Simultaneous photocatalytic redox removal of chromium(<scp>vi</scp>) and arsenic(<scp>iii</scp>) by hydrothermal carbon-sphere@nano-Fe<sub>3</sub>O<sub>4</sub>

Liu, Feng; Zhang, Weifang; Le, Tao; Hao, Boyuan; Zhang, Jing

doi:10.1039/c8en01362d

Cited by 44 publications

(23 citation statements)

References 47 publications

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“…The Fe 2+ generated in equation 11 would have been an additional source of Fe 2+ for A. ferrooxidans to generate Fe 3+ , which could in turn form additional Fe 3+ precipitates. Rich Fe 2+ could maintain a relatively reducing environment and assist the oxidation of As(III) (Liu et al , 2019).…”

Section: Resultsmentioning

confidence: 99%

“…Recently, nano-sized, zero-valence iron (nZVI) particles and ZVI-biochar have been used for the remediation of As and Cr (Qiao et al , 2017; Vítková et al , 2018; Liu et al , 2019). Baragaño et al (2020) showed that notable results were obtained for nZVI at a dose of 2% (89.5% decrease in As, TCLP test – toxicity characteristic leaching procedure), and no negative effects on soil parameters were detected.…”

Section: Introductionmentioning

confidence: 99%

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In situremediation of arsenic-rich mine tailings using slag zero valence iron

Yue

Chen

Liu

2020

MinMag

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Arsenopyrite (FeAsS) and realgar (As4S4) are two common arsenic minerals that often cause serious environmental issues. Centralised treatment of arsenic-containing tailings can reduce land occupation and save management costs. The current work examined the remediation schemes of tailings from Hunan Province, China, where by different tailings containing arsenopyrite and realgar were blended with exogenous slag zero valence iron (ZVI). Introducing Fe-oxidising bacteria (Acidithiobacillus ferrooxidans) recreates a biologically oxidative environment. All bioleaching experiments were done over three stages, each for 7 days and the solid phase of all tests was characterised by scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy and selective extraction analyses. The results showed that the mixture group reduced arsenic release by 72.9–74.7% compared with the control group. The addition of 0.2 g ZVI clearly decreased arsenic release, and the addition of 4.0 g ZVI led to the lowest arsenic release among all tests. The decrease of arsenic released from the tailings was due to the adsorption and uptake of arsenic by secondary iron-containing minerals and Fe–As(V) secondary mineralisation. The addition of large amounts of ZVI reduced the arsenic detected in the amorphous Fe precipitates. Therefore, a low cost and integrated strategy to reduce arsenic release from tailings is to mix two typical tailings and apply exogenous slag ZVI, which can apply to the in situ remediation of two kinds or more arsenic-containing tailings.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In situremediation of arsenic-rich mine tailings using slag zero valence iron

Yue

Chen

Liu

2020

MinMag

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“…Iron oxide impregnated hydrothermal carbon spheres were tested for the simultaneous redox conversion and removal of Cr(VI) and As(III) from AMD using simulated solar light irradiation (Liu, Zhang, Tao, Hao, & Zhang, 2019). The AMD with Cr(III) and As(V) were readily treated by precipitation as Cr(OH) 3 and FeAsO 4 .…”

Section: Mine Drainage Remediation Technologymentioning

confidence: 99%

Mine drainage: Remediation technology and resource recovery

Viadero

Zhang

et al. 2020

Water Environment Research

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Drainage from current and historic mining operations remains a persistent environmental problem. Numerous research and development efforts were made in 2019 with a goal to minimize the impact of mine drainage on the environment, while other research endeavors addressed the mine drainage issue from a different perspective, where mine drainage was considered a resource for water and valuable products, such as metals, sulfuric acid, and rare earth elements. Thus, this review has two main sections: (a) focusing on research efforts in mine drainage remediation technology, and (b) emphasizing advances in resource recovery from mine drainage. The first section covers traditional and emerging passive and active treatment technologies. The second section summarizes resource recovery efforts using various technologies, such as selective precipitation, membrane process, and biological systems.

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“…Various photocatalyst for the removal of Cr (VI) have been investigated, including active carbon [18], metal oxide nanoparticles [19,20], synthesized polymer beads [21] and agriculture waste [22]. Among these, iron oxide (Fe 3 O 4 ) is one of the most widely studied due to its high efficiency, chemical stability, low cost, and availability [23,24]. However, after photodegradation, it is extremely difficult to separate the catalyst from the solution, which would raise the operational costs [25,26].…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Visible Light Photodegradation of Cr(VI) Using Electrospun MWCNTs-Fe3O4@PES Nanofibers

et al. 2021

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The development of highly efficient photocatalysis has been prepared by two different methods for the photodegradation of Cr(VI) from an aqueous solution under visible light. The electrospun polyethersulfone (PES)/iron oxide (Fe3O4) and multi-wall carbon nanotubes (MWCNTs) composite nanofibers have been prepared using the electrospinning technique. The prepared materials were characterized by SEM and XRD analysis. The result reveals the successful fabrication of the composite nanofiber with uniformly and smooth nanofibers. The effect of numerous parameters were explored to investigate the effects of pH value, contact time, concentration of Cr(VI), and reusability. The MWCNTs-Fe3O4@PES composite nanofibers exhibited excellent photodegradation of Cr(VI) at pH 2 in 80 min. The photocatalysis materials are highly stable without significant reduction of the photocatalytic efficiency of Cr(VI) after five cycles. Therefore, due to its easy separation and reuse without loss of photocatalytic efficiency, the photocatalysis membrane has tremendous potential for the removal of heavy metals from aqueous solutions.

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Simultaneous photocatalytic redox removal of chromium(vi) and arsenic(iii) by hydrothermal carbon-sphere@nano-Fe₃O₄

Abstract: The reduction of Cr(vi) and oxidation of As(iii) were markedly accelerated by employing iron oxide encapsulated in hydrothermal carbon sphere under simulated solar light irradiation.

Cited by 44 publications

References 47 publications

In situremediation of arsenic-rich mine tailings using slag zero valence iron

In situremediation of arsenic-rich mine tailings using slag zero valence iron

Mine drainage: Remediation technology and resource recovery

Highly Efficient Visible Light Photodegradation of Cr(VI) Using Electrospun MWCNTs-Fe3O4@PES Nanofibers

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Simultaneous photocatalytic redox removal of chromium(vi) and arsenic(iii) by hydrothermal carbon-sphere@nano-Fe3O4

Abstract: The reduction of Cr(vi) and oxidation of As(iii) were markedly accelerated by employing iron oxide encapsulated in hydrothermal carbon sphere under simulated solar light irradiation.

Cited by 44 publications

References 47 publications

In situremediation of arsenic-rich mine tailings using slag zero valence iron

In situremediation of arsenic-rich mine tailings using slag zero valence iron

Mine drainage: Remediation technology and resource recovery

Highly Efficient Visible Light Photodegradation of Cr(VI) Using Electrospun MWCNTs-Fe3O4@PES Nanofibers

Contact Info

Product

Resources

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Simultaneous photocatalytic redox removal of chromium(vi) and arsenic(iii) by hydrothermal carbon-sphere@nano-Fe₃O₄