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Nanoscale Pd/Fe bimetallic particles: Catalytic effects of palladium on hydrodechlorination
Hsing-Lung Lien,Wei-xian Zhang +1 more
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TLDR
In this article, a study on the catalytic properties of palladium for hydrodechlorination using nanoscale zero-valent iron particles is presented. But the results of the study were limited to the case of chlorinated ethylenes.Abstract:
Reported herein is a study on the catalytic properties of palladium for hydrodechlorination using nanoscale zero-valent iron particles. Temperature-dependent experiments and X-ray diffraction (XRD) are conducted to characterize reactions of chlorinated ethylenes with nanoscale Fe and Pd/Fe particles. XRD results suggest bimetallic structures are created as a result of Pd(II) reduction by zero-valent iron and the degree of surface palladium loading is proportional to the initial amount of palladium applied. The optimal content of palladium in the bimetallic particles for dechlorination is in the range of 1–5% by weight. XRD analyses further suggest that oxidation of iron produces mainly iron oxides. No oxidized species of palladium (e.g., PdO) is found before or after the reactions. Activation energies of the dechlorination reactions with the nanoscale Pd/Fe and Fe particles are estimated to be 31.1 and 44.9 kJ/mol, respectively. A conceptual model for the catalytic hydrodechlorination by the nanoscale Pd/Fe particles is presented.read more
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Nanoscale zero-valent iron: Future prospects for an emerging water treatment technology
TL;DR: The fundamental importance of being able to accurately predict the long-term physical, chemical and biological fate of contaminated sites following nZ VI treatment is emphasised and, as part of this, a universal empirical testing framework for nZVI is suggested.
Journal ArticleDOI
Nanoscale zero valent iron and bimetallic particles for contaminated site remediation
Denis M. O'Carroll,Denis M. O'Carroll,Brent E. Sleep,Magdalena M. Krol,Hardiljeet K. Boparai,C. M. Kocur +5 more
TL;DR: The use of nano zero valent iron (nZVI) for groundwater remediation has been investigated for its potential to reduce subsurface contaminants such as PCBs, chlorinated solvents, and heavy metals.
Journal ArticleDOI
Iron nanoparticles for environmental clean-up: recent developments and future outlook.
TL;DR: An up-to-date account of advancement in materials chemistry, reactivity with a wide spectrum of contaminants in addition to the well-documented chlorinated solvents, methods to enhance the colloidal stability and transport properties of nZVI in porous media, and the effects of n ZVI amendment on the biogeochemical environment are provided.
Journal ArticleDOI
Nanocatalysts and other nanomaterials for water remediation from organic pollutants
Feng Lu,Didier Astruc +1 more
TL;DR: In this paper, the types and structures of organic pollutants, and the classes of nanomaterials and their application for the remediation of organic contaminants in water are systematically summarized.
Journal ArticleDOI
Green Synthesis of Fe and Fe/Pd Bimetallic Nanoparticles in Membranes for Reductive Degradation of Chlorinated Organics.
TL;DR: In this article, green tea extract was used for nanoparticle (NP) synthesis, instead of the well-known sodium borohydride, which can act as both chelating/reducing and capping agents for the nanoparticles.
References
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Book
Elements of X-ray diffraction
TL;DR: In this article, the authors present a chemical analysis of X-ray diffraction by Xray Spectrometry and phase-diagram Determination of single crystal structures and phase diagrams.
Journal ArticleDOI
Nanoscale Iron Particles for Environmental Remediation: An Overview
TL;DR: Nanoscale iron particles represent a new generation of environmental remediation technologies that could provide cost-effective solutions to some of the most challenging environmental cleanup problems as mentioned in this paper, and they provide enormous flexibility for in situ applications.
Journal ArticleDOI
Synthesizing Nanoscale Iron Particles for Rapid and Complete Dechlorination of TCE and PCBs
Chuan-Bao Wang,Wei-xian Zhang +1 more
TL;DR: In this article, an efficient method of synthesizing nanoscale (1−100 nm) iron and palladized iron particles is presented, which is characterized by high surface area to volume ratios and high reactivities.
Journal ArticleDOI
Reductive Dehalogenation of Chlorinated Methanes by Iron Metal
TL;DR: The reduction of chlorinated methanes in batch model systems appears to be coupled with oxidative dissolution (corrosion) of the iron through a largely diffusion-limited surface reaction.
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