| The current research situation and recent development on one-dimensional vanadate nanoscale materials, electrochemical determination of biological molecules and the application of vanadate nanoscale materials in photocatalytic field have been demonstrated. Copper vanadate nanobelts, zinc vanadate nanorods and manganese vanadate nanobelts have been synthesized by hydrothermal method. The structure, morphology, size and optical property were analyzed by X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), high-resolution TEM(HRTEM) solid UV-vis diffuse reflectance spectrum. The role of the growth conditions on the formation of the copper vanadate nanobelts, zinc vanadate nanorods, manganese vanadate nanobelts and growth mechanism have been researched. The electrochemical determination of ascorbic acid using copper vanadate nanobelts modified glassy carbon electrode, the photocatalytic properties for the degradation of methylene blue(MB) using zinc vanadate nanorods and manganese vanadate nanobelts have been investigated. It is great significance for the controlled synthesis, formation mechanism and application of the transition metal vanadate one-dimensional nanoscale materials.Copper vanadate nanobelts have been synthesized by the hydrothermal process using sodium vanadate and copper acetate as the raw materials, polymer polyvinyl pyrrolidone(PVP) as the surfactant by adjusting pH value. XRD and HRTEM show that the copper vanadate nanobelts are composed of single crystalline monoclinic Cu2.33V4O11 phase. SEM observation shows that the copper vanadate nanobelts have the thickness, width and length of about 50 nm, 300 nm-1 μm and several tens of micrometers, respectively. The growth process of the copper vanadate nanobelts has been proposed as the nucleation and PVP adsorption growth mechanism under acidic and alkaline conditions. The copper vanadate nanobelts have been used as glassy carbon electrode(GCE) modified materials for the determination of ascorbic acid. The roles of the ascorbic acid concentration, species of electrolytes and scan rate on the electrochemical cyclic voltammograms(CVs) have been analyzed. The linear range is 0.001-2 mM and detection limit is 0.14 μM and 0.38 μM for cvp1 and cvp2, respectively. The copper vanadate nanobelts modified GCE exhibits good stability and reproducibility.Zinc vanadate nanorods have been synthesized by the hydrothermal process using zinc acetate and sodium vanadate as the raw materials. XRD pattern and HRTEM image show that the zinc vanadate nanorods are composed of single crystalline monoclinic Zn2V2O7 phase. SEM and TEM observations show that the diameter and length of the zinc vanadate nanorods are 50-100 nm and about 5 μm, respectively. Sodium dodecyl sulfonate(SDS) has an essential role in the formation of zinc vanadate nanorods. The SDS-assisted nucleation and growth process have been proposed to explain the formation and growth of the zinc vanadate nanorods. Solid UV-vis diffuse reflectance spectrum shows that the zinc vanadate nanorods have a band gap of 2.76 eV. The photocatalytic activities of the zinc vanadate nanorods have been evaluated by the photocatalytic degradation of MB under solar light irradiation. The MB with the concentration of 10 mgL-1 can be degraded totally under the solar light irradiation for 4 h. It is suggested that the zinc vanadate nanorods exhibit promising application potential for the degradation of organic pollutants under solar light irradiation.Manganese vanadate nanobelts have been synthesized by the hydrothermal process using ammonium metavanadate and manganese acetate as the raw materials, PVP as the surfactant by adjusting the pH value. The manganese vanadate nanobelts are composed of single crystalline monoclinic Mn2V2O7 phase. The thickness, width and length of the manganese vanadate nanobelts are 20 nm, 350 nm-1 μm and several dozens to several hundreds of micrometers, respectively. Under acidic or alkaline hydrothermal conditions, the morphology of the products is transformed from nanosheets to nanobelts with the length of several dozens of micrometers, the structure of the products is transformed from amorphous state to monoclinic Mn2V2O7 phase with increasing the PVP concentration, hydrothermal temperature and duration time. Solid UV-vis diffuse reflectance spectrum shows that the band gap of the manganese vanadate nanobelts is 2.79 eV. After 4 h of the irradiation by the solar light using manganese vanadate nanobelts as the photocatalytic materials, MB with the concentration of 10 mg·m L-1 can be totally degraded. The organic pollutants can be efficiently degraded using manganese vanadate nanobelts under solar light irradiation. |
