Multilayered TNAs/SnO2/PPy/β-PbO2 anode achieving boosted electrocatalytic oxidation of As(III)

Ji, Wenlan; Xiong, Yuanjie; Wang, Yuan; Zhang, Tian C.; Yuan, Shaojun

doi:10.1016/j.jhazmat.2022.128449

Cited by 36 publications

(6 citation statements)

References 65 publications

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“…Figure a,b shows the CV and LSV curves of different electrodes, respectively. The Ti/TiO 2 -NTs/SnO 2 -Sb 2 O 4 -La electrode has a larger closed area of the CV curve than the other three electrodes (Figure a), indicating that it has more catalytic active sites . At low potential, the Ti/TiO 2 -NTs/SnO 2 -Sb 2 O 4 -La electrode has a stronger current response (Figure b).…”

Section: Resultsmentioning

confidence: 99%

Preparation of Ti/SnO₂-Sb₂O₄-La Electrode with TiO₂ Nanotubes Intermediate Layer and the Electrochemical Oxidation Performance of Rhodamine B

He,

Zhong,

et al. 2024

Langmuir

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A La-doped Ti/SnO 2 -Sb 2 O 4 electrode with TiO 2 -NTs intermediate layer (Ti/TiO 2 -NTs/SnO 2 -Sb 2 O 4 -La) was created via the electrodeposition technique. The physicochemical and electrochemical properties of the electrode were analyzed through FESEM, XRD, XPS, CV, and LSV electrochemical tests. The results showed that TiO 2 -NTs were tightly packed on the surface of Ti substrate, thus improving the binding force of the SnO 2 -Sb 2 O 4 -La coating, offering greater specific surface area, more active spots, higher current response, and longer lifespan for the degradation of rhodamine B. The lifespan of the Ti/TiO 2 -NTs/ SnO 2 -Sb 2 O 4 -La electrode reached 200 min (1000 mA cm −2 , 1 M H 2 SO 4 ), while the actual service life was up to 3699 h. Under the conditions of initial pH 3.0, Na 2 SO 4 concentration of 0.1 M, current density of 30 mA cm −2 , and initial rhodamine B concentration of 20 mg L −1 , the color and TOC removal rate of rhodamine B reached 100% and 86.13% within 15 and 30 min, respectively. Rhodamine B was decomposed into acids, esters, and other molecular compounds under the action of •OH and SO 4•− free radicals and electrocatalysis, and finally completely mineralized into CO 2 and H 2 O. It is anticipated that this work will yield a novel research concept for producing DSA electrodes with superior catalytic efficacy and elevated stability.

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Section: Resultsmentioning

confidence: 99%

Preparation of Ti/SnO₂-Sb₂O₄-La Electrode with TiO₂ Nanotubes Intermediate Layer and the Electrochemical Oxidation Performance of Rhodamine B

He,

Zhong,

et al. 2024

Langmuir

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“…The content of chemisorbed oxygen was determined to be 28%, which was due to the cover of PPy on the surface of Fe 2 O 3 . Figure S2 displays the high-resolution N 1s spectrum, and three deconvoluted peaks are observed at 397.7, 399.8, and 402.1 eV, which are ascribed to the Pyridinic-N, Pyrrolic-N, and nitrogen oxide, respectively [ 40 , 41 , 42 ]. This further indicates the successful formation of PPy on the surface of Fe 2 O 3 .…”

Section: Resultsmentioning

confidence: 99%

Polypyrrole-Coated Low-Crystallinity Iron Oxide Grown on Carbon Cloth Enabling Enhanced Electrochemical Supercapacitor Performance

Pei

et al. 2023

Molecules

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It is highly attractive to design pseudocapacitive metal oxides as anodes for supercapacitors (SCs). However, as they have poor conductivity and lack active sites, they generally exhibit an unsatisfied capacitance under high current density. Herein, polypyrrole-coated low-crystallinity Fe2O3 supported on carbon cloth (D-Fe2O3@PPy/CC) was prepared by chemical reduction and electrodeposition methods. The low-crystallinity Fe2O3 nanorod achieved using a NaBH4 treatment offered more active sites and enhanced the Faradaic reaction in surface or near-surface regions. The construction of a PPy layer gave more charge storage at the Fe2O3/PPy interface, favoring the limitation of the volume effect derived from Na+ transfer in the bulk phase. Consequently, D-Fe2O3@PPy/CC displayed enhanced capacitance and stability. In 1 M Na2SO4, it showed a specific capacitance of 615 mF cm−2 (640 F g−1) at 1 mA cm−2 and still retained 79.3% of its initial capacitance at 10 mA cm−2 after 5000 cycles. The design of low-crystallinity metal oxides and polymer nanocomposites is expected to be widely applicable for the development of state-of-the-art electrodes, thus opening new avenues for energy storage.

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“…Photocatalytic oxidation provides another option, involving indirect oxidation using hydroxyl radicals (·OH) and superoxide radicals (·O 2 – ), or direct oxidation through photogenerated holes. , Alternatively, electrocatalytic oxidation is a notable and straightforward technology that efficiently converts As(III) to As(V) under ambient conditions. − Electrocatalytic oxidation of As(III) to As(V) occurs when a positive voltage is applied to the anode, leading to the direct conversion of adsorbed As(III) to As(V) . Additionally, ·OH generated from the reaction between the anode and water indirectly facilitates the conversion process. , Although these oxidation methods effectively transform As(III) to As(V), the resultant As(V) still maintains its toxicity, which requires further separation from water, typically through adsorption processes. , Therefore, it is desirable to develop an alternative and sustainable strategy for arsenic removal from water, mitigating its harmful impact and enabling arsenic recovery.…”

Section: Introductionmentioning

confidence: 99%

Direct Electrocatalytic Reduction of As(III) on CuSn Alloy Electrode: A Green and Sustainable Strategy to Recover Elemental Arsenic from Arsenic Wastewater

Zheng,

Li,

et al. 2024

Ind. Eng. Chem. Res.

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Arsenic contamination in groundwater and industrial wastewater poses a significant threat to human health and the ecosystem. Electrochemical reduction of highly mobile As(III) species into less toxic elemental arsenic (As(0)) has emerged as a promising method to effectively recover arsenic from water. In this study, a novel CuSn alloy nanowire array-modified copper foam (CuSn NAs/CF) electrode was fabricated for the direct electrochemical reduction of As(III) to As(0). The electrocatalytic reduction of As(III) was systematically investigated under various reaction conditions, including current densities, solution pH, electrolytes, and initial As(III) concentrations. The CuSn NAs/CF electrode was proven to effectively suppress the hydrogen evolution reaction and greatly enhance the electrochemical reduction of As(III). The recovery yield of As(0) on the CuSn NAs/CF electrode reached 3.67 mg/cm 2 at 90 min of electrolysis in a 0.1 M Na 2 SO 4 at pH 11, which was 2.75 times higher than that of the Cu NAs-modified electrode. Furthermore, the as-prepared electrode also demonstrated excellent electrochemical stability and a longer service life, maintaining a recovery yield of As(0) at 2.62 mg/cm 2 even after 6 cycles. The reduction reaction mechanism of As(III) was ascribed to the synergistic effect of direct electrolysis and hydrogen radicals (•H) formation, as revealed by ESR and radical scavenger experimental results. This study not only provides convincing evidence for the direct electrochemical conversion of As(III) to As(0) on an innovative CuSn alloy electrode, but also offers a promising strategy to recover and reuse waste arsenic resources. This contributes to a sustainable and environmentally friendly approach to arsenic-containing wastewater treatment.

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Multilayered TNAs/SnO2/PPy/β-PbO2 anode achieving boosted electrocatalytic oxidation of As(III)

Cited by 36 publications

References 65 publications

Preparation of Ti/SnO₂-Sb₂O₄-La Electrode with TiO₂ Nanotubes Intermediate Layer and the Electrochemical Oxidation Performance of Rhodamine B

Preparation of Ti/SnO₂-Sb₂O₄-La Electrode with TiO₂ Nanotubes Intermediate Layer and the Electrochemical Oxidation Performance of Rhodamine B

Polypyrrole-Coated Low-Crystallinity Iron Oxide Grown on Carbon Cloth Enabling Enhanced Electrochemical Supercapacitor Performance

Direct Electrocatalytic Reduction of As(III) on CuSn Alloy Electrode: A Green and Sustainable Strategy to Recover Elemental Arsenic from Arsenic Wastewater

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Multilayered TNAs/SnO2/PPy/β-PbO2 anode achieving boosted electrocatalytic oxidation of As(III)

Cited by 36 publications

References 65 publications

Preparation of Ti/SnO2-Sb2O4-La Electrode with TiO2 Nanotubes Intermediate Layer and the Electrochemical Oxidation Performance of Rhodamine B

Preparation of Ti/SnO2-Sb2O4-La Electrode with TiO2 Nanotubes Intermediate Layer and the Electrochemical Oxidation Performance of Rhodamine B

Polypyrrole-Coated Low-Crystallinity Iron Oxide Grown on Carbon Cloth Enabling Enhanced Electrochemical Supercapacitor Performance

Direct Electrocatalytic Reduction of As(III) on CuSn Alloy Electrode: A Green and Sustainable Strategy to Recover Elemental Arsenic from Arsenic Wastewater

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Preparation of Ti/SnO₂-Sb₂O₄-La Electrode with TiO₂ Nanotubes Intermediate Layer and the Electrochemical Oxidation Performance of Rhodamine B

Preparation of Ti/SnO₂-Sb₂O₄-La Electrode with TiO₂ Nanotubes Intermediate Layer and the Electrochemical Oxidation Performance of Rhodamine B