Reductive removal of As(V) and As(III) from aqueous solution by the UV/sulfite process: Recovery of elemental arsenic

Wang, Jianbing; Liu, Jiyong; Peng, Xianjia; He, Mengchang; Hu, Xingyun; Zhao, Jinmin; Zhu, Feng; Yang, Xin; Kong, Lingqian

doi:10.1016/j.watres.2022.118981

Cited by 29 publications

(8 citation statements)

References 58 publications

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“…The studies show that the negligible influence of anions on the reduction processes in pollutant degradation is due to the following reasons: The minor contribution to in the degradation of the target contaminants 25 , The attraction of UV light by anions. Anions prevent UV rays from interacting with oxidizing and reducing agents in reactions, which in turn reduces the formation of active radicals that degrade the target pollutants 48 , 49 , The reaction constants and inhibition potential of inorganic ions) chloride, sulfate, and carbonate) show that they are weak inhibitors of 16 . …”

Section: Resultsmentioning

confidence: 99%

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Photoreduction of atrazine from aqueous solution using sulfite/iodide/UV process, degradation, kinetics and by-products pathway

Vahidi-Kolur,

Yazdanbakhsh,

Hosseini

et al. 2024

Sci Rep

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Due to its widespread use in agriculture, atrazine has entered aquatic environments and thus poses potential risks to public health. Therefore, researchers have done many studies to remove it. Advanced reduction process (ARP) is an emerging technology for degrading organic contaminants from aqueous solutions. This study was aimed at evaluating the degradation of atrazine via sulfite/iodide/UV process. The best performance (96% of atrazine degradation) was observed in the neutral pH at 60 min of reaction time, with atrazine concentration of 10 mg/L and concentration of sulfite and iodide of 1 mM. The kinetic study revealed that the removal of atrazine was matched with the pseudo-first-order model. Results have shown that reduction induced by $${{\text{e}}}_{{\text{aq}}}^{-}$$ e aq - and direct photolysis dominated the degradation of atrazine. The presence of anions ($${{\text{Cl}}}^{-}$$ Cl - ,$${{\text{CO}}}_{3}^{2-}$$ CO 3 2 - and $${{\text{SO}}}_{4}^{2-}$$ SO 4 2 - ) did not have a significant effect on the degradation efficiency. In optimal conditions, COD and TOC removal efficiency were obtained at 32% and 4%, respectively. Atrazine degradation intermediates were generated by de-chlorination, hydroxylation, de-alkylation, and oxidation reactions. Overall, this research illustrated that Sulfite/iodide/UV process could be a promising approach for atrazine removal and similar contaminants from aqueous solutions.

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Section: Resultsmentioning

confidence: 99%

“…The attraction of UV light by anions. Anions prevent UV rays from interacting with oxidizing and reducing agents in reactions, which in turn reduces the formation of active radicals that degrade the target pollutants 48 , 49 ,…”

Section: Resultsmentioning

confidence: 99%

Photoreduction of atrazine from aqueous solution using sulfite/iodide/UV process, degradation, kinetics and by-products pathway

Vahidi-Kolur,

Yazdanbakhsh,

Hosseini

et al. 2024

Sci Rep

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“…Meanwhile, • H radicals are prone to be annihilated by • OH (eq ). Then, As(V) or As(III) may be gradually reduced by e aq – / • H to As(0) and finally to AsH 3 (eqs –). , …”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, • H radicals are prone to be annihilated by • OH (eq ). Then, As(V) or As(III) may be gradually reduced by e aq – / • H to As(0) and finally to AsH 3 (eqs –). , H 2 O + H 2 O → h ν e aq − + normalOH • + H 3 O + H 3 O + + e aq − → normalH • + H 2 O e aq − + HSO 3 − → normalH • + SO 3 2 − normalH • + normalOH • → H 2 …”

Section: Resultsmentioning

confidence: 99%

Photochemical Hydride Generation in Sulfite Medium: Sample Introduction into an Inductively Coupled Plasma Mass Spectrometer for the Determination of Ultratrace Inorganic Arsenic

Chen

et al. 2023

Anal. Chem.

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This Technical Note reports a new UV photochemical hydride generation (PHG) of As(III/V) in a sulfite medium. Combining PHG for sample introduction with sector field inductively coupled plasma mass spectrometry (SF-ICPMS) for detection, we established a novel and ultrasensitive approach for the determination of total inorganic As. Arsine was generated simply by exposing arsenic solutions containing 2 mM of sodium sulfite to UV irradiation for 10 s with 1 mM of sodium formate for sensitivity enhancement. An impressive limit of detection of 0.2 ng/L for As, suitable for the quantitation of inorganic arsenic at ultratrace levels, was readily achieved. Formation of hydrated electrons and hydrogen radicals was experimentally validated, and this may be responsible for the reduction of the high-valent arsenic species. The PHG may also provide a new and useful alternative to conventional hydride generation and photochemical vapor generation for the determination of other trace elements, such as Se(VI) and Te(VI), and by other atomic spectrometric techniques.

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“…From a practical and economical point of view, elemental arsenic (As 0 ) is less toxic and more valuable (approximately $6200 per ton) than As x O y . It is also an important raw material for synthesizing gallium arsenide (GaAs) and nonferrous metal alloys. , Because As 0 is more valuable, catalysts should be designed to convert AsH 3 into it. Many scholars have investigated the transformation of As 3+ or As 5+ to As 0 using strongly reducing catalysts, but deep reduction can produce toxic AsH 3 gas .…”

Section: Introductionmentioning

confidence: 99%

Enhancing AsH₃ Detoxification via Electron-Deficient [Ni^III–OH (μ-O)] in a Nickel-Modified NaY Zeolite: A Pathway toward As⁰ Products

Xie,

Wang,

et al. 2024

Environ. Sci. Technol.

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The transformation of toxic arsine (AsH 3 ) gas into valuable elemental arsenic (As 0 ) from industrial exhaust gases is important for achieving sustainable development goals. Although advanced arsenic removal catalysts can improve the removal efficiency of AsH 3 , toxic arsenic oxides generated during this process have not received adequate attention. In light of this, a novel approach for obtaining stable As 0 products was proposed by performing controlled moderate oxidation. We designed a tailored Ni-based catalyst through an acid etching approach to alter interactions between Ni and NaY. As a result, the 1Ni/NaY-H catalyst yielded an unprecedented proportion of As 0 as the major product (65%), which is superior to those of other reported catalysts that only produced arsenic oxides. Density functional theory calculations clarified that Ni species changed the electronic structure of oxygen atoms, and the formed [Ni III − OH (μ-O)] active centers facilitated the adsorption of AsH 2 *, AsH*, and As* reaction intermediates for As−H bond cleavage, thereby decreasing the direct reactivity of oxygen with the arsenic intermediates. This work presents pioneering insights into inhibiting excessive oxidation during AsH 3 removal, demonstrating potential environmental applications for recovery of As 0 from toxic AsH 3 .

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Reductive removal of As(V) and As(III) from aqueous solution by the UV/sulfite process: Recovery of elemental arsenic

Cited by 29 publications

References 58 publications

Photoreduction of atrazine from aqueous solution using sulfite/iodide/UV process, degradation, kinetics and by-products pathway

Photoreduction of atrazine from aqueous solution using sulfite/iodide/UV process, degradation, kinetics and by-products pathway

Photochemical Hydride Generation in Sulfite Medium: Sample Introduction into an Inductively Coupled Plasma Mass Spectrometer for the Determination of Ultratrace Inorganic Arsenic

Enhancing AsH₃ Detoxification via Electron-Deficient [Ni^III–OH (μ-O)] in a Nickel-Modified NaY Zeolite: A Pathway toward As⁰ Products

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Reductive removal of As(V) and As(III) from aqueous solution by the UV/sulfite process: Recovery of elemental arsenic

Cited by 29 publications

References 58 publications

Photoreduction of atrazine from aqueous solution using sulfite/iodide/UV process, degradation, kinetics and by-products pathway

Photoreduction of atrazine from aqueous solution using sulfite/iodide/UV process, degradation, kinetics and by-products pathway

Photochemical Hydride Generation in Sulfite Medium: Sample Introduction into an Inductively Coupled Plasma Mass Spectrometer for the Determination of Ultratrace Inorganic Arsenic

Enhancing AsH3 Detoxification via Electron-Deficient [NiIII–OH (μ-O)] in a Nickel-Modified NaY Zeolite: A Pathway toward As0 Products

Contact Info

Product

Resources

About

Enhancing AsH₃ Detoxification via Electron-Deficient [Ni^III–OH (μ-O)] in a Nickel-Modified NaY Zeolite: A Pathway toward As⁰ Products