Zhang Lanyue, Wei Shuxian, Guo Zhiyun, Li Canhua, Yin Zhenxing, Li Jie, Li Jiamao
School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan, Anhui 243002, China.
Key Laboratory of Metallurgical Emission Reduction and Resource Recycling, Ministry of Education, Anhui University of Technology, Ma'anshan, Anhui 243002, China.
Langmuir. 2025 Jun 24;41(24):15654-15666. doi: 10.1021/acs.langmuir.5c01999. Epub 2025 Jun 11.
The escalating ecological threats posed by co-existing heavy metals and antibiotics necessitate innovative remediation strategies. Herein, a magnetic rod-like nano-cobalt/zero-valent iron composite (Co@nZVI) was synthesized via a dual-phase approach integrating the rheological phase reaction and liquid-phase reduction, demonstrating exceptional dual functionality for simultaneous Pb immobilization and tetracycline (TC) degradation. Comprehensive characterization of the materials confirmed the successful synthesis and structural properties of the materials. Batch experiments evaluated removal efficiency of TC and Pb under varying pH, temperature, and initial concentration conditions. Optimal removal (TC, 87.6%; Pb, 97.7%) was achieved at pH 7, 20 °C, and 1 g L dosage, reducing 20 mg L contaminants to trace levels within 120 min. Langmuir-type monolayer chemisorption and pseudo-second-order adsorption behavior were demonstrated by kinetic and isotherm studies, with maximal capacities of 22.43 mg g (TC) and 23.07 mg g (Pb). Thermodynamic analysis confirmed the spontaneity of the adsorption process. Mechanistically, the removal of Pb is governed by surface complexation, cation exchange, and electrostatic interactions, whereas the degradation of TC relies on the interaction with adsorbents via ion exchange and the presence of Co@nZVI nanomaterials activating HO to trigger a Fenton-like reaction, with OH acting as the main reactive oxygen species (ROS) for TC to be degraded. The material is not only environmentally friendly, cheap, and efficient but also shows great potential in the remediation of composite-contaminated sites.
共存的重金属和抗生素所带来的不断升级的生态威胁，使得创新的修复策略成为必要。在此，通过将流变相反应和液相还原相结合的双相方法合成了一种磁性棒状纳米钴/零价铁复合材料（Co@nZVI），该材料在同时固定铅和降解四环素（TC）方面展现出卓越的双重功能。对材料的全面表征证实了材料的成功合成及其结构特性。批次实验评估了在不同pH值、温度和初始浓度条件下TC和铅的去除效率。在pH值为7、温度为20°C且投加量为1 g/L时实现了最佳去除效果（TC为87.6%；铅为97.7%），在120分钟内将20 mg/L的污染物降至痕量水平。动力学和等温线研究表明其符合Langmuir型单层化学吸附和准二级吸附行为，最大吸附容量分别为22.43 mg/g（TC）和23.07 mg/g（铅）。热力学分析证实了吸附过程的自发性。从机理上讲，铅的去除受表面络合、阳离子交换和静电相互作用控制，而TC的降解则依赖于通过离子交换与吸附剂的相互作用以及Co@nZVI纳米材料激活HO引发类芬顿反应，其中OH作为主要的活性氧物种（ROS）用于降解TC。该材料不仅环保、廉价且高效，而且在复合污染场地的修复中显示出巨大潜力。
