Aging study on carboxymethyl cellulose-coated zero-valent iron nanoparticles in water: Chemical transformation and structural evolution

Dong, Haoran; Zhao, Feng; Zeng, Guangming; Tang, Lin; Fan, Changzheng; Zhang, Lihua; Yun, Zeng; He, Qi; Xie, Yankai; Wu, Yanan

doi:10.1016/j.jhazmat.2016.03.069

Cited by 86 publications

(28 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A fundamental understanding of the kinetics and mechanisms of the nZVI corrosion in water is of great importance to predict nZVI’s stability and reactivity toward contaminants in water. However, controversial reports have been published to date with respect to the rate constants of nZVI corrosion, the morphologies and compositions of corrosion products, and the reaction mechanisms (Dong, Zhao, et al, ; Filip et al, ; Li, Qin, & Guan, ; Liu, Majetich, Tilton, Sholl, & Lowry, ; Reardon, Fagan, Vogan, & Przepiora, ; Sarathy et al, ). The controversies might be resulted from the different experimental conditions, for example, iron types, concentration of dissolved oxygen, water compositions, and so on.…”

Section: Physicochemical Transformation Of Nzvi In Watermentioning

confidence: 99%

“…Therefore, the surface stabilizers could possibly influence aging process of nZVI particles. The present authors have compared the compositional evolution of bare nZVI and CMC‐coated nZVI in static water (under anaerobic conditions) in a period of 90 days (Dong, Zhao, et al, ). It was found that the coating of CMC could slow down the oxidation rate of nZVI.…”

Section: Physicochemical Transformation Of Nzvi In Watermentioning

confidence: 99%

“…N anoscale zero‐valent iron (nZVI) has been widely used as a reactive nanomaterial for remediating groundwater contaminated with organic pollutants (e.g., chlorinated solvents) and inorganic pollutants (e.g., heavy metals and nutrients) (Deng et al, ; Dong, Zhang, et al, ; Eljamal, Khalil, Sugihara, & Matsunaga, ; Eljamal, Eljamal, Khalil, Saha, & Matsunaga, ; Guan et al, ; Liu & Lowry, ; Zhang, ). While nZVI apparently has great potential for a range of remediation applications, there are important aspects of the environmental fate and effects of nZVI that are not yet well understood (Dong, Li, et al, ; Dong, Zhao, et al, ; Liu, Liu, & Zhang, ). One of the most significant uncertainties with implications for both engineering design and assessment of environmental risk is how nZVI particles change during immersion in aqueous environment (i.e., aging) (Eljamal, Mokete, Matsunaga, & Sugihara, ).…”

Section: Introductionmentioning

confidence: 99%

“…The formation of other Fe‐bearing mineral phases (e.g., siderite and vivianite) is also possible, which depends on the geochemical conditions under which the particles are exposed (Xie et al, ). Besides, the chemical compositions and physical structures of the aged nZVI also varied considerably among the different iron types (e.g., bare nZVI, surface‐coated nZVI, sulfide‐modified nZVI, and bimetallic iron nanoparticles) (Dong, Zhao, et al, ; Han & Yan, ; Kim et al, ; Liu et al, ; Sohn, Kang, Ahn, Woo, & Yang, ; Xie, Fang, Qiu, Tsang, & Liang, ).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Aging of zero‐valent iron‐based nanoparticles in aqueous environment and the consequent effects on their reactivity and toxicity

Dong

Wang

et al. 2019

Water Environment Research

Self Cite

View full text Add to dashboard Cite

A fundamental understanding of the long-term fate of nanoscale zero-valent iron (nZVI)-based particles in aqueous environment and the corresponding impacts on their reactivity and toxicity is essential for the responsible use and management of the nanoparticles in environmental applications. This paper comprehensively reviews the physicochemical transformations of nZVI-based particles and the consequent effects on the particle's reactivity and toxicity. The corrosions of nZVI in water under both anaerobic and aerobic conditions are summarized. The transformation of contaminant-bearing nZVI is also discussed. Besides, the factors influencing the transformation of nZVI (i.e., pH, typical anions and cations, natural organic matter, surface stabilizers, bimetal decoration, and sulfidation treatment) are summarized and discussed. In addition, the effects of particle aging on its reactivity and toxicity are discussed. Generally, the aging of nZVI-based particles would have negative impact on the removal of contaminants, especially for the degradation of organic pollutants. However, the aging process of nZVI-based particles would cause a significant reduction in their toxicity. It is suggested that the nZVI-based particles would finally transform to less toxic or benign materials (i.e., iron (oxyhydr)oxides) over time. Finally, future perspectives are proposed to better quantify and predict the transformation of nZVI-based particles in aqueous environment. © 2019 Water Environment Federation • Practitioner points• The corrosion rates and products of nZVI in water varied much under anaerobic and aerobic conditions. • Typical anions and cations, natural organic matter, and iron types are critical factors influencing the physicochemical transformation of nZVI. • The aging of nZVI would have negative impact its reactivity, especially for the degradation of organic pollutants. • Although the fresh nZVI exhibits obvious toxicity, the aging process would cause a significant reduction in its toxicity.

show abstract

Section: Physicochemical Transformation Of Nzvi In Watermentioning

confidence: 99%

Section: Physicochemical Transformation Of Nzvi In Watermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Aging of zero‐valent iron‐based nanoparticles in aqueous environment and the consequent effects on their reactivity and toxicity

Dong

Wang

et al. 2019

Water Environment Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…nZVI has recently become a suitable alternative for the treatment of Cr(VI)-contaminated water due to its high reduction capacity and large specific surface area, indicating a high efficiency and low environmental cost [9][10][11]. However, limitations remain for applying nZVI technology to contaminant control due to the agglomeration tendency of nZVI particles [12,13].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Activated Carbon Supported Bead String Structure Nano Zero Valent Iron in a Polyethylene Glycol-Aqueous Solution and Its Efficient Treatment of Cr(VI) Wastewater

et al. 2019

View full text Add to dashboard Cite

Nanometer zero-valent iron (nZVI) has been widely used in the treatment of heavy metals such as hexavalent chromium (Cr(VI)). A novel composite of bead string-structured nZVI on modified activated carbon (nZVI-MAC) is prepared here, using polyethylene glycol as the stable dispersant rather than traditional ethanol during the loading process. The microstructure characterization shows that nZVI particles are loaded on MAC with a bead string structure in large quantity and stably due to the addition of hydroxyl functional groups on the surface by polyethylene glycol. Experiments on the treatment of Cr(VI) in wastewater show that the reaction process requires only 20 min to achieve equilibrium. The removal rate of Cr(VI) with a low concentration (80-100 mg/L) is over 99% and the maximum saturation removal capacity is up to 66 mg/g. The system converts Cr(VI) to trivalent chromium (Cr(III)) through an oxidation-reduction effect and forms an insoluble material with iron ions by coprecipitation, which is then adsorbed on the surface of the nZVI-MAC. The process conforms to the quasi-second order adsorption kinetics equation (mainly chemical adsorption process).

show abstract

In Situ Chemical Reduction of Chlorinated Organic Compounds

Rodrigues

Betelu

Colombano

et al. 2020

Environmental Soil Remediation and Rehabilitation

View full text Add to dashboard Cite

Chlorinated organic compounds (COCs) are common anthropogenic contaminants of soil and groundwater. COCs were industrially produced for different applications, such as dry cleaning, degreasing, or as pesticides. The presence of COCs in the environment is a major concern because of their toxicity and persistence.The most widely used method for their remediation is the conventional pump-and-treat system. However, this technology can hardly achieve a complete remediation because of geological characteristics and the presence of pore space pollution/adsorbed pollution, leading to a residual saturation. Hence, in addition to the improvement of pump-and-treat systems, in situ chemical processes have been largely developed. These chemical processes involve the injection of chemical reagents for the removal of residual source pollution and/or the treatment of plume contamination. Chemical degradation of COCs can be achieved by oxidative or reductive processes. If chemical oxidation has been first developed for in situ application, chemical reduction is one of the most important emerging remediation techniques for COCs treatment. Due to the electronegative character of chlorine substituents, COCs can effectively be transformed via reductive pathways. Moreover, reductive dechlorination has shown higher efficiency on highly chlorinated compounds. This chapter focuses on the presentation of the chemical reduction of the most common COCs pollutants, followed by kinetic and mechanistic approaches related to the use of iron-based particles. Developments on in situ chemical reduction technologies in order to enhance remediation rates are also exposed. Influence of environmental conditions for in situ applications is then developed. Finally, a case study is presented.

show abstract

Aging study on carboxymethyl cellulose-coated zero-valent iron nanoparticles in water: Chemical transformation and structural evolution

Cited by 86 publications

References 46 publications

Aging of zero‐valent iron‐based nanoparticles in aqueous environment and the consequent effects on their reactivity and toxicity

Aging of zero‐valent iron‐based nanoparticles in aqueous environment and the consequent effects on their reactivity and toxicity

Preparation of Activated Carbon Supported Bead String Structure Nano Zero Valent Iron in a Polyethylene Glycol-Aqueous Solution and Its Efficient Treatment of Cr(VI) Wastewater

In Situ Chemical Reduction of Chlorinated Organic Compounds

Contact Info

Product

Resources

About