The Preparation And Modification Of Nano TiO₂ Photocatalyst

TiO₂ photocatalytic degradation technology can use solar energy to degrade pollutants.It has many advantages,like toxic harmless,mild reaction conditions,etc.,and it's a very promising technology.However,TiO₂ can only absorb ultraviolet,the light energy utilization is not efficient.In this study,sol-gel process is used to synthesize TiO₂ particles.Ti?OBu?4 is used as raw material,and glacial acetic acid/acetyl acetone is used as inhibitor,various reaction conditions are studied and optimized.The results shows that when using glacial acetic acid as inhibitors,30? as hydrolysis temperature,and the molar ratio of glacial acetic acid: butyl titanate: water: ethanol is 0.5: 1: 4: 5,the performance of TiO₂ is best.Secondly,a dipping method is used to modify Ti O₂,and the process conditions were optimized.The results shows that when the concentration of cadmium nitrate/sodium sulfide solution is 1?mol / L,and immersion times is 5,the obtained CdS/ TiO₂ catalyst has best performance.Finally,the CdS/ TiO₂ catalyst obtained was characterized by measuring the load of CdS,and Rhodamine B was used as the target pollutant to investigate the performance of modified CdS/ TiO₂ catalyst& pure TiO₂.The results shows that the absorbing-range of modified TiO₂ is expanded and can absorb visible light.And modified CdS / TiO₂ catalyst also has better catalytic activity.After 110 minutes of lighting,a 98% degradation rate of 5mg/ L Rhodamine B can be reached.