Preparation of SiO2@Ag@SiO2@TiO2 Core-shell Structure and Its Photocatalytic Degradation Property

doi:10.15541/jim20210685

Abstract

Abstract:

Photocatalytic degradation is an eco-friendly and high-efficiency way to degrade dye pollutants which has broad application prospects in water pollution control. In this study, the multi-layer core-shell structure of SiO₂@Ag@SiO₂@TiO₂ was synthesized by different methods as a photocatalyst for pollutant degradation, with oxidation-reduction method, modified Stöber method and hydrothermal method in turn. Effect of silver nitrate (AgNO₃), tetraethyl orthosilicate (TEOS) and tetrabutyl titanate (TBOT) on the coating effect were discussed. Microstructure, phase structure, pore structure parameters and photoelectrical properties of SiO₂-based multi-layer core-shell structure were systematically analyzed by various characterization methods while its degradation performance of methylene blue (MB) was also studied and discussed. The results show that when the mass ratio of AgNO₃, TEOS and TBOT to SiO₂ is 5 : 2.4 : 6 : 1, each layer of the multi-layer cored shell structure achieves the optimal coating effect. Compared with SiO₂@TiO₂ and SiO₂@Ag@TiO₂, the core-shell structure of SiO₂@Ag@SiO₂@TiO₂ photocatalyst has the best photocatalytic activity. Its photocatalytic degradation efficiency is close to 93% after simulated visible light irradiation for 45 min, and degradation efficiency keeps at 90% after 4 cycles of recycling tests.

Key words: core-shell structure, photocatalysis, titanium dioxide, methylene blue

CLC Number:

TB333

CHI Congcong, QU Panpan, REN Chaonan, XU Xin, BAI Feifei, ZHANG Danjie. Preparation of SiO₂@Ag@SiO₂@TiO₂ Core-shell Structure and Its Photocatalytic Degradation Property[J]. Journal of Inorganic Materials, 2022, 37(7): 750-756.

Figures/Tables 12

Fig.1 Schematic diagram for synthesizing SiO2@Ag@SiO2@TiO2 microspheres

Fig. 2 SEM images of SiO2@Ag microspheres prepared with different AgNO3/SiO2 mass ratios (a) 2 : 1; (b) 3 : 1; (c) 4 : 1; (d) 5 : 1

Fig. 3 STEM image (a), EDS pattern of selected region (b), TEM image (c), and HRTEM image (d) of SiO2@Ag microspheres

Fig. 4 SEM images of SiO2@Ag microspheres before (a) and after (b) thermal-treated at 500 ℃

Fig. 5 SEM images of SiO2@Ag@SiO2 microspheres prepared with different TEOS/SiO2 mass ratios (a) 0.9 : 1; (b) 1.4 : 1; (c) 1.9 : 1; (d) 2.4 : 1

Fig. 6 SEM images of SiO2@Ag@TiO2 microspheres with different TBOT/SiO2 mass ratios (a) 3 : 1; (b) 4 : 1; (c) 5 : 1; (d) 6 : 1; (e) 7 : 1; (f) 8 : 1

Fig. 7 (a) TEM image, (b) EDS pattern, (c) HRTEM image and corresponding elemental mapping of O, Si, Ag and Ti of SiO2@Ag@SiO2@TiO2 microspheres

Fig. 8 XRD patterns of different SiO2-based microspheres

Table 1 Pore structure parameters of different microspheres

Sample	S_BET/ (m²·g^-1)	Pore volume/ (cm³·g^-1)	Average pore size/nm
SiO₂	18.95	0.23	56.20
SiO₂@Ag	23.87	0.38	62.78
SiO₂@Ag@TiO₂	48.36	0.23	15.85
SiO₂@Ag@SiO₂@TiO₂	81.36	0.25	10.37

Fig. 9 Nitrogen adsorption-desorption isotherms of different SiO2-based microspheres

Fig. 10 ln(At/A0)-t curves of different samples and cyclic tests of MB degradation by SiO2@Ag@SiO2@TiO2 (insert)

Fig. 11 Transient photocurrent responses (a) and electrochemical impedance spectra (b) of different samples

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Preparation of SiO₂@Ag@SiO₂@TiO₂ Core-shell Structure and Its Photocatalytic Degradation Property

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