Preparation and Photocatalytic Performance of B,N-SnO2/TiO2 Photocatalyst

doi:10.6023/A21050242

Abstract

In order to improve the photocatalytic activity of TiO₂ under visible light, B,N-codoped SnO₂/TiO₂ (B,N-SnO₂/TiO₂) powder photocatalysts were prepared by polymer precursor method, and to further improve the practicability of B,N-SnO₂/TiO₂ photocatalyst, alumina fabrics immobilized B,N-SnO₂/TiO₂ catalyst was prepared by precursor impregnation and pyrolysis method. The typical experimental procedure for synthesis of B,N-SnO₂/TiO₂ powder photocatalysts is as follows: First, tetrapropylorthotitanate (TNPT) was mixed with PEG-600 and Sn(OPr)₄ under magnetic stirring and refluxed for 2 h. Then boric acid was added. Acetamide and acetylacetone were added to the system after boric acid was dissolved completely. Finally, a mixture of deionized water and n-propanol were added dropwise. The whole solution were reflux for 1 h and then the B,N-SnO₂/TiO₂ precursor was obtained by rotary evaporation method. The precursor was placed in a quartz tube furnace and calcined at a heating rate of 3 ℃/min to 450 ℃ for 30 min to obtain B,N-SnO₂/TiO₂ powder type photocatalyst. Supported photocatalysts was prepared as follows: The precursor solution of B,N-SnO₂/TiO₂ was diluted with n-propanol and heated at 100 ℃ for 1 h. The alumina fabrics was immersed in the loaded solution and heated at 100 ℃ for 1 h. Then the precursor immersed fabrics was dried by rotary evaporation method. Supported photocatalysts were obtained by calcining the dried fabrics at 450 ℃ for 30 min in air atmosphere. The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), high-resolution transmission electron microscope (HRTEM), X-ray photoelectron spectroscopy (XPS) and UV-Vis diffuse reflectance spectra (UV-DRS). B,N-SnO₂/TiO₂ powder photocatalysts were predominantly homogeneous anatase phase. The introduction of boron inhibited the growth of anatase phase crystal, and the grain size was 15 nm, showing a stacking structure. The results of HRTEM and energy dispersive spectrometer (EDS) showed that SnO₂ and TiO₂ constructed heterostructure, and the doped elements existed and distributed evenly. Boron and nitrogen co-doping and heterojunction structure effectively improved the separation ability of photogenerated carriers. The photocatalytic activities of B,N-SnO₂/TiO₂ powder photocatalysts were investigated using ofloxacin solution as simulated pollutant. The results indicated that the degradation ratio of ofloxacin reached 98.3% in 15 min under visible light. The B,N-SnO₂/TiO₂-loaded Al₂O₃ fabrics also showed excellent photocatalytic performance, with a thickness of about 100 nm powder photocatalysts on the surface of Al₂O₃ fabrics, and the heterostructure still existed. The results showed that the degradation rate of ofloxacin was 68.7% under visible light irradiation for 120 min, and the photocatalytic performance was almost unchanged after repeated use for 21 times.

Key words: TiO₂, SnO₂, ofloxacin, loaded, visible light catalytic degradation

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Zhiye Ma, Li Ye, Yuhuan Wu, Tong Zhao. Preparation and Photocatalytic Performance of B,N-SnO₂/TiO₂ Photocatalyst[J]. Acta Chimica Sinica, 2021, 79(9): 1173-1179.

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Fig. & Tab. 15

Figure 1. XRD patterns of B,N-SnO2/TiO2 and pure TiO2

样品	Titanium	Tin	Nitrogen	Boron
B,N-SnO₂/TiO₂	53.1	2.6	<1	1.0

Table 1. Chemical composition of B,N-SnO2/TiO2 (weight fraction/%)

Figure 2. XPS images of B, N, O, Ti and Sn of B,N-SnO2/TiO2

Figure 3. (A) SEM image; (B, C) TEM images; (D) SAED image of B,N-SnO2/TiO2

Figure 4. EDS images of B,N-SnO2/TiO2

Figure 5. UV-Vis DRS images of B,N-SnO2/TiO2 and pure TiO2

Figure 6. Plots of (αhν)0.5-hν for B,N-SnO2/TiO2 and pure TiO2

Figure 7. PL spectrum for sample B,N-SnO2/TiO2 and pure TiO2

Figure 8. SEM image and EDS mapping images of each element of supported photocatalyst

Figure 9. TEM images of supported photocatalyst

Figure 10. Cycling tests of photodegradation of ofloxain of supported photocatalyst

Figure 11. Mass of supported photocatalyst after each cycle of photodegradation test

Figure 12. SEM images of supported photocatalysts (A) before and (B) after photocatalysis

Figure 13. Photodegradation efficiencies of ofloxacin by B,N-SnO2/ TiO2 with different trapping agents added under visible light

Figure 14. Schematic illustration of photocatalysis process of B,N-SnO2/TiO2

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B,N-SnO₂/TiO₂光催化剂的制备及其光催化性能研究

Preparation and Photocatalytic Performance of B,N-SnO₂/TiO₂ Photocatalyst

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B,N-SnO2/TiO2光催化剂的制备及其光催化性能研究