Valorization of aluminum scrap via an acid-washing treatment for reductive removal of toxic bromate from water

Lin, Kun‐Yi Andrew; Lin, Jiang‐Jen; Lien, Hsing-Lung

doi:10.1016/j.chemosphere.2017.01.040

Cited by 36 publications

(8 citation statements)

References 23 publications

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“…For the inuencing factors of bromate reduction (direct reduction by metal and light-assisted reduction), many studies have been carried out on bromate concentration, reductant/catalyst concentration, hydrogen ion (pH value) and other anions/ cations. [39][40][41][42] However, given the particular bromate reduction system by bismuth, two typical and crucial inuencing factors were chosen for discussion in this paper. The rst is the residual dissolved oxygen.…”

Section: The Inuence Of Dissolved Oxygen and The Sustainability Of Bmentioning

confidence: 99%

A novel zero valent metal bismuth for bromate removal: direct and ultraviolet enhanced reduction

2020

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Section: The Inuence Of Dissolved Oxygen and The Sustainability Of Bmentioning

confidence: 99%

A novel zero valent metal bismuth for bromate removal: direct and ultraviolet enhanced reduction

2020

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“…12 Moreover, ZVAl is the one possessing amphoteric chemistry, and it can be dissolved in both acidic and alkaline liquors (pH ≤ 4 or pH ≥ 9). 4,13,14 Therefore, ZVAl can trigger reductive reactions under strong alkaline or acidic conditions.…”

Section: ■ Introductionmentioning

confidence: 99%

Highly Selective Reduction of Nitrate by Zero-Valent Aluminum (ZVAI) Ball-Milled Materials at Circumneutral pH: Important Role of Microgalvanic Cells for Depassivation of ZVAl and N₂-Selectivity

Mao

Chen

et al. 2023

Environ. Sci. Technol.

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The passivation of zero-valent aluminum (ZVAl) limits its application in environmental remediation. Herein, a ternary composite material Al–Fe–AC is synthesized via a ball-milling treatment on a mixture of Al0, Fe0, and activated carbon (AC) powders. The results show that the as-prepared micronsized Al–Fe–AC powder could achieve highly efficient nitrate removal and a nitrogen (N2)-selectivity of >75%. The mechanism study reveals that, in the initial stage, numerous Al//AC and Fe//AC microgalvanic cells in the Al–Fe–AC material could lead to a local alkaline environment in the vicinity of the AC cathodes. The local alkalinity depassivated the Al0 component and enabled its continuous dissolution in the subsequent second stage of reaction. The functioning of the AC cathode of the Al//AC microgalvanic cell is revealed as the primary reason accounting for the highly selective reduction of nitrate. The investigation on the mass ratio of raw materials manifested that an Al/Fe/AC mass ratio of 1:1:5 or 1:3:5 was preferable. The test in simulated groundwater suggested that the as-prepared Al–Fe–AC powder could be injected into aquifers to achieve a highly selective reduction of nitrate to nitrogen. This study provides a feasible method to develop high-performance ZVAl-based remedial materials that could work in a wider pH range.

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“…Contaminant reduction by Al would typically involve transport of contaminants onto the surface of Al, and surficial reactions between contaminants and Al surface (Chiu et al, 2018; Lin, Lin, & Li, 2017; Lin, Lin, & Lien, 2017; Lin, Lin, & Yang, 2017). Therefore, bromate reduction by Al should be also profoundly influenced and even manipulated by external driving forces to alter transport, and surficial reactions of bromate on Al surface, whereas the inherent passivation oxide layer might form, and hinder reactions (Zhou et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, such catalytic hydrogenation processes would require continuous consumption of H 2 gas and borohydrides, especially in view of low solubility of H 2 gas in water as well as high cost of H 2 gas/borohydrides. Therefore, an alternative strategy has been considered to utilize metals (zero‐valent metals particularly) for donating electrons onto bromate to reduce it to bromide (Chiu et al, 2019; Lin & Lin, 2017; Lin, Lin, & Lien, 2017; Lin, Lin, & Lin, 2017; Lin, Lin, & Yang, 2017; Lu et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Ultrasound process‐enhanced removal of the toxic disinfection by‐product bromate from water by aluminum: A comparative study

Chen

Park

Kwon

et al. 2022

Water Environment Research

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As bromate removal and reduction can be also achieved using metals, aluminum (Al) appears as the most promising one for reduction of bromate because Al is abundant element and exhibits a high reduction power. Reactions between bromate and Al shall be even enhanced through ultrasound (US) process because US can facilitate mass transfer on liquid/solid interfaces and clean surfaces via generating microscale turbulence to facilitate reactions. Therefore, the aim of this study is for the first time to investigate the effect of US on bromate removal by Al metal. Specifically, Al particle would be treated by HCl to afford HCl‐treated Al (HCTAL), which is capable of removing bromate and even reducing it to bromide. Such a mechanism is also validated by density function theory calculation through determining adsorption energy as −152.8 kJ/mole, and oxygen atoms of bromate would be extracted and reacted with Al atoms, releasing bromide ion. US not only facilitated bromate removal by further increasing removal capacity under the acidic condition but also suppressed the inhibitive effect from basicity at relatively high pH. The spent HCTAL could still remove bromate and convert it to bromide after regeneration. These features indicate that US considerably enhances bromate removal by Al. Practitioner points Bromate removed by Al is elucidated by DFT calculation with Eabsorption = −152.8 kJ/mole. Oxygen atoms of bromate are extracted and reacted with Al atoms, releasing bromide ion. A higher power of ultrasound would substantially enhance bromate removal efficiency. Ultrasound also suppresses the inhibitive effect from basicity at relatively high pH. With ultrasound, the interference of co‐existing anions on bromate removal is lessened.

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Valorization of aluminum scrap via an acid-washing treatment for reductive removal of toxic bromate from water

Cited by 36 publications

References 23 publications

A novel zero valent metal bismuth for bromate removal: direct and ultraviolet enhanced reduction

A novel zero valent metal bismuth for bromate removal: direct and ultraviolet enhanced reduction

Highly Selective Reduction of Nitrate by Zero-Valent Aluminum (ZVAI) Ball-Milled Materials at Circumneutral pH: Important Role of Microgalvanic Cells for Depassivation of ZVAl and N₂-Selectivity

Ultrasound process‐enhanced removal of the toxic disinfection by‐product bromate from water by aluminum: A comparative study

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Valorization of aluminum scrap via an acid-washing treatment for reductive removal of toxic bromate from water

Cited by 36 publications

References 23 publications

A novel zero valent metal bismuth for bromate removal: direct and ultraviolet enhanced reduction

A novel zero valent metal bismuth for bromate removal: direct and ultraviolet enhanced reduction

Highly Selective Reduction of Nitrate by Zero-Valent Aluminum (ZVAI) Ball-Milled Materials at Circumneutral pH: Important Role of Microgalvanic Cells for Depassivation of ZVAl and N2-Selectivity

Ultrasound process‐enhanced removal of the toxic disinfection by‐product bromate from water by aluminum: A comparative study

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Highly Selective Reduction of Nitrate by Zero-Valent Aluminum (ZVAI) Ball-Milled Materials at Circumneutral pH: Important Role of Microgalvanic Cells for Depassivation of ZVAl and N₂-Selectivity