Fe掺杂g-C_(3)N_(4)光催化活化过硫酸钠降解偶氮染料

Fe‐Doped g‐C_(3)N_(4)Photocatalytic Activation of Persulfate for Degradation of Azo Dyes

以硝酸铁为铁源,通过浸渍法制备Fe-C_(3)N_(4)复合材料。采用FT-IR对Fe-C_(3)N_(4)材料进行了表征分析。结果表明,Fe掺杂不改变g-C_(3)N_(4)的骨架结构,可以增加g-C_(3)N_(4)材料的光催化性能。以橙黄II为目标污染物,在可见光下Fe-C_(3)N_(4)催化活化过硫酸钠降解偶氮染料,考察了过硫酸钠物质的量、Fe-C_(3)N_(4)质量浓度、橙黄II质量浓度及pH对降解效果的影响,并对反应进行了动力学研究,分析了所制备的催化材料的稳定性。结果表明,在Fe-C_(3)N_(4)质量浓度为2.0 g/L、过硫酸钠与污染物物质的量比为1200∶1和pH=3的条件下,降解效果最好,降解率为77.8%;Fe-C_(3)N_(4)/过硫酸钠体系对偶氮染料的降解满足准二级动力学方程;Fe-C_(3)N_(4)材料具有可重复利用性。

Ferric nitrate was used to provide iron source,and Fe‐C_(3)N_(4) composite material was prepared by impregnation method.FT‐IR was used to characterize and analyze the prepared materials.The results show that Fe doping does not change the skeleton structure of g‐C_(3)N_(4) and can increase the photocatalytic performance of g‐C_(3)N_(4) materials.Taking orange II as the target pollutant,Fe‐C_(3)N_(4) catalyzed the activation of persulfate to degrade azo dyes under visible light.The effects of persulfate dosage,Fe‐C_(3)N_(4) dosage,pollutant concentration and pH conditions on the degradation effect were examined,and the reaction kinetics was studied to analyze the stability of the prepared catalytic materials.The results show that when the Fe‐C_(3)N_(4) concentration is 2.0 g/L,the molar ratio of persulfate to pollutants is 1200∶1,and pH=3,the degradation effect is best,and the degradation rate is 77.8%;Fe‐C_(3)N_(4)/persulfate system is dual the degradation of nitrogen dyes satisfies the quasi‐second‐order kinetic equation;Fe‐C_(3)N_(4) material is reusable.