Synthesis of agar-stabilized nanoscale zero-valent iron particles and removal study of hexavalent chromium

Jiao, Chunlei; Cheng, Yue; Fan, Wenjing; Li, J.

doi:10.1007/s13762-014-0524-0

Cited by 32 publications

(8 citation statements)

References 43 publications

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“…The peaks at 1159.26 and 1010.42 cm −1 were assigned to C-O and C-C stretching vibration of C-O-H bending. This observation is similar to that obtained by Jiao et al [27]. So we conclude the surface of fresh nanoparticle is cover by the starch molecules.…”

Section: Characterization Of Metal Nanoparticlesupporting

confidence: 92%

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High nitrate removal by starch‐stabilized Fe⁰ nanoparticles in aqueous solution in a controlled system

Beigy

Rasekh²,

Yazdian

et al. 2017

Engineering in Life Sciences

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This study was conducted to investigate biodenitrification efficiency with starch‐stabilized nano zero valent iron (S‐nZVI) as the additional electron donor in the presence of S2O3 in aqueous solutions, under anaerobic conditions. The main challenge for nZVI application is their tendency to agglomeration, thereby resulting in loss of reactivity that necessitates the use of stabilizers to improve their stability. In this study, S‐nZVI was synthesized by chemical reduction method with starch as a stabilizer. The synthesized nanoparticles were characterized by TEM, XRD, and FTIR. Transmission electron microscopy (TEM) image shows S‐nZVI has a size in the range of 5–27.5 nanometer. Temperature and S‐nZVI concentration were the important factors affecting nitrate removal. Biodenitrification increased at 35°C and 500 mg/L of S‐nZVI, in these conditions, biodenitrification efficiency increased from 40.45 to 78.84%. Experimental results suggested that biodenitrification increased by decreasing initial nitrate concentration. In the bioreactor biodenitrification rate was 94.07% in the presence of S‐nZVI. This study indicated that, Fe2+ could be used as the only electron donor or as the additional electron donor in the presence of S2O3 to increase denitrification efficiency.

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Section: Characterization Of Metal Nanoparticlesupporting

confidence: 92%

“…This observation is similar to that obtained by Jiao et al . . So we conclude the surface of fresh nanoparticle is cover by the starch molecules.…”

Section: Resultsmentioning

confidence: 54%

High nitrate removal by starch‐stabilized Fe⁰ nanoparticles in aqueous solution in a controlled system

Beigy

Rasekh²,

Yazdian

et al. 2017

Engineering in Life Sciences

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“…These compounds are in accordance with the chemical composition of Table 1 . The characteristic (110) diffraction peak of iron at a 2-theta value was 44.8°, indicating the presence of zero-valent Fe in B-nZVI and GO-B-nZVI [ 24 ]. The phenomenon indicates that zero-valent iron was prepared successfully in the experiment.…”

Section: Resultsmentioning

confidence: 99%

Nanoscale Zero-Valent Iron Decorated on Bentonite/Graphene Oxide for Removal of Copper Ions from Aqueous Solution

Shao

Zhou

et al. 2018

Materials

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The removal efficiency of Cu(II) in aqueous solution by bentonite, graphene oxide (GO), and nanoscale iron decorated on bentonite (B-nZVI) and nanoscale iron decorated on bentonite/graphene oxide (GO-B-nZVI) was investigated. The results indicated that GO-B-nZVI had the best removal efficiency in different experimental environments (with time, pH, concentration of copper ions, and temperature). For 16 hours, the removal efficiency of copper ions was 82% in GO-B-nZVI, however, it was 71% in B-nZVI, 26% in bentonite, and 18% in GO. Bentonite, GO, B-nZVI, and GO-B-nZVI showed an increased removal efficiency of copper ions with the increase of pH under a certain pH range. The removal efficiency of copper ions by GO-B-nZVI first increased and then fluctuated slightly with the increase of temperature, while B-nZVI and bentonite increased and GO decreased slightly with the increase of temperature. Lorentz-Transmission Electron Microscope (TEM) images showed the nZVI particles of GO-B-nZVI dispersed evenly with diameters ranging from 10 to 86.93 nm. Scanning electron microscope (SEM) images indicated that the nanoscale iron particles were dispersed evenly on bentonite and GO with no obvious agglomeration. The qe,cal (73.37 mg·g−1 and 83.89 mg·g−1) was closer to the experimental value qe,exp according to the pseudo-second-order kinetic model. The qm of B-nZVI and GO-B-nZVI were 130.7 mg·g−1 and 184.5 mg·g−1 according to the Langmuir model.

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“…The investigation revealed that the removal of As(III) required high degree of surface reactivity to ensure the suitable As(III) adsorption capacity and a sufficient contact between adsorbents-As(III). Nanoscale zero valent iron (NZVI), which contains high surface and high surface heterogeneity, has been reported as a promising adsorbent for capturing As(III)/As(V) from contaminated water [10,11].…”

Section: Introductionmentioning

confidence: 99%

Role of Cu on zero valent bimetallic Cu—Fe in arsenic removal with gas bubbling

Nakseedee

Tanboonchuy

Khemthong

et al. 2017

Env Prog and Sustain Energy

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Arsenic (As) removal by nano bimetallic Cu-Fe synthesized by in-situ (Cu-Fe) IS and impregnation (Cu-Fe) IM techniques was studied. Synthesized Cu-Fe by both techniques provided smaller particles than NZVI particles. (Cu-Fe) IM showed higher efficiency in As removal, compared to (CuFe) IS and pristine NZVI. Batch experiments were performed by varying percent Cu loading (0-30% by wt). As(III) was removed completely by 10 wt % Cu loading on NZVI under an IM technique. It also provided double removal rate compared to pristine NZVI. X-ray absorption near edge structure analysis supported that a mixed phases of Cu 2 O and CuO in (Cu-Fe) IM enhanced As removal toward co-precipitating with iron species about 20% for both As(III) and As(V) removal.

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Synthesis of agar-stabilized nanoscale zero-valent iron particles and removal study of hexavalent chromium

Cited by 32 publications

References 43 publications

High nitrate removal by starch‐stabilized Fe⁰ nanoparticles in aqueous solution in a controlled system

High nitrate removal by starch‐stabilized Fe⁰ nanoparticles in aqueous solution in a controlled system

Nanoscale Zero-Valent Iron Decorated on Bentonite/Graphene Oxide for Removal of Copper Ions from Aqueous Solution

Role of Cu on zero valent bimetallic Cu—Fe in arsenic removal with gas bubbling

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Synthesis of agar-stabilized nanoscale zero-valent iron particles and removal study of hexavalent chromium

Cited by 32 publications

References 43 publications

High nitrate removal by starch‐stabilized Fe0 nanoparticles in aqueous solution in a controlled system

High nitrate removal by starch‐stabilized Fe0 nanoparticles in aqueous solution in a controlled system

Nanoscale Zero-Valent Iron Decorated on Bentonite/Graphene Oxide for Removal of Copper Ions from Aqueous Solution

Role of Cu on zero valent bimetallic Cu—Fe in arsenic removal with gas bubbling

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High nitrate removal by starch‐stabilized Fe⁰ nanoparticles in aqueous solution in a controlled system

High nitrate removal by starch‐stabilized Fe⁰ nanoparticles in aqueous solution in a controlled system