Facile Fabrication of Porous ZnS and ZnO Films by Coaxial Electrospinning for Highly Efficient Photodegradation of Organic Dyes

Abstract

Porous ZnS and ZnO nano-crystal films were fabricated via a three-step procedure. First, Zn(CH 3 COO) 2 /Silk Fibroin nanofiber mats were prepared by coaxial electrospinning. Second, Zn(CH 3 COO) 2 /Silk Fibroin mats were immersed in NaS solution to react with S 2À to obtain ZnS/Silk Fibroin nanofiber mats. Finally, ZnO porous films were prepared by calcination of ZnS/Silk Fibroin composite mat at 600°C in air atmosphere. When ZnS/Silk Fibroin mats were calcinated in nitrogen, ZnS/Carbon composite mats were obtained accordingly. The resulting porous films were fully characterized. The ZnO porous films were the aggregation of ZnO nano-crystal with hexagonal wurtzite structure. The seize of ZnO was estimated in the range of 10-20 nm. Both of the ZnS and ZnO nano-crystal films exhibited high photocatalytic activities for the photodegradation of Methylene blue and Rhodamine B. It was also found that ZnO porous films are better than ZnS/Carbon nanofiber mats. In addition, photocatalysis of a real wastewater sample from a printing and dyeing company was conducted. The ZnO porous films exhibited excellent performance to treat the real samples. Moreover, the porous ZnO nano-crystal photocatalyst could easily be recycled without notable loss of catalysis ability.

Multi-shelled ZnO decorated with nitrogen and phosphorus co-doped carbon quantum dots: synthesis and enhanced photodegradation activity of methylene blue in aqueous solutions

“…[18][19][20][21][22][23] Under the excitation of UV-Vis light, nano-ZnO can degrade toxic pollutants and transform them into small inorganic molecules. A number of toxic organic pollutants, such as 2,4,6-trichlorophenol, 24 phenol, 25 and methyl parathion, 26 and inorganic pollutants 27 can be effectively removed a Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan, 430205, PR China. E-mail: lfzhang@wit.edu.cn by this method.…”

In situ sulfuration synthesis of flexible PAN-CuS “flowering branch” heterostructures as recyclable catalysts for dye degradation

“…It is known that electrospinning is a powerful method to fabricate one-dimensional functional materials with large specic surface-areas, high porosity, good exibility and high stability. [41][42][43] Herein, we elaborately developed stringed "owering branch" PAN-CuS with hierarchical architecture combining brous PAN skeleton and active CuS material. First, we obtained PAN-Cu 2+ composite nanobers from a simple electrospinning method.…”

A Sharp Jump in Photocatalytic Activity of Elemental Sulfur for Dye Degradation in Alkaline Solution

“…Thus, these pollutants must be removed from the water (1). Several methods have been reported for the removal of dyes from wastewater such as adsorption (2)(3)(4)(5)(6)(7)(8)(9)(10)(11), membrane filtration (12,13), oxidation (14), coagulation-flocculation (15), and photocatalytic process (16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28). Each of these methods has their advantages and disadvantages.…”