Synthesis of Ag3PO4–AgBr with a novel heterostructure, and its photocatalytic properties

Wang, Xiufang; Yuan, Shizhen; Chen, Shaohua; Chen, Guangmei; Zhang, Jun; Zhang, Lei

doi:10.1007/s11164-014-1617-6

Cited by 15 publications

(3 citation statements)

References 24 publications

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“…The rational design involving -CF 3 substitution as an electron withdrawing group parameter continues unabated for deepening the research impact of porphyrinoids in photocatalysis and other applications. Since interests in photosynthesis and photocatalysis reach far into engineering and economic factors; the phosphorus(V) corrole offers clear options for inexpensive photosensitization/photocatalysis purposes. − The PF 2 corrole (composed of only C, H, N, P, and F atoms), on top of the benefits of having a catalyst with no element that raises potential environmental or health concerns, is a thermodynamically and photostable platform ,,, that is conveniently addressed through theoretical studies. In particular, the use of DFT calculations and the consideration and comparison of the MO theoretical studies allow for a rationalization, not only of the geometry and changing of subtle electronics within a closely related set of compounds but also of fueling of a predictive power.…”

Section: Introductionmentioning

confidence: 99%

Maximizing Property Tuning of Phosphorus Corrole Photocatalysts through a Trifluoromethylation Approach

et al. 2019

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An eight-member series of CF3-substituted difluorophosphorus corroles was prepared for establishing a structure–activity profile of these high-potential photosensitizers. It consisted of preparing all four possible isomers of the monosubstituted corrole and complexes with 2-, 3-, 4-, and 5-CF3 groups on the macrocycle’s periphery. The synthetic pathway to these CF3-substituted derivatives, beginning with (tpfc)PF 2 , involves two different initial routes: (i) direct electrophilic CF3 incorporation using FSO2CF2CO2Me and copper iodide, or (ii) bromination to achieve the 2,3,8,17,18-pentabrominated compound using excess bromine in methanol. Crystallographic investigations revealed that distortion of the original planar macrocycle is evident even in the monosubstituted case and that it becomes truly severe for the penta-CF3-substituted derivative 5. There is a shift in redox potentials of about 193 mV per -CF3 group, which decreases to only 120 mV for the fifth one in 5. Differences in the electronic spectra suggest that the Gouterman four orbital model decreases in relevance upon gradual -CF3 substitution, a conclusion that was corroborated by DFT calculations. The very significant energy lowering of the frontier orbitals suggested that photoexcitation should lead to a highly oxidizing photocatalyst. This hypothesis was proven true by finding that the most synthetically accessible CF3-substituted derivative is an excellent catalyst for the photoinduced conversion of bromide to bromine (phenol, toluene, and benzene assay).

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Section: Introductionmentioning

confidence: 99%

Maximizing Property Tuning of Phosphorus Corrole Photocatalysts through a Trifluoromethylation Approach

et al. 2019

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“…4; Br 3d and Ag 3d spectra, respectively), suggesting that both surfactant cations and ion pairs occurred in this sample, interacting with the clay, respectively by ion exchange and sorption through weak interaction 24,26 . Furthermore, the peak at 69.3 eV besides that located at 68.3 eV, for MH2-Ag could be attributed to the crystal lattice of Brin AgBr 28,31 .…”

Section: Modified Clays Characterizationmentioning

confidence: 88%

“…The BE value decrease for the second N 1s peak was assigned to an increase in electron density on the nitrogen atom due to a charge transfer from the clay sheets (Fig. 2C) 24,28 . This analysis was in agreement with the C 1s spectra of C-N bonds (Fig.…”

Section: Modified Clays Characterizationmentioning

confidence: 99%

Correlating Antimicrobial activity and Structure in Montmorillonite modified with Hexadecyltrimethylammonium and Silver

2018

IJCTR

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The relationship between antimicrobial properties and structure of montmorillonite (MMT) containing hexadecyltrimethylammonium bromide (HDTMA-Br) and silver (Ag) was determined. HDTMA was adsorbed at the clay interlayer by a cation exchange, through the positive head of the ammonium group. At higher surfactant loadings (100 and 200% cation exchange capacity (CEC); MH1 and MH2 samples, respectively) the prevalence of weak adsorption (Van der Waals forces) was observed; whereas below the clay CEC (50%, MH0.5) strong interactions predominated (cation exchange). These different interactions impacted on antimicrobial activity, increasing bactericidal capacity when the surfactant was more available to diffuse. For organo-montmorillonites (OMMT) and all samples with Ag, zeta potential pointed out electrical charge changes on the outer surface, respect to MMT. XPS analyses showed peaks attributed to clusters formation, silver oxidation, and Ag 0 in MMT-Ag and MH0.5-Ag. The Ag 0 peak was also present in MH1-Ag and MH2-Ag, the later showing an extra peak associated with AgBr. HDMTA + and Ag adsorbed on the MMT acted synergistically against Staphylococcus aureus. This effect was less noticeable for Escherichia coli and the result was attributed to both, E. coli outer envelope which might lower the efficacy of HDMTA + adsorbed on the MMT, and decreasing silver proportions when the surfactant loading increased. MH1-Ag presented the best bactericidal properties, showing synergistic effects against S. aureus, while maintaining activity against E. coli compared to MMT-Ag. Understanding MMT-HDMTA-Ag efficacy contributes to the design of new antimicrobial materials for potential applications in health care.

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Charge Steering in Heterojunction Photocatalysis: General Principles, Design, Construction, and Challenges

Eshete

et al. 2023

Small Science

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Steering charge kinetics is a key to optimizing quantum efficiency. Advancing the design of photocatalysts (ranging from single semiconductor to multicomponent semiconductor junctions) that promise improved photocatalytic performance for converting solar to chemical energy, entails mastery of increasingly more complicated processes. Indeed, charge kinetics become more complex as both charge generation and charge consumption may occur simultaneously on different components, generally with charges being transferred from one component to another. Capturing detailed charge dynamics information in each heterojunction would provide numerous significant benefits for applications and has been needed for a long time. Here, the steering of charge kinetics by modulating charge energy states in the design of semiconductor–metal‐interface‐based heterogeneous photocatalysts is focused. These phenomena can be delineated by separating heterojunctions into classes exhibiting either Schottky/ohmic or plasmonic effects. General principles for the design and construction of heterojunction photocatalysts, including recent advances in the interfacing of semiconductors with graphene, carbon quantum dots, and graphitic carbon nitride are presented. Their limitations and possible future outlook are brought forward to further instruct the field in designing highly efficient photocatalysts.

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Synthesis of Ag3PO4–AgBr with a novel heterostructure, and its photocatalytic properties

Cited by 15 publications

References 24 publications

Maximizing Property Tuning of Phosphorus Corrole Photocatalysts through a Trifluoromethylation Approach

Maximizing Property Tuning of Phosphorus Corrole Photocatalysts through a Trifluoromethylation Approach

Correlating Antimicrobial activity and Structure in Montmorillonite modified with Hexadecyltrimethylammonium and Silver

Charge Steering in Heterojunction Photocatalysis: General Principles, Design, Construction, and Challenges

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