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通过磷酸改性处理活性炭,考察改性前后活性炭对亚甲基蓝吸附量的变化。关于活性炭对亚甲基蓝吸附行为的描述采用Langmuir和Freundlich吸附等温线模型。进一步研究了活性炭对亚甲基蓝的吸附动力学性质。试验改变因素包括吸附时间、吸附温度、亚甲基蓝溶液体积和活性炭投加量,探究这些因素对亚甲基蓝去除的影响。结果表明:质量分数为60%磷酸改性活性炭在吸附时间30 min、亚甲基蓝溶液体积40 mL、活性炭投加量0. 4 g、温度70℃时对亚甲基蓝的清除率最好。Langmuir等温模型能更好地拟合试验结果。活性炭吸附亚甲基蓝的动力学曲线更符合准二级动力学模型。研究表明磷酸改性的秸秆基活性炭对亚甲基蓝具有较好的吸附效果。 相似文献
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为提高化学(师范)专业学生的综合实验能力,设计了"活性炭吸附亚甲基蓝"物理化学综合实验.以活性炭为吸附剂,亚甲基蓝( MB) 为吸附质,考察了吸附剂用量、吸附时间、 温度对活性炭去除亚甲基蓝的影响.探讨了水溶液中活性炭固体颗粒吸附阳离子有机染料亚甲基蓝的吸附热力学(吸附等温线类型)、吸附动力学方程和盐酸脱附条件.结果表明,活性炭对亚甲基蓝染料的热力学吸附行为符合 Langmuir 等温吸附方程,其动力学吸附行为符合准一级动力学方程.选择1:1浓盐酸未能有效的将吸附的亚甲基蓝脱附. 相似文献
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为了探索磁性木质素基活性炭对亚甲基蓝的吸附性能和机制,采用化学共沉淀法制备木质素基磁性活性炭,考察了该磁性活性炭对亚甲基蓝的吸附性能。结果表明:该活性炭吸附亚甲基蓝的过程符合Langmuir吸附等温模型,吸附动力学符合用Elovich模型。磁性木质素基活性炭吸附亚甲基蓝是化学吸附为主的单分子层吸热过程。 相似文献
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活性炭纤维对水中亚甲基蓝的吸附脱色研究 总被引:3,自引:2,他引:3
研究了活性炭纤维(ACF)对水中亚甲基蓝的吸附脱色试验,温度为15-20℃,滤速为4mL/min时,浓度为10mg/L的亚甲基蓝脱色率达98%以上。活性炭纤维经20次吸附与解吸实验,吸附脱色性能没有明显降低。与颗粒状活性炭(GAC)相比,活性炭纤维吸附脱色亚甲基蓝的速度快,在短时间内,就能达到吸附平衡。 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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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献