Zhang Chunyang, Zhang Le, Zheng Bowen, Chu Haoran, Liu Zhaofeng, Bai Yun, Chang Sicheng, Yang Song, Zhao Ning, Yang Qingshan, Ma Yuheng
Department of Radioactive Waste Management, China Institute for Radiation Protection ,Taiyuan 030006, Shanxi, P.R. China.
Shanxi Provincial Engineering Research Center of Nuclear Facilities Decommissioning and Radioactive Waste Management,Taiyuan 030006, Shanxi, P.R. China.
ACS Omega. 2025 Mar 5;10(10):10251-10260. doi: 10.1021/acsomega.4c09661. eCollection 2025 Mar 18.
To promote the capacity of adsorbing radioactive iodine (I) in acid and alkaline situations, a high-removal-efficiency adsorbent based on silver oxide (AgO) and magnesium hydroxide (Mg(OH)) was synthesized by the in situ method. To determine the mechanism of this novel absorbent, batch experiments related to the temperature, pH, competitive ion (Cl), and kinetic analysis were carried out. The results showed that the AgO-Mg(OH) plate composites had high adsorption capacity and efficiency for I (409 mg/g, 25 °C) with a wide range of pH values (3-9). In addition, the adsorption time from the initial concentration to I removal (97.36%) was only 20 min. Competitive ion experiments depicted that Cl influenced the capacity of adsorbing I. The value of the pseudo-second-order model and regression factor were 7.86 × 10g mg min and 0.999 at 25 °C, respectively. The kinetics and XPS results proved that the mechanism of adsorption was chemical adsorption. Compared with other commercial adsorbents, the AgO-Mg(OH) plate composites had potential for application in nuclear wastewater treatment with low cost and high efficiency.
为提高在酸性和碱性条件下对放射性碘（I）的吸附能力，采用原位法合成了一种基于氧化银（AgO）和氢氧化镁（Mg(OH)₂）的高去除效率吸附剂。为确定这种新型吸附剂的作用机制，进行了与温度、pH值、竞争离子（Cl⁻）相关的批量实验以及动力学分析。结果表明，AgO-Mg(OH)₂平板复合材料对I具有高吸附容量和效率（409 mg/g，25℃），且pH值范围较宽（3 - 9）。此外，从初始浓度到I去除（97.36%）的吸附时间仅为20分钟。竞争离子实验表明，Cl⁻会影响对I的吸附能力。在25℃时，准二级模型的值和回归因子分别为7.86×10⁻³ g mg⁻¹ min和0.999。动力学和XPS结果证明吸附机制为化学吸附。与其他商业吸附剂相比，AgO-Mg(OH)₂平板复合材料在低成本高效处理核废水方面具有应用潜力。
