Native defects in silver orthophosphate and their effects on photocatalytic activity under visible light irradiation

Sulaeman, Uyi; Hermawan, Dadan; Andreas, Roy; Abdullah, Ahmad Zuhairi; Yin, Shu

doi:10.1016/j.apsusc.2017.09.188

Cited by 29 publications

(20 citation statements)

References 41 publications

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“…Besides the metallic Ag dopant, the defect generated in photocatalyst could dramatically enhance catalytic activity. Based on a previous result [9], the coprecipitation under mixed water-ethanol solution generates the silver vacancy defect. This defect significantly increases catalytic activity.…”

Section: ■ Introductionmentioning

confidence: 80%

“…The photocatalytic activities were evaluated based on Rhodamine B (RhB) degradation under blue light irradiation [9]. A total of 0.1 g of catalyst was added to 100 mL of RhB solution (10 mg/L) in a beaker glass.…”

Section: Photocatalytic Activitymentioning

confidence: 99%

“…3 displays the photocatalytic activity of SP and DMSP. The rates of photocatalytic activity were evaluated using the pseudo-first-order kinetics with the equation of ln(C 0 /C t ) = kt, where C 0 and C t are the dye concentration at time 0 and t, respectively, and k is the rate constant (min -1 ) [9]. When the linear of ln(C 0 /C t ) vs. t is obtained, the reaction fitted with this model.…”

Section: Figmentioning

confidence: 99%

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Design of Defect and Metallic Silver in Silver Phosphate Photocatalyst Using the Hydroxyapatite and Glucose

et al. 2020

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The defect and metallic silver (Ag) in silver phosphate (Ag3PO4) photocatalyst were successfully generated using hydroxyapatite (HA) and glucose. Two steps of synthesis were done in these experiments. Firstly, the Ag/HA powder was prepared by reacting AgNO3 and HA, followed by the addition of a glucose solution. Secondly, the suspension of Ag/HA was reacted with AgNO3 aqueous solution. The yellow product of Ag/Ag3PO4 photocatalyst was produced. The products were characterized using X-Ray Diffraction (XRD), Diffuse Reflectance Spectroscopy (DRS), Scanning Electron Microscope (SEM), Brunauer–Emmett–Teller (BET) and X-ray Photoelectron Spectroscopy (XPS). The decreased ratio of O/Ag and metallic Ag formation observed by the XPS was detected as the possible defect and Ag-doping in the photocatalyst. The enhanced photocatalytic activity might be caused by the oxygen vacancy and metallic Ag in Ag3PO4 that enables the separation of photo-generated electrons and holes.

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Section: ■ Introductionmentioning

confidence: 80%

Section: Photocatalytic Activitymentioning

confidence: 99%

Section: Figmentioning

confidence: 99%

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Design of Defect and Metallic Silver in Silver Phosphate Photocatalyst Using the Hydroxyapatite and Glucose

et al. 2020

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“…The Ag 3d 5/2–3/2 , C 1s, and O 1s spectra were fitted to Gaussian–Lorentzian asymmetric components after Tougaard inelastic background subtraction [ 38 ] using the XPSPeakfit software [ 43 ]. The following binding energy (BE) values for Ag 3d 5/2 spectrum were considered in the fitting procedure of Ag 3d 5/2–3/2 spectra to determine the surface content of Ag chemical states: 367.8 eV for Ag 3 PO 4 [ 44 , 45 ]; 368.1 eV for AgCl [ 46 ]; 368.3 eV for Ag met [ 47 , 48 ]; and 367.3 eV for Ag oxidized structures such as Ag 2 O, AgO, AgOH [ 47 , 48 ]. The fitting proceeded with constant ratios of full width at half maximum (FWHM) for different Ag phases.…”

Section: Resultsmentioning

confidence: 99%

Valorization of Brewery Wastes for the Synthesis of Silver Nanocomposites Containing Orthophosphate

et al. 2021

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Brewery wastes from stage 5 (Wort precipitate: BW5) and stage 7 (Brewer’s spent yeast: BW7) were valorized for the synthesis of silver phosphate nanocomposites. Nanoparticles were synthesized by converting silver salt in the presence of brewery wastes at different temperatures (25, 50, and 80 °C) and times (10, 30, and 120 min). Unexpectedly, BW7 yielded Ag3PO4 nanoparticles with minor contents of AgCl and Ag metal (Agmet). Contrastingly, BW5 produced AgCl nanoparticles with minor amounts of Ag3PO4 and Agmet. Nanocomposites with different component ratios were obtained by simply varying the synthesis temperature and time. The morphology of the nanocomposites contained ball-like structures representative of Ag3PO4 and stacked layers and fused particles representing AgCl and Agmet. The capping on the nanoparticles contained organic groups from the brewery by-products, and the surface overlayer had a rich chemical composition. The organic overlayers on BW7 nanocomposites were thinner than those on BW5 nanocomposites. Notably, the nanocomposites exhibited high antibacterial activity against Escherichia coli ATCC 25922. The antibacterial activity was higher for BW7 nanocomposites due to a larger silver phosphate content in the composition and a thin organic overlayer. The growth of Agmet in the structure adversely affected the antimicrobial property of the nanocomposites.

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“…Besides the incorporation of Au on the surface of Ag3PO4, the defect formation on Ag3PO4 can enhance the photocatalytic properties. The defect sites on Ag3PO4 can be initiated under ethanol-water coprecipitation [22]. These defects lead to enhance absorption in the visible region resulting in high photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

The Surface Modification of Ag3PO4 using Tetrachloroaurate(III) and Metallic Au for Enhanced Photocatalytic Activity

Sulaeman

Permadi

Marcorius

et al. 2021

Bull. Chem. React. Eng. Catal.

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The improvement of Ag3PO4 photocatalytic activity was successful by incorporating tetrachloroaurate(III) (AuCl4−) and metallic Au on the surface of Ag3PO4. The photocatalysts were synthesized using the coprecipitation and chemisorption method. Coprecipitation of Ag3PO4 was carried out under ethanol-water solution using the starting material of AgNO3 and Na2HPO4.12H2O. AuCl4− ion and metallic Au were incorporated on the surface of Ag3PO4 using a chemisorption method under auric acid solution. The photocatalysts were characterized using XRD, DRS, SEM, and XPS. The AuCl4− ion and metallic Au were simultaneously incorporated on the Ag3PO4 surface. The high photocatalytic activity might be caused by increasing the separation of hole and electron due to capturing photogenerated electrons by metallic Au and Au(III) as electron acceptors. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Native defects in silver orthophosphate and their effects on photocatalytic activity under visible light irradiation

Cited by 29 publications

References 41 publications

Design of Defect and Metallic Silver in Silver Phosphate Photocatalyst Using the Hydroxyapatite and Glucose

Design of Defect and Metallic Silver in Silver Phosphate Photocatalyst Using the Hydroxyapatite and Glucose

Valorization of Brewery Wastes for the Synthesis of Silver Nanocomposites Containing Orthophosphate

The Surface Modification of Ag3PO4 using Tetrachloroaurate(III) and Metallic Au for Enhanced Photocatalytic Activity

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