Preparation And Properties Of The Hierarchical Structure Te@C-TiO₂ Composites

Hierarchical structure materials are a very important branch in the field of materials science.Hierarchical structure materials usually exhibit more excellent physical and chemical properties than ordinary micro and nanomaterials.They not only show the characteristics of nanostructure units,but also show more superior synergistic effects of the whole structure.Hierarchical structure of the materials also have a wealth of structural design and structural adjustment of the complex overall structure for different applications provides a variety of structural options.In this work,we prepared the hierarchical structure Te@C-TiO₂ composites by hydrothermal method and studied the photocatalytic properties.Meanwhile,inspired by the bionics micro-nano structure,the Hierarchical structure Te@C-TiO₂ composites were studied for its superhydrophobicity and its application after simple low surface energy material treatment.The main contents are as follows:In this work,using Te nanowires as templates material,glucose as carbon source and titanium oxysulfate as Ti precursor,carbon nanofiber loaded TiO₂ nanocomposites?CNFs-TiO₂?were prepared via hydrothermal synthesis and then followed calcination process under the inert atmosphere.The obtained nanocomposites were characterized by SEM,TEM,EDS,XRD and TG,respectively.A series of CNFs-TiO₂ nanocomposites with different loading amount of TiO₂ nanoparticles were prepared,which were applied to photo-degradation of Methyl orange solution.The photocatalytic experiment results indicated the CNFs-TiO₂ sample with loading amount of TiO₂ of 57.63%exhibited the best photocatalytic performance among all of the samples.Moreover,the photocatalytic activity of the carbon nanofiber loaded TiO₂ prepared by hydrothermal method is higher than that of the P25 nanoparticles.Based on the above research,Te@C nanowires of different diameters were prepared by adjusting the hydrothermal reaction time and the amount of Te nanowires by the above method;and then TiO₂ nanoparticles were grown on the surface of Te@C by hydrothermal method;Finally,Te@C-TiO₂ composites with different hierarchical structures were obtained.Inspired by the bionic structure,this hierarchical structure can be used as a superhydrophobic surface modification with low surface energy materials.The results shows that the hierarchical structure Te@C-TiO₂ composites show good superhydrophobicity.The results showed that the diameter of the Te@C nanowires has a significant effect on the superhydrophobicity of the Te@C-TiO₂ coating surface.Among them,the surface of the hierarchical structure Te@C-TiO₂ composite prepared by 200 nm Te@C nanowires has the best superhydrophobicity.Furthermore,due to their free-standing performance,the hierarchical structure Te@C-TiO₂ composite were easily loaded onto a polyester fabric to generate a robust superhydrophobic fabric.This fabric shows excellent mechanical durability and strong resistance to knife scratching,sandpaper abrasion,washing,as well as exposure to acid and alkali solutions.Moreover,the robust fabric is able to separate oil/water mixtures with high separation efficiency.