Synthesis of AgBr/Ag4P2O7 composite photocatalyst and enhanced photocatalytic performance

Photochem & Photobiology

Zhang

2018

Self Cite

Novel AgCl/Ag PO photocatalysts were synthesized by a simple precipitation method, in which AgCl was coated onto Ag PO particles, as uncovered by X-ray diffractometry, transmission electron microscopy and ultraviolet-visible spectrometry. Different from previous research on photocatalytic degradation, we studied the performance of methyl orange photodegradation on a small continuous flow reactor. The highest degradation activity of 97% was achieved by the 2 wt.% AgCl/Ag PO after 8 min of visible light irradiation, while pure Ag PO degraded only 71% methyl orange under same conditions. The degradation rate constant of the 2 wt.% AgCl/Ag PO was 1.36 times higher than that of pure Ag PO . The AgCl/Ag PO maintained high photocatalytic activity after five cycles, without any significant decrease.

“…In comparison, the DMPO‐

\cdot

AgCl / {Ag}_{3} {PO}_{4} + h v \to {normalh}^{+} + {normale}^{-}

{normalO}_{2} + 2 {normalH}^{+} + 2 {normale}^{-} \to {normalH}_{2} {normalO}_{2} \to^{∙} OH

^{∙} OH + MO \to {CO}_{2} + {normalH}_{2} O

…”

Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Synthesis of AgCl/Ag₃PO₄ Composite Photocatalysts and Study on Photodegradation Activity Based on a Continuous Reactor

Zhao

Photochem & Photobiology

Zhang

2018

Self Cite

“…Moreover, H 2 O 2 formed in both reduction and oxidation processes in the photocatalytic reaction is also a very important factor for the photocatalytic mechanism. Table presents the H 2 O 2 concentrations during MO photodegradation, which were measured using a potassium titanium oxalate colorimetric method . The H 2 O 2 content increases at regular intervals, suggesting H 2 O 2 is photoinduced by e − to give • OH.…”

Section: Resultsmentioning

confidence: 99%

“…through doping, coupling, sensitization) and exploitation of novel promising photocatalysts . In particular, construction of heterostructures from the combination of two semiconductors with matching band potentials is a flexible and effective modification strategy for broadening the visible‐light absorption of photocatalysts, examples being Ag 3 PO 4 /TiO 2 , Ag 3 PO 4 /AgVO 3 , AgBr/Ag 4 P 2 O 7 and AgBr/BiOBr . Their high photocatalytic activities are ascribed to the expanded responsive spectral range and reduced probability of recombination of photogenerated electrons and holes …”

Section: Introductionmentioning

confidence: 99%

Preparation of high‐activity AgBr/Ag₃PO₄ photocatalyst based on hexadecyltrimethylammonium bromide and mechanism of photocatalytic enhancement

Zhang

2018

Applied Organom Chemis

Self Cite

A high‐activity AgBr/Ag3PO4 heterojunction photocatalyst was synthesized based on hexadecyltrimethylammonium bromide. Its microspheres were characterized using X‐ray diffractometry, transmission electron microscopy and ultraviolet–visible diffuse reflectance spectroscopy. The new photocatalyst with high photocatalytic activity exceptionally outperforms pure Ag3PO4 and AgBr in methyl orange degradation. The enhancement of photocatalytic activity is attributed to the efficient separation of electron–hole pairs. In this photocatalytic reaction, h+ and •O2− are the main reactive species that induce visible‐light‐driven degradation.

“…According to the contents of H 2 O 2 and •OH, we postulate the possible photocatalysis mechanism as follows:

\begin{matrix} lefttrue \\ {normalC}_{60} / {Ag}_{3} {PO}_{4} + hv \to {normalh}^{+} + {normale}^{-} \\ {normalO}_{2} + {normalH}^{+} + 2 {normale}^{-} \to {normalH}_{2} {normalO}_{2} \\ {normalH}_{2} {normalO}_{2} + {normale}^{-} \to • OH \\ • OH + MO \to {CO}_{2} + {normalH}_{2} O \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

Enhanced photocatalytic activity of Ag₃PO₄ via Fullerene C₆₀ modification

Yang

Chen

et al. 2018

Applied Organom Chemis

Self Cite

Fullerene‐C60‐modified Ag3PO4 photocatalysts (C60/Ag3PO4) were prepared via facile chemical precipitation. The structures, morphology and photocatalytic properties of C60/Ag3PO4 were characterized by X‐ray diffractometry (XRD), transmission electron microscopy (TEM), photoluminescence (PL) spectrometry, and ultraviolet–visible (UV–vis) absorption spectrometry. C60/Ag3PO4 exhibits considerably higher photocatalytic activity for degradation of Methyl Orange. The degradation conversion reached 93% after 8 min of light irradiation. Besides, the enhancement of photocatalytic activity could be attributed to the active species •OH, which can be ascribed to strong synergistic effect between Fullerene C60 and Ag3PO4.