Effect of anions and humic acid on the performance of nanoscale zero-valent iron particles coated with polyacrylic acid

Kim, Hong-Seok; Ahn, Jaehun; Kim, Cheolyong; Lee, Seockheon; Hwang, Inseong

doi:10.1016/j.chemosphere.2014.04.047

Cited by 69 publications

(25 citation statements)

References 40 publications

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“…Addition of HA shows a~2 % reduction in the removal efficiency regardless of concentration. The TCE degradation efficiency by ZVI-rGO is much better than the case of adding ferrous ions directly (Kim et al 2014).…”

Section: Effect Of Solution Matrix On Tce Degradationmentioning

confidence: 87%

“…The natural organic materials (NOMs) comprising the various functional groups such as hydroxyls, amines, carboxyl acids, and phenolic could show interactions towards the surface of nZVIrGO, thus potentially affect its reactivity. Humic acid (HA) comprises of almost 50 % of NOMs (Kim et al 2014;Roshani and Karpel Vel Leitner 2011). The effects of HA at 1, 5, and 10 mg/L concentrations on the degradation of TCE are shown in Fig.…”

Section: Effect Of Solution Matrix On Tce Degradationmentioning

confidence: 99%

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Efficient degradation of trichloroethylene in water using persulfate activated by reduced graphene oxide-iron nanocomposite

Ahmad

et al. 2015

Environ Sci Pollut Res

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Graphene oxide (GO) and nano-sized zero-valent iron-reduced graphene oxide (nZVI-rGO) composite were prepared. The GO and nZVI-rGO composite were characterized by transmission electron microscopy (TEM), Fourier transform infrared (FTIR), energy-dispersive spectroscopy (EDS), and Raman spectroscopy. The size of nZVI was about 6 nm as observed by TEM. The system of nZVI-rGO and persulfate (PS) was used for the degradation of trichloroethylene (TCE) in water, and showed 26.5% more efficiency as compared to nZVI/PS system. The different parameters were studied to determine the efficiency of nZVI-rGO to activate the PS system for the TCE degradation. By increasing the PS amount, TCE removal was also improved while no obvious effect was observed by varying the catalyst loading. Degradation was decreased as the TCE initial concentration was increased from 20 to 100 mg/L. Moreover, when initial solution pH was increased, efficiency deteriorated to 80%. Bicarbonate showed more negative effect on TCE removal among the solution matrix. To better understand the effects of radical species in the system, the scavenger tests were performed. The •SO4(-) and •O2(-) were predominant species responsible for TCE removal. The nZVI-rGO-activated PS process shows potential applications in remediation of highly toxic organic contaminants such as TCE present in the groundwater. Graphical abstract Persulfate activated by reduced graphene oxide and nano-sized zero-valent iron composite can be used for efficient degradation of trichloroethylene (TCE) in water.

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Section: Effect Of Solution Matrix On Tce Degradationmentioning

confidence: 87%

Section: Effect Of Solution Matrix On Tce Degradationmentioning

confidence: 99%

Efficient degradation of trichloroethylene in water using persulfate activated by reduced graphene oxide-iron nanocomposite

Ahmad

et al. 2015

Environ Sci Pollut Res

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“…This polyacrylic acid (PAA)-modified nanoparticles have been commercially introduced and successfully used for the remediation of contaminated soil and groundwater in Europe (Mueller and Nowack, 2010). Surface modification with PAA stabilizes the nZVI particles by forming a negatively charged surface and enhances its mobility in the subsurface environment (Kim et al, 2014). According to the manufacturer, the NANOFER 25S comprised 70-90 % zero iron and 10-30 % iron oxides at the time of production.…”

Section: Commercial Nanoparticlesmentioning

confidence: 99%

Three Functional Biomarkers for Monitoring the Nanoscale Zero-Valent Iron (nZVI)-Induced Molecular Signature on Soil Organisms

Fajardo

Costa

Nande

et al. 2016

Water Air Soil Pollut

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Currently, there are increasing efforts to utilize nanoremediation as an environmental technology for cleaning up polluted environments using nanoscale zero-valent iron (nZVI); however, concerns exist regarding the long-term environmental impact of this strategy. In this study, an innovative methodology for evaluating nZVI impact on soil bacteria is utilized, based on transcriptional analysis of three novel biomakers: tnaA, sodB and trx genes. At the same time, classical toxicological bioassays with the nematode Caenorhabditis elegans were performed. Microcosms treated with 1, 5 and 10 % w/w of nZVI were set up using a commercial standard soil and incubated for 21 days. The tnaA gene, involved in indole production, was significantly upregulated at all assessed nZVI concentrations, suggesting that bacterial cells used this molecule to inform the rest of the community about the changes produced upon nZVI soil treatment. The higher the exposure time, the lower nZVI concentration needed to detect these changes. Consequently, soil bacteria activate a cellular adaptive response to cope with the nZVIinduced oxidative stress, increasing the expression of genes encoding key reactive oxygen species (ROS)-scavenging enzymes; in fact, an upregulation of the sodB and katB genes was recorded upon nZVI exposure. On the contrary, C. elegans survival and growth endpoints were not affected at any nZVI concentration whereas the exposure time significantly increased nematode growth in the soil. Therefore, despite the lack of toxicity revealed by the classical conducted tests, the transcriptional analyses demonstrated the usefulness of combining the set of proposed biomarkers for early detection and monitoring the impact of nZVI on soil bacteria after environmentally important periods of exposure.

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“…Therefore, studying the net effect of DOM on TCE degradation kinetics is necessary in our future work. Some common anions such as NO À 3 , HCO À 3 , SO 2À 4 , and CrO 2À 4 may affect the degradation of TCE in an aqueous solution [12,36,37]. Chen et al [12] studied the effect of various anions (NO À 3 , Cl − , HCO À 3 , and SO 2À 4 ) at 20 mM concentrations on the degradation kinetics of TCE using stabilized zero-valent iron nanoparticles with an Na-acrylic copolymer (ac-nZVI).…”

Section: Effect Of Solution Matrix On Tce Degradationmentioning

confidence: 99%

Effect of operating parameters on trichloroethylene degradation by extended release of nanoscale zero-valent iron

Chen

Hsia

et al. 2016

Desalination and Water Treatment

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A B S T R A C TThis study investigated the effects of various operating parameters on the efficiency and kinetics of trichloroethylene (TCE) degradation by commercial, polyvinyl alcohol-co-vinylacetate-co-itaconic acid (PV3A) stabilized nanoscale zero-valent iron (PV3A-nZVI). The results showed that TCE degradation was a pseudo-first-order reaction. The degradation efficiency and the apparent rate constant of TCE increased with the increasing PV3A-nZVI dosage and decreased with the increasing initial TCE concentration and pH. In addition, the effect of the solution matrix was evaluated. The results suggested that increasing the seawater ratio in the solution suppressed TCE degradation. The apparent rate constants of TCE decreased from 2.79 × 10 −2 to 9.10 × 10 −3 min −1 , and the seawater ratio increased from zero to 100% at 5 g/L PV3A-nZVI and 10 mg/L TCE. Moreover, an investigation of TCE degradation products confirmed that reductive dechlorination through the successive loss of chloride ions is the main pathway of TCE degradation, and ethene is the predominant byproduct during TCE dechlorination. Notably, nearly 100% TCE (10 g/L) removal was achieved with 5 g/L PV3A-nZVI in pure water and seawater within 90 and 120 min, respectively. Hence, PV3A-nZVI is a promising technology for remediating surface water, groundwater, and seawater matrices contaminated with TCE.

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Effect of anions and humic acid on the performance of nanoscale zero-valent iron particles coated with polyacrylic acid

Cited by 69 publications

References 40 publications

Efficient degradation of trichloroethylene in water using persulfate activated by reduced graphene oxide-iron nanocomposite

Efficient degradation of trichloroethylene in water using persulfate activated by reduced graphene oxide-iron nanocomposite

Three Functional Biomarkers for Monitoring the Nanoscale Zero-Valent Iron (nZVI)-Induced Molecular Signature on Soil Organisms

Effect of operating parameters on trichloroethylene degradation by extended release of nanoscale zero-valent iron

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