Author
Xiao-qin Li
Other affiliations: National Institute of Standards and Technology, Lehigh University
Bio: Xiao-qin Li is an academic researcher from Center for Advanced Materials. The author has contributed to research in topics: Zerovalent iron & X-ray photoelectron spectroscopy. The author has an hindex of 10, co-authored 12 publications receiving 3752 citations. Previous affiliations of Xiao-qin Li include National Institute of Standards and Technology & Lehigh University.
Papers
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TL;DR: Zero-valent iron nanoparticles (nZVI) are becoming an increasingly popular choice for treatment of hazardous and toxic wastes, and for remediation of contaminated sites as mentioned in this paper, and more than 20 projects have been completed or ongoing in North America, Europe, and Asia.
Abstract: Zero-valent iron nanoparticle technology is becoming an increasingly popular choice for treatment of hazardous and toxic wastes, and for remediation of contaminated sites. In the U.S. alone, more than 20 projects have been completed since 2001. More are planned or ongoing in North America, Europe, and Asia. The diminutive size of the iron nanoparticles helps to foster effective subsurface dispersion whereas their large specific surface area corresponds to enhanced reactivity for rapid contaminant transformation. Recent innovations in nanoparticle synthesis and production have resulted in substantial cost reductions and increased availability of nanoscale zero-valent iron (nZVI) for large scale applications. In this work, methods of nZVI synthesis and characterization are highlighted. Applications of nZVI for treatment of both organic and inorganic contaminants are reviewed. Key issues related to field applications such as fate/transport and potential environmental impact are also explored.
963 citations
TL;DR: This work presents a systematic characterization of the iron nanoparticles prepared with the method of ferric iron reduction by sodium borohydride and results may foster better understanding, facilitate information exchange, and contribute to further research and development of Iron nanoparticles for environmental and other applications.
871 citations
TL;DR: In this paper, applications of nanoscale zerovalent iron (nZVI) for removal of metal cations in water are investigated with the result that nZVI has much larger capacity than conventional materials for the seques.
Abstract: Applications of nanoscale zerovalent iron (nZVI) for removal of metal cations in water are investigated with the result that nZVI has much larger capacity than conventional materials for the seques...
565 citations
TL;DR: It is demonstrated that iron nanoparticles function as a sorbent and a reductant for the sequestration of Ni(II) in water and may offer efficient and unique solutions for the separation and transformation of metal ions and other environmental contaminants.
Abstract: It is demonstrated that iron nanoparticles function as a sorbent and a reductant for the sequestration of Ni(II) in water. A relatively high capacity of nickel removal is observed (0.13 g Ni/g Fe, or 4.43 mequiv Ni(II)/g), which is over 100% higher than the best inorganic sorbents available. High-resolution X-ray photoelectron spectroscopy (HR-XPS) confirms that the zerovalent iron nanoparticles have a core-shell structure and exhibit characteristics of both hydrous iron oxides (i.e., as a sorbent) and metallic iron (i.e., as a reductant). Ni(II) quickly forms a surface complex and is then reduced to metallic nickel on the nanoparticle surface. The dual properties of iron nanoparticles may offer efficient and unique solutions for the separation and transformation of metal ions and other environmental contaminants.
412 citations
TL;DR: In this paper, a method for the synthesis of fully dispersed and reactive nanoscale particles of zero-valent iron is presented, which leads to significant enhancements in surface chemistry, particle stability and subsurface mobility potential.
375 citations
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2,970 citations
TL;DR: This review critiques existing nanomaterial research in freshwater, marine, and soil environments and illustrates the paucity of existing research and demonstrates the need for additional research.
Abstract: The recent advances in nanotechnology and the corresponding increase in the use of nanomaterials in products in every sector of society have resulted in uncertainties regarding environmental impacts. The objectives of this review are to introduce the key aspects pertaining to nanomaterials in the environment and to discuss what is known concerning their fate, behavior, disposition, and toxicity, with a particular focus on those that make up manufactured nanomaterials. This review critiques existing nanomaterial research in freshwater, marine, and soil environments. It illustrates the paucity of existing research and demonstrates the need for additional research. Environmental scientists are encouraged to base this research on existing studies on colloidal behavior and toxicology. The need for standard reference and testing materials as well as methodology for suspension preparation and testing is also discussed.
2,566 citations
TL;DR: This review presents an overview of the classes of NP relevant to the environment and summarizes their formation, emission, occurrence and fate in the environment.
2,093 citations
TL;DR: This review outlined the latest applications of iron oxide nanomaterials in wastewater treatment, and gaps which limited their large-scale field applications, as well as the outlook for potential applications and further challenges.
1,632 citations
TL;DR: An overview of the recent advances of ZVI and progress obtained during the groundwater remediation and wastewater treatment utilizing ZVI (including nanoscale zero-valent iron (nZVI)) for the removal of contaminants.
1,273 citations