Sandwich Structured Ru@TiO2 Composite for Efficient Photocatalytic Tetracycline Degradation

doi:10.15541/jim20230457

Abstract

Abstract:

TiO₂ nanomaterials are widely used photocatalysts due to high photocatalytic activity, good chemical stability, low cost, and nontoxicity. However, its lower photon utilization efficiency is still limited by larger bandgap width and higher recombination rate between photon and hole. In this study, two-dimensional TiO₂ nanosheets were synthesized via microetching, which were then inserted by ruthenium atoms to form an efficient photocatalyst Ru@TiO₂with sandwich structure. The surface morphology, electronic structure, photoelectric properties, and photocatalytic degradation performance of tetracycline hydrochloride of Ru@TiO₂ sandwich structure were investigated using different measurements. Results indicated that the material’s photoresponse range extended from UV to visible- near-infrared regions, improving photon absorption and carrier separation efficiency while enhancing photocatalytic activity. Under simulated sunlight irradiation (AM 1.5 G, 100 mW·cm^-2) for 80 min, sandwich structured Ru@TiO₂ efficient photocatalyst exhibited superior degradation performance on tetracycline hydrochloride with a degradation efficiency up to 91.91%. This work offers an effective way for the construction of efficient TiO₂based photocatalysts.

Key words: layered titanium dioxide, ruthenium intercalation, photocatalysis, tetracycline hydrochloride

CLC Number:

X703

WANG Zhaoyang, QIN Peng, JIANG Yin, FENG Xiaobo, YANG Peizhi, HUANG Fuqiang. Sandwich Structured Ru@TiO₂ Composite for Efficient Photocatalytic Tetracycline Degradation[J]. Journal of Inorganic Materials, 2024, 39(4): 383-389.

Figures/Tables 6

Fig. 1 Schematic diagram of preparation of sandwich structured L-Ru@TiO2

Fig. 2 XRD patterns of precursor K2Ti4O9 prepared under different conditions

Fig. 3 XRD, XPS, EPR, and BET characterizations of L-TiO2 and L-Ru@TiO2 (a) XRD patterns; (b) Ru3d XPS spectrum of L-Ru@TiO2; (c) O1s, and (d) Ti2p XPS spectra; (e) EPR spectra; (f) Nitrogen adsorption and desorption isotherms and corresponding pore size distribution curves. 1 Gs=10-4 T

Fig. 4 Morphology characterization of L-TiO2 and L-Ru@TiO2 (a,b,d,e) TEM images of (a, b) L-TiO2 and (d, e) L-Ru@TiO2; (c, f) HRTEM images of (c) L-TiO2 and (f) L-Ru@TiO2 with insets showing lattice fringes of TiO2 (105); (g, h) HAADF images and (i) element distributions for L-Ru@TiO2

Fig. 5 Photoelectric properties of L-TiO2 and L-Ru@TiO2 (a) UV-Vis absorption spectra; (b) PL spectra; (c) Transient photocurrent responses; (d) Work functions

Fig. 6 Catalytic degradation performance of L-TiO2 and L-Ru@TiO2 (a) TC degradation and (b) TC photodegradation kinetics curves of photocatalytic raw materials TiO2, L-TiO2 and L-Ru@TiO2 under simulated sunlight; (c, d) Photocatalytic degradation efficiencies of TC by L-Ru@TiO2 at different (c) temperatures and (d) wavelengths; (e, f) Photocatalytic degradation efficiencies of TC in active species trapping experiment by L-Ru@TiO2 (Initial conditions: AO 1 mmol/L, LA 0.5 mmol/L)

References 37

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Sandwich Structured Ru@TiO₂ Composite for Efficient Photocatalytic Tetracycline Degradation

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