Abstract
Novel flexible and recyclable core-shell heterostructured fibers based on cauliflower-like MoS2 and TiO2/PVDF fibers have been designed through one-step hydrothermal treatment based on electrospun tetrabutyl orthotitanate (TBOT)/PVDF fibers. The low hydrothermal temperature avoids the high temperature process and keeps the flexibility of the as-synthesized materials. The formation mechanism of the resultant product is discussed in detail. The composite of MoS2 not only expands the light harvesting window to include visible light, but also increases the separation efficiency of photo-generated electrons and holes. The as-prepared product has proven to possess excellent and stable photocatalytic activity in the degradation of Rhodamine B and levofloxacin hydrochloride under visible light irradiation. In addition, the TiO2/PVDF@MoS2 core-shell heterostructured fibers exhibit self-cleaning property to dye droplets under visible light irradiation. Meanwhile, due to its hydrophobicity, the resultant product can automatically remove dust on its surface under the rolling condition of droplets. Hence, the as-prepared product cannot only degrade the contaminated compounds on the surface of the material, but also reduce the maintenance cost of the material due to its self-cleaning performance. Therefore, the as-prepared product possesses potential applications in degradation of organic pollutants and water treatment, which makes it a prospective material in the field of environmental treatment.
Highlights
As a highly efficient, economical and environmentally friendly “green” technology, photocatalysis offers tremendous potential for environmental protection and energy conversion
Novel flexible, recyclable, and reusable TiO2/Polyvinylidene difluoride (PVDF)@MoS2 core-shell heterostructured fibers were synthesized by one-step hydrothermal treatment at low temperature based on electrospun tetrabutyl orthotitanate (TBOT)/PVDF fibers
The photocatalytic performances of the as-synthesized samples were evaluated by decomposing the model pollutants rhodamineB (RhB, 15 mg·L−1) and levofloxacin hydrochloride (LVFX, 5 mg·L−1) under visible-light irradiation at room temperature
Summary
Economical and environmentally friendly “green” technology, photocatalysis offers tremendous potential for environmental protection and energy conversion. The key for preparation of a highly active and recyclable TiO2-based photocatalyst is to find a strategy for inhibiting photo-generated electron-hole recombination, narrowing the band gap and easy recovery and recycle. To this end, many strategies have been developed, one of which is the composition of narrow band gap semiconductors to TiO2 to form a heterogeneous structure [4,5,6]. Novel flexible, recyclable, and reusable TiO2/PVDF@MoS2 core-shell heterostructured fibers were synthesized by one-step hydrothermal treatment at low temperature based on electrospun tetrabutyl orthotitanate (TBOT)/PVDF fibers. The mechanism that the flexible TiO2/PVDF@MoS2 core-shell heterostructured fibers have excellent photocatalytic activity on organic pollutants under visible light was discussed. The application of flexible TiO2/PVDF@MoS2 core-shell heterostructured fibers to the decomposition of toxic and harmful organic pollutants is of great significance for environmental protection
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