BiOI/g-C_(3)N_(4)光催化剂的合成及降解环丙沙星研究

Synthesis of BiOI/g-C_(3)N_(4) Photocatalysts and Their Application in Degradation of Ciprofloxacin

使用煅烧与原位沉积联合法合成了碘氧化铋类石墨相碳化氮(BiOI/g-C_(3)N_(4))光催化剂,并应用于降解环丙沙星抗生素。通过SEM,FT-IR,XRD表征手段对所制备的BiOI/g-C_(3)N_(4)催化剂进行表征,并考察了g-C_(3)N_(4)与BiOI物质的量比、催化剂用量及pH值对降解环丙沙星催化活性的影响,确定最佳的催化条件。实验结果表明,当催化剂投入量为1.25g,g-C_(3)N_(4)与BiOI物质的量比为0.5,pH值为7时,环丙沙星的降解率可达57.86%。此外,将催化剂用于光催化降解环丙沙星的循环实验中,发现催化剂重复使用4次后,仍具有极佳的催化活性,说明该催化剂具有较高的催化稳定性。

The BiOI/g-C_(3)N_(4) photocatalysts are prepared by the combination of calcination and in-situ deposition methods and applied in the degradation of ciprofloxacin.The BiOI/g-C_(3)N_(4) photocatalysts are characterized with SEM,FT-IR and XRD.The effects of catalyst dose,molar ratio of g-C_(3)N_(4) to BiOI and pH on the catalytic activities in the degradation of ciprofloxacin are also investigated to determine the optimum catalytic conditions.The experiment results show that the degradation efficiency can achieve 57.86%when the amount of catalyst is 1.25g,the molar ratio of g-C_(3)N_(4) to BiOI is 0.5 and the pH is 7.In addition,in the cyclic experiments of photocatalytic degradation of ciprofloxacin,it is found that the catalyst still possess an excellent catalytic activity after repeated use for 4 times,which indicates that the catalyst has a good catalytic stability.