Abstract
In this work, CdS/ZnO composite nanofibers (NFs) were prepared by the electrospinning of a sol–gel comprised of poly(caprolactone), zinc acetate dihydrate, cadmium acetate dihydrate, and ammonium sulfide. The electrospun NF mats were calcined under vacuum in an argon (Ar) atmosphere at 200 °C for 1 h. Standard physiochemical analysis techniques demonstrated the formation of the crystalline hexagonal phase of CdS and ZnO. Composite NFs showed good photocatalytic degradation of methylene blue (MB) dye under visible light irradiation compared to their counterparts. CdS nanoparticles, ZnO nanofibers, and composite NFs photodegraded 35.5%, 47.3%, and 90% of the MB dye, respectively, within 100 min. The reaction kinetics of MB photodegradation using the composite NFs followed the pseudo-first-order relation. Owing to their facile preparation and good photodegradation ability, the proposed method can be used to prepare various photocatalysts for wastewater treatment.
Highlights
Environmental pollution is currently considered to be one of the four major global issues [1,2].This problem is exacerbated by increasing industrial development and its use of organic pollutants, which produce high amounts of organic contaminants [1,2,3]
Composite NFs are still smooth, but pearls appear in the fibers (Figure 1b)
The obtained values are close to the theoretical feed ratio, which confirm that the preparation of the composite NFs was successful
Summary
Environmental pollution is currently considered to be one of the four major global issues [1,2]. Guorui et al [6] prepared ID CdS/ZnO core/shell NFs using an ES technique for the production of hydrogen from water splitting They calcinated electrospun NF mats in an oxygen atmosphere at high temperature to remove the poly(vinylpyrrolidone) (PVP) polymer substrate and form crystalline CdS/ZnO. Their results indicated the formation of cadmium sulfate rather than cadmium sulfide, which could have been due to the high calcination temperature in the oxygen atmosphere. The electrospun NF mats were calcined under vacuum at 200 ◦ C for 1 h This low temperature was sufficient for removal of poly(caprolactone) and the formation of crystalline NFs. To our knowledge, no study on the use of this procedure to prepare composite NFs has been published. NFs exhibited good photocatalytic action in the degradation of MB dye in visible light
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