Chen Congcong, Zhu Bohong, Li Nuo, Dong Peizhe, Zhu Kun, Luo Weicheng
School of Materials Science and Engineering, Hunan University of Technology, Zhuzhou 417007, PR China.
School of Materials Science and Engineering, Hunan University of Technology, Zhuzhou 417007, PR China.
J Hazard Mater. 2025 Sep 5;495:139017. doi: 10.1016/j.jhazmat.2025.139017. Epub 2025 Jun 24.
Thallium (Tl) is a highly toxic pollutant to mammals, and its removal from industrial wastewater has emerged as a critical environmental challenge. Although sulfidized nanoscale zero-valent iron (S-nZVI) is widely regarded as an effective adsorbent for heavy metals, its effectiveness in removing Tl(I) from wastewater remains unclear. In this work, four S-nZVI samples were synthesized using different post-sulfidation methods, and their Tl(I) removal performances were evaluated and compared. The results showed that S@nZVI exhibited a significantly higher Tl(I) removal efficiency (98 % within 180 min) than other S-nZVI samples (9-15 %). Combining empirical model analyses (adsorption kinetics and isotherms), characterizations (TEM, XRD, Raman, and XPS), and control experiments, we identified that the exceptional Tl(I) removal performance of S@nZVI was attributed to its unique micro-galvanic cell effect. Furthermore, the effects of preparation conditions, adsorbent dosage, reaction temperature, solution pH, and long-term stability on Tl(I) removal by S@nZVI were systematically investigated. This work offers valuable insights for the design of high-performance S-nZVI for Tl(I) removal.
铊（Tl）是一种对哺乳动物毒性极强的污染物，从工业废水中去除铊已成为一项严峻的环境挑战。尽管硫化纳米零价铁（S-nZVI）被广泛认为是一种有效的重金属吸附剂，但其从废水中去除Tl（I）的效果仍不明确。在这项工作中，使用不同的后硫化方法合成了四种S-nZVI样品，并对它们去除Tl（I）的性能进行了评估和比较。结果表明，S@nZVI表现出比其他S-nZVI样品（9%-15%）显著更高的Tl（I）去除效率（180分钟内达到98%）。结合经验模型分析（吸附动力学和等温线）、表征（TEM、XRD、拉曼和XPS）以及对照实验，我们确定S@nZVI卓越的Tl（I）去除性能归因于其独特的微电池效应。此外，还系统研究了制备条件、吸附剂用量、反应温度、溶液pH值以及长期稳定性对S@nZVI去除Tl（I）的影响。这项工作为设计用于去除Tl（I）的高性能S-nZVI提供了有价值的见解。
