MXenes, as new members of the 2D materials group, are regarded as good candidates for heavy metal removal particularly for radioactive metal element because of their high irradiation stability. However, the small interlayer distance and lack of active sites on the surface limit their further application. In this report, nanoscale zero-valent iron has been introduced into the inter-layer structure of alkaline intercalated TiC (Alk-TiC) and investigated to Cr(VI) removal. The XPS spectra, SEM images, TEM images, and N adsorption-desorption isotherms characterizations revealed that the OH groups on the Alk-TiC surface assisted the introducing of nZVI into the inter-layer of Alk-TiC and subsequently stabilized the nZVI. The increased active sites of nZVI and extended interlayer space of Alk-TiC could improve the uptake capacity of Cr(VI) (194.87 mg/g at pH = 2). The highly efficient removal of Cr(VI) was maintained even in the presence of coexisting cations, which showed great potential for real environment remediation. Mechanistic study indicated that the synergistic effects of nZVI and Alk-TiC nanosheet in nZVI-Alk-TiC composites are keys for Cr(VI) removal.
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http://dx.doi.org/10.1016/j.jhazmat.2019.121761 | DOI Listing |
J Environ Manage
December 2024
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.
View Article and Find Full Text PDFJ Environ Manage
December 2024
INDUROT and Environmental Biogeochemistry & Raw Materials Group, Campus of Mieres, University of Oviedo, 33600, Mieres, Spain.
Here we describe two innovative approaches for remediating sediments contaminated with organotin compounds (OTCs, mainly TBT) and metal(loid)s. The first involves chemical stabilization through amendments with nanoscale zero-valent iron (nZVI), dunite mining waste, and coal tailings, materials that have not been previously studied for OTC remediation. The second focuses on physical soil washing, using grain-size separation and magnetic separation to isolate the most polluted fractions, thereby reducing the volume of contaminated material destined for landfills.
View Article and Find Full Text PDFJ Environ Manage
December 2024
Korea Biochar Research Center, Division of Environmental Science and Ecological Engineering, Korea University, Seoul, 02841, Korea.
Pristine or modified nanoscale zero-valent iron (nZVI) synthesized though conventional chemical reduction have been widely recommended for remediating metal(loid)-contaminated water. However, their eco-friendliness is often challenged with the concomitant bio-toxicity and secondary environmental risks. Alternatively, this study utilized waste tea leaves extract and remaining residue as the reducing agent and pyrolytic matrix to innovatively fabricate a green synthesized nZVI impregnated tea residue biochar (G-nZVI/TB).
View Article and Find Full Text PDFInt J Biol Macromol
December 2024
Centre for Applied Research, Saveetha School of Engineering, Saveetha institute of Medical and Technical Sciences (SIMATS), Chennai, Tamil Nadu 602105, India.
Recent advances in nanotechnology, particularly those utilizing polymeric nanocomposites, have garnered significant attention for their effectiveness and biocompatibility in cancer diagnosis and treatment. In this study, a chitosan-okra mucilage polymeric nanocomposite doped with nano zero-valent iron (CS-OM-nZVI), synthesized using green chemistry principles, was evaluated for its anti-cancer activity against drug-resistant oral carcinoma cells (KBChR). The nanocomposite was created from chitosan, mucilage derived from okra biomass, and nano zerovalent iron particles synthesized through chemical reduction.
View Article and Find Full Text PDFSci Total Environ
December 2024
State Key Laboratory for Pollution Control, School of Environmental Science and Engineering, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai 200092, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China. Electronic address:
Rice, as the most essential food grain, is frequently exposed to high concentrations of arsenic. Among the arsenic species, dimethylarsenate (DMAs(V)) is preferentially translocated from paddy soils to rice grains, posing serious threats to food safety and yield. Herein, we report an efficient strategy for DMAs(V) mitigation in paddy soils with nanoscale Zero-Valent Iron (nZVI).
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