Enhanced removal of aqueous Cr(VI) by a green synthesized nanoscale zero-valent iron supported on oak wood biochar

Zhang, Yuting; Jiao, Xin-qian; Liu, Na; Lv, Jing; Yang, Yadong

doi:10.1016/j.chemosphere.2019.125542

Cited by 151 publications

(38 citation statements)

References 39 publications

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“…From an estimated 2 mg•L −1 of both contaminants at pH 6.5, 0.2 g•L −1 of the nanocomposite was able to reduce the concentration of Cd 2+ by more than 95% and of As 3+ by 100% in 30 min. Biochar from oakwood was also reported by Yang et al [171] for the synthesis of nZVIs (size range, 90-200 nm) in the presence of tea phenols. The resulting composite was observed to remove close to 99% of a 50 mg•L −1 Cr(VI) solution.…”

Section: Biochar/magnetic Nanocompositesmentioning

confidence: 59%

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Govan

2020

Magnetochemistry

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Water resources are of extreme importance for both human society and the environment. However, human activity has increasingly resulted in the contamination of these resources with a wide range of materials that can prevent their use. Nanomaterials provide a possible means to reduce this contamination, but their removal from water after use may be difficult. The addition of a magnetic character to nanomaterials makes their retrieval after use much easier. The following review comprises a short survey of the most recent reports in this field. It comprises five sections, an introduction into the theme, reports on single magnetic nanoparticles, magnetic nanocomposites containing two of more nanomaterials, magnetic nanocomposites containing material of a biologic origin and finally, observations about the reported research with a view to future developments. This review should provide a snapshot of developments in what is a vibrant and fast-moving area of research.

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Section: Biochar/magnetic Nanocompositesmentioning

confidence: 59%

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Govan

2020

Magnetochemistry

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“…The EDS results showed that after Cr(VI) removal, despite the nearly constant Fe and Sn loading in both samples, oxygen displayed a meaningful rise from 17.23% to 24.39% along with the appearance of Cr among the elements. The increase in O and Cr content suggested the formation and deposition of Cr(III) hydroxides precipitates on the Talc-nZVI/6Sn surface 32,33 .…”

Section: Characterizationsmentioning

confidence: 99%

“…With increasing Cr(VI) concentration from 60 to 120 mg/L, the pseudo-second-order rate constant k2 decreased in general from 0.317 to 0.080 (g/mg min). The results revealed that chemisorption was the rate-limiting step in Cr(VI) removal, and chemisorptive bonds, including sharing or exchanging electrons between Cr(VI) and Talc-nZVI/6Sn were involved 32,48 . The result is consistent with the FTIR and XRD findings.…”

Section: Aging Study and Reusability Of Talc-nzvi/snmentioning

confidence: 99%

“…4(b). XRD pattern of talc, which has been used as supporting material mainly included major peaks at 2θ values of 18°, 28°, 34°, 47°, and 51° for talc and 29.5° for CaMg(CO3)2/dolomite 32 . The synthesized Talc-nZVI/6Sn XRD pattern composed of the weakened characteristic peaks of talc and quartz and also newly formed peaks of Fe 0 at 2θ of 44.9° and Sn 0 at 2θ of 30°, 32°, 43.9° and 44.9°.…”

Section: Characterizationsmentioning

confidence: 99%

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Preparation and Characterization of Nano-galvanic Bimetallic Fe/Sn Nanoparticles Deposited on Talc and its Enhanced Performance in Cr(VI) Removal

Bayat

Nasernejad

Falamaki

2021

Preprint

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In this study, talc-supported nano-galvanic nZVI/Sn bimetallic particles was successfully synthesized and utilized for Cr(VI) remediation. Talc-nZVI/Sn nanoparticles were characterized by SEM, EDS, FTIR, XRD, zeta potential, and BET analysis. The findings verified the uniform dispersion of nZVI/Sn nanoparticles on talc surface. The formation of numerous nano-galvanic cells between nZVI core and Sn shell enhanced the potential of bimetallic particles in Cr(VI) mitigation. Batch experiments were carried out to investigate optimum conditions and total Cr(VI) removal was achieved in 20 minutes using Sn/Fe mass ratio of 6/1, the adsorbent dosage of 2 g/L, initial Cr(VI) concentration of 80 mg/L, at the acidic environment (pH=5) and temperature of 303 K. Besides, co-existing of metallic cations turned out to facilitate the electron transfer from the nano-galvanic couple of NZVI/Sn and suggested the revolution of bimetallic particles to trimetallic composites. The aging study of the nanocomposite confirmed its constant high activity during 60 days. The removal reaction was well described by the pseudo-second-order kinetic and the Langmuir isotherm models. Overall, due to the synergistic galvanic cell effect of nZVI/Sn nanoparticles and full coverage of active sites by Sn layer, Talc-nZVI/6Sn was utilized as a promising nanocomposite for fast and highly efficient Cr(VI) elimination.

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“…( 2)where C0 (mg/L) is the initial concentration of the adsorbate, Ce (mg/L) is the equilibrium concentration of the adsorbate, V (L) is the solution volume, and m (g) is the adsorbent weight, as reported in the literature (Chen et al 2020;Zhang et al 2020). Experiments for the simultaneous removal of MO and Cr(VI) by the PEI-CCM were conducted at 35 °C, and the pH value of the binary adsorbate solution was set at 5.7.…”

Section: Adsorption Experimentsmentioning

confidence: 99%

Simultaneous removal of methyl orange and Cr(VI) using polyethyleneimine-modified corncob-derived carbon material

Liu

Wang

Zhou

et al. 2020

BioRes

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Polyethyleneimine (PEI) modified corncob-derived carbon material (CCM) was prepared by the simple wet-impregnation technique. Field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), Fourier-transform infrared spectroscopy (FT-IR), and nitrogen isothermal adsorption/desorption measurements were used to compare the structural differences between the CCM and the PEI-modified CCM (PEI-CCM). In the single-pollutant removal experiment, the PEI-CCM showed high adsorption capacities for methyl orange (MO) and Cr(VI). However, the CCM only showed high adsorption capacity for MO. Moreover, the PEI-CCM exhibited high removal efficiencies in the simultaneous removal of MO and Cr(VI), with final removal efficiencies of 100% and 95%, respectively. The reusability experiment of PEI-CCM indicated that, after four recycles, PEI-CCM maintained high performance with the removal efficiency of MO and Cr(VI) decreased less than 3% and 16%, respectively. The prepared PEI-CCM could be a high-performance adsorbent for the simultaneous removal of MO and Cr(VI) from water containing multiple pollutants.

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Enhanced removal of aqueous Cr(VI) by a green synthesized nanoscale zero-valent iron supported on oak wood biochar

Cited by 151 publications

References 39 publications

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Preparation and Characterization of Nano-galvanic Bimetallic Fe/Sn Nanoparticles Deposited on Talc and its Enhanced Performance in Cr(VI) Removal

Simultaneous removal of methyl orange and Cr(VI) using polyethyleneimine-modified corncob-derived carbon material

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