Efficiency And Mechanism On Photocatalytic Activity Of TiO₂ Under Solar Light Irradiation Enhanced By Natural Schorl

In photocatalytic environmental materials, TiO₂ has been studied and applied in wide field, owing to the advantages of high photocatalytic activity, stable chemical property, non-toxicity, non-secondary pollution, low cost and so on. There are many deficiencies, which is narrow range of light response, low quantum efficiency, easy to agglomerate, bad photocatalytic performance under natural light. To enhanced photocatalytic performance of nano TiO₂ by changing the hydrothermal preparation conditions and mineralogical characteristics of special natural tourmaline. By researching thoroughly and systematically. Optimum process conditions for the manufacture were determined, the structure and catalytic performance of the sample were analysised. Based on the first principle, echanism on photocatalytic activity of TiO₂ under solar light irradiation enhanced by natural schorl were revealedNano TiO₂ sample with natural photocatalytic activity has synthesized by improved hydrothermal method at different conditions. The obtained TiO₂ samples derived from different precursors were characterized by X-ray diffraction?XRD?, scanning electron microscopy?SEM? and transmission electron microscopy?TEM?, UV-vis diffusive reflectance spectroscopy?UV-vis DRS? and photoluminescence?PL? spectroscope. The research found that prepared samples for high exposure?103? crystal plane by anatase TiO₂, so responsed of natural light were realised. Under natural light, high photocatalytic degradation of azo dye methyl orange?MO? over TiO₂ sample, the photocatalytic activity of prepared TiO₂ were the best at 150 ?. The optimal conditions for the degradation were 3 of p H value, 10 mg/L of MO concentration and 3 g/L of photocatalyst dosage.Schorl was calcinaed on different temperatures, and TiO₂/schorl samples was synthesized by the same synthesis method at 150 ?. The obtained TiO₂/ schorl samples derived from different precursors were characterized by X-ray diffraction?XRD?, scanning electron microscopy?SEM? and transmission electron microscopy?TEM?, UV-vis diffusive reflectance spectroscopy?UV-vis DRS? and synthesis method by the TiO₂/ schorl samples at 150?. The obtained TiO₂/ schorl samples derived from photoluminescence?PL? spectroscope. The calculation showed that schorl changed the band gap of TiO₂ from3.04 e V to 2.74 e V, responsed in the visible region around 400 nm, reduced the recombination rate of electron and hole, increased the quantum efficiency, difficulted to agglomerate, when TiO₂ uniformly loaded on the surface of the uncalcined schorl. Through systematic analysis of the experiments, the results indicated that TiO₂/schorl with 5 % uncalcined schorl content?B3? had better photocatalytic activity than others. The analysis suggested that the optimal process parameters were 3 of p H value under natural light, 10 mg/L of MB concentration, and 2 g/L of photocatalyst dosage.