Jiang Liang, Chen Xiaojiang, Liao Jun, Wang Lielin, Zhang Yuxin, Yang Sha, Wang Qiuyi, Tang Yaoyao, Ding Congcong
Caea Innovation Center of Nuclear Environmental Safety Technology, Southwest University of Science and Technology, Mianyang 621010, China.
Chengdu Neusoft University, Chengdu 611800, China.
Sci Total Environ. 2025 Aug 18;998:180279. doi: 10.1016/j.scitotenv.2025.180279.
Rapid and efficient removal of radioactive iodine from nuclear accidents and effluent waste was significantly essential to protect the living environment and maintain human health. The nano-zero-valent copper modified activated carbon fiber (Cu@ACF) composite was successfully synthesized via an in situ self-reduction method. The structural and chemical compositions of both pristine and iodine-adsorbed samples (ACF and Cu@ACF) were systematically analyzed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The coexistence of carbon and copper was verified using energy dispersive spectroscopy (EDS). The effects of modifier concentration, contact time, pH value and interfering ions on the removal of I and I were comprehensively investigated through batch experiments. The adsorption capacity of 4 wt% Cu@ACF for I reached 980 mg/g (C = 1000 mg/L, pH = 2), and for I was 358 mg/g (C = 400 mg/L, pH = 2), significantly outperforming other reported iodine adsorbents. The kinetic studies revealed that the adsorption processes followed pseudo-second-order kinetics, while isotherm data were best described by the Langmuir model (R > 0.99), indicating monolayer chemisorption. The adsorption mechanism was dominated by chemical reactions where in iodide ions (I) interact with the metallic nano‑copper (Cu) anchored on the ACF surface, resulting in the formation of CuI characterized by polar covalent bonding. In a word, Cu@ACF showed an outstanding potential for radioactive wastewater treatment applications and this work presents a facile strategy for developing high-performance ACF-based adsorbents.
快速有效地去除核事故和废水废物中的放射性碘对于保护生活环境和维护人类健康至关重要。通过原位自还原法成功合成了纳米零价铜改性活性炭纤维（Cu@ACF）复合材料。采用X射线衍射（XRD）和X射线光电子能谱（XPS）对原始样品和碘吸附样品（ACF和Cu@ACF）的结构和化学成分进行了系统分析。利用能量色散光谱（EDS）验证了碳和铜的共存。通过批量实验全面研究了改性剂浓度、接触时间、pH值和干扰离子对碘和碘去除的影响。4 wt% Cu@ACF对碘的吸附容量在C = 1000 mg/L、pH = 2时达到980 mg/g，对碘的吸附容量在C = 400 mg/L、pH = 2时为358 mg/g，显著优于其他报道的碘吸附剂。动力学研究表明，吸附过程遵循准二级动力学，而等温线数据最好用Langmuir模型描述（R > 0.99），表明为单层化学吸附。吸附机制以化学反应为主，其中碘离子（I）与锚定在ACF表面的金属纳米铜（Cu）相互作用，导致形成以极性共价键为特征的CuI。总之，Cu@ACF在放射性废水处理应用中显示出巨大潜力，这项工作为开发高性能ACF基吸附剂提供了一种简便策略。
