文献类型：期刊文献

英文题名：Carbon-containing materials coupled with sulfidized nanoscale zero-valent iron effective sequestration of U(VI) and their microbial toxicity to bacteria and fungi

作者：Liang, Liping[1,2]; Wu, Yishun[1]; Tan, Weishou[2]; Xi, Fenfen[3]; Zhang, Yun[1]; Zhao, Jinhui[1]; Meng, Xu[1]; Ma, Jianfeng[1]

机构：[1] School of Environmental Science and Engineering, Changzhou University, Changzhou, 213164, China; [2] School of Life and Environmental Science, Shaoxing University, Shaoxing, 312000, China; [3] College of Chemistry and Chemical Engineering, Donghua University, Shanghai, 201620, China

年份：2025

卷号：726

外文期刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects

收录：EI(收录号：20253419024703)、Scopus(收录号：2-s2.0-105013645155)

语种：英文

外文关键词：Bacteria - Coordination reactions - Graphene - Graphitic Carbon Nitride - Iron oxides - Oxidative stress - Toxicity - X ray absorption - X ray absorption near edge structure spectroscopy - X ray photoelectron spectroscopy

外文摘要：This study successfully synthesized g-C3N4-S-nZVI and rGO-S-nZVI composites for U(VI) sequestration and for the assessment of microbial toxicity to bacteria and fungi. The maximum U(VI) adsorption capacities of g-C3N4-S-nZVI and rGO-S-nZVI were 662.3 mg/g and 578.0 mg/g at pH = 6.0, respectively. The adsorption kinetics followed the pseudo-second-order model, and the isotherm data were well-described by the Langmuir model. The composites had a good application prospect due to their excellent resistance to ionic interference and favorable recyclability. Analysis via X-ray absorption near-edge structure (XANES), X-ray photoelectron spectroscopy (XPS), and extended X-ray absorption fine structure (EXAFS) confirmed that U(VI) removal occurred primarily through chemisorption, with uranyl ions forming a bidentate mononuclear edge-sharing coordination complex on the iron oxide surface. The presence of reactive oxygen species inhibited the reduction of U(VI) to U(IV). Fungal toxicity assays indicated good biocompatibility of g-C3N4 and rGO, while S-nZVI and its composites exhibited significant inactivation of Arthrographis arxii. The inactivation mechanism involves the synergistic effects of physical contact, dissolved Fe2+, and ROS generation. Sediment microbial community analysis revealed that S-nZVI caused the greatest disturbance to bacterial communities, while the composites formation mitigated their influence. It is worth noting that g-C3N4-S-nZVI exhibited the most significant anti-fungal efficacy, whereas rGO-S-nZVI had a relatively small impact on bacterial and fungal communities. This research not only provides an effective method for removing U(VI), but also clarifies the impact of material use on environmental microorganisms. ? 2025 Elsevier B.V.