The intentional design and construction of photocatalysts containing heterojunctions with readily accessible active sites will improve their ability to degrade pollutants. Herein, hierarchically porous WO3/CdWO4 fiber-in-tube nanostructures with three accessible surfaces (surface of core fiber and inner and outer surfaces of the porous tube shell) were fabricated by an electrospinning method. This WO3/CdWO4 heterostructure, assembled by interconnected nanoparticles, displays good photocatalytic degradation of ciprofloxacin (CIP, 93.4%) and tetracycline (TC, 81.6%) after 90 min of simulated sunlight irradiation, much higher than the pristine WO3 (<75.3% for CIP and <53.6% for TC) or CdWO4 materials (<58.9% for CIP and <39.5% for TC). The WO3/CdWO4 fiber-in-tube promotes the separation of photoinduced electrons and holes and also provides readily accessible reaction sites for photocatalytic degradation. The dominant active species determined by trapping active species and electron paramagnetic resonance were hydroxyl radicals followed by photogenerated holes and superoxide anions. The WO3/CdWO4 materials formed a Z-scheme heterojunction that generated superoxide anion and hydroxyl radicals, leading to degradation of antibiotics (CIP and TC) via photocatalysis in aqueous solution.

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Bi2WO6 nanofibrous mat has been successfully synthesized by a simple electrospinning process. TG-DTA, FT-IR, XRD, SEM, and UV–visible diffuse reflectance spectra were used to characterize the mat. The results indicated that the mat was composed of one-dimensional nanofibers, whose diameter was about 300 nm. The one-dimensional nanofibers consisted of Bi2WO6 nanoparticles with diameter 112 nm. Also, the Bi2WO6 nanofibrous mat exhibited excellent visible photocatalytic property in the photodegradation of methylene blue. Meanwhile, the photocatalyst synthesized by electrospinning is helpful for separation and recycling. What’s more, the preparation method is suitable for large-scale commercial production. So, the work has great application value in the future.

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Bismuth phosphate (BiPO 4 ) nanofibers were prepared through a simple electrospinning method and followed by calcination treatment. The prepared samples were characterized with thermogravimeter and differential scanning calorimeter (TG-DSC), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N 2 adsorption−desorption measurements, UV−vis absorbance spectroscopy, electrochemical impedance spectra (EIS), and the photoluminescence spectra. The diameter of the as-prepared fibers is about 200 nm. The nanofibers are mesoporous and composed of the linked nanoparticles with sizes of about 15 nm. The rate constant of degradation of APMP pulping effluent for mesoporous nanofibers is 1.55 times of that of the powders prepared by sol-gel method and 3.72 times of that of P25.

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