Carbon dot-coupled BiVO4/reduced graphene hydrogel for significant enhancement of photocatalytic activity: Antibiotic degradation and CO2 reduction

Ma, Changchang; Xie, Zhuohong; Seo, Won Cheol; Din, Syed Taj Ud; Lee, Jeongwoo; Kim, Youjoong; Jung, Hyun Suk; Yang, Woochul

doi:10.1016/j.apsusc.2021.150564

Cited by 36 publications

(10 citation statements)

References 51 publications

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“…Monoclinic BiVO 4 (BVO) has been widely studied as a photocatalyst due to its remarkable photo response, outstanding stability, and narrow band gap (≈2.4 eV). Yang et al [ 178 ] synthesized a new hybrid photocatalyst (CD‐BVO/rGH) by combining CDs decorated BiVO 4 with reduced graphene hydrogel (rGH) via in situ solvothermal growth. The CD‐BVO/rGH photocatalyst observably improved the photocatalytic efficiency for removing tetracycline hydrochloride (TCH) and reducing CO 2 , which benefits from synergistic effects, such as the directional migration of charge carriers from the BVO to the CDs, and the enhanced transfer and separation of the photo generated charge carriers by the 3D network structure of the rGH (Figure 19b).…”

Section: Applications Of Cd‐based Hydrogelsmentioning

confidence: 99%

Carbon Dot‐Based Hydrogels: Preparations, Properties, and Applications

Wang

Yin

et al. 2023

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heat, electricity, magnetism, mechanics, and chemistry. For example, the involvement of nanoparticles has proved to be an effective strategy to impart multifunctional properties to the hydrogels. [11] As a composite material, nanoparticle hydrogel composites have made remarkable progress in the fields of biomedicine, [12,13] sensing, [14,15] advanced energy technology, [16] environment and industry. [17] For another example, fluorescent hydrogels have been constructed by introducing organic dyes, [18,19] lanthanides, [20,21] or semiconductor quantum dots [22] into the hydrogel system.CDs are a novel class of carbon-based nanomaterials, which can be viewed as the relatives of nanoparticles with contractible sizes (typically <10 nm). Compared with other nanoparticles, CDs have high photostability, [23] low cost, [24] good biocompatibility, [25] high water solubility, and tunable photoluminescence. [26] These intriguing properties afford CDs many potential applications in biomedicine, [27,28] sensing, [29,30] catalysis, [31,32] optoelectronic devices, [33][34][35] and anticounterfeiting. [36] The emergence of CDs solved the long-lasting drawbacks of traditional PL materials, such as the poor photostability of organic dyes, the high cost of lanthanides, and the toxicity of semiconductor quantum dots. Generally, CDs can be obtained by two strategies. One is the top-down route, in which the CDs are broken off from larger carbon species. The other is the bottomup route, in which the CDs are synthesized by using molecular precursors. [37] According to the micro-/nanostructure, formation mechanism, and precursors used, CDs are mainly divided into four categories: [38] graphene quantum dots (GQDs), carbon quantum dots (CQDs), carbon nanodots (CNDs), and carbonized polymer dots (CPDs). GQDs with one or multiple-layer graphite structure and apparent graphene lattices are generally gained by "top-down" prepared routes: oxidation of cutting bulky graphitized carbon materials. CQDs, CNDs, and CPDs are usually synthesized from biomass, small molecules, or polymers by assembling, polymerization, crosslinking, and carbonization by "bottom-up" routes. CQDs have graphitelike crystal lattices with surface functional groups, showing internal state luminescence and the quantum size confinement. CNDs also have a large number of functional groups on the surface, but the cores of CNDs contain amorphous carbon without apparent crystal lattices. [39] CPDs have unique "core-shell" nanostructures, consisting of carbon cores with Hydrogels have extremely high moisture content, which makes it very soft and excellently biocompatible. They have become an important soft material and have a wide range of applications in various fields such as biomedicine, bionic smart material, and electrochemistry. Carbon dot (CD)-based hydrogels are based on carbon dots (CDs) and auxiliary substances, forming a gel material with comprehensive properties of individual components. CDs embedding in hydrogels could not only solve their aggregation-caused quenching (A...

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Section: Applications Of Cd‐based Hydrogelsmentioning

confidence: 99%

Carbon Dot‐Based Hydrogels: Preparations, Properties, and Applications

Wang

Yin

et al. 2023

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“…According to the PL spectra as shown in Figure 25B, the CD-BVO/rGH PL intensity was significantly lower than that of BVO and BVO/rGH, indicating enhanced charge separation. 212 Bian et al investigated the effect of the photocatalyst's surface area by coupling BiVO 4 nanoflakes with TiO 2 F I G U R E 2 3 A, Methanol and B, acetone yields from the photoreduction of CO 2 using Bi-BiVO 4 catalysts obtained by microwave synthesis at 240 C and (I) 5 minutes without magnetic stirring, (II) 15 minutes without magnetic stirring, (III) 5 minutes under magnetic stirring at 1200 rpm, and (IV) 15 minutes under magnetic stirring at 1200 rpm. 203 C, Cycling curves of CH 4 yield for BVO-10% Co atomic layers.…”

Section: Bivo 4 Coupling With Other Semiconductorsmentioning

confidence: 99%

“…When direct contact occurs, free electrons will move from ZnO through the higher Fermi level to the graphene lower F I G U R E 2 5 A, CO 2 -TPD of different composites of CeO x / BiVO 4 (BVO) for CO 2 reduction. 210 B, PL emission spectra of CD-BVO/rGH 212 and C, proposed Cascade Zscheme mechanism of photogenerated charge transfer on MPc-coupled BVNS (M represents transition metal) 211 Fermi level until equilibrium is achieved. Then after light incident, the Fermi level of ZnO will rise from À4.28 to À3.90 eV because the photo induced electrons are transferred to the CB of ZnO.…”

Section: Doping and Cocatalyst Additionmentioning

confidence: 99%

Recent advances in constructing heterojunctions of binary semiconductor photocatalysts for visible light responsive CO ₂ reduction to energy efficient fuels: A review

Alhebshi

Aldeen

Mim

et al. 2021

Intl J of Energy Research

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Photocatalysis of carbon dioxide by the assistance of solar energy has been one of the most promising approaches to reduce CO 2 to renewable fuel. Several methods are pertained to enhance the photocatalytic activity for stimulating CO 2 reduction to selective fuels. Even though many researchers have been exploring methods of assembling a suitable semiconductor, practical constraints such as charge carrier recombination and low light utilization limit the photocatalytic activity. In this review, recent advancement in semiconductors and their characteristics toward the photoreduction of CO 2 has been comprehensively discussed. The major semiconductors that are discussed and analyzed based on their limitations in this review are TiO 2 , BiVO 4 , CdS, g-C 3 N 4 , ZnO, and MoS 2 -based composites. Initially, the fundamentals of heterogeneous photocatalysis such as the possible molecular pathways, product selectivity, and thermodynamics have been deliberated. Advancement in semiconductors in relation to quantum dots, heterojunction, and sacrificial reagent has been systematically analyzed. Doping and co-doping of semiconductors have proven to reduce the band gap notably and its outstanding electronic band position for the visible light photocatalysis has been identified. Furthermore, the developments of cocatalysts such as noble metals and nonmetals to stimulate photocatalysts performance in view of CO 2 reduction to value-added products have been disclosed. Specific developments in binary semiconductors through Z-scheme, S-scheme, and ternary heterojunction for charge separation and their characterization has been thoroughly deliberated. In addition, the role of doping, structural defects, as well as sensitization in enhancing the light harvesting abilities of the photocatalyst has been discoursed. The developments in photocatalytic reactors with their characteristics and limitations are also assiduously discussed. Finally, conclusions and future directions for photocatalysis of carbon dioxide toward renewable fuel production have been suggested.

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“…Although the bandgap and energy band position thermodynamically determine whether the photocatalytic CO 2 reduction reaction can be realized on BiVO 4 , the separation and transport of photogenerated electron-hole pairs as well as the subsequent redox reaction on the surface of catalysts are considered as the determining step of the photocatalytic CO 2 reduction reaction. [31][32][33][34][35] Therefore, accelerating charge transfer and promoting surface reactions are conducive to enhancing carrier separation and CO 2 conversion activity. In this process, the deposition of cocatalysts makes sense.…”

Section: Introductionmentioning

confidence: 99%

Facilitating space charge directional separation for enhancing photocatalytic CO₂ reduction over tetragonal BiVO₄

Dai

et al. 2022

Catal. Sci. Technol.

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Carbon dot-coupled BiVO4/reduced graphene hydrogel for significant enhancement of photocatalytic activity: Antibiotic degradation and CO2 reduction

Cited by 36 publications

References 51 publications

Carbon Dot‐Based Hydrogels: Preparations, Properties, and Applications

Carbon Dot‐Based Hydrogels: Preparations, Properties, and Applications

Recent advances in constructing heterojunctions of binary semiconductor photocatalysts for visible light responsive CO ₂ reduction to energy efficient fuels: A review

Facilitating space charge directional separation for enhancing photocatalytic CO₂ reduction over tetragonal BiVO₄

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Carbon dot-coupled BiVO4/reduced graphene hydrogel for significant enhancement of photocatalytic activity: Antibiotic degradation and CO2 reduction

Cited by 36 publications

References 51 publications

Carbon Dot‐Based Hydrogels: Preparations, Properties, and Applications

Carbon Dot‐Based Hydrogels: Preparations, Properties, and Applications

Recent advances in constructing heterojunctions of binary semiconductor photocatalysts for visible light responsive CO 2 reduction to energy efficient fuels: A review

Facilitating space charge directional separation for enhancing photocatalytic CO2 reduction over tetragonal BiVO4

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Product

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Recent advances in constructing heterojunctions of binary semiconductor photocatalysts for visible light responsive CO ₂ reduction to energy efficient fuels: A review

Facilitating space charge directional separation for enhancing photocatalytic CO₂ reduction over tetragonal BiVO₄