膨胀石墨对染料和聚乙二醇的竞争吸附性能研究汇总.pdfVIP

摘 要 在 EG 的不同结构位点上；(4) 吸附过程是自发进行的；增大溶液的温度，离子强度和 吸附剂比表面积均使EG 对MO 和FB 的吸附量升高；(5) EG 上的单组份吸附和双组份 竞争吸附过程均可以用准二级模型来描述，吸附速率常数随吸附过程温度的升高而增 大；吸附作用以物理吸附为主。 在双组份竞争吸附中，虽然共存溶质的存在会降低 EG 对吸附质的吸附量，但由于 这些溶质会分别吸附在不同的位点上，使 EG 的总吸附性能增加，提高了吸附剂表面的 利用率。 关键词 膨胀石墨 聚乙二醇 染料 竞争吸附 吸附动力学 吸附热力学 II Abstract Abstract Expanded graphite EG is a type of new carbon adsorption material with loose porous structure. The graphite intercalation compound with some atomes and radicles is prepared through electrochemical oxidation methods or chemical oxidation methods using natural leprose graphite as raw materials. EG is obtained through the instant expand of the graphite intercalation compound. EG were prepared with H SO as inserting reagent and KMnO as oxidizing agent. 2 4 4 Adsorbates ’ (Poly ethylene glycol (PEG) and two kinds of dye) adsorption and competitive adsorption kinetics and thermodynamics on EG were investigated. The research showed adsorption, competitive adsorption capacities of two kinds of competition system (PEG with a molecular weight of 10000 and Acid brilliant red 3B (ABR, M=675) with azo-structure, PEG with a molecular weight of 10000 and Auramine lake yellow O (ALYO, M=318) with diphenyl methane structure) on expanded graphite (EG) .The results are: (1) EG has adsorption capacity for ABR, PEG and ALYO. In the adsorption and competitive adsorption of coexistence systems on EG, the adsorption isotherms are all type I. (2) In the competitive adsorption of dual component system, whether ABR a