Mei Shou, Liu Longjie, Du Yiqing, Wang Rongling, Zhan Ziyi, Qin Aoxue, Zhao Shenglan, Ye Yuxuan, Deng Yuwei, Li Qiang, Pan Fei
School of Resources and Environment, Wuhan Textile University, Wuhan, 430200, China.
School of Resources and Environment, Wuhan Textile University, Wuhan, 430200, China; State Key Laboratory of New Textile Materials and Advanced Processing, Wuhan Textile University, Wuhan, 430200, China.
Environ Res. 2025 Oct 15;283:122119. doi: 10.1016/j.envres.2025.122119. Epub 2025 Jun 9.
Developing strategies for efficient and durable reduction of Cr(VI) in wastewater is still a desirable and challenging task. Herein, we successfully load the iron-sulfur composite (FeS) uniformly on the melamine sponge (MS) through in-situ deposition to form a three-dimensional composite FeS/MS. Compared with typical iron minerals (e.g., FeS), FeS/MS was significantly better at removing Cr(VI) in water, with the removal rate increased from 14.78 % to 99.44 %. The reaction kinetics of FeS/MS (0.1011 min) was 37 times that of FeS (0.0027 min). SEM-EDS results showed that FeS was uniformly loaded on the sponge, forming a high density of active sites. XPS analysis displayed that the proportion of SO was increased from 39.22 % to 61.18 %, implying the involvement of FeS/MS in the reduction of Cr(VI). Tafel scanning and cyclic voltammetry (CV) results confirmed that the enhanced reduction performance was attributed to the accelerated electron transfer and sufficient electron supply capability. Additionally, the deposition of Cr(OH) on FeS/MS is evidenced to be responsible for eliminating total Cr from water. The influence of water chemistry, i.e., pH, Cr(VI) concentration, and co-existed substances, on Cr(VI) removal during FeS/MS treatment was systematically examined. The removal capacity of Cr(VI) in tap water, natural water, and industrial wastewater, is more than 90 %, suggesting a strong anti-interference ability of FeS/MS. The rapid flow dynamic simulation experiment demonstrates that FeS/MS can achieve efficient removal of Cr(VI) and slow-releasing of Fe. The removal rate of Cr(VI) reached 100 % in the first 10 cycles, whereas the final effluent concentration was only 0.14 mg/L. This study provides a rational design of corresponding approaches to deal with Cr(VI) pollution.
开发高效且持久地还原废水中六价铬（Cr(VI)）的策略仍然是一项理想但具有挑战性的任务。在此，我们通过原位沉积成功地将铁硫复合材料（FeS）均匀负载在三聚氰胺海绵（MS）上，形成三维复合FeS/MS。与典型的铁矿物（如FeS）相比，FeS/MS在去除水中Cr(VI)方面表现显著更好，去除率从14.78%提高到99.44%。FeS/MS的反应动力学（0.1011分钟）是FeS（0.0027分钟）的37倍。扫描电子显微镜-能谱分析（SEM-EDS）结果表明，FeS均匀负载在海绵上，形成了高密度的活性位点。X射线光电子能谱（XPS）分析显示，SO的比例从39.22%增加到61.18%，这意味着FeS/MS参与了Cr(VI)的还原。塔菲尔扫描和循环伏安法（CV）结果证实，增强的还原性能归因于加速的电子转移和充足的电子供应能力。此外，有证据表明FeS/MS上Cr(OH)的沉积有助于从水中去除总铬。系统研究了水化学因素，即pH值、Cr(VI)浓度和共存物质，对FeS/MS处理过程中Cr(VI)去除的影响。FeS/MS对自来水、天然水和工业废水中Cr(VI)的去除能力超过90%，表明其具有很强的抗干扰能力。快速流动动态模拟实验表明，FeS/MS能够实现对Cr(VI)的高效去除和铁的缓慢释放。在前10个循环中，Cr(VI)的去除率达到100%，而最终出水浓度仅为0.14毫克/升。本研究为处理Cr(VI)污染提供了相应方法的合理设计。
