g-C_(3)N_(4)/TiO_(2)复合材料的制备及降解四环素的研究

Preparation of g-C_(3)N_(4)/TiO_(2) Composite Materials and Degradation of Tetracycline

文章以三聚氰胺和尿素为原材料,采用缩聚热解法以550℃高温煅烧4 h合成g-C_(3)N_(4),将其与TiO_(2)前驱体通过水热法结合煅烧工艺制备g-C_(3)N_(4)/TiO_(2)复合材料。目标降解物选用四环素,以成分配比、p H等作为自变量,探讨对四环素降解率的影响,并采用XRD、SEM、BET测试手段对材料性能进行表征。在实验中,投加70 mg经过120℃水热4 h和500℃煅烧2 h的g-C_(3)N_(4)/TiO_(2)粉末用于降解70 m L浓度为10 mg/L的四环素溶液。结果显示,在氙灯光照下,在90 min内g-C_(3)N_(4)与TiO_(2)质量比为12∶100的g-C_(3)N_(4)/TiO_(2)对四环素的降解率达88.43%,TiO_(2)对四环素的降解率为64.73%,降解率提升了40%。

Using melamine and urea as raw materials,g-C_(3)N_(4)was synthesized by calcining at 550℃for 4 h via polycondensation pyrolysis method.g-C_(3)N_(4)/TiO_(2)composite was prepared by hydrothermal combined calcination process with TiO_(2)precursor.Tetracycline was selected as the target degradation material.The effects on the degradation rate of tetracycline were investigated with the composition ratio and p H as independent variables.The properties of the material were characterized by XRD,SEM and BET.In the experiment,70 mg g-C_(3)N_(4)/TiO_(2)powder was added to degrade 70 m L tetracycline solution with a concentration of 10 mg/L.The catalytic material was heated at 120℃for 4 h and calcined at 500℃for 2 h.The results showed that the degradation rate of tetracycline by g-C_(3)N_(4)/TiO_(2),which the mass ratio of g-C_(3)N_(4)to TiO_(2)was 12∶100,reached 88.43%within 90 min under xenon lamp irradiation.The degradation rate of TiO_(2)was 64.73%,and the degradation rate was increased.