【作者】 王浩伊；

【导师】 曹贵平；

【作者基本信息】 华东理工大学 ， 化学工程， 2011， 硕士

【摘要】 论文首先采用均相Fenton试剂对丙二醇(PG)废水进行处理。H202和FeSO4采用滴加的方式加入反应器,分别考察H202与PG摩尔比、Fe2+与PG摩尔比、H202和FeSO4的滴加时间、温度、pH、滴加后的反应时间等因素对PG降解速率、PG去除率和COD去除率的影响。建立了拟一级动力学模型,计算得到Fenton反应条件下的拟一级动力学速率常数和本征反应速率常数。然后采用活性炭吸附法对不同浓度的PG废水进行处理。实验中用到的活性炭为MCC2004和MCC2005,分别考察温度、PG初始浓度、活性炭加入量三个因素对PG的吸附性能的影响,建立其动力学、热力学模型,并进行其吸附机理分析。选取不同的改性剂对活性炭进行改性处理。利用Beohm滴定法测定改性前后活性炭表面官能团的含量,采用N2物理吸附法测定改性前后活性炭的结构特性,考察改性前后活性炭对PG吸附性能的影响,并分析PG的性质、活性炭的结构特性、活性炭吸附能力三者之间的联系。最后利用Fe/C-Fenton试剂法对PG废水进行处理,H2O2采用滴加的方式加入到反应器中,分别考察Fe/C催化剂浓度、H202加入量、滴加时间、温度四个因素对PG处理效果的影响。更多还原

【Abstract】 In this paper, propylene glycol (PG) was treated by continuously adding two solutions of ferrous sulfate (FeSO4) and hydrogen peroxide (H2O2). The effect of different operational variables, such as the molar ratio of H2O2 to PG, the molar ratio of Fe2+ to PG, the dropping time of H2O2 and Fe2+, reaction time after dropping, temperature, and initial pH were investigated, respectively. In this study, HO·concentration was assumed to remain constant in the procedure and pseudo-first-order model was established which involved the concentration of Fe2+, H2O2 and PG. The apparent rate constant kap and the intrinsic reaction rate constant of HO·with PG under optimal conditions were calcaulated, respectively.Then the adsorption capacities of MCC2004 and MCC2005 for PG wastewater were evaluated, respectively. The effect of different operational variables, such as initial PG concentration, temperarure, and activated carbon concentration were investigated, respectively. The adsorption data were processed to study the adsorption isotherms, kinetics, thermodynamics, and mechanism of PG onto the MCC2004 and MCC2005, respectively.We investigated the influence of activated carbon modified by HNO3, H2O2, NaOH, and NH3·H2O on the adsorption of PG onto MCC2004 and MCC2005, respectively. The physical characteristics of original and modified carbons were determined by nitrogen adsorption isotherms, respectively. The Boehm Method was applied in order to estimate the content of surface functional groups. The relationship among the properties of PG, structural characteristics of activated carbon, and adsorption capacity were analyzed for PG adsorption.At last, PG wastewater was treated by heterogeneous Fenton reaction using 5%Fe/C catalyst. The effect of different operational variables, such as the molar ratio of H2O2 to PG, the concentration of Fe/C catalyst, the dropping time of H2O2, and temperature were investigated, respectively.更多还原