Carboxymethyl cellulose stabilized and sulfidated nanoscale zero-valent iron: Characterization and trichloroethene dechlorination

Xu, Wei; Li, Zhenjie; Shi, Shasha; Qi, Jianlong; Cai, Shichao; Yang, Yu; O'Carroll, D. M.; He, Feng

doi:10.1016/j.apcatb.2019.118303

Cited by 85 publications

(31 citation statements)

References 51 publications

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“…A more recent study reported that CMC stabilization of nZVI decreased 3 e for TCE by about 15-fold (0.43% to 0.03%) for nZVI and 5-fold (13% to 3.5%) for S-nZVI (at a S/Fe molar ratio ¼ 0.05). 57 These results suggest that modifying nZVI with polymers like CMC, poly(styrene sulfonate) (PSS), and polyaspartate (PAP) tends to decrease 3 e for organohalide reduction, but this has not been systematically evaluated.…”

Section: Effect Of Zvi Particle Properties On Electron Efficiencymentioning

confidence: 99%

“…4 shows that the benet of suldation is greatest for CMC-nZVI, which presumably is because this material has exceptionally higher reactivity with water (due to its very small particle size and exposed surface area). 57 Suldation of CMC-nZVI results in effectively complete inhibition of the HER, which allows high rates of TCE dechlorination to persist for more than a month. 40 Suldation also decreased the reaction of nZVI with competing oxidants that may be present in the water, e.g.…”

Section: Effect Of Zvi Particle Properties On Electron Efficiencymentioning

confidence: 99%

“…In comparison, the 3 e of TCE dechlorination by a variety of ZVI (nanoscale or microscale) under a range of experimental conditions (iron excess or TCE excess, pH: 6-10) was reported to be less than 8%. 29,39,57 Although the contaminant type (PCE vs. TCE) may cause some difference in 3 e due to differences in sorption affinity for the ZVI surfaces, the signicantly higher 3 e of Carbo-Iron® still suggests that the AC support can enhance the utilization efficiency of electrons for dechlorination.…”

Section: Effect Of Zvi Particle Properties On Electron Efficiencymentioning

confidence: 99%

“…Likely temporal changes of TCE concentration (left axis) and electron efficiency (right axis) during a scenario of source remediation by (A) regular ZVI and (B) sulfidated ZVI (the size of the pie represents the total capacity of Fe(0) and the slices represent selectivity toward TCE or H 2 O. Efficiency curve shown in B is based on the data of sulfidated CMC-nZVI reported in Fan et al68 and Xu et al57 ).This journal is © The Royal Society of Chemistry 2020 Environ. Sci.…”

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confidence: 99%

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Quantifying the efficiency and selectivity of organohalide dechlorination by zerovalent iron

Gong

Fan

et al. 2020

Environ. Sci.: Processes Impacts

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Section: Effect Of Zvi Particle Properties On Electron Efficiencymentioning

confidence: 99%

Section: Effect Of Zvi Particle Properties On Electron Efficiencymentioning

confidence: 99%

Section: Effect Of Zvi Particle Properties On Electron Efficiencymentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Quantifying the efficiency and selectivity of organohalide dechlorination by zerovalent iron

Gong

Fan

et al. 2020

Environ. Sci.: Processes Impacts

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“…In addition, it was proven that the high concentration of starch-stabilized nZVI (S-nZVI) can inhibit ramie growth and aggravate the oxidative damage to plants [1]. In order to improve the stability and mobility of nZVI and alleviate its toxicity, various modifications have been made, among which carboxymethyl cellulose (CMC)-stabilized nZVI (CMC-nZVI) is considered one of the most successful combinations, based on not only lab experiments but also field tests [10,[13][14][15][16]. CMC is a kind of polyelectrolytes with both carboxyl and hydroxyl groups [17].…”

Section: Introductionmentioning

confidence: 99%

Remediation of Cd-Contaminated Soil by Modified Nanoscale Zero-Valent Iron: Role of Plant Root Exudates and Inner Mechanisms

Huang

Yang

Deng

et al. 2021

IJERPH

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In this study, the role of exogenous root exudates and microorganisms was investigated in the application of modified nanoscale zero-valent iron (nZVI) for the remediation of cadmium (Cd)-contaminated soil. In this experiment, citric acid (CA) was used to simulate root exudates, which were then added to water and soil to simulate the pore water and rhizosphere environment. In detail, the experiment in water demonstrated that low concentration of CA facilitated Cd removal by nZVI, while the high concentration achieved the opposite. Among them, CA can promote the adsorption of Cd not only by direct complexation with heavy metal ions, but also by indirect effect to promote the production of iron hydroxyl oxides which has excellent heavy metal adsorption properties. Additionally, the H+ dissociated from CA posed a great influence on Cd removal. The situation in soil was similar to that in water, where low concentrations of CA contributed to the immobilization of Cd by nZVI, while high concentrations promoted the desorption of Cd and the generation of CA–Cd complexes which facilitated the uptake of Cd by plants. As the reaction progressed, the soil pH and cation exchange capacity (CEC) increased, while organic matter (OM) decreased. Meanwhile, the soil microbial community structure and diversity were investigated by high-throughput sequencing after incubation with CA and nZVI. It was found that a high concentration of CA was not conducive to the growth of microorganisms, while CMC had the effect of alleviating the biological toxicity of nZVI.

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Bimetallic FeNi Alloy Nanoparticles Grown on Graphene for Efficient Removal of Congo Red From Aqueous Solution

Zou

Zhu

Yuan

2022

Advanced Sustainable Systems

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Nano zero‐valent iron (nZVI) is an effective material for dye wastewater treatment, but excessive agglomeration and oxidation greatly limit its application. Herein, graphene (GR) supported FeNi bimetallic nanoparticles (FeNi@GR) are prepared by alloying and carrier supported dispersion for efficient removal of azo dyes from water. Not only can it effectively solve the problem of excessive agglomeration and oxidation of nZVI, but also the synergistic effect of bimetallic coordination formation and the excellent electron transfer ability of graphene are beneficial to enhance the reactivity of FeNi@GR. The optimal FeNi@GR is prepared by adjusting the content of GR and the removal of Congo red (CR) by FeNi@GR‐10% reached 625 mg g−1 within 150 min at pH = 7.0. Higher temperature and lower pH favor the removal of CR azo dye. The action mechanisms of FeNi@GR presumably involve the transfer of active hydrogen atoms and the transfer of electrons generated by Fe0 and Ni0. Besides, the saturation magnetization (Ms) of FeNi@GR is 68.15 emu g−1, which has excellent magnetic response performance. This work not only provides a simple and efficient method to stabilize nZVI, but also reveals that using FeNi@GR is a promising approach for the remediation of water pollution.

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Carboxymethyl cellulose stabilized and sulfidated nanoscale zero-valent iron: Characterization and trichloroethene dechlorination

Cited by 85 publications

References 51 publications

Quantifying the efficiency and selectivity of organohalide dechlorination by zerovalent iron

Quantifying the efficiency and selectivity of organohalide dechlorination by zerovalent iron

Remediation of Cd-Contaminated Soil by Modified Nanoscale Zero-Valent Iron: Role of Plant Root Exudates and Inner Mechanisms

Bimetallic FeNi Alloy Nanoparticles Grown on Graphene for Efficient Removal of Congo Red From Aqueous Solution

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