Triple Axial Coelectrospun Multifunctional Double-Shell TiO₂@ZnO Carbon Hollow Nanofibrous Mat Transformed to C-Attached TiO₂ Brush-Like Nanotube Arrays: An Mo⁶⁺ Adsorbent Nonwoven Mat

Abstract

A triple axial co-electrospinning procedure followed with a two-step heat treatment was successfully employed to fabricate continuous heterostructured multifunctional double-shell TiO 2 @ZnO graphite carbon non-woven hollow nanofibrous mats. The as-synthesized TiO 2 @ZnO/C hollow heterojunctions were transformed to 3D high surface area rutile TiO 2 brush-like nanotube arrays attached onto carbon tubular mats under the alkaline hydrothermal and ion exchange processes combined with the annealing. The obtained TiO 2 nanotubes have a typical inner diameter of about 3.5 nm, wall thickness of about 4.0 nm, and length up to several hundred nanometers. Mathematical models, as well as the experimental results exhibited a higher self-adsorption capacity of Mo 6+ pollutant over C-attached TiO 2 nanotubes can be attributed to the larger surface area, providing more active sites for a contact with the reactants and pollutants.Furthermore, the kinetic studies suggested that the pseudo-second-order model is suitable to describe the adsorption mechanism of Mo 6+ over the as-synthesized hollow nanostructures.

Durable Light-Driven Three-Dimensional Smart Switchable Superwetting Nanotextile as a Green Scaled-Up Oil–Water Separation Technology

“…Herein, it is believed that such a smart reversible superwetting property can be clearly ascribed to combined characteristics of both TiO 2 welldistributed nanostructures and the as-spun hierarchical nanofibrous substrate; the electrospinning strategy can be preferred to provide a homogeneous distribution of TiO 2 nanoparticles onto the nanoscaled porous PVDF fibers that will effectively provide the characterizations required for achieving the superior superwetting behavior. 8 A simple mechanism is proposed to explain the switching behavior of the as-spun smart PVDF-P25TiO 2 superwetting nanotextile (Scheme 2). 3,26 Herein, the reversibly surface superwetting can be resulted from (a) the unique topography of the as-spun nanofibrous textile that will effectively provide both the surface roughness and 3D multiscale interconnected pores and (b) the unique chemical composition that can be ascribed to highly available oleophobic −CF 2 functional groups of PVDF and well-rough TiO 2 nanostructures.…”

Grown Carbon Nanotubes on Electrospun Carbon Nanofibers as a 3D Carbon Nanomaterial for High Energy Storage Performance

“…Brunauer‐Emmett‐Teller (BET) technique investigates the porosity and surface area of prepared materials. It decided that the N‐adsorption‐desorption isothermal curve in IV type with hysteresis loops of 3D hybrid carbon nanomaterials, which confirm the porous, hollow, and tubular structure according to IUPAC classification . According to Qiu et al., the specific surface area of vertically grown CNTs/CNFs (950 m 2 g −1 ) has increased double in comparison with CNFs (485 m 2 g −1 ) due to the hierarchical structure of CNTs/CNFs.…”

“…FTIR spectroscopy confirms the conversion of PAN into carbon materials and the composite structure of prepared nanomaterials. Shami et al . presented an FTIR pattern of double shell TiO 2 /ZnO/carbon hollow fibers and TiO 2 attached carbon tubes (represented in Figure d).…”

“…Due to their 1D nanostructure, CNTs grown CNFs nanomaterials can offer the prospect of future fundamental scientific and industrial applications . Shami et al . synthesised 3D hierarchical porous continued multifunctional double‐shell TiO 2 /ZnO/ hollow carbon nanofibers; rutile TiO 2 brush‐like nanotubes were stacked in the 3D hollow carbon fibers to improve the surface area.…”

“…synthesised 3D hierarchical porous continued multifunctional double‐shell TiO 2 /ZnO/ hollow carbon nanofibers; rutile TiO 2 brush‐like nanotubes were stacked in the 3D hollow carbon fibers to improve the surface area. The 3D hybrid structure provided more active sites for reacting with pollutants and removing Mo +6 ions from wastewater . CoNC@MoS 2 grown on electrospun CNFs were found to provide favourable flexibility and electrical conductivity after applying them as bifunctional electrocatalysts due to the synergistic effect of CoNC@MoS 2 and the fast mass‐transport of carbon subtraction .…”