Waqar Un Nisa Khadim, Mumtaz Khan, Lubna Ghani, Niu Jie
{"title":"Separation of 125Sb and 60Co from liquid radioactive waste by activated carbon: isotherm and kinetics studies","authors":"Waqar Un Nisa Khadim, Mumtaz Khan, Lubna Ghani, Niu Jie","doi":"10.1007/s10967-025-09999-9","DOIUrl":null,"url":null,"abstract":"<div><p>The aim of this study is to remove <sup>125</sup>Sb and <sup>60</sup>Co from low-level liquid radioactive waste using Analytical Grade Activated Carbon (AGAC) as an adsorbent from a research reactor coolant waste. AGAC is a highly porous adsorbent used to remove metals/pollutants from water. The AGAC was characterized using SEM, EDX, and FT-IR. Experimental studies included Point of Zero Charge, fixed bed, and batch studies. In the fixed bed study, breakthrough curves were determined for different bed heights and flow rates to optimize the sorption capacity of the adsorbent. Cycle III of AGAC showed the highest breakthrough capacity at 964.28 Bq/g for <sup>125</sup>Sb and 2530 Bq/g for <sup>60</sup>Co with specific conditions. The Thomas model was found to be the best fit for the fixed bed study results. In the batch study, various parameters such as contact duration, adsorbent dose, pH, temperature, and initial activity were optimized using isotherm and kinetic models. The Freundlich Isotherm Model and Pseudo 2nd Order kinetic model were the best fits for <sup>125</sup>Sb and <sup>60</sup>Co adsorption with AGAC, respectively, based on the R<sup>2</sup> values obtained.</p><h3>Graphical Abstract</h3>\n<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":661,"journal":{"name":"Journal of Radioanalytical and Nuclear Chemistry","volume":"334 3","pages":"1967 - 1985"},"PeriodicalIF":1.5000,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Radioanalytical and Nuclear Chemistry","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1007/s10967-025-09999-9","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
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Abstract
The aim of this study is to remove 125Sb and 60Co from low-level liquid radioactive waste using Analytical Grade Activated Carbon (AGAC) as an adsorbent from a research reactor coolant waste. AGAC is a highly porous adsorbent used to remove metals/pollutants from water. The AGAC was characterized using SEM, EDX, and FT-IR. Experimental studies included Point of Zero Charge, fixed bed, and batch studies. In the fixed bed study, breakthrough curves were determined for different bed heights and flow rates to optimize the sorption capacity of the adsorbent. Cycle III of AGAC showed the highest breakthrough capacity at 964.28 Bq/g for 125Sb and 2530 Bq/g for 60Co with specific conditions. The Thomas model was found to be the best fit for the fixed bed study results. In the batch study, various parameters such as contact duration, adsorbent dose, pH, temperature, and initial activity were optimized using isotherm and kinetic models. The Freundlich Isotherm Model and Pseudo 2nd Order kinetic model were the best fits for 125Sb and 60Co adsorption with AGAC, respectively, based on the R2 values obtained.
期刊介绍：
An international periodical publishing original papers, letters, review papers and short communications on nuclear chemistry. The subjects covered include: Nuclear chemistry, Radiochemistry, Radiation chemistry, Radiobiological chemistry, Environmental radiochemistry, Production and control of radioisotopes and labelled compounds, Nuclear power plant chemistry, Nuclear fuel chemistry, Radioanalytical chemistry, Radiation detection and measurement, Nuclear instrumentation and automation, etc.
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