Abstract:

By using Bi（NO₃）₃·5H₂O as the bismuth source and Na₂WO₄·2H₂O as the tungsten source，porous Bi₂WO₆ was prepared by hydrothermal method，and g-C₃N₄/Bi/Bi₂WO₂₆（CN/B/BWO） composite photocatalyst with Z-type heterostructure was prepared by solvothermal method with g-C₃N₄ with ellipsoidal structure formed by stacking nano strips as substrate and in situ reduction of metal Bi.The prepared samples were characterized by X-ray diffraction（XRD），scanning electron microscopy（SEM），transmission electron microscopy（TEM），nitrogen adsorption desorption isotherm（BET），ultraviolet visible absorption spectrum（UV-vis） and photoluminescence spectrum（PL）.The results showed that the metal Bi could be used as the charge transfer medium between g-C₃N₄ and Bi₂WO₆.The surface plasmon resonance（SPR） effect generated by metal Bi could synergistically enhance the separation efficiency of photogenerated electron-hole pairs and the mobility of carriers，thereby improving the photocatalytic activity of the samples.Under the irradiation of 350 W xenon lamp for 30 min，the degradation rate of tetracycline hydrochloride（TC-H） by sample CN/B/BWO-0.7 was 99.94%，and the degradation mechanism was discussed.

Key words: Bi₂WO₆, heterostructure, photocatalysis, tetracycline hydrochloride