本文選題：熱解炭　切入點：硝酸　出處：《鄭州大學》2015年碩士論文　論文類型：學位論文

【摘要】：本文在查閱國內(nèi)外有關文獻的基礎上,以熱解廢棄物鋸末熱解炭(Py C)為原料,分別用硝酸和二乙烯三胺對其改性,制得改性炭MC1和MC2。采用等電點滴定、官能團的測定、元素分析、紅外光譜(IR)、掃描電鏡(SEM)和比表面積測定等分析方法對Py C改性前后進行表征和分析,結(jié)果表明,硝酸氧化改變了Py C表面的酸性官能團的數(shù)量,二乙烯三胺也成功的嫁接到Py C的表面。本文研究了MC1對亞甲基藍(MB)和Pb2+、MC2對剛果紅(CR)和2,4-二氯苯氧乙酸(2,4-D)的靜態(tài)吸附行為。主要考察了吸附時間、吸附劑用量、溶液初始p H值和鹽濃度、初始濃度和溫度等因素對吸附過程的影響,同時也考察了吸附飽和MB的炭(ASC)對陰離子染料CR的吸附效果和MB與Pb2+的競爭吸附。結(jié)果表明:p H=8.00和6.00時,MC1對MB和Pb2+吸附量達到最大,MC2吸附CR和2,4-D的最佳p H值為2.00;四個單組份體系的平衡吸附時間分別為:480min、100min、400min、180min;隨著溫度的升高,MB和CR的吸附量逐漸增大,對Pb2+和2,4-D的吸附量影響不大;溶液中存在的可溶性鹽在不同程度上對吸附產(chǎn)生了一定的影響;混合體系中,MB和Pb2+之間存在競爭吸附作用,互相對兩者的吸附產(chǎn)生影響,但不影響兩者的平衡時間;ASC對CR吸附,在堿性條件下吸附效果較好,升溫不利于吸附的進行,可溶性鹽存在有利于吸附。熱力學參數(shù)表明各體系的吸附反應均能夠自發(fā)進行。等溫吸附模型中,Koble-Corrigan模型和Redich-Peterson模型可以描述每個體系,Temkin模型適合描述MC1-MB、MC1-Pb2+、MC2-(2,4-D)三個體系的吸附過程,Langmuir模型可以描述MC1-Pb2+、MC2-CR體系,Freund Lich模型可以對MC2-(2,4-D)體系進行較好的描述。動力學方程擬合參數(shù)表明準二級模型、Elovich模型和雙常數(shù)模型適合描述MC1-MB、MC2-CR、MC2-(2,4-D)三個體系的吸附過程,而MC1-Pb2+適合用準二級模型、Elovich模型進行描述。研究結(jié)果為熱解炭的進一步應用提供理論基礎。
[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.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X52

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