A fabrication strategy for nanosized zero valent iron (nZVI)–polymeric anion exchanger composites with tunable structure for nitrate reduction

Jiang, Zhenmao; Zhang, Shujuan; Pan, Bingcai; Wang, Wenfeng; Wang, Xiaoshu; Lv, Lu; Zhang, Weimin; Zhang, Quanxing

doi:10.1016/j.jhazmat.2012.06.025

Cited by 38 publications

(23 citation statements)

References 26 publications

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“…The resultant composites are spherical with almost equal iron loadings. The hybrids with more uniform ZVI distribution exhibited higher efficiency, faster reduction rate, and higher production selectivity of gaseous nitrogen species [22]. The current study further investigated the aging characteristics and particle reactivity of four D201-ZVIs with different ZVI distributions in the batch arseniteremoval processes.…”

Section: Introductionmentioning

confidence: 90%

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Effect of spatial distribution and aging of ZVI on the reactivity of resin–ZVI composites for arsenite removal

Zhang

Pan

et al. 2014

J Mater Sci

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A zero-valent iron (ZVI)-resin composite (D201-ZVI) has been proven as an effective arsenic removal material. Here, the effect of ZVI distribution and aging on the reactivity of the hybrid composite was investigated by comparing the As(III) removal performances of freshly synthesized and aged D201-ZVI composites. The ZVI distribution and structures of these composites were characterized using X-ray diffraction, X-ray photoelectron spectrometry, and scanning electron microscope equipped with an energy-dispersive X-ray analyzer (SEM-EDX). After aging in aerated water for 96 h, the ZVI distribution in the aged composites did not change significantly, which was confirmed by SEM-EDX. However, the Fe 0 content decreased as the aging time increased. Among the as-prepared composites with variant ZVI distributions, the hybrids with more uniform ZVI distribution exhibited higher removal efficiency and faster reaction rate. Experimental results show that the D201-ZVI gradually lost reactivity with an increase in aging time from 24 to 96 h. The effects of aging time on the speciation of As suggest that the reduced As(III) removal efficiency was attributable to the decrease of the Fe 0 content. Furthermore, the importance of the ZVI distribution is proposed to explain the aging effect.

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Section: Introductionmentioning

confidence: 90%

“…D201-ZVIs with different ZVI distributions have been studied on nitrate reduction [22]. By adjusting the NaBH 4 concentration from 0.9 to 7.2 %, ZVI was deposited on the resin from the anionic FeCl 4 -(the precursor of ZVI).…”

Section: Introductionmentioning

confidence: 99%

Effect of spatial distribution and aging of ZVI on the reactivity of resin–ZVI composites for arsenite removal

Zhang

Pan

et al. 2014

J Mater Sci

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“…Most of the previous studies achieved 100% removal of nitrate using freshly prepared ZVI particles that were used immediately after the synthesis because these particles are unstable in air [18,19], which was limited by purging inert gas into the reaction medium and ZVI storage containers [20][21][22][23]. Only few studies [24,25] were carried out using ZVI supported composites. In one of the studies, an nZVI-polystyrene anion exchange composite showed 80% reduction of nitrate at pH 6.0 [24].…”

Section: Effect Of Initial Ph Value On the Reduction Of Nitratementioning

confidence: 99%

“…Only few studies [24,25] were carried out using ZVI supported composites. In one of the studies, an nZVI-polystyrene anion exchange composite showed 80% reduction of nitrate at pH 6.0 [24]. In another study, nZVI supported in polystyrene-divinylbenzene copolymer showed 88.8% degradation of nitrate at pH 2.0 and 100% degradation at pH 5.0 [25].…”

Section: Effect Of Initial Ph Value On the Reduction Of Nitratementioning

confidence: 99%

Chemical reduction of nitrate by zerovalent iron nanoparticles adsorbed radiation-grafted copolymer matrix

Ratnayake¹,

Ratnayake²,

Schild

et al. 2017

Nukleonika

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Abstract. This research specifi cally focused on the development of a novel methodology to reduce excess nitrate in drinking water utilizing zerovalent iron nanoparticles (nZVI)-stabilized radiation-grafted copolymer matrix. nZVI was synthesized by borohydrate reduction of FeCl 3 and stabilized on acrylic acid (AAc)-grafted non-woven polyethylene/polypropylene (NWPE/PP-g-AAc) copolymer matrix, which was grafted using gamma radiation. The use of nZVI for environmental applications is challenging because of the formation of an oxide layer rapidly in the presence of oxygen. Therefore, radiation-grafted NWPE/PP synthetic fabric was used as the functional carrier to anchor nZVI and enhance its spreading and stability. The chemical reduction of nitrate by nZVI-adsorbed NWPE/PP-g-AAc (nZVI-Ads-NWP) fabric was examined in batch experiments at different pH values. At low pH values, the protective layers on nZVI particles can be readily dissolved, exposing the pure iron particles for effi cient chemical reduction of nitrate. After about 24 h, at pH 3, almost 96% of nitrate was degraded, suggesting that this reduction process is an acid-driven, surface-mediated process. The nZVI-water interface has been characterized by the 1-pK Basic Stern Model (BSM). An Eley-Rideal like mechanism well described the nitrate reduction kinetics. In accordance with green technology, the newly synthesized nZVI-Ads--NWP has great potential for improving nitrate reduction processes required for the drinking water industry.

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“…Fortunately, nanoscale zero-valent iron (NZVI) has been demonstrated to be a promising alternative even under near-neutral and/or neutral conditions due to its large specific surface area and high reactivity [7][8][9]. Nonetheless, this process also faces several critical issues, such as easy aggregation [10], difficult separation/recycling [7], or tedious preparation when supporting NZVI onto other carriers [7,11], thus hindering its field application.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of enhanced nitrate reduction via micro-electrolysis at the powdered zero-valent iron/activated carbon interface

Luo

Song

Liu

et al. 2014

Journal of Colloid and Interface Science

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A fabrication strategy for nanosized zero valent iron (nZVI)–polymeric anion exchanger composites with tunable structure for nitrate reduction

Cited by 38 publications

References 26 publications

Effect of spatial distribution and aging of ZVI on the reactivity of resin–ZVI composites for arsenite removal

Effect of spatial distribution and aging of ZVI on the reactivity of resin–ZVI composites for arsenite removal

Chemical reduction of nitrate by zerovalent iron nanoparticles adsorbed radiation-grafted copolymer matrix

Mechanism of enhanced nitrate reduction via micro-electrolysis at the powdered zero-valent iron/activated carbon interface

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