Tkabo Tewelde Sahle, E. P. Markova, A. P. Glinushkin, A. G. Cherednichenko
{"title":"Changing the Surface Properties of Activated Carbons to Improve Acetonitrile Adsorption","authors":"Tkabo Tewelde Sahle, E. P. Markova, A. P. Glinushkin, A. G. Cherednichenko","doi":"10.3103/S0361521926600367","DOIUrl":null,"url":null,"abstract":"<p>The efficiency of adsorption of polar organic solvents by activated carbon is determined by the chemical and textural properties of its surface. Chemical modification of the surface of well-known industrial adsorbents is one of the ways to improve their technical characteristics. The surface of four industrial activated carbons (AG-3, KAU, BAU-A, and EcoSorb) was modified by treating them with a 2 M aqueous solution of nitric acid. The changes in the acidic properties of the adsorbent surface were quantified by UV spectroscopy using adsorption of pyridine from its solution in <i>n</i>-octane. The adsorption characteristics of the obtained materials were studied by the gravimetric method using the adsorption of acetonitrile vapor at a temperature of 25°C and atmospheric pressure as an example. The obtained results were compared with similar indicators for the initial unmodified activated carbons. The analysis showed that acid-modified adsorbents had higher rates of adsorption and equilibrium specific capacity for absorption of acetonitrile vapor than their original counterparts. The capacitance characteristics increased in the order mKAU < mBAU-A < mAG-3 < mEcoSorb, which mainly correlated with changes in the acidic surface properties of the modified carbon adsorbents. At the same time, the maximum increase in capacitance characteristics was shown by mEcoSorb and mKAU adsorbents, and the minimum increase was shown by mBAU-A. Kinetic modeling has shown that the process of acetonitrile vapor adsorption, as in the case of nonpolar volatile organic compounds (VOCs), was best described by a pseudo-second-order model. Therefore, due to specific interactions between adsorbate and adsorbent molecules, chemisorption was the rate-determining stage of the process under study. The results obtained emphasized the important role of surface functionalization of industrial activated carbons using chemical reagents to improve their adsorption characteristics.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"60 2","pages":"119 - 125"},"PeriodicalIF":0.8000,"publicationDate":"2026-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Solid Fuel Chemistry","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.3103/S0361521926600367","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The efficiency of adsorption of polar organic solvents by activated carbon is determined by the chemical and textural properties of its surface. Chemical modification of the surface of well-known industrial adsorbents is one of the ways to improve their technical characteristics. The surface of four industrial activated carbons (AG-3, KAU, BAU-A, and EcoSorb) was modified by treating them with a 2 M aqueous solution of nitric acid. The changes in the acidic properties of the adsorbent surface were quantified by UV spectroscopy using adsorption of pyridine from its solution in n-octane. The adsorption characteristics of the obtained materials were studied by the gravimetric method using the adsorption of acetonitrile vapor at a temperature of 25°C and atmospheric pressure as an example. The obtained results were compared with similar indicators for the initial unmodified activated carbons. The analysis showed that acid-modified adsorbents had higher rates of adsorption and equilibrium specific capacity for absorption of acetonitrile vapor than their original counterparts. The capacitance characteristics increased in the order mKAU < mBAU-A < mAG-3 < mEcoSorb, which mainly correlated with changes in the acidic surface properties of the modified carbon adsorbents. At the same time, the maximum increase in capacitance characteristics was shown by mEcoSorb and mKAU adsorbents, and the minimum increase was shown by mBAU-A. Kinetic modeling has shown that the process of acetonitrile vapor adsorption, as in the case of nonpolar volatile organic compounds (VOCs), was best described by a pseudo-second-order model. Therefore, due to specific interactions between adsorbate and adsorbent molecules, chemisorption was the rate-determining stage of the process under study. The results obtained emphasized the important role of surface functionalization of industrial activated carbons using chemical reagents to improve their adsorption characteristics.
期刊介绍：
The journal publishes theoretical and applied articles on the chemistry and physics of solid fuels and carbonaceous materials. It addresses the composition, structure, and properties of solid fuels. The aim of the published articles is to demonstrate how novel discoveries, developments, and theories may be used in improved analysis and design of new types of fuels, chemicals, and by-products. The journal is particularly concerned with technological aspects of various chemical conversion processes and includes papers related to geochemistry, petrology and systematization of fossil fuels, their beneficiation and preparation for processing, the processes themselves, and the ultimate recovery of the liquid or gaseous end products.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
