Research About The Properties Of Modified TiO₂@C Nanocomposites In The Fields Of Visible Light Photocatalysis And Lithium Ion Battery

As the industrialization is speeding up,more and more organic pollutants in the industrial wastewater makes the study of visible light photocatalysis increasingly important.Researchers have found that TiO₂@C composites possess good visible light absorption and high separation rate of charge carriers,which is good to photocatalysis.However,the photocatalytic activity of TiO₂@C composites has yet to be improved.Therefore,in the thesis,TiO₂@C nanocomposties were synthesized.In addition,the impact of HF on the visible light photocatalytic performance of TiO₂@C was also studied.At the same time,the lithium electricity performances of TiO₂@C nanocomposites were tested.The detailed work contents are as the following:（1）TiO₂@C nanocomposites were prepared by using TiCl₄ as the titanium source and glucose as the carbon source via hydrothermal-annealing method.By adjusting the molar concentration of glucose and the annealing temperature,the optimum experimental parameters were determined.Next,by degrading rhodamine b so lution,the performance of the TiO₂@C nanocomposites was significantly improved after annealing.And the enhanced photocatalytic performance was attributed to the graphite-like carbon,the chemical binding at the interface between TiO₂ nanocrystals and carbon layer as well as the oxygen vacanc ies in TiO₂.Compared to other similar literatures by evaluating the degradation rate of unit mass of the catalyst,the as-prepared TiO₂@C nanocomposites showed excellent pbotocatalytic activity.（2）TiO₂@C nanocomposites were prepared with fluorination via hydrothermal-annealing method.By literature search and experiments,the optimum experimental parameters were determined.The photocatalytic activity of TiO₂@C nanocomposites with fluorination was evaluated by degrading RhB.And the results showed better photocatalytic performance than the similar annealed sample without HF.（3）The annealed and unannealed TiO₂@C nanocomposites were made for anode electrodes and their cycle performance and rate properties were tested.And the results showed that although both of the two samples had the similar structure,special surface area,pore size and pore volume,the annealed sample exhibited better performances,implying that annealing also had a positive effect on lithium performance.