铁离子的固定化及其对孔雀石绿的光-Fenton降解

Immobilization of Iron Ions and Its Photo-Fenton Degradation on Malachite Green

将Fe(Ⅱ)离子负载到NaY分子筛上,经交换反应制备了一种含铁的异相光-Fenton催化剂FeY。研究结果表明该催化剂在紫外光照射下对孔雀石绿有良好的光降解作用,在孔雀石绿浓度为6 mg/L,H2O2浓度为0.01 mol/L的反应体系中,加入1.0 g的催化剂,白光照射40 min,孔雀石绿的降解率达99.0%。进一步的研究表明孔雀石绿的降解反应呈现出一级反应的动力学特征,表观动力学常数为0.026 26 min-1。重复的循环实验表明,一步离子交换法制备得到的催化剂其性能稳定可靠。

A heterogeneous Fenton-catalyst was prepared by loading Fe^2＋ on a NaY zeolite denoted as FeY. The results showed that the catalyst presented a good light degradation on the malachite green： the degradation ratio was 99.0% in the reaction system when the malachite green was 6 mg/L, H2O2 was 0.01 mol/L, with the addition of the catalyst 1.0 g and irradiation under the white light for 40 min. Further study shows the degradation reaction obeys the pseudo-first order reaction law, the apparent kinetic constant is 0.026 26 min^-1. The repeated ex- periments show that the catalyst prepared by the ion exchange reaction is very stable.