AgBr/Al-MCM-41 visible-light photocatalyst for gas-phase decomposition of CH3CHO

Rodrigues, Shalini; Uma, S.; Martyanov, Igor N.; Klabunde, Kenneth J.

doi:10.1016/j.jcat.2005.05.011

Cited by 79 publications

(35 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In accordance, the Si and Fe contents were found to be 30.0 and 19.1 wt.%, respectively. Other research indicated that the silica content in TiO 2 /SiO 2 / c-Fe 2 O 3 was only 1.9 wt.% (the mass ratio between TiO 2 and silicacoated SiO 2 /c-Fe 2 O 3 was 1:1) even though the incomplete SiO 2 membrane still improved the photocatalytic efficiency (Rodrigues et al, 2005). This indicates the existence of a SiO 2 mid-layer in Ag/AgBr/SFN will help to restrain the adverse effect of charge carrier recombination as well.…”

Section: à2mentioning

confidence: 98%

“…Others (Zou et al, 2001;Kim et al, 2004;Fu et al, 2005) have reported interesting work on efficient utilizing of visible light by employing non-titania photocatalyst. Moreover, the use of silver halides such as AgBr, a series of photosensitive materials for photography, emerges to be capable of inactivating pathogenic material and destruction of azo dye under visible light (Rodrigues et al, 2005;Hu et al, 2006;Elahifard et al, 2007;Lan et al, 2007;Zang and Farnood, 2008). However, there are few studies on the immobilization of these typical nontitania photocatalyst on magnetic support for decontamination under visible light so far.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Degradation of Acid Orange 7 using magnetic AgBr under visible light: The roles of oxidizing species

et al. 2009

View full text Add to dashboard Cite

a b s t r a c tAgBr was creatively immobilized on a magnetic substrate (SiO 2 -coated Fe 3 O 4 nanoparticle, SFN) to achieve magnetic separation after visible light-driven photocatalytic oxidation (PCO). The resulted Ag/ AgBr/SFN was characterized by TEM, vibrating sample magnetometer and other techniques. It is found that the average diameter of the Ag/AgBr/SFN particle is less than 20 nm. The typical superparamagnetic behavior of Ag/AgBr/SFN implies that the catalyst can be magnetically separated. The physicochemical features of the used Ag/AgBr/SFN after visible light irradiation were not dramatically changed by X-ray diffraction, UV-Vis diffuse reflectance spectra and Fourier transform-infrared analysis. SiO 2 interlayer was proven to slightly increase the degradation efficiency for an azo dye Acid Orange 7. UV-Vis spectra and HPLC analysis indicated that the dye was oxidized and decomposed. The photoactivity of Ag/AgBr/ SFN was partly maintained after successive PCO under visible light. In order to evaluate the roles of e À -h + pairs and reactive oxygen species, the quenching effect was examined by employing Ag/AgBr/ SFN and commercial TiO 2 (P-25) under visible light (k > 400 nm) and UV-A irradiation, respectively. Active h + and the resulting Å OH played the major roles for degradation. The effect of active h + and Å OH were proven to be highly dependent on the concentration of photocatalysts. The effect of Å OH was more obvious for P-25, while that of active h + was more predominant for Ag/AgBr/SFN.

show abstract

Section: à2mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Degradation of Acid Orange 7 using magnetic AgBr under visible light: The roles of oxidizing species

et al. 2009

View full text Add to dashboard Cite

show abstract

“…18 Also, AgBr was well-dispersed on an Al-MCM-41 support and was investigated as a visible light photocatalyst for the decomposition of acetaldehyde in the gas phase. 19 In these two reaction systems, AgBr shows high stability and photocatalytic activity. However, to date, there is no evidence nor reasonable explanation for these performances of AgBr.…”

Section: Introductionmentioning

confidence: 99%

Ag/AgBr/TiO₂ Visible Light Photocatalyst for Destruction of Azodyes and Bacteria

et al. 2006

View full text Add to dashboard Cite

was prepared by the deposition-precipitation method and was found to be a novel visible light driven photocatalyst. The catalyst showed high efficiency for the degradation of nonbiodegradable azodyes and the killing of Escherichia coli under visible light irradiation (λ > 420 nm). The catalyst activity was maintained effectively after successive cyclic experiments under UV or visible light irradiation without the destruction of AgBr. On the basis of the characterization of X-ray diffraction, X-ray photoelectron spectroscopy, and Auger electron spectroscopy, the surface Ag species mainly exist as Ag 0 in the structure of all samples before and after reaction, and Ag 0 species scavenged h VB + and then trapped e CB -in the process of photocatalytic reaction, inhibiting the decomposition of AgBr. The studies of ESR and H 2 O 2 formation revealed that • OH and O 2•-were formed in visible light irradiated aqueous Ag/AgBr/TiO 2 suspension, while there was no reactive oxygen species in the visible light irradiated Ag 0 /TiO 2 system. The results indicate that AgBr is the main photoactive species for the destruction of azodyes and bacteria under visible light. In addition, the bactericidal efficiency and killing mechanism of Ag/AgBr/TiO 2 under visible light irradiation are illustrated and discussed.

show abstract

“…Recently, a silver bromide emulsion dispersed on silica support has been studied in the CH 3 OH/H 2 O solution for H 2 evolution under UV illumination [16]. Also, AgBr dispersed on Al-MCM-41 showed high visible light activity for the decomposition of acetaldehyde in gas phase [17]. In a previous study, we reported the preparation and the activity and stability mechanism of AgBr/TiO 2 for the destruction of azo dyes and Escherichia coli [18].…”

Section: Introductionmentioning

confidence: 99%

Efficient destruction of pathogenic bacteria with AgBr/TiO2 under visible light irradiation

Lan

et al. 2007

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

The photocatalytic inactivation of pathogenic bacteria in water was investigated systematically with AgBr/TiO 2 under visible light (l > 420 nm) irradiation. The catalyst was found to be highly effective for the killing of Escherichia coli, a Gram-negative bacterium, and Staphylococcus aureus, a Gram-positive bacterium. The decomposition of the cell wall and cell membrane was directly observed by TEM and further confirmed by K + leakage from the inactivated bacteria. A possible cell damage mechanism by visible light-driven AgBr/TiO 2 is proposed. In addition, the effects of pH, inorganic ions on bacterial photocatalytic inactivation were investigated. The electrostatic force interaction of the bacteria-catalyst is crucial for the efficiency of disinfection. Moreover, AgBr/TiO 2 supported on porous nickel showed much higher bactericidal activity than fixed P25 TiO 2 under visible or near UV light irradiation. #

show abstract

AgBr/Al-MCM-41 visible-light photocatalyst for gas-phase decomposition of CH3CHO

Cited by 79 publications

References 22 publications

Degradation of Acid Orange 7 using magnetic AgBr under visible light: The roles of oxidizing species

Degradation of Acid Orange 7 using magnetic AgBr under visible light: The roles of oxidizing species

Ag/AgBr/TiO₂ Visible Light Photocatalyst for Destruction of Azodyes and Bacteria

Efficient destruction of pathogenic bacteria with AgBr/TiO2 under visible light irradiation

Contact Info

Product

Resources

About

AgBr/Al-MCM-41 visible-light photocatalyst for gas-phase decomposition of CH3CHO

Cited by 79 publications

References 22 publications

Degradation of Acid Orange 7 using magnetic AgBr under visible light: The roles of oxidizing species

Degradation of Acid Orange 7 using magnetic AgBr under visible light: The roles of oxidizing species

Ag/AgBr/TiO2 Visible Light Photocatalyst for Destruction of Azodyes and Bacteria

Efficient destruction of pathogenic bacteria with AgBr/TiO2 under visible light irradiation

Contact Info

Product

Resources

About

Ag/AgBr/TiO₂ Visible Light Photocatalyst for Destruction of Azodyes and Bacteria