验值能很好地一致。在反应末期,模拟值和实验值出现了一定的偏差。 相似文献
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A procedure for the determination of initial parameter values for quadratically convergent optimization methods is proposed using artificial neural networks coupled with a non-stationary gas-liquid reaction model. The evaluation of the regression and the mean squared error coefficients of the neural network during its training process allow the parameter sensitivity analysis of the gas-liquid model. This analysis examines how many and which parameters of the model will be available depending on the observable information of the mathematical model. Numerical simulations show the relevance of the initial values and the non-linearity of the objective function. The methodology has been applied to the study of the reaction of the azo-dye Acid Red 27 with ozone in acid media. The rate constant is in the order of (1.6 ± 0.1) 103 M?1 s?1 under the experimental conditions. 相似文献