Enhanced photocatalytic performance of spherical BiOI/MnO<sub>2</sub> composite and mechanism investigation

Zhou, Qingjie; Zhang, Lizhu; Zuo, Pengjian; Wang, Yang; Yu, Zhenjiang

doi:10.1039/c8ra06930a

Cited by 29 publications

(3 citation statements)

References 31 publications

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“…MnO2 at 2θ = 28°, 37°, 42°, 56°, and 72° have obvious characteristic peaks, and the diffraction peaks are sharp, consistent with the standard card (JCPDS 81-2261) β-MnO2. The intensity of MnO2 peak in the complex decreases, which may be due to the strong characteristic peak of ZnO, which masks the peak of MnO2 and leads to the weakening of MnO2 diffraction intensity [41]. XRD patterns indicate that we successfully synthesized ZnO-C/MnO2 composites with relatively good crystallinity.…”

Section: Representational Analysismentioning

confidence: 93%

Wastewater Purification and All-Solid Z-Scheme Heterojunction ZnO-C/MnO2 Preparation: Properties and Mechanism

Zhao

Yang

et al. 2022

Catalysts

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Unlike many studies on the preparation of Z-scheme heterojunctions by doping precious metals, in this paper we first prepared a core-shell material obtained by C doping in ZnO and then composite with MnO2 to form a heterojunction; that is, a low-cost and highly catalytic ternary composite catalyst was prepared by a simple hydrothermal reaction. Meanwhile, a large amount of experimental data have enabled the heterostructure type as well as the mechanism of photocatalytic performance to be fully demonstrated. It is proven that C as an intermediate medium achieves electron transport while making up the deficiency of ZnO, and constitutes an all-solid state Z-scheme heterojunction, which enables the rapid transfer of photogenerated electron pairs and visible light irradiation to the stream to improve the photocatalytic performance of the composite photocatalyst. In terms of examination of degradation performance, this catalyst showed a high photodegradation rate of tetracycline hydrochloride (TC) of 92.6% within 60 min, and the surface ZnO-C/MnO2 catalysts also showed good degradation effect on practical petrochemical wastewater in CODcr degradation experiments.

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Section: Representational Analysismentioning

confidence: 93%

Wastewater Purification and All-Solid Z-Scheme Heterojunction ZnO-C/MnO2 Preparation: Properties and Mechanism

Zhao

Yang

et al. 2022

Catalysts

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“…The efficiency of photoinduced carrier migration, transfer, and separation during the photocatalytic degradation process was examined using photoluminescence (PL) spectra [57]. PL emission usually results from photoexcited electron-hole pairs recombining [58].…”

Section: Proposed Photocatalytic Mechanismmentioning

confidence: 99%

Ti3C2-MXene/NiO Nanocomposites-Decorated CsPbI3 Perovskite Active Materials under UV-Light Irradiation for the Enhancement of Crystal-Violet Dye Photodegradation

Alothman,

Khan,

Albaqami

et al. 2023

Nanomaterials

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Ti3C2-MXene material, known for its strong electronic conductivity and optical properties, has emerged as a promising alternative to noble metals as a cocatalyst for the development of efficient photocatalysts used in environmental cleanup. In this study, we investigated the photodegradation of crystal-violet (CV) dye when exposed to UV light using a newly developed photocatalyst known as Ti3C2-MXene/NiO nanocomposite-decorated CsPbI3 perovskite, which was synthesized through a hydrothermal method. Our research investigation into the structural, morphological, and optical characteristics of the Ti3C2-MXene/NiO/CsPbI3 composite using techniques such as FTIR, XRD, TEM, SEM–EDS mapping, XPS, UV–Vis, and PL spectroscopy. The photocatalytic efficacy of the Ti3C2-MXene/NiO/CsPbI3 composite was assessed by evaluating its ability to degrade CV dye in an aqueous solution under UV-light irradiation. Remarkably, the Ti3C2-MXene/NiO/CsPbI3 composite displayed a significant improvement in both the degradation rate and stability of CV dye when compared to the Ti3C2-MXene/NiO nanocomposite and CsPbI3 perovskite materials. Furthermore, the UV–visible absorption spectrum of the Ti3C2-MXene/NiO/CsPbI3 composite demonstrated a reduced band gap of 2.41 eV, which is lower than that of Ti3C2-MXene/NiO (3.10 eV) and Ti3C2-MXene (1.60 eV). In practical terms, the Ti3C2-MXene/NiO/CsPbI3 composite achieved an impressive 92.8% degradation of CV dye within 90 min of UV light exposure. We also confirmed the significant role of photogenerated holes and radicals in the CV dye removal process through radical scavenger trapping experiments. Based on our findings, we proposed a plausible photocatalytic mechanism for the Ti3C2-MXene/NiO/CsPbI3 composite. This research may open up new avenues for the development of cost-effective and high-performance MXene-based perovskite photocatalysts, utilizing abundant and sustainable materials for environmental remediation.

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“…To identify the active species during photocatalysis, trapping experiments were carried out in the 1%wt-FeVO4/Bi4O5Br2 reaction system. Isopropyl alcohol (IPA), benzoquinone (BQ) or ascorbic acid (ASC), and ammonium oxalate (AO) with 1 mmol L −1 were added to the reaction solutions to scavenge hydroxyl radicals (•OH), superoxide radicals (•O2 − ), and holes (h + ), respectively [45][46][47]. The addition of BQ and AO critically suppressed the BPA photodegradation efficiency (Figure 9(a)).…”

Section: Photocatalytic Degradation Of Organic Pollutantsmentioning

confidence: 99%

Facile synthesis and enhanced photocatalytic activity of a novel FeVO4/Bi4O5Br2 heterojunction photocatalyst through step-scheme charge transfer mechanism

Luangwanta

Chachvalvutikul

Kaowphong

2021

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Enhanced photocatalytic performance of spherical BiOI/MnO₂ composite and mechanism investigation

Abstract: In this paper, a novel flower-like BiOI/MnO2 composite was synthesized by two simple steps.

Cited by 29 publications

References 31 publications

Wastewater Purification and All-Solid Z-Scheme Heterojunction ZnO-C/MnO2 Preparation: Properties and Mechanism

Wastewater Purification and All-Solid Z-Scheme Heterojunction ZnO-C/MnO2 Preparation: Properties and Mechanism

Ti3C2-MXene/NiO Nanocomposites-Decorated CsPbI3 Perovskite Active Materials under UV-Light Irradiation for the Enhancement of Crystal-Violet Dye Photodegradation

Facile synthesis and enhanced photocatalytic activity of a novel FeVO4/Bi4O5Br2 heterojunction photocatalyst through step-scheme charge transfer mechanism

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Enhanced photocatalytic performance of spherical BiOI/MnO2 composite and mechanism investigation

Abstract: In this paper, a novel flower-like BiOI/MnO2 composite was synthesized by two simple steps.

Cited by 29 publications

References 31 publications

Wastewater Purification and All-Solid Z-Scheme Heterojunction ZnO-C/MnO2 Preparation: Properties and Mechanism

Wastewater Purification and All-Solid Z-Scheme Heterojunction ZnO-C/MnO2 Preparation: Properties and Mechanism

Ti3C2-MXene/NiO Nanocomposites-Decorated CsPbI3 Perovskite Active Materials under UV-Light Irradiation for the Enhancement of Crystal-Violet Dye Photodegradation

Facile synthesis and enhanced photocatalytic activity of a novel FeVO4/Bi4O5Br2 heterojunction photocatalyst through step-scheme charge transfer mechanism

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Enhanced photocatalytic performance of spherical BiOI/MnO₂ composite and mechanism investigation