An ion exchange strategy to BiOI/CH3COO(BiO) heterojunction with enhanced visible-light photocatalytic activity

Han, Qiaofeng; Yáng, Zhèn; Wang, Li; Shen, Zichen; Wang, Xin; Zhu, Junwu; Jiang, Xiaohong

doi:10.1016/j.apsusc.2017.01.173

Cited by 34 publications

(4 citation statements)

References 40 publications

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“…Fig. b shows two strong peaks with binding energies (BE) of 164.5 and 159.2 eV, corresponding to the Bi 4f 5/2 and Bi 4f 7/2 , which indicates that the chemical valence of Bi element was +3 . The O 1s spectrum was composed of two peaks after fitting (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, the RhB molecular can be excited to the excited state (RhB*) by absorbing the photons around λ = 554 nm, which transfer the electrons to the CB of BiOCl 0.5 Br 0.5 . Thus, O 2 in the solution would easily accept the photoexcited electron the CB of BiOCl 0.5 Br 0.5 to generate ˙O 2 − radicals due to more negative of E CB (−0.35 V) of BiOCl 0.5 Br 0.5 than the standard redox potential of O 2 /˙O 2 − (−0.28 eV) . Meanwhile, the photogenerated holes ( h + ) left on the VB of BiOCl 0.5 Br 0.5 could direct oxidize RhB .…”

Section: Resultsmentioning

confidence: 99%

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Milling‐Induced Synthesis of BiOCl_1‐xBr_x Solid Solution and Their Adsorptive and Photocatalytic Performance

Jia¹,

Han²,

Wang³

et al. 2018

Photochem & Photobiology

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CH COO(BiO) (denoted as BiOAc) is one of the most easily obtained bismuth compounds and was for the first time proposed by our group as an effective UV light photocatalyst. Herein, BiOCl Br (x refers to the feeding atomic ratio) were obtained using a facile solid state milling and subsequent water washing. More importantly, all of the as-prepared BiOCl Br possessed better visible light photocatalytic activity to the corresponding ones obtained by previously reported solution route. Especially at an optimal x value of 0.5, the solid solution showed the highest photodegradation efficiency (~100%) for rhodamine B (RhB) with a concentration of 30 mg L , whereas the degradation efficiency was only 63% over that obtained by solution route. Furthermore, the as-prepared BiOCl Br also exhibited excellent photodegradation activity for malachite green (MG). The superior photocatalytic performance of the as-prepared BiOCl Br could be attributed to its thinner sheetlike structures and highly exposed (001) facets, which enable effective separation of the photogenerated electrons and holes along the [001] direction. In addition, the as-prepared BiOCl Br revealed dramatic adsorption capacity for cationic dyes like MG, RhB and methylene violet (MV), as well as anion (Cr O ) owing to electrostatic interaction between cationic dyes and negatively charged surface of BiOCl Br , and positively charged surface in K Cr O solution (pH ≈ 3).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Milling‐Induced Synthesis of BiOCl_1‐xBr_x Solid Solution and Their Adsorptive and Photocatalytic Performance

Jia¹,

Han²,

Wang³

et al. 2018

Photochem & Photobiology

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“…In addition to stepping up the monitoring of the illegal use of toxic colorants, it is urgent to explore an effective, environmentally friendly, and economically practical strategy to reduce the effective concentration of toxic pollutants in biological environments, especially in water. In the past few decades, several treatment technologies for RhB removal have been established, including ion exchange, membrane filtration, adsorption process, Fenton oxidation, and photocatalytic technique . In 1972, Fujishima et al first reported the feasibility of aquatic hydrogen via a TiO 2 single crystal .…”

Section: Introductionmentioning

confidence: 99%

ZnO Nanoparticles Modified by Carbon Quantum Dots for the Photocatalytic Removal of Synthetic Pigment Pollutants

Jin

Tao

et al. 2023

ACS Omega

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Synthetic pigment pollutants caused by the rapid development of the modern food industry have become a serious threat to people's health and quality of life. Environmentally friendly ZnO-based photocatalytic degradation exhibits satisfactory efficiency, but some shortcomings of large band gap and rapid charge recombination reduce the removal of synthetic pigment pollutants. Here, carbon quantum dots (CQDs) with unique up-conversion luminescence were applied to decorate ZnO nanoparticles to effectively construct the CQDs/ ZnO composites via a facile and efficient route. The ZnO nanoparticles with a spherical-like shape obtained from a zinc-based metal organic framework (zeolitic imidazolate framework-8, ZIF-8) were coated by uniformly dispersive quantum dots. Compared with single ZnO particles, the obtained CQDs/ZnO composites exhibit enhanced light absorption capacity, decreased photoluminescence (PL) intensity, and improved visible-light degradation for rhodamine B (RhB) with the large apparent rate constant (k app ). The largest k app value in the CQDs/ZnO composite obtained from 75 mg of ZnO nanoparticles and 12.5 mL of the CQDs solution (∼1 mg•mL −1 ) was 2.6 times that in ZnO nanoparticles. This phenomenon may be attributed to the introduction of CQDs, leading to the narrowed band gap, an extended lifetime, and the charge separation. This work provides an economical and clean strategy to design visible-light-responsive ZnObased photocatalysts, which is expected to be used for the removal of synthetic pigment pollutants in food industry.

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“…Based on this approach, researchers have devised many strategies to tune the photocatalytic activity and have made great progress in the field of photocatalysis. Common surface engineering strategies include defect engineering, − morphology control, , crystal facet exposure, − and formation of surface heterojunctions. − Most importantly, these strategies can modulate the surface electronic structure and properties of photocatalysts. By modification of the surface states of photocatalytic materials, many inherent properties of the materials can be changed, such as energy band structure, light absorption properties, electron–hole pair separation efficiency, adsorption and activation energy of reactants, etc.…”

Section: Introductionmentioning

confidence: 99%

Progress and Outlook of Surface Engineering Strategies in Photocatalytic Materials for Mercury Removal: A Review

Yang,

Wu,

et al. 2023

Energy Fuels

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In recent years, the potential of photocatalysis for environmental purification and energy conversion has been gradually explored. However, the limited light absorption and easy recombination ability of photogenerated carriers limit its development. To promote the photocatalytic reaction, the surface modification of photocatalytic materials is usually performed to enhance the photocatalytic activity. This review first presents the recent research progress of surface engineering strategies in photocatalytic oxidation of elemental mercury. Then the mechanism of surface engineering strategies to promote photocatalytic oxidation of Hg0 reaction is analyzed at the level of energy band structure, carrier separation, and molecular activation. Next, the application of surface engineering strategies in photocatalysis is described, including environmental purification and energy conversion. Finally, future opportunities and challenges for the development of photocatalysis are presented. This review can not only provide scientific and theoretical guidance for the modification design of photocatalytic materials but also provide strong support for the preparation of photocatalysts for energy conversion and environmental remediation.

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An ion exchange strategy to BiOI/CH3COO(BiO) heterojunction with enhanced visible-light photocatalytic activity

Cited by 34 publications

References 40 publications

Milling‐Induced Synthesis of BiOCl_1‐xBr_x Solid Solution and Their Adsorptive and Photocatalytic Performance

Milling‐Induced Synthesis of BiOCl_1‐xBr_x Solid Solution and Their Adsorptive and Photocatalytic Performance

ZnO Nanoparticles Modified by Carbon Quantum Dots for the Photocatalytic Removal of Synthetic Pigment Pollutants

Progress and Outlook of Surface Engineering Strategies in Photocatalytic Materials for Mercury Removal: A Review

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An ion exchange strategy to BiOI/CH3COO(BiO) heterojunction with enhanced visible-light photocatalytic activity

Cited by 34 publications

References 40 publications

Milling‐Induced Synthesis of BiOCl1‐xBrx Solid Solution and Their Adsorptive and Photocatalytic Performance

Milling‐Induced Synthesis of BiOCl1‐xBrx Solid Solution and Their Adsorptive and Photocatalytic Performance

ZnO Nanoparticles Modified by Carbon Quantum Dots for the Photocatalytic Removal of Synthetic Pigment Pollutants

Progress and Outlook of Surface Engineering Strategies in Photocatalytic Materials for Mercury Removal: A Review

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Product

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Milling‐Induced Synthesis of BiOCl_1‐xBr_x Solid Solution and Their Adsorptive and Photocatalytic Performance

Milling‐Induced Synthesis of BiOCl_1‐xBr_x Solid Solution and Their Adsorptive and Photocatalytic Performance