Preparation And Application Properties Of Blue TiO 2 (B) Nanorods

Semiconductor photocatalysts are widely used in pollutant degradation,hydrogen production and Lithium-ion batteries.Especially,titanium dioxide(TiO2)nanomaterials are widely researched because of chemical stability,low toxicity,and excellent photocatalytic activity.However,there are several defects in TiO2,the band gap is 3.2 eV,which is too wide to absorb visible light,the fast recombination of photogenerated carriers influence the photocatalytic performance.Recently,the prepared Ti3+self-doped of black titania is becoming a research hotspots,which can improve visible and infrared light absorption.Because the amount of reagents used is different,the color depth of the catalyst is also different,in a broad sense called black.So a simple sol-gel method combined with hydrothermal approach and subsequent in-situ solid-state chemical reduction technique is adopted,then followed by calcination at 350 ? in nitrogen to prepare blue TiO2(B)single-crystalline nanorods(b-TR).The photocatalytic mechanism of blue TiO2(B)nanorods,the degradation of RhB,photocurrent density,and hydrogen production are also studied.The scanning electron microscopy,transmission electron microscopy(SEM),X-ray diffraction(XRD),Raman,X-ray photoelectron spectroscopy(XPS)and UV-vis diffuse reflectance spectroscopy(UV-Vis)show that the bandgap of TiO2(B)nanorod is narrowed,which is special single-crystalline TiO2(B)phase,Ti3+ self-doping and One-dimensional rod-like nanostructure.The results of experiment show that the bandgap of the as-prepared catalyst is reduced to 2.61 eV,which can rapidly improve visible light adsorption.The degradation rate of RhB reaches 97.01%,photocurrent density is up to 56 ?A cm-2,and hydrogen production is achieved 149.2 ?mol h-·g-1.The enhanced photocatalytic performance are attibuted to the synergetic effect of the special TiO2(B)phase,Ti3+ self-doping,and the One-dimensional rod-shaped nanostructure,absorbing the visible light,facilitating the transfer and separate of photogenerated e~--h~+.