Ai-Hua Cheng, Jing Wang, Zhi Li, Juan Chang, Xiao-He Liu
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引用次数: 0
Abstract
Cr(VI) contamination in soil poses a significant challenge worldwide, necessitating effective remediation strategies to ensure the preservation of human health and ecological integrity. On-location remediation of Cr(VI)-contaminated soil using reactive materials that exhibit synergistic reduction and adsorption properties has emerged as a promising approach. This study introduces a novel remediation material, FeS-modified carbon aerogel (FeS/CA), with a laminated porous structure rich in adsorption and reduction sites, synthesized through a straightforward freeze-drying method using economical, readily available chitosan. The results show that FeS/CA immobilized 99.87% of Cr(VI) by 16 g FeS/CA per kg of soil over 15 days, significantly outperforming pure CA, which achieved only 32.20% efficiency. Subsequent analysis demonstrates that the exchangeable chromium was nearly entirely converted to residual chromium (93.78%), thereby diminishing the risk of heavy metal contamination in soil. The remediation mechanism of FeS/CA on Cr(VI) was revealed by XPS, FTIR, and other characterizations, and the homogeneous FeS nanoparticles and abundant functional groups in CA played an important role in the immobilization of Cr(VI). FeS/CA promoted the immobilization of Cr(VI) mainly by the synergistic adsorption and chemical reduction effects. Firstly, part of Cr(VI) entered into the pore space of FeS/CA by physical adsorption. Secondly, the functional groups containing C and O adsorbed Cr(VI) through chemical effects, and finally, Fe(II) and S(-II) provided electrons during the adsorption of Cr(VI) to reduce Cr(VI) to Cr(III). In conclusion, the FeS/CA composite, characterized by its effective laminated porous structure, offers a viable solution for remediation of Cr-contaminated soil.
土壤中铬(VI)污染是全球面临的一个重大挑战,需要有效的修复策略来确保保护人类健康和生态完整性。利用具有协同还原和吸附特性的活性材料原位修复Cr(VI)污染土壤已成为一种很有前途的方法。本研究介绍了一种新型的修复材料,FeS改性碳气凝胶(FeS/CA),具有丰富的吸附和还原位点的层状多孔结构,采用经济、易得的壳聚糖,通过直接的冷冻干燥方法合成。结果表明:FeS/CA在15 d内以每kg土壤16 g FeS/CA固定化Cr(VI)的效率为99.87%,显著优于纯CA的32.20%。随后的分析表明,交换性铬几乎全部转化为残余铬(93.78%),从而降低了土壤重金属污染的风险。通过XPS、FTIR等表征揭示了FeS/CA对Cr(VI)的修复机制,表明FeS纳米颗粒的均匀性和CA中丰富的官能团在固定化Cr(VI)中发挥了重要作用。FeS/CA主要通过协同吸附和化学还原作用促进Cr(VI)的固定化。首先,部分Cr(VI)通过物理吸附进入FeS/CA的孔隙空间。其次,含C和O的官能团通过化学作用吸附Cr(VI),最后,Fe(II)和S(-II)在吸附Cr(VI)过程中提供电子,使Cr(VI)还原为Cr(III)。综上所述,FeS/CA复合材料具有有效的层状多孔结构,为修复cr污染土壤提供了可行的解决方案。
期刊介绍:
The objective of the Journal of Nanoparticle Research is to disseminate knowledge of the physical, chemical and biological phenomena and processes in structures that have at least one lengthscale ranging from molecular to approximately 100 nm (or submicron in some situations), and exhibit improved and novel properties that are a direct result of their small size.
Nanoparticle research is a key component of nanoscience, nanoengineering and nanotechnology.
The focus of the Journal is on the specific concepts, properties, phenomena, and processes related to particles, tubes, layers, macromolecules, clusters and other finite structures of the nanoscale size range. Synthesis, assembly, transport, reactivity, and stability of such structures are considered. Development of in-situ and ex-situ instrumentation for characterization of nanoparticles and their interfaces should be based on new principles for probing properties and phenomena not well understood at the nanometer scale. Modeling and simulation may include atom-based quantum mechanics; molecular dynamics; single-particle, multi-body and continuum based models; fractals; other methods suitable for modeling particle synthesis, assembling and interaction processes. Realization and application of systems, structures and devices with novel functions obtained via precursor nanoparticles is emphasized. Approaches may include gas-, liquid-, solid-, and vacuum-based processes, size reduction, chemical- and bio-self assembly. Contributions include utilization of nanoparticle systems for enhancing a phenomenon or process and particle assembling into hierarchical structures, as well as formulation and the administration of drugs. Synergistic approaches originating from different disciplines and technologies, and interaction between the research providers and users in this field, are encouraged.