Enhanced visible light photocatalytic activity in AgI/BiOCOOH composite

Hao, Mengjian; Yi, Tiantian; Cao, Yongfan; Song, Yinmin; Cao, Zhenzhu; He, Wei; Gao, Yanfang; Liu, Jinrong

doi:10.1016/j.apt.2018.10.012

Cited by 22 publications

(2 citation statements)

References 41 publications

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“…As one of the most important radicals in photocatalytic systems, • OH is typically formed through the reaction of h + with H 2 O; − thus, scavengers for • OH have been extensively investigated. A substance can be used as a scavenger provided that its second-order rate constants ( k • OH ) with the species are ≥10 9 . − Presently, the most common • OH scavengers are alcohols with most of their second-order rate constants being ∼10 9 [e.g., ethanol (EtOH), methanol (MeOH), tert -butanol (TBA), isopropanol (IPA), n -butanol, etc.…”

Section: Introductionmentioning

confidence: 99%

Alcohols as Scavengers for Hydroxyl Radicals in Photocatalytic Systems: Reliable or Not?

Ding,

Hou,

Liu

et al. 2023

ACS EST Water

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The evaluation of the contributions of hydroxyl radicals ( • OH) is of great significance toward the elucidation of photocatalytic mechanisms. Currently, trapping (or quenching) tests have been widely conducted for the determination of reactive species, where alcohols are often selected as • OH scavengers. However, their feasibility and reliability have been under scrutiny by researchers and need to be further explored. For this study, a photocatalytic system was established using P25 as the photocatalyst and bisphenol A (BPA) and oxalic acid as model pollutants under UV light irradiation. The quenching capacities of five alcohols were investigated at concentrations ranging from 0.5 to 100 mM. The alcohols revealed different quenching abilities in the BPA and oxalic acid systems. Further, the amount of H 2 O 2 generated from highly concentrated alcohols was quantified, which significantly influenced the estimation of the contribution of • OH. Unexpectedly, • O 2 − was also formed in the system, whose contribution to the degradation of pollutants was also mistakenly attributed to • OH. This study provides a comprehensive evaluation of the five most commonly used alcohols as scavengers for • OH. Based on the findings, it strongly recommends reconsidering these alcohols and emphasizes the need for developing more reliable methods for detecting radicals.

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Section: Introductionmentioning

confidence: 99%

Alcohols as Scavengers for Hydroxyl Radicals in Photocatalytic Systems: Reliable or Not?

Ding,

Hou,

Liu

et al. 2023

ACS EST Water

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“…[25][26][27] For example, AgI/BiOCOOH heterojunction was constructed by loading AgI nanoparticles on BiOCOOH flower-like microspheres that showed good visible light capture capability and photocatalytic degradation efficiency for RhB. 28 Similarly, AgI/BiOI composite with a 3D hierarchical microsphere was fabricated to accelerate the separation of photogenerated carriers. 29 In addition, the direct Z-Scheme AgI/Bi 4 V 2 O 11 heterojunction was reported to promote the dispersion of AgI and inhibit the agglomeration of AgI.…”

Section: Introductionmentioning

confidence: 99%

PVP‐assisted synthesis of P‐Bi₄O₅Br₂/AgI heterojunction with enhanced photocatalytic activity for degradation of rhodamine B

Luo

Xiao

Wang

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: The commonly used RhB dye is a carcinogen that is widely found in environmental matrices and poses a threat to aquatic biota and human health. However, conventional wastewater treatment processes do not effectively remove low concentrations of these pollutants. Herein, the P-Bi 4 O 5 Br 2 /AgI (PBA) heterojunction was synthesized via a polyvinylpyrrolidone (PVP)-assisted solvothermal and precipitation method in this work. RESULTS:The photocatalytic efficiency of the PBA heterojunction was evaluated by degrading rhodamine B (RhB) with the irradiation of simulated sunlight. P-Bi 4 O 5 Br 2 /AgI-50 (PBA-50, the mass fraction of AgI in the composite was 50%) composite could degrade 98% RhB under 90 min irradiation of 500 W Xenon lamp, and its pseudo first-order reaction rate constant was 0.04265 min −1 , which was 17.1, 2.16, and 2.94 times higher than that of Bi 4 O 5 Br 2 , P-Bi 4 O 5 Br 2 , and AgI, respectively. Besides, the effects of the dosage of photocatalyst and the anion on the photocatalytic degradation of RhB over PBA-50 were analyzed. CONCLUSION:The enhanced photocatalytic activity of PBA was attributed to its better visible light capture ability, larger specific surface area, and faster photogenerated carrier separation efficiency, all of which were confirmed by scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), UV-Vis diffues reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), and photoelectrochemical analysis. In addition, the free radical trapping experiments confirmed that •O 2 − and h + were the main active species for degradation of RhB. Additionally, the smaller bandgap and the more negative conduction band position of Bi 4 O 5 Br 2 were reached after the introduction of PVP. Accordingly, a possible type-II heterojunction photocatalytic mechanism of P-Bi 4 O 5 Br 2 /AgI was proposed.

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Preparation, characterization, and photocatalytic activity of novel AgBr/ZIF-8 composites for water purification

Zeng

Feng

et al. 2020

Advanced Powder Technology

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Enhanced visible light photocatalytic activity in AgI/BiOCOOH composite

Cited by 22 publications

References 41 publications

Alcohols as Scavengers for Hydroxyl Radicals in Photocatalytic Systems: Reliable or Not?

Alcohols as Scavengers for Hydroxyl Radicals in Photocatalytic Systems: Reliable or Not?

PVP‐assisted synthesis of P‐Bi₄O₅Br₂/AgI heterojunction with enhanced photocatalytic activity for degradation of rhodamine B

Preparation, characterization, and photocatalytic activity of novel AgBr/ZIF-8 composites for water purification

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Enhanced visible light photocatalytic activity in AgI/BiOCOOH composite

Cited by 22 publications

References 41 publications

Alcohols as Scavengers for Hydroxyl Radicals in Photocatalytic Systems: Reliable or Not?

Alcohols as Scavengers for Hydroxyl Radicals in Photocatalytic Systems: Reliable or Not?

PVP‐assisted synthesis of P‐Bi4O5Br2/AgI heterojunction with enhanced photocatalytic activity for degradation of rhodamine B

Preparation, characterization, and photocatalytic activity of novel AgBr/ZIF-8 composites for water purification

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PVP‐assisted synthesis of P‐Bi₄O₅Br₂/AgI heterojunction with enhanced photocatalytic activity for degradation of rhodamine B