The effect of different molar ratios of ZnO on characterization and photocatalytic activity of TiO2/ZnO nanocomposite

Moradi, Sajad; Azar, Parviz Aberoomand; Farshid, Sanaz Raeis; Abedini-Khorrami, Saeed; Givianrad, Mohammad Hadi

doi:10.1016/j.jscs.2012.08.002

Cited by 79 publications

(34 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This behavior was evident in the composites synthesized in our work. Several studies have shown that the increase in the ratio of Zn with respect to TiO 2 did not result in increased in photocatalytic efficiency [6,7,55,56]. According to Zhao et al, the excess Zn associated with TiO 2 can lead to excessive formation of surface oxygen vacancy, which act as electron traps and thus slow the electronic transfers, thereby reducing photocatalytic activity [57].…”

Section: X-ray Diffractionmentioning

confidence: 99%

Enhanced photocatalytic activity of TiO2-impregnated with MgZnAl mixed oxides obtained from layered double hydroxides for phenol degradation

Almeida

Bellato

Mounteer

et al. 2015

Applied Surface Science

View full text Add to dashboard Cite

Highlight► The catalysts composite TiO 2 /MgZnAl-5, was more efficient than TiO 2 P25.► The effects of different molar ratios zinc on the photocatalysts were investigated.► Synergistic effect between constituents of TiO 2 /MgZnAl-5 increases the photocatalysis.► TiO 2 /MgZnAl-5 exhibited the adsorption of light displacing the greater wavelength.► The catalyst composite TiO 2 /MgZnAl-5 can be reused for five consecutive cycles. AbstractPage 2 of 34 A c c e p t e d M a n u s c r i p t 2 A series of TiO 2 /MgZnAl photocatalysts, were successfully synthesized from ternary (Mg, Zn and Al) layered double hydroxides impregnated with TiO 2 nanoparticles by the co-precipitation method at variable pH with different Zn 2+ /Mg 2+ molar ratios . The composite photocatalysts were calcined at 500 °C resulting in the incorporation of oxide zinc, in the calcined MgZnAl LDH structure. Synergistic effect between ZnO and TiO 2 lead to significant enhancement of TiO 2 /MgZnAl photocatalytic activity. Composite photocatalysts were characterized by ICP-MS, N 2 adsorption/desorption, XRD, SEM, EDS, IR and UV-Vis DRS. Phenol in aqueous solution (50 mg/L) was used as a model compound for evoluation of UV-Vis (filter cutoff for λ > 300 nm) photocatalytic activity . The most efficient phocatalyst composite was obtained at a 5% Zn 2+ /Mg 2+ molar ratio , in the catalyst identified as TiO 2 /MgZnAl-5. This composite catalyst had high photocatalytic activity, completely destroying phenol and removing 80% of total organic carbon in solution after 360 min.The TiO 2 /MgZnAl-5 catalyst remained relatively stable, presenting a 15% decrease in phenol degradation efficiency after five consecutive photocatalytic cycles.

show abstract

Section: X-ray Diffractionmentioning

confidence: 99%

Enhanced photocatalytic activity of TiO2-impregnated with MgZnAl mixed oxides obtained from layered double hydroxides for phenol degradation

Almeida

Bellato

Mounteer

et al. 2015

Applied Surface Science

View full text Add to dashboard Cite

show abstract

“…Among those methods researchers choose coupling of two/more semiconductors metal oxides having related band gaps such as: TiO 2 /ZnO [6], SnO 2 /ZnO [7], SnO 2 /ZnO/TiO 2 [8], and different including: ZnO/γ-Mn 2 O 3 [9], Mn 3 O 4 -ZnO [10], ZnO-MnO 2 -Cu 2 O [11], ZnO/CdS/Ag 2 S [12], Ag 3 PO 4 /ZnFe 2 O 4 /ZnO [13], Co 3 O 4 /ZnO [14], ZnO/ZnFe 2 O 4 [15] [16], ZnO/Fe 2 O 3 & TiO 2 /Fe 2 O 3 [17] for preventing the electron-hole recombination and inducing visible light. In addition to this, coupling of bare metal oxide with its doped complements (e.g.…”

Section: Introductionmentioning

confidence: 99%

Summary on Adsorption and Photocatalysis for Pollutant Remediation: Mini Review

Abebe¹,

Murthy²,

Zereffa³

2018

JEAS

116

View full text Add to dashboard Cite

Adsorption and photo catalysis are the most popular methods applied for the reduction of amount of pollutants that enter water bodies. The main challenge in the process of adsorption is the demonstration of the experimental data obtained from sorption processes. For many decades most of the researchers used adsorption and kinetic of adsorption as a repetitive work to describe the adsorption data by using common models such as, Langmuir and Freundlich for adsorption isotherms; PFO and PSO models for kinetics. This has been done without careful evaluation of the characteristics of adsorption process. It has been well understood that adsorption does not degrade the pollutant to eco-friendly products and photo catalysis will not degrade without adsorption of the pollutant on the catalyst. Therefore, understanding the detailed mechanism of adsorption, as well as, photo catalysis has been presented in this paper. During photo catalysis: modification towards suppression of electron-hole recombination, improving visible light response, preventing agglomeration, controlling the shape, size, morphology, etc. are the most important steps. This mini review also widely discusses the key points behind adsorption and photo catalysis.

show abstract

“…γ-Al 2 O 3 and TiO 2 have been produced by various methods, such as sol-gel, co-precipitation, and hydrothermal treatment. Doping metals can play important roles in the structural properties of the composite, especially in the porous structure 8,12,13,14,15,16,17 .…”

Section: Introductionmentioning

confidence: 99%

“…The new sol-gel was uniformed by a homogenizer and heated in two steps: first by applying thermal shock at 350 ο C for 20 min. and then by calcinating at 500 ο C for 5 h to prepare the TiO 2 / γ-Al 2 O 3 core shell 13,15,18 .…”

Section: Introductionmentioning

confidence: 99%

Resistant in Alkaline Media Core-Shell Photocatalyst of Fe (TiO2/ Al2O3) for Degradation of Water Pollutant

Haghighaty¹,

Dehaghi²

2018

Orient. J. Chem

View full text Add to dashboard Cite

In this research, initially after preparing γ-alumina and Fe(III) doped γ-alumina prepared by the sol-gel method, the initial calcination of the sols was carried out for 3 h at 300 o C and the obtained pulverized solid crystals were added into two sol-gel containers consisting of titanium tetra iso-propoxide (TTiP) and Fe(III) doped TTiP . After homogenization, the new sol was for 24 h and calcinated for 4 h at 600 o C. After the process of washing and purification, the core-shells were prepared and characterized. The photocatalytic properties were compared to those of the pure TiO 2 , which had been prepared by the sol-gel method. Some of the properties of these new synthesized particles include increased effective surface area of TiO 2 intake feed, increased activity of photocatalytic properties in terms of the alkaline pH, and enhanced strength of the core shell particles in the process of mechanical separation during the reactivation steps up to 10 times of recovery. Photocatalytic activity was examined by degradation of methylen blue. Doping Fe (III) in the core of γ-alumina, increased the mechanical stability while doping Fe (III) in the TiO 2 shell decreased the time of degradation and increased the stability of the catalyst in an alkaline solution to a pH of about 12.

show abstract

The effect of different molar ratios of ZnO on characterization and photocatalytic activity of TiO2/ZnO nanocomposite

Cited by 79 publications

References 29 publications

Enhanced photocatalytic activity of TiO2-impregnated with MgZnAl mixed oxides obtained from layered double hydroxides for phenol degradation

Enhanced photocatalytic activity of TiO2-impregnated with MgZnAl mixed oxides obtained from layered double hydroxides for phenol degradation

Summary on Adsorption and Photocatalysis for Pollutant Remediation: Mini Review

Resistant in Alkaline Media Core-Shell Photocatalyst of Fe (TiO2/ Al2O3) for Degradation of Water Pollutant

Contact Info

Product

Resources

About