Separation of 125Sb and 60Co from liquid radioactive waste by activated carbon: isotherm and kinetics studies

IF 1.5 3区化学 Q3 CHEMISTRY, ANALYTICAL

Journal of Radioanalytical and Nuclear Chemistry Pub Date : 2025-02-10 DOI:10.1007/s10967-025-09999-9

Waqar Un Nisa Khadim, Mumtaz Khan, Lubna Ghani, Niu Jie

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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.

Graphical Abstract

Abstract Image

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用活性炭分离放射性废液中的125Sb和60Co：等温线和动力学研究

本研究的目的是利用分析级活性炭（AGAC）作为吸附剂，从研究堆冷却剂废物中去除低放射性液体废物中的125Sb和60Co。AGAC是一种高多孔吸附剂，用于去除水中的金属/污染物。利用SEM、EDX和FT-IR对AGAC进行了表征。实验研究包括零电荷点、固定床和批量研究。在固定床研究中，确定了不同床高和流量下的突破曲线，以优化吸附剂的吸附能力。在特定条件下，AGAC循环ⅲ的突破量最高，为125Sb的964.28 Bq/g， 60Co的2530 Bq/g。发现Thomas模型最适合固定床的研究结果。在批量研究中，采用等温线和动力学模型对接触时间、吸附剂剂量、pH、温度和初始活性等参数进行了优化。根据得到的R2值，AGAC吸附125Sb和60Co的最佳模型分别为Freundlich等温线模型和伪二级动力学模型。图形抽象

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来源期刊

Journal of Radioanalytical and Nuclear Chemistry 化学-分析化学

CiteScore

2.80

自引率

18.80%

发文量

504

审稿时长

2.2 months

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.