In the presence of Al-pillared bentonite with good sorption capacity, nanoscale zero-valent iron supported on Al-pillared bentonite (NZVI/Al-PILC) was prepared with NaBH4 and FeSO4 aqueous solution. The structure of NZVI/Al-PILC was characterized by X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET). The effects of pH values and initial chromium (VI) concentrations on its removal rate by NZVI/Al-PILC were investigated, and were compared with those of unsupported nanoscale zero-valent iron (NZVI) containing the same iron mount of NZVI/Al-PILC. The results indicate that in the same experimental condition, the chromium (VI) removal by NZVI/Al-PILC reached 100% after 120 min. The removal is not only much higher than that (63.0%) of the NZVI containing same iron mount, but also superior to the sum of removal (75.4%) by NZVI containing the same iron amount and the Al-pillared bentonite containing the same clay amount with NZVI/Al-PILC.
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Toxics
January 2025
School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211816, China.
Recently, the activation of chlorine dioxide (ClO) by metal(oxide) for soil remediation has gained notable attention. However, the related activation mechanisms are still not clear. Herein, the variation of iron species and ClO, the generated reactive oxygen species, and the toxicity of the degradation intermediates were explored and evaluated with nanoscale zero-valent iron (nFe) being employed to activate ClO for soil polycyclic aromatic hydrocarbon (PAH) removal.
View Article and Find Full Text PDFEnviron Res
January 2025
School of Environment, South China Normal University, Guangzhou 510006, China; Guangdong T'echnology Research Center for Ecological Management and Remediation of Water System, Guangzhou 510006, china.
Nano zero-valent iron (nZVI) is widely used for polychlorinated biphenyl (PBDE) remediation due to its cost-effectiveness and strong reduction capacity. However, its practical application is limited by poor stability, mobility, and antioxidant performance, as well as high reactivity that leads to side reactions and activity loss. To overcome these challenges, a poly(styrene)-encapsulated nZVI (PS-nZVI) core-shell structure was developed using dispersion polymerization.
View Article and Find Full Text PDFJ Hazard Mater
January 2025
Department of Civil and Environmental Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea; Department of Environmental Engineering, Graduate School, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea. Electronic address:
The synthesis of coal bottom ash-induced zeolite (Si-Al material) has been widely reported; however, the selective recovery of the three main elements, viz., Si, Al, and Fe, from coal bottom ash for the synthesis of reactive adsorbents has not yet been reported. In this study, we separated the magnetic and non-magnetic fractions of coal bottom ash to selectively recover Fe and Si-Al for synthesizing nanoscale zero-valent iron@zeolite (NZVI@ZBA) composites with uniform formation of Fe(0) nanoparticles on the ZBA surface.
View Article and Find Full Text PDFEnviron Res
January 2025
School of Environment and Energy, Peking University Shenzhen Graduate School, University Town, Xili, Nanshan District, 518055, Shenzhen, China.
This work evaluated the effect of zero-valent iron (ZVI) particle size (150 μm-100 nm) on the performance of food waste anaerobic digestion (AD) under various acid stress conditions. The results indicated that ZVI significantly improved the AD performance, ensuring successful CH production even under high acid stress. However, the extent of this promoting effect was highly dependent on the particle size.
View Article and Find Full Text PDFJ Environ Manage
January 2025
Fujian Key Laboratory of Pollution Control and Resource Reuse, School of Environmental and Resource Sciences, Fujian Normal University, Fuzhou, 350117, Fujian Province, China. Electronic address:
Carbon-encapsulated nanoscale zero-valent-iron (C@Fe) derived from plant-based extracts has been the subject of growing interest due to its environmental friendliness. However, the effects of various pyrolysis atmospheres on the structure-function connections of C@Fe are still unclear. In this study, three pyrolytic atmospheres, namely Air, N, and 5% H/Ar were selected to fabricate X-C@Fe (X represented as A, N, H) for removing 2,4,6-Trichlorophenol (TCP), and the relationships between their structures and functions were demonstrated.
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