The dual effects of carboxymethyl cellulose on the colloidal stability and toxicity of nanoscale zero-valent iron

Dong, Haoran; Xie, Yankai; Zeng, Guangming; Tang, Lin; Liang, Jie; He, Qi; Zhao, Feng; Yun, Zeng; Wu, Yanan

doi:10.1016/j.chemosphere.2015.10.066

Cited by 98 publications

(29 citation statements)

References 49 publications

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“…The present authors investigated the toxicity of the aged nZVI (15–30 days) toward Escherichia coli ( E. coli ) (Dong, Xie, et al, ). The inactivation of E. coli by nZVI was significantly receded with the aging time.…”

Section: Effect Of Aging On Nzvi’s Toxicitymentioning

confidence: 99%

“…Reinsch et al () reported that these iron (hydr)oxides may reduce the adhesion of the nanoparticles to the microbe cells and inhibit electron transfer, and therefore reduce the particle's toxicity to E. coli . In addition, we also examined the toxicity of the aged CMC stabilized nZVI (CMC‐nZVI) toward E. coli (Dong, Xie, et al, ). It was found that even though the high content of Fe 0 still retained in the aged CMC‐nZVI, no obvious toxic effect was observed.…”

Section: Effect Of Aging On Nzvi’s Toxicitymentioning

confidence: 99%

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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

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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.

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Section: Effect Of Aging On Nzvi’s Toxicitymentioning

confidence: 99%

Section: Effect Of Aging On Nzvi’s Toxicitymentioning

confidence: 99%

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

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“…•-4 + 2 → • + 2 -4 + + (5) 2Fe 3 + + 0 → 3 2 + However, strong magnetic attraction and van der waals force between nZVI nanoparticles cause them to aggregate into larger size particles [12][13][14][15][16][17][18]. The increased size of these cluster result in a sharp decrease in surface area and poor dispersion of nZVI in aqueous solution [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…The increased size of these cluster result in a sharp decrease in surface area and poor dispersion of nZVI in aqueous solution [13,14]. Thus, to overcome the aggregation of nZVI, researchers have attempted different stabilization methods for its effective environmental application [12,19,20]. Some supporting materials (e.g., clay, zeolite and biochar) and surface stabilizers (e.g., surfactant, synthetic or natural macromolecule or polyelectrolyte) were chosen to stabilize nZVI [12].…”

Section: Introductionmentioning

confidence: 99%

Ca(OH)2 coated nanoscale zero-valent iron as a persulfate activator for the degradation of sulfamethazine in aqueous solution

Deng

Dong

et al. 2019

Separation and Purification Technology

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In this work, a novel composite, Ca(OH) 2 coated nanoscale zero-valent iron (denoted as nZVI-Ca(OH) 2), was synthesized and used as an activator of persulfate for the degradation of sulfamethazine (SMT). The effects of sonication time during composite synthesis, pH, nZVI-Ca(OH) 2 dosage and typical groundwater components were investigated by batch experiments. Sonication time during the synthesis of the composite could affect the thickness of Ca(OH) 2 shell, however, it exerted no obvious effect on SMT removal by nZVI-Ca(OH) 2 activated persulfate. The initial pH also had insignificant effect on SMT removal in nZVI-Ca(OH) 2 /persulfate system. There was an optimum dosage of nZVI-Ca(OH) 2 composites for the activation of persulfate, and the SMT removal efficiency decreased at both higher and lower dosage. The efficient performance of nZVI-Ca(OH) 2 in synthetic groundwater was observed over a wide pH range (3-9). However, with the presence of high concentration of HCO 3or SO 4 2-, SMT removal was inhibited greatly due to the quenching of radicals by HCO 3or SO 4 2and the buffering effect of HCO 3-. In addition, the longevity of nZVI-Ca(OH) 2 was also investigated. Even after 30 days of aging in the air, Fe 0 could still be detected in nZVI-Ca(OH) 2. Despite some loss of Fe 0 , the composites kept high reactivity for activation of persulfate for SMT removal, which might be attributed to the excellent activation ability of amorphous iron oxides. To sum up, the Ca(OH) 2shell can protect the inner iron core and consequently prolong the lifetime of nZVI.

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“…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]. The nZVI particles are prone to agglomeration, causing obvious decreases in the reduction capacity and specific surface area of the particles [3,12,14,15].…”

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

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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).

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The dual effects of carboxymethyl cellulose on the colloidal stability and toxicity of nanoscale zero-valent iron

Cited by 98 publications

References 49 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

Ca(OH)2 coated nanoscale zero-valent iron as a persulfate activator for the degradation of sulfamethazine in aqueous solution

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

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