Abstract:A novel Ag/Bi3O4Cl photocatalyst has been synthesized by a facile photodeposition process. The Ag/Bi3O4Cl photocatalyst exhibited excellent photocatalytic activity for the degradation of tetracycline.
“…In order to better investigate the photocatalytic mechanism of PBA-50, the role of the main active radicals was explored through free radical capture experiments by adding TBA, EDTA-2Na, and BQ capture agents to remove OH, h + , and O 2 − , respectively. 42 It can be seen from Fig. 13 that the degradation efficiency of RhB was slightly reduced from 98% to 72.5% with the addition of TBA, suggesting that •OH was only a secondary effect.…”
Section: Possible Photocatalytic Mechanismmentioning
BACKGROUND: The commonly used RhB dye is a carcinogen that is widely found in environmental matrices and poses a threat to aquatic biota and human health. However, conventional wastewater treatment processes do not effectively remove low concentrations of these pollutants. Herein, the P-Bi 4 O 5 Br 2 /AgI (PBA) heterojunction was synthesized via a polyvinylpyrrolidone (PVP)-assisted solvothermal and precipitation method in this work.
RESULTS:The photocatalytic efficiency of the PBA heterojunction was evaluated by degrading rhodamine B (RhB) with the irradiation of simulated sunlight. P-Bi 4 O 5 Br 2 /AgI-50 (PBA-50, the mass fraction of AgI in the composite was 50%) composite could degrade 98% RhB under 90 min irradiation of 500 W Xenon lamp, and its pseudo first-order reaction rate constant was 0.04265 min −1 , which was 17.1, 2.16, and 2.94 times higher than that of Bi 4 O 5 Br 2 , P-Bi 4 O 5 Br 2 , and AgI, respectively. Besides, the effects of the dosage of photocatalyst and the anion on the photocatalytic degradation of RhB over PBA-50 were analyzed.
CONCLUSION:The enhanced photocatalytic activity of PBA was attributed to its better visible light capture ability, larger specific surface area, and faster photogenerated carrier separation efficiency, all of which were confirmed by scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), UV-Vis diffues reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), and photoelectrochemical analysis. In addition, the free radical trapping experiments confirmed that •O 2 − and h + were the main active species for degradation of RhB. Additionally, the smaller bandgap and the more negative conduction band position of Bi 4 O 5 Br 2 were reached after the introduction of PVP. Accordingly, a possible type-II heterojunction photocatalytic mechanism of P-Bi 4 O 5 Br 2 /AgI was proposed.
“…In order to better investigate the photocatalytic mechanism of PBA-50, the role of the main active radicals was explored through free radical capture experiments by adding TBA, EDTA-2Na, and BQ capture agents to remove OH, h + , and O 2 − , respectively. 42 It can be seen from Fig. 13 that the degradation efficiency of RhB was slightly reduced from 98% to 72.5% with the addition of TBA, suggesting that •OH was only a secondary effect.…”
Section: Possible Photocatalytic Mechanismmentioning
BACKGROUND: The commonly used RhB dye is a carcinogen that is widely found in environmental matrices and poses a threat to aquatic biota and human health. However, conventional wastewater treatment processes do not effectively remove low concentrations of these pollutants. Herein, the P-Bi 4 O 5 Br 2 /AgI (PBA) heterojunction was synthesized via a polyvinylpyrrolidone (PVP)-assisted solvothermal and precipitation method in this work.
RESULTS:The photocatalytic efficiency of the PBA heterojunction was evaluated by degrading rhodamine B (RhB) with the irradiation of simulated sunlight. P-Bi 4 O 5 Br 2 /AgI-50 (PBA-50, the mass fraction of AgI in the composite was 50%) composite could degrade 98% RhB under 90 min irradiation of 500 W Xenon lamp, and its pseudo first-order reaction rate constant was 0.04265 min −1 , which was 17.1, 2.16, and 2.94 times higher than that of Bi 4 O 5 Br 2 , P-Bi 4 O 5 Br 2 , and AgI, respectively. Besides, the effects of the dosage of photocatalyst and the anion on the photocatalytic degradation of RhB over PBA-50 were analyzed.
CONCLUSION:The enhanced photocatalytic activity of PBA was attributed to its better visible light capture ability, larger specific surface area, and faster photogenerated carrier separation efficiency, all of which were confirmed by scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), UV-Vis diffues reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), and photoelectrochemical analysis. In addition, the free radical trapping experiments confirmed that •O 2 − and h + were the main active species for degradation of RhB. Additionally, the smaller bandgap and the more negative conduction band position of Bi 4 O 5 Br 2 were reached after the introduction of PVP. Accordingly, a possible type-II heterojunction photocatalytic mechanism of P-Bi 4 O 5 Br 2 /AgI was proposed.
“…Jiang and co-workers synthesized a novel Ag/Bi 3 O 4 Cl photocatalyst with different amounts of Ag via a facile photo-deposition process [79] . The TC degradation on 1.0 wt% Ag/Bi 3 O 4 Cl was drastically more pronounced, compared to pristine Bi 3 O 4 Cl, and 94.2% TC could be degraded in 120 min ( Fig.…”
Section: Strategies For Photocatalytic Activity Improvementmentioning
confidence: 99%
“… Fig. 7 (a) Photodegradation of TC by the as-synthesized plasmonic Ag/Bi 3 O 4 Cl under visible irradiation, (b) possible photocatalytic mechanisms on the Ag/Bi 3 O 4 Cl samples [79] , (c) photocatalytic kinetics of prepared g-C 3 N 4 , Pt/g-C 3 N 4 , Au/g-C 3 N 4 , and Au/Pt/g-C 3 N 4 nanocomposites [86] (d) schematic of the g-C 3 N 4 photoinduced charge transport [284] …”
Section: Strategies For Photocatalytic Activity Improvementmentioning
“…9,10 Over the past few decades, dispersing noble metal nanoparticles (NPs) such as Pt, Au and Ag onto semiconductors has emerged as an efficient method to improve the photocatalytic activity of semiconductors. [11][12][13][14] As an important low-cost metal, Cu NPs can provide active centers with great promise in catalysis that are expected to be an alternative material for the replacement of noble metals. [15][16][17][18][19][20] A few reports have elaborated that the addition of Cu NPs can promote photocatalytic activity of semiconductors due to the localized surface plasmon resonance (LSPR) effect.…”
The photocatalytic degradation activity and photoelectrochemical performance of amorphous BaTiO3 films can be improved after introducing Cu NPs, and the oxidation of Cu is strongly hindered when dispersing in the amorphous BaTiO3 films that serve as h+-trapping centers.
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