Simultaneous roxarsone photocatalytic degradation and arsenic adsorption removal by TiO2/FeOOH hybrid

Fu, Wentao; Lu, D. R.; Yao, Hang; Yuan, Shuai; Wang, Wei; Gong, Miao; Hu, Zhenhu

doi:10.1007/s11356-020-08310-5

Cited by 24 publications

(7 citation statements)

References 39 publications

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“…S36,† the quantitative analysis based on the area ratio of the two overlapped peaks showed that As (V) was dominant, accounting for 90% of the inorganic As species that occurred during the photodegradation of ROX, while As (III) was insignificant. The performance of the CrNiCo-P/GCN catalyst was compared with the performance of other catalysts, such as α-FeOOH@GCA, 64 ZnO, 66 Bi 0.5 Fe 0.5 VO 4 /SCN, 68 TiO 2 /FeOOH, 70 and Fe 3 S 4 , 71 that have been reported for photocatalytic degradation of ROX, as shown in Table S10 †. Furthermore, the fate of the catalysts after the photocatalytic experiments was studied by FE-SEM and XPS.…”

Section: Resultsmentioning

confidence: 99%

Development of robust multifunctional CrNiCo-P/GCN catalyst for oxygen evolution reaction, electrochemical sensing, and photodegradation of roxarsone

et al. 2022

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Section: Resultsmentioning

confidence: 99%

Development of robust multifunctional CrNiCo-P/GCN catalyst for oxygen evolution reaction, electrochemical sensing, and photodegradation of roxarsone

et al. 2022

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“…In the past, the organoarsenic compound roxarsone was extensively used as a organoarsenic feed additive for poultry. Although its use has been forbidden in many countries in the world, residues of roxarsone in the environment still pollute waterways and lead to the enrichment of arsenic-tolerant bacteria [ 8 , 9 ]. These relatively benign organic arsenic compounds including roxarsone, however, are largely degraded into more toxic inorganic forms after they are introduced into the environment [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Bifunctional protein ArsRM contributes to arsenite methylation and resistance in Brevundimonas sp. M20

Zong

Chen

et al. 2023

BMC Microbiol

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Background Arsenic (As) with various chemical forms, including inorganic arsenic and organic arsenic, is the most prevalent water and environmental toxin. This metalloid occurs worldwide and many of its forms, especially arsenite [As(III)], cause various diseases including cancer. Organification of arsenite is an effective way for organisms to cope with arsenic toxicity. Microbial communities are vital contributors to the global arsenic biocycle and represent a promising way to reduce arsenite toxicity. Methods Brevundimonas sp. M20 with arsenite and roxarsone resistance was isolated from aquaculture sewage. The arsHRNBC cluster and the metRFHH operon of M20 were identified by sequencing. The gene encoding ArsR/methyltransferase fusion protein, arsRM, was amplified and expressed in Escherichia coli BL21 (DE3), and this strain showed resistance to arsenic in the present of 0.25–6 mM As(III), aresenate, or pentavalent roxarsone. The methylation activity and regulatory action of ArsRM were analyzed using Discovery Studio 2.0, and its functions were confirmed by methyltransferase activity analysis and electrophoretic mobility shift assays. Results The minimum inhibitory concentration of the roxarsone resistant strain Brevundimonas sp. M20 to arsenite was 4.5 mM. A 3,011-bp arsenite resistance ars cluster arsHRNBC and a 5649-bp methionine biosynthesis met operon were found on the 3.315-Mb chromosome. Functional prediction analyses suggested that ArsRM is a difunctional protein with transcriptional regulation and methyltransferase activities. Expression of ArsRM in E. coli increased its arsenite resistance to 1.5 mM. The arsenite methylation activity of ArsRM and its ability to bind to its own gene promoter were confirmed. The As(III)-binding site (ABS) and S-adenosylmethionine-binding motif are responsible for the difunctional characteristic of ArsRM. Conclusions We conclude that ArsRM promotes arsenite methylation and is able to bind to its own promoter region to regulate transcription. This difunctional characteristic directly connects methionine and arsenic metabolism. Our findings contribute important new knowledge about microbial arsenic resistance and detoxification. Future work should further explore how ArsRM regulates the met operon and the ars cluster.

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“…Given the potential for iron oxides to both enhance and suppress TiO 2 photocatalytic oxidation rates, it is essential to characterize the mechanisms by which material coupling influences the photocatalytic oxidation of As(III), to engineer effective treatments using these new composite photocatalyst‐sorbent materials. To date, no previous study has investigated the influence of parasitic absorption, charge transfer across the heterojunction, or changes to the rate law in the photocatalytic oxidation of As(III) using titania‐iron oxide composite photocatalysts [28,42–44] …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…To date, no previous study has investigated the influence of parasitic absorption, charge transfer across the heterojunction, or changes to the rate law in the photocatalytic oxidation of As(III) using titania-iron oxide composite photocatalysts. [28,[42][43][44] We previously developed new adsorption models for TiO 2 / Fe 2 O 3 composites, showing how the monolayer adsorption of As(V) onto TiO 2 /Fe 2 O 3 obeys component additivity, i. e. the reaction proceeds as adsorption onto non-interacting TiO 2 and Fe 2 O 3 surface components, unaffected when TiO 2 and Fe 2 O 3 are coupled into a composite structure. [45] In contrast, As(III) adsorption is not component additive when there are differences between the morphology of (i) the TiO 2 /Fe 2 O 3 composite and (ii) the single-component TiO 2 and Fe 2 O 3 reference samples, since surface morphology influences the extent of multilayer As(III) adsorption.…”

Section: Introductionmentioning

confidence: 99%

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Parasitic Light Absorption, Rate Laws and Heterojunctions in the Photocatalytic Oxidation of Arsenic(III) Using Composite TiO₂/Fe₂O₃

Bullen

Heiba

Kafizas

et al. 2022

Chemistry A European J

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Composite photocatalyst-adsorbents such as TiO 2 / Fe 2 O 3 are promising materials for the one-step treatment of arsenite contaminated water. However, no previous study has investigated how coupling TiO 2 with Fe 2 O 3 influences the photocatalytic oxidation of arsenic(III). Herein, we develop new hybrid experiment/modelling approaches to study light absorption, charge carrier behaviour and changes in the rate law of the TiO 2 /Fe 2 O 3 system, using UV-Vis spectroscopy, transient absorption spectroscopy (TAS), and kinetic analysis. Whilst coupling TiO 2 with Fe 2 O 3 improves total arsenic removal by adsorption, oxidation rates significantly decrease (up to a factor of 60), primarily due to the parasitic absorption of light by Fe 2 O 3 (88 % of photons at 368 nm) and secondly due to changes in the rate law from disguised zero-order kinetics to first-order kinetics. Charge transfer across this TiO 2 -Fe 2 O 3 heterojunction is not observed. Our study demonstrates the first application of a multi-adsorbate surface complexation model (SCM) towards describing As(III) oxidation kinetics which, unlike Langmuir-Hinshelwood kinetics, includes the competitive adsorption of As(V). We further highlight the importance of parasitic light absorption and catalyst fouling when designing heterogeneous photocatalysts for As(III) remediation.

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Simultaneous roxarsone photocatalytic degradation and arsenic adsorption removal by TiO2/FeOOH hybrid

Cited by 24 publications

References 39 publications

Development of robust multifunctional CrNiCo-P/GCN catalyst for oxygen evolution reaction, electrochemical sensing, and photodegradation of roxarsone

Development of robust multifunctional CrNiCo-P/GCN catalyst for oxygen evolution reaction, electrochemical sensing, and photodegradation of roxarsone

Bifunctional protein ArsRM contributes to arsenite methylation and resistance in Brevundimonas sp. M20

Parasitic Light Absorption, Rate Laws and Heterojunctions in the Photocatalytic Oxidation of Arsenic(III) Using Composite TiO₂/Fe₂O₃

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Simultaneous roxarsone photocatalytic degradation and arsenic adsorption removal by TiO2/FeOOH hybrid

Cited by 24 publications

References 39 publications

Development of robust multifunctional CrNiCo-P/GCN catalyst for oxygen evolution reaction, electrochemical sensing, and photodegradation of roxarsone

Development of robust multifunctional CrNiCo-P/GCN catalyst for oxygen evolution reaction, electrochemical sensing, and photodegradation of roxarsone

Bifunctional protein ArsRM contributes to arsenite methylation and resistance in Brevundimonas sp. M20

Parasitic Light Absorption, Rate Laws and Heterojunctions in the Photocatalytic Oxidation of Arsenic(III) Using Composite TiO2/Fe2O3

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Parasitic Light Absorption, Rate Laws and Heterojunctions in the Photocatalytic Oxidation of Arsenic(III) Using Composite TiO₂/Fe₂O₃