Mn(II)-Fe(II)-MCF的制备及催化性能

以改性玉米苞叶纤维为载体(MCF),负载Mn(II)和Fe(II)制备了Mn(II)-Fe(II)-MCF复合材料,催化H₂O₂氧化水中染料。通过傅立叶变换红外/近红外成像系统和扫描电子显微镜对其结构和形貌进行表征。实验结果表明:当染料浓度为10 mg·L^-1,Mn(II)-Fe(II)-MCF用量为4 g·L^-1,H₂O₂初始浓度为1.56 mmol·L^-1,Mn(II)-Fe(II)-MCF对四种染料的催化效率明显不同。阳离子蓝X-GRRL(CBX-GRRL)降解效果最好,其次是甲基橙(MO)、次甲基蓝(MB)和罗丹明B(RhB)。对染料的氧化反应进行动力学分析,MO的降解反应为二级反应,CBX-GRRL、MB和RhB的降解反应均为一级反应。Mn(II)-Fe(II)-MCF适合催化氧化偶氮染料废水。

Preparation and catalytic performance of Mn(Ⅱ)-Fe(Ⅱ)-MCF

With modified corn bract fibrous as raw materials,supported Mn(II)and Fe(II)(Mn(II)-Fe(II)-MCF)catalyst was prepared and was applied to oxidize dyes in H₂O₂ system.The product was characterized by Fourier transform infrared near infrared imaging system(FTIR)and scanning electron microscope(SEM).The experimental results showed that a 10 mg·L^-1 dye solution mixed with 4 g·L^-1 of catalyst and 1.56 mmol·L^-1 H₂O₂ for 60 min,the efficiencies of Mn(II)-Fe(II)-MCF in degradation of different dyes were markedly different.The dye degradation rates followed the order of cationic blue X-GRRL>MO>MB>RhB.By the oxidation reaction kinetic analysis of dyes,the degradation reaction of methyl orange was secondary,and the degradation reactions of cationic blue X-GRRL,methyl-blue and rhodamine B were all primary.Mn(II)-Fe(II)-MCF was suitable for treatment of azo dye wastewater.