Facile preparation of visible-light-responsive kaolin-supported Ag@AgBr composites and their enhanced photocatalytic properties

Tun, Phyu Phyu; Wang, Kai; Naing, HtetHtet; Wang, Junting; Zhang, Gaoke

doi:10.1016/j.clay.2019.04.003

Cited by 40 publications

(4 citation statements)

References 60 publications

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“…The e − from Cu‐TiO 2 could also transfer from CB to SCK through percolation mechanism 42,43 . In fact, kaolin acts as electrons acceptor due to the presence of Lewis acid sites 44 . The Al 2 O 3 between SCK and Cu‐TiO 2 could act as a barrier layer between electron donor and acceptor, and thus inhibits electron back transfer from SCK to the Cu‐TiO 2 45,46 .…”

Section: Resultsmentioning

confidence: 99%

“…The Al 2 O 3 between SCK and Cu‐TiO 2 could act as a barrier layer between electron donor and acceptor, and thus inhibits electron back transfer from SCK to the Cu‐TiO 2 45,46 . Furthermore, the photo‐induced electron from Lewis acid sites of SCK could also combine with O 2 and lead to the formation of O 2 •− , which is a powerful oxidant to degrade RhB 44 . Moreover, the formation of AlOTi bonds between Cu‐TiO 2 and SCK give a rise to a positive shift of the VB edge of CTSCK, enhances its oxidation capability of photo‐generated holes and its RhB photodegradation efficiency.…”

Section: Resultsmentioning

confidence: 99%

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Visible‐light‐driven photocatalytic activity of kaolinite: Sensitized by in situ growth of Cu‐TiO₂

Liu

Wang

Zhang

et al. 2020

Env Prog and Sustain Energy

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Sensitized kaolinite with improved visible‐light catalytic activity was prepared via a facile in‐situ growth of nanosized Cu‐TiO2 on the surface of the sulfated kaolinite impregnated in Cu‐TiO2 sol. The as‐prepared photocatalysts were characterized in terms of various techniques. The transmission electron microscope and energy dispersive spectrometer results revealed that Cu‐TiO2 could grow on the surface of the pretreated kaolinite and the aggregation of Cu‐TiO2 was successfully inhibited. The X‐ray photoelectron spectrum confirmed the formation of AlOTi bonds between Cu‐TiO2 and sulfated kaolinite in the sensitized kaolinite composite. The sensitized kaolinite composite exhibited significantly improved performance in the degradation of Rhodamine B (RhB), leading to about 87% of RhB degradation in 180 min, which is superior to that of the kaolinite, calcined kaolin, and sulfated calcined kaolin under visible‐light irradiation. The superior photodegradation activity of the sensitized kaolinite composite was primarily attributed to the synergetic effect of Cu‐TiO2 sensitization and sulfation, resulting from the efficient transfer and separation of the photo‐induced charge carriers between Cu‐TiO2 and kaolinite.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Visible‐light‐driven photocatalytic activity of kaolinite: Sensitized by in situ growth of Cu‐TiO₂

Liu

Wang

Zhang

et al. 2020

Env Prog and Sustain Energy

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“…When Ag/AgBr nanoparticles are irradiated with visible light, AgBr generate electron-hole pairs by formulating electrons and holes in the conduction band (CB) and valence band (VB), respectively. The electron from CB band of AgBr quickly migrates to the Ag nanoparticles on the surface since the CB potential of AgBr is negative relative to the Fermi level of Ag (0.4 eV) (Tun et al 2019).…”

Section: Photocatalytic Decomposition Mechanism Of 24-dcpmentioning

confidence: 99%

Photocatalytic degradation of 2,4-dichlorophenol using nanomaterials silver halide catalysts

Moja,

Mapossa,

Chirwa

et al. 2024

Environ Sci Pollut Res

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In this study, the photocatalytic activity of nanomaterials Ag/AgX (X = Cl, Br, I) is reported. Highly efficient silver halide (Ag/AgX where X = Cl, Br, I) photocatalysts were synthesized through a hydrothermal method. The samples were characterized using a range of techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and Brunauer–Emmett–Teller (BET) to check their structural, morphology, textural and optical properties. In addition, the photocatalytic activity of photocatalysts was evaluated through the degradation of 2,4-dichlorophenol (2,4-DCP) under UV and visible light irradiation. XRD analysis confirmed the presence of a single-phase structure (pure phase) in the synthesized photocatalysts. SEM micrographs showed agglomeration with a non-uniform distribution of particles, which is a characteristic of surfactant-free precipitation reactions in aqueous media. The Ag/AgBr photocatalyst exhibited the best degradation efficiency, resulting in 83.37% and 89.39% photodegradation after 5 h of UV and visible light irradiation, respectively. The effect of catalyst loading, initial solution pH, and 2,4-DCP concentration was investigated for the best-performing Ag/AgBr photocatalyst. The degradation kinetics were best described by the pseudo-first-order Langmuir–Hinshelwood model. The photocatalytic capacity of Ag/AgBr decreased by 50% after five reuse cycles. SEM images revealed heightened levels of photodegradation on the catalyst surface. The study proved the feasibility of using simple synthesis methods to produce visible light active photocatalysts capable of degrading refractory phenolic pollutants in aqueous systems.

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“…Over the past several years, the introduction of noble metallic nanoparticles (e.g., Au, Ag, and Pt, etc.) into the photocatalysts for an improvement in their photocatalytic performance has intensively gained attention from research communities due to the strong SPR of the plasmonic metal nanoparticles, which may improve visible light absorption [126]. Generally, the SPR is a physical phenomenon that happens when free electrons oscillate with incident photons confined on the surface of the noble metallic nanoparticles (Figure 17).…”

Section: Bismuth-based Photocatalysts/laponitementioning

confidence: 99%

Recent Clay-Based Photocatalysts for Wastewater Treatment

et al. 2023

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Photocatalysis is a remarkable methodology that is popular and applied in different interdisciplinary research areas such as the degradation of hazardous organic contaminants in wastewater. In recent years, clay-based photocatalyst composites have attracted significant attention in the field of photocatalysis owing to their abundance, excellent light response ability, and stability. This review describes the combination of clay with focusing photocatalysts such as TiO2, g-C3N4, and Bi-based compounds for degrading organic pollutants in wastewater. Clay-based composites have more active surface sites, resulting in inhibited photocatalyst particle agglomeration. Moreover, clay enhances the creation of active radicals for organic pollutant degradation by separating photogenerated electrons and holes. Thus, the functions of clay in clay-based photocatalysts are not only to act as a template to inhibit the agglomeration of the main photocatalysts but also to suppress charge recombination, which may lengthen the electron–hole pair’s lifespan and boost degrading activity. Moreover, several types of clay-based photocatalysts, such as the clay type and main photocatalyst, were compared to understand the function of clay and the interaction of clay with the main photocatalyst. Thus, this study summarizes the recent clay-based photocatalysts for wastewater remediation and concludes that clay-based photocatalysts have considerable potential for low-cost, solar-powered environmental treatment.

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Facile preparation of visible-light-responsive kaolin-supported Ag@AgBr composites and their enhanced photocatalytic properties

Cited by 40 publications

References 60 publications

Visible‐light‐driven photocatalytic activity of kaolinite: Sensitized by in situ growth of Cu‐TiO₂

Visible‐light‐driven photocatalytic activity of kaolinite: Sensitized by in situ growth of Cu‐TiO₂

Photocatalytic degradation of 2,4-dichlorophenol using nanomaterials silver halide catalysts

Recent Clay-Based Photocatalysts for Wastewater Treatment

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Facile preparation of visible-light-responsive kaolin-supported Ag@AgBr composites and their enhanced photocatalytic properties

Cited by 40 publications

References 60 publications

Visible‐light‐driven photocatalytic activity of kaolinite: Sensitized by in situ growth of Cu‐TiO2

Visible‐light‐driven photocatalytic activity of kaolinite: Sensitized by in situ growth of Cu‐TiO2

Photocatalytic degradation of 2,4-dichlorophenol using nanomaterials silver halide catalysts

Recent Clay-Based Photocatalysts for Wastewater Treatment

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Product

Resources

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Visible‐light‐driven photocatalytic activity of kaolinite: Sensitized by in situ growth of Cu‐TiO₂

Visible‐light‐driven photocatalytic activity of kaolinite: Sensitized by in situ growth of Cu‐TiO₂