A novel strategy for the preparation of heterojunction derivants by regulating the loading of precursors was proposed and applied for the first time to effectively remove dyes and antibiotics. Zeolite imidazole framework-8 (ZIF-8)-derived ZnO/TiO 2 nano-burst-tube (NBT) was prepared by calcination of ZIF-8 as precursor grown in a solvothermal system adjusted by NH 4 OH or NaOH , TiO 2 NBT as solvothermal substrate. Through a reasonable selection of solvothermal system, ZIF-8-derived ZnO/TiO 2 NBT not only provides enhanced specific surface area (1012.3 m 2 /g), but also enhances the visible light response and charge separation of TiO 2 NBT, whose instantaneous photocurrent density is up to 53 mA cm −2 , which is three times that of TiO 2 NBT. Under visible light irradiation, ZnO/TiO 2 NBT achieved rapid degradation of Rhodamine B(RhB), tetracycline hydrochloride (TCH) and chlortetracycline hydrochloride (CTC) with complete removal within 20 min, outperforming ZnO, ZIF-8, TiO 2 NBT and ZIF-8/TiO 2 NBT, with excellent cyclic photocatalytic performance. The results show that the degradation pathways of RhB, TCH and CTC are different. The work provides a promising strategy for multifunctional derivative photocatalytic materials preparation.
The pod-shaped TiO2 nano burst tubes (TiO2 NBTs) were prepared by the combination of electrospinning and impregnation calcination with oxalic acid (H2C2O4), polystyrene (PS) and tetrabutyl titanate. The silver nanoparticles (AgNPs) were loaded onto the surface of TiO2 NBTs by ultraviolet light reduction method to prepare pod-shaped Ag@TiO2 NBTs. In this work, we analysed the effect of the amount of oxalic acid on the cracking degree of TiO2 NBTs; the effect of the concentration of AgNO3 solution on the particle size and loading of AgNPs on the surface of TiO2 NBTs. Scanning electron microscopy and transmission electron microscopy investigated the surface morphology of samples. X-ray diffraction and X-ray photoelectron spectroscopy characterized the structure and composition of samples. Rhodamine B (RhB) solution was used to evaluate the photocatalytic activity of pod-shaped TiO2 NBTs and Ag@TiO2 NBTs. The results showed that TiO2 NBTs degraded 91.0% of RhB under ultraviolet light, Ag@TiO2 NBTs degraded 95.5% under visible light for 75 and 60 min, respectively. The degradation process of both samples was consistent with the Langmuir–Hinshelwood first-order kinetic equation. Therefore, the catalytic performance of the sample is: Ag@TiO2 NBTs > TiO2 NBTs > TiO2 nanotubes.
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