表面活性剂对芳香族化合物的吸附影响研究

发布时间：2018-07-02 21:38

本文选题：吸附树脂 + 表面活性剂　；参考：《安徽工业大学》2015年硕士论文

【摘要】：本文采用NDA-150和XAD-4两种树脂作为吸附剂,以芳香族化合物(萘、苯胺)、表面活性剂(聚乙二醇-6000、直链十二烷基苯磺酸钠)作为研究对象。分别研究了在不同初始条件(初始投加量、反应时间、温度)影响下单组份污染物在树脂上的吸附行为,并以此为基础研究了双组份共存污染物的情况下芳香族化合物以及表面活性剂在树脂上的吸附行为,探讨了复合污染情况下的吸附规律及各污染物之间的互相影响。本文的研究结论如下:(1)NDA-150树脂对PEG、萘及LAS的单组份吸附过程均可用Freundlich吸附等温式很好的拟合,对苯胺的吸附过程可用Langmuir吸附等温式很好的拟合。XAD-4树脂对PEG、苯胺及LAS的吸附可用Langmuir吸附等温式很好的拟合,对萘的吸附可用Freundlich吸附等温式很好的拟合,而对萘的吸附两种吸附等温式均可以很好的拟合。(2)吸附热力学及吸附动力学研究表明,三种物质在两种树脂上吸附为自发进行的放热过程,且吸附朝着有序的方向进行。在NDA-150树脂上的吸附速率比在XAD-4树脂上的吸附速率慢。但在NDA-150树脂上的平衡吸附量要高于污染物在XAD-4树脂上的平衡吸附量。拟二级动力学方程可以很好的模拟三种物质在树脂上的吸附过程。(3)双组份吸附过程中,NDA-150树脂对萘的吸附过程及XAD-4树脂对萘及苯胺的吸附过程均符合Freundlich方程,NDA-150树脂对苯胺的吸附过程符合Langmuir方程。且两种树脂对萘及苯胺的吸附均属于优惠吸附过程。(4)对于PEG-苯胺共存体系在树脂上的吸附研究发现,PEG的存在有利于两种树脂对苯胺的吸附。对于PEG-萘共存体系在树脂上的吸附研究发现,PEG的存在不利于两种树脂对萘的吸附。(5)对双组份的吸附热力学研究表明,萘及苯胺在两种树脂上的吸附焓变?H均小于0,说明树脂对双组份的吸附过程为放热过程。?G的值均小于0,说明反应可以自发进行,?S的值也是小于0的,说明反应朝着有序的方向进行。
[Abstract]:In this paper, two resins of NDA-150 and XAD-4 were used as adsorbents, aromatic compounds (naphthalene, aniline) and surface active agents (polyethylene glycol -6000, direct chain twelve alkylbenzene sulfonate) were used as the research objects. The adsorption of single component pollutants on the resin under the influence of different initial conditions (initial dosage, reaction time and temperature) was studied. On the basis of this, the adsorption behavior of aromatic compounds and surface active agents on the resin under the condition of two components coexisting pollutants was studied. The adsorption law and the interaction between the pollutants were discussed. The conclusions of this paper are as follows: (1) the adsorption of PEG, naphthalene and LAS by NDA-150 resin The process can be fitted well with Freundlich adsorption isotherm. The adsorption process of aniline can be well fitted with Langmuir adsorption isothermal formula for the adsorption of.XAD-4 resin to PEG, aniline and LAS, which can be fitted well by Langmuir adsorption isothermal equation. The adsorption of naphthalene can be fitted well with Freundlich adsorption isothermal equation and two kinds of adsorption for naphthalene adsorption. The isothermal equation can all be well fitted. (2) the adsorption thermodynamics and adsorption kinetics studies show that the adsorption of three substances on the two resins is spontaneous exothermic process, and the adsorption is in the direction of order. The adsorption rate on the NDA-150 resin is slower than that on the XAD-4 resin. But the equilibrium adsorption on the NDA-150 resin is balanced. The amount of the equilibrium adsorption on the XAD-4 resin is higher than that of the pollutants. The quasi two order kinetic equation can well simulate the adsorption process of three substances on the resin. (3) the adsorption process of NDA-150 resin for naphthalene and the adsorption process of XAD-4 resin for naphthalene and aniline in the process of double component adsorption are all in accordance with the Freundlich equation, and the NDA-150 resin is on the aniline. The adsorption process conforms to the Langmuir equation. And the adsorption of two resins on naphthalene and aniline all belong to the preferential adsorption process. (4) the adsorption of PEG- aniline coexistence system on the resin found that the existence of PEG was beneficial to the adsorption of two resins to aniline. The study on the adsorption of PEG- naphthalene on the tree fat found that the existence of PEG was not favorable. The adsorption of naphthalene by two kinds of resin. (5) the adsorption thermodynamics of two components showed that the adsorption enthalpy of naphthalene and aniline on two kinds of resin was less than 0, which indicated that the adsorption process of the resin to the double components was exothermic process. The value of G was less than 0, indicating that the reaction could be carried out spontaneously, and the value of S was less than 0, indicating that the reaction was directed toward order direction. That's ok.
【学位授予单位】：安徽工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703;O647.3

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