Abstract
TiO2 nanoribbons (TiO2 NRs) loaded with FeCo-Al2O3 catalyst were synthesized and used as a precursor in the synthesis of TiO2 nanoribbons/carbon nanotubes (TiO2 NRs/CNTs) composite by a chemical vapor deposition (CVD) method. TiO2 NRs and TiO2 NRs/CNTs composite were characterized by XRD, FT-IR, TEM, SEM, EDX and UV-Vis spectrophotometer. The results revealed the formation of TiO2-B and hydrogen titanate nanoribbon like structures by the hydrothermal treatment. After loading TiO2 NRs by FeCo-Al2O3 catalyst and the CVD growth of carbon nanotubes, the synthetic TiO2 nanoribbons converted entirely to TiO2-B nanoribbons with nanopits structure. The composite composed of tube-like nanostructures forming an interlocked network from CNTs and TiO2-B NRs. The composite shows a relatively red-shifted band gap (3.09 eV), broader and stronger UV absorption band relative to TiO2 NRs. The photocatalytic properties of TiO2 NRs and TiO2 NRs/CNTs composite were studied under sunlight irradiation. The photocatalytic degradation of methylene blue (MB) dye was investigated as a function of contact time, dye concentration, and catalyst dose. The kinetics and mechanisms of degradation were discussed. TiO2 NRs/CNTs composite showed higher stability after six runs and 50% shorter irradiation time than TiO2 NRs photocatalyst.
Highlights
Several techniques have been investigated to remove dyes from water and industrial wastewater including chemical precipitation, conventional coagulation, reverses osmosis, ion exchange, electrodialysis, electrolysis, adsorption, and photocatalytic degradation[7]
In this work, we investigate the synthesis of TiO2 nanoribbons (NRs)/Carbon nanotubes (CNTs) nanocomposite through a novel method by loading of FeCo-Al2O3 carbon nanotubes (CNTs) growth catalyst on TiO2 NRs followed by chemical vapor deposition of CNTs
TiO2 NRs/CNTs nanocomposite was successfully synthesized by a chemical vapor deposition of CNTs using hydrothermally synthetic TiO2 NRs supported by the FeCo-Al2O3 catalyst
Summary
Several techniques have been investigated to remove dyes from water and industrial wastewater including chemical precipitation, conventional coagulation, reverses osmosis, ion exchange, electrodialysis, electrolysis, adsorption, and photocatalytic degradation[7]. Several inorganic materials of suitable band gap energy have been studied for photocatalytic degradation of dyes including several semiconductor metal oxides[10]. Among Such metal oxides, TiO2 materials of different forms (powder, Nanotubes, Nanorods, and Nanoribbons) exhibit high efficiency in photocatalytic degradation of dyes[11]. Modification of TiO2 was performed through different methods including doping of TiO2 by metals, non-metals, semiconductors nanoparticle, graphene, and carbon nanotubes (CNTs)[11,14]. In this work, we investigate the synthesis of TiO2 nanoribbons (NRs)/Carbon nanotubes (CNTs) nanocomposite through a novel method by loading of FeCo-Al2O3 CNTs growth catalyst on TiO2 NRs followed by chemical vapor deposition of CNTs. The structures, morphologies, and optical properties of the fabricated nanostructures were investigated. Sunlight as a natural source of light was selected in this study for two reasons; the first is related to the economic value of using natural sunlight instead of artificial sources and the second reason is related to testing the applicability of the product to be used in natural surface water bodies without any special stations
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