共查询到15条相似文献,搜索用时 140 毫秒
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制备了SO42-、NO3-、ClO4-和F-、Cl-、Br-、I-两种新型阴离子苯乙烯-二乙烯苯聚合物微球,基于吸附质-分子探针电导法,研究了阴离子聚合物吸附低浓度游离酸的性能,考察了阴离子类型和温度对吸附行为的影响。实验结果表明,在30℃时,吸附游离酸的过程,遵循单分子层机理进行吸附。吸附剂-吸附质相互作用能U制约表观吸附速率常数K,两者存在线性相关性,K、U均随阴离子的离子势增大呈逐渐减小的趋势。吸附过程为吸热的,吸附焓变ΔH为10.87 kJ.mol-1。吸附过程谱维数ds增大,导致表观吸附速率常数降低。吸附质对吸附剂的亲和能Ua随吸附质-吸附剂相互作用参数K2增大而减小。 相似文献
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The adsorption of free acid of low concentration by crosslinked chitosan resin was followed by electrochemical experimental technique.The effect of acid concentration and the media on adsorption was discussed.The experimental results show that both the apparent rate constant and the interaction energy between the adsorbent and adsorbate are decreased while the concentration of hydrochloric acid is increased.In the adsorption system.the adsorption was effected by addiiton of organic solvent. 相似文献
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The adsorption of low concentration of free acid by regenerable chitin is followed by electric conductance determination.The effect of acid concentratioin,content of functioinal amino groups,and ionic strength on adsorption was discussed.Experimental results indicate that the active centre of regenerable chitin is the free amino groups on ist surface ,and that the rate of adsorption of free acid was found to be affected by two factors:the interaction between the adsorbent and the adsorbate in solution and that between the adsorbate molecules or ions in solution. 相似文献
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The absorption of free alkali at low concentration by subacid resin was traced with electric conductance method,the effect of temperature on the adsorption,the activation energy of adsorption (Ea) and interaction energy(U) was studied.The result showed that,the process of low concentration alkali adsorption by subacid resin was in accordance with mechanism of monomolecular layer absorption,in addition,with the increasing of temperature,the interaction energy between adsorbate and sorbent increase,so did the surface adsorption rate(k),and linear correlation existed between interaction energy(U) and temperature(T). 相似文献
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PAN Yufang CHEN Bingren . Guangdong College of Pharmacy Guangzhou . Department of Chemistry South China Normal University Guangzhou 《Chinese Journal of Reactive Polymers》2001,(1)
1. INTRODUCTIONIn the purification process of food, drug, and biological products, usually the material to be purified were not neutral. Application of traditional neutralization method with acid or alkali could increase electrolyte content in the material to be purified. Due to the capability of the adsorption of free alkali by subacid resin, the defect of electrolyte absorption in neutralization could be avoided when used in the purification of food, drug, and biological products [1]. H… 相似文献
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To explain the mechanism underlying the adsorption of stevia's polar component rebaudioside A in hydrophilic interaction liquid chromatography mode, the characteristics of rebaudioside A adsorption on various resins in an organic‐solvent‐rich system were studied. Among the tested resins, the strongly acidic cation resin FPC11 showed the best adsorption behavior for rebaudioside A. The factors affecting the adsorption kinetics of the resin for rebaudioside A are discussed. The results showed that the pseudo‐second‐order reaction model and intra‐particle diffusion model best described the adsorption kinetics of rebaudioside A on the resin. The adsorption rate was controlled by physical sorption, mainly via electron sharing or electron transfer between the adsorbent and the adsorbate. The adsorption process with multiple stages involved weak initial adsorption behavior. Thermodynamic studies showed that the adsorption of rebaudioside A on the resin was not an ideal monolayer adsorption, but mutual adsorption effects between the adsorbates. The adsorption was a spontaneous, entropy‐increasing endothermic process. The synergistic effect of hydrogen bonding and ion–dipole was a possible driving force. 相似文献