Preparation and Visible Light Photocatalytic Activties of Hollow Nanospheres of Ag+/Ag-TiO2

doi:10.11901/1005.3093.2014.300

Chinese Journal of Materials Research

2014, Vol. 28

Issue (11): 865-872 DOI: 10.11901/1005.3093.2014.300

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Preparation and Visible Light Photocatalytic Activties of Hollow Nanospheres of Ag⁺/Ag-TiO₂

Liping SHI¹,Chun LIU^1,^2,^**(

),Hengbo YIN²,Aili WANG²,Lijun WANG¹

1. College of Chemistry and Biology, Beihua University, Jilin 132013
2. Faculty of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013

Cite this article:

Liping SHI,Chun LIU,Hengbo YIN,Aili WANG,Lijun WANG. Preparation and Visible Light Photocatalytic Activties of Hollow Nanospheres of Ag⁺/Ag-TiO₂. Chinese Journal of Materials Research, 2014, 28(11): 865-872.

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Abstract

Hollow nanospheres of Ag⁺/Ag-TiO₂(Ag⁺/Ag-HTS) were synthesized by a two step process i.e. firstly Ag₂S was deposited on the surface of TiO₂/polystyrene composites and subsequently the decorated composites were calcinated in air. The results show that all of the Ag⁺/Ag-HTS have good visible light photocatalytic activities for the photodegradation of methyl orange. It possesses a high efficiency for photodegradation of methyl orange as the solutions with low concentration of methyl orange. The presence of Schottky barrier may facilitate the migration of vacancies to the surface of Ag⁺/Ag-HTS and thereby enhance its photocatalytic efficiency. Ag⁺in the catalyst is helpful to scavenge photoelectrons to prevent the recombination of electrons and vacancies. The photocatalytic activity of the Ag⁺/Ag-HTS increases with the increase of the amount of deposited Ag₂S in the first step of synthesis process. The degradation of methyl orange by Ag⁺/Ag-modified hollow titania nanosphere photocatalysts fitted the pseudo-first-order kinetics. When the mass ratio of Ag₂S to TiO₂ was 25%, the photodegradation efficiency for methyl orange was up to 70.6% under visible light irradiation for 2 h.

Key words: composites visible light photocatalysis Schottky barrier wet chemical deposition method hollow titania nanosphere

Received: 26 June 2014

Fund: *Supported by Science and Technology Development Plan of Jilin Province No. 201105042, and The Twelfth Five Year Plan Projects of Jilin Province Education Department Nos. 2011140 & 2014187.

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	Liping SHI
	Chun LIU
	Hengbo YIN
	Aili WANG
	Lijun WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.300 OR https://www.cjmr.org/EN/Y2014/V28/I11/865

Table 1 Relative amount of Ag₂SO₄ of various Ag⁺/Ag-HTS samples (mass fraction)

Table 2 Weight ratios of TiO₂ phases in Ag⁺/Ag-HTS samples

Fig.1 Powder XRD patterns of the as-prepared Ag⁺/Ag-HTS samples

Fig.2 SEM images of PSM, HTS, and Ag⁺/Ag-HTS samples, (a) PSM, (b) 0%Ag⁺/Ag-HTS, (c) 10%Ag⁺/Ag-HTS, (d) 15%Ag⁺/AG-HTS, (e) 20%Ag⁺/Ag-HTS, (f) 25%Ag⁺/Ag-HTS

Fig.3 Diffuse reflectance spectra of the as-prepared HTS and Ag⁺/Ag-HTS samples; Inset: plot of the square root of the modified Kubelka-Munck function vs. the energy of the exciting light (P25)

Fig.4 Plots of the square root of the modified Kubelka-Munck functions vs. the energy of the exciting light; Inset: plots of the diffuse reflectance spectra of the as-prepared HTS and Ag⁺/Ag-HTS samples

Fig.5 Photodegradation of MO (5-20 mg·L^-1) in the presence of Ag⁺/Ag-HTS, HTS and P25 photocatalysts under visible light irradiation (Tungsten Lamp, 500 W)

Fig.6 Poltting of ln(c/c₀) vs t under different initial MO concentrations

Fig.7 Schematic illustration of the photocatalytic reaction by Ag⁺/Ag-HTS catalyst under visible light

Table 3 Degradation rate constants (k_app/min^-1) under different initial concentrations of MO

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