CuFe_(2)O_(4)/g-C_(3)N_(4)非均相光Fenton降解罗丹明B的研究

Heterogeneous photo-Fenton processes using CuFe_(2)O_(4)/g-C_(3)N_(4) for the degradation of Rhodamine B

采用研磨-焙烧工艺制备了CuFe_(2)O_(4)/g-C_(3)N_(4)复合催化剂,并在可见光下进行了CuFe_(2)O_(4)/g-C_(3)N_(4)非均相光Fenton体系降解水中罗丹明B(Rh B)的研究。结果表明,当复合催化剂CuFe_(2)O_(4)掺杂量为50%,复合催化剂投加量为1 g/L,H_(2)O_(2)浓度为10 mmol/L,pH=7,温度为20℃(室温)时,Rh B去除率可达92.3%,反应活化能为9.97 kJ/mol。自由基猝灭实验证明,·OH和h~+是起主要降解作用的活性物种。循环实验证实,CuFe_(2)O_(4)/g-C_(3)N_(4)具有良好的稳定性。天然日光驱动下该体系对高浓度Rh B废水(800 mg/L)的脱色率和COD去除率分别可达100%和90.52%。

A composite catalyst of CuFe_(2)O_(4)/g-C_(3)N_(4) was prepared by grinding-roasting method,and its catalytic per-formance for photo-Fenton was tested with rhodamine B(RhB)under visible light.The results showed that the removal rate of RhB could reach 92.3%and the activation energy was 9.97 kJ/mol with the condition of CuFe_(2)O_(4) content of composite catalyst 50%,the dosage of composite catalyst 1 g/L,the concentration of H2O210 mmol/L,pH=7 and the temperature 20℃(room temperature).The results of free radical scavenge experiments showed that both·OH and h+played an important role in the degradation reaction.It was confirmed that CuFe_(2)O_(4)/g-C_(3)N_(4) had good stability by cyc-ling experiment.Under the action of natural sunlight,the decolorization rate and COD removal rate of high concen-tration RhB wastewater(800 mg/L)could reach 100%and 90.52%,respectively.