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改性热解炭的表征及对水体中污染物的吸附研究

发布时间:2018-03-16 18:35

  本文选题:热解炭 切入点:硝酸 出处:《郑州大学》2015年硕士论文 论文类型:学位论文


【摘要】:本文在查阅国内外有关文献的基础上,以热解废弃物锯末热解炭(Py C)为原料,分别用硝酸和二乙烯三胺对其改性,制得改性炭MC1和MC2。采用等电点滴定、官能团的测定、元素分析、红外光谱(IR)、扫描电镜(SEM)和比表面积测定等分析方法对Py C改性前后进行表征和分析,结果表明,硝酸氧化改变了Py C表面的酸性官能团的数量,二乙烯三胺也成功的嫁接到Py C的表面。本文研究了MC1对亚甲基蓝(MB)和Pb2+、MC2对刚果红(CR)和2,4-二氯苯氧乙酸(2,4-D)的静态吸附行为。主要考察了吸附时间、吸附剂用量、溶液初始p H值和盐浓度、初始浓度和温度等因素对吸附过程的影响,同时也考察了吸附饱和MB的炭(ASC)对阴离子染料CR的吸附效果和MB与Pb2+的竞争吸附。结果表明:p H=8.00和6.00时,MC1对MB和Pb2+吸附量达到最大,MC2吸附CR和2,4-D的最佳p H值为2.00;四个单组份体系的平衡吸附时间分别为:480min、100min、400min、180min;随着温度的升高,MB和CR的吸附量逐渐增大,对Pb2+和2,4-D的吸附量影响不大;溶液中存在的可溶性盐在不同程度上对吸附产生了一定的影响;混合体系中,MB和Pb2+之间存在竞争吸附作用,互相对两者的吸附产生影响,但不影响两者的平衡时间;ASC对CR吸附,在碱性条件下吸附效果较好,升温不利于吸附的进行,可溶性盐存在有利于吸附。热力学参数表明各体系的吸附反应均能够自发进行。等温吸附模型中,Koble-Corrigan模型和Redich-Peterson模型可以描述每个体系,Temkin模型适合描述MC1-MB、MC1-Pb2+、MC2-(2,4-D)三个体系的吸附过程,Langmuir模型可以描述MC1-Pb2+、MC2-CR体系,Freund Lich模型可以对MC2-(2,4-D)体系进行较好的描述。动力学方程拟合参数表明准二级模型、Elovich模型和双常数模型适合描述MC1-MB、MC2-CR、MC2-(2,4-D)三个体系的吸附过程,而MC1-Pb2+适合用准二级模型、Elovich模型进行描述。研究结果为热解炭的进一步应用提供理论基础。
[Abstract]:In this paper, the modified carbon MC1 and MC2 were prepared from pyrolytic waste sawdust pyrolytic carbon Py C by using nitric acid and diethylenetriamine respectively. The modified carbon MC1 and MC2 were prepared by isoelectric point titration and the determination of functional groups. Elemental analysis, infrared spectroscopy (IR), scanning electron microscopy (SEM) and specific surface area measurement were used to characterize and analyze Py C before and after modification. The results showed that nitric acid oxidation changed the number of acidic functional groups on Py C surface. Diethylenetriamine was also successfully grafted onto the surface of Py C. the static adsorption behavior of MC1 for methylene blue (MBM) and Pb2 / MC2 for Congo red crimson (CR2) and 2C4- dichlorophenoxyacetate 24-D) was studied. The adsorption time and the amount of adsorbent were investigated. The effects of solution initial pH and salt concentration, initial concentration and temperature on the adsorption process, At the same time, the adsorption effect of anion dye CR and the competitive adsorption of MB with Pb2 were also investigated. The results showed that the adsorption capacity of MB and Pb2 reached the maximum pH of CR and 24-D adsorbed by MC-2 at 8. 00 and 6. 00, respectively. The equilibrium adsorption time of the four mono-component systems was: 480min, 100min, 400min, 180min, respectively, and the adsorption amounts of MB and CR increased with the increase of temperature. It has little effect on the adsorption capacity of Pb2 and 2n4-D, the soluble salt in solution has a certain influence on the adsorption to some extent, and there is a competitive adsorption between MB and Pb2 in the mixed system, which affects each other's adsorption. However, the adsorption of CR was not affected by the equilibrium time of ASC, and the adsorption effect was better in alkaline condition, and the temperature rise was not conducive to the adsorption of CR. The existence of soluble salt is beneficial to adsorption. Thermodynamic parameters show that the adsorption reaction of each system can proceed spontaneously. Koble-Corrigan model and Redich-Peterson model in isothermal adsorption model can describe each system. Temkin model is suitable for describing three systems of MC1-MBN MC1-Pb2 and MC2-Pb2 MC-24-D. The adsorption process can be described by the Langmuir model. The Freund Lich model of MC1-Pb2 / MC-2-CR system can be used to describe the adsorption process of MC2-C _ 2-CR system. The kinetic equation fitting parameters indicate that the quasi-second-order model Elovich model and the double-constant model are suitable for describing the adsorption process of MC1-MBN / MC2-CRMC2-O4-D system. MC1-Pb2 is suitable to be described by the quasi-secondary model Elovich model, and the results provide a theoretical basis for the further application of pyrolytic carbon.
【学位授予单位】:郑州大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:X52

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