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通过多壁碳纳米管吸附从废水中去除铀-238、钍-232和钾-40

Removal of Uranium-238, Thorium-232, and Potassium-40 from Wastewater via Adsorption on Multiwalled Carbon Nanotubes.

作者信息

Hassan Saad S M, Abdel Rahman Ehab M, El-Subruiti Gehan M, Kamel Ayman H, Diab Hanan M

机构信息

Chemistry Department, Faculty of Science, Ain Shams University, 11566 Cairo, Egypt.

Central Laboratory for Environmental Radioactivity Measurements Inter-Comparison and Training (CLERMIT), Nuclear and Radiological Regulatory Authority, 11762 Cairo, Egypt.

出版信息

ACS Omega. 2022 Apr 1;7(14):12342-12353. doi: 10.1021/acsomega.2c00819. eCollection 2022 Apr 12.

DOI:10.1021/acsomega.2c00819
PMID:35449914
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9016888/
Abstract

The optimum conditions for the removal of uranium-238, thorium-232, and potassium-40 from wastewater and the discharge of nuclear facilities using multiwalled carbon nanotubes (CNTs) are described. The adsorption mechanism is mainly attributed to chemical interactions between the metal ions and surface functional groups of the CNTs. Batch adsorption experiments are carried out in order to study the effect of different parameters such as pH, contact time, initial metal ion concentration, adsorbent dose, and temperatures. Maximum metal removal (>98%) from solutions containing 20-120 Bq/L metal ions is achieved using a contact time of 15 min, a pH of 6.0, and 10 mg/L CNTs. The effect of temperature on the kinetics and equilibrium of adsorption on CNT particles is examined. Consistent with an exothermic reaction, an increase in the temperature resulted in an increase in the adsorption rate. Langmuir, Freundlich, and Dubinin-Radushkevich isotherms are applied to the data obtained at various temperatures. The Langmuir adsorption model is the best for data interpretations. The kinetics of adsorption reveals a pseudo-second-order mechanism. Thermodynamic parameters at 293 K (Δ°, Δ°, and Δ°) for U-238, Th-232, and K-40 are -14590.7 kJ/mol, -6.66 kJ/mol, and 26.47 J/(mol K), -96,96.5 kJ/mol, -2.48 kJ/mol, and 14.17 J/(mol K), and -3922.09 kJ/mol, -1.32 kJ/mol, and 6.12 J/(mol K), respectively.

摘要

描述了使用多壁碳纳米管（CNT）从废水和核设施排放物中去除铀-238、钍-232和钾-40的最佳条件。吸附机制主要归因于金属离子与碳纳米管表面官能团之间的化学相互作用。进行了批量吸附实验，以研究不同参数（如pH值、接触时间、初始金属离子浓度、吸附剂剂量和温度）的影响。使用15分钟的接触时间、6.0的pH值和10mg/L的碳纳米管，可从含有20-120Bq/L金属离子的溶液中实现最大金属去除率（>98%）。研究了温度对碳纳米管颗粒吸附动力学和平衡的影响。与放热反应一致，温度升高导致吸附速率增加。将朗缪尔、弗伦德利希和杜宾宁-拉杜舍维奇等温线应用于在不同温度下获得的数据。朗缪尔吸附模型最适合数据解释。吸附动力学揭示了准二级机制。U-238、Th-232和K-40在293K时的热力学参数（Δ°、Δ°和Δ°）分别为-14590.7kJ/mol、-6.66kJ/mol和26.47J/(mol·K)，-9696.5kJ/mol、-2.48kJ/mol和14.17J/(mol·K)，以及-3922.09kJ/mol、-1.32kJ/mol和6.12J/(mol·K)。

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