共查询到20条相似文献,搜索用时 78 毫秒
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以天然沸石为载体制备TiO2/天然沸石光催化剂,考察SO4^2- 、HCO3^- 和Cl^-对负载型TiO2光催化去除氨氮的影响。结果表明SO4^2- 、HCO3^-对光催化反应均有抑制作用,当溶液中SO4^2-浓度达到5.0mmol/L时,光催化反应速率由0.001793min^-1下降到0.000649min^-1,氨氮去除率下降了27%,当溶液中HCO3^-浓度达到5.0mmol/L时,光催化反应速率由0.001796min。下降到0.000562min^-1,氨氮去除率下降了32%,Cl^-浓度在0—50mmol/L范围内对光催化反应影响不明显。 相似文献
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悬浮型光催化纳滤膜反应器处理H酸废水光催化降解效率及反应动力学 总被引:1,自引:0,他引:1
分别采用悬浮型光催化反应器和悬浮型光催化纳滤膜反应器进行光催化降解H酸溶液试验。结果表明,后者比前者具有更好的光催化处理效果。在污染物初始质量浓度分别为50mg/L、100mg/L和150mg/L、p/p0≥0.7的反应条件下,悬浮型光催化反应器中污染物光催化降解过程分别遵循L-H-级、一级以及一级与0级耦合的反应动力学。而在悬浮型光催化纳滤膜反应器的耦合工艺中,光催化降解过程分别遵循L-H一级、一级与0级的耦合以及0级反应动力学模型。 相似文献
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以分散态纳米TiO2为光催化剂,在鼓泡流化床光催化反应器中对活性翠兰K-GL染料溶液进行光催化降解实验研究。通过改变光催化剂投入量、染料溶液的初始浓度和Na2SO4与NaCl的掺加,探讨了影响光催化降解K-GL的因素,运用Langrmuir-Hinshelwood动力学方程对染料降解动力学规律进行了研究。结果表明,TiO2光催化降解活性翠兰K-GL的反应遵循准一级反应动力学方程,且表观反应速率表常数随活性翠兰溶液初始浓度的升高而降低;反应的催化剂最佳投入量为0.122g/L;光催化体系中的Na2SO4对于染料K-GL的降解表现出明显的促进作用,在较低浓度下,Na2SO4的最佳添加量为0.104mol/g,且随着其浓度的升高,表观反应速率常数随之增大;而掺加不同浓度的NaCl对光催化降解K-GL有抑止作用。 相似文献
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采用溶胶一凝胶法制备了负载于玻璃的CdO-TiO2复合光催化剂,并将其用于光催化降解染料酸性媒介红B。实验表明,n(Cd)/n(Ti)=0.04,涂覆5层,550℃煅烧0.5h的CdO-TiO2复合光催化剂活性最高,反应1h后的降解率是使用纯TiO2的3倍多。实验证明,该负载型光催化剂对染料酸性媒介红B的降解符合准一级动力学规律,常温(25℃)时反应的速率常数为0.0095min^-1,反应的活化能21.2KJ/mol。 相似文献
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采用序批式生物膜反应器(SBBR)处理经Fenton预处理后的偶氮染料活性嫩黄K-6G模拟染料废水。试验结果表明:该反应器的COD去除效果稳定,平均去除率达63%,且具有一定抗冲击负荷能力;好氧段COD降解过程服从扩散控制下的生物膜反应动力学模型:rA=1.69(S-55.2),其中包含扩散作用的膜表面反应速率常数k1A为1.69 m/d,生化反应速率常数k1Vf为47 867~95 733 d-1。 相似文献
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电解法降解刚果红染料废水的研究 总被引:1,自引:0,他引:1
应用自制电化学反应器对刚果红染料废水进行电解降解。研究了电解时间、废水pH值、电压、溶液初始浓度等对刚果红电解去除效果的影响,确定了最佳的降解条件:电压5V,电解质硫酸钠加入量15m∥L,电解时间4h。刚果红降解率达到74.1%。 相似文献
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以Y3+掺杂二氧化钛为光催化剂,以亚甲基蓝为模拟印染废水进行光催化降解实验,考察了催化剂用量、溶液初始pH值、溶液初始浓度、反应时问等因素对降解反应的影响,结果表明:当催化剂的用量为1。5g/L,亚甲基蓝洛液pH值为9.0、初始浓度为20mg/L,反应60rain后,其降解效果最佳。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
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塔设备改造选型的分析 总被引:2,自引:0,他引:2
就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后,着重介绍一种新型塔板(导向梯形浮阀塔板)和一种新型填料(波环填料——乾隆帕克)。 相似文献