超声(US)/Fe-Ni-Ce复合催化剂降解甲基橙废水的性能研究

Degradation of methyl orange wastewater by Fe-Ni-Ce catalyst combined with US

以硝酸盐为原料,γ-Al_2O_3为载体,采用浸渍法制备一系列铁基复合催化剂。采用高级催化氧化法,H_2O_2为氧化剂,将制备的催化剂用于降解甲基橙废水。并对该降解反应的动力学及热力学进行探究。结果表明:制备的铁基催化剂均具有良好的催化活性,其中,以三元催化剂Fe-Ni-Ce的活性最好:在298 K,pH=6的条件下,反应40 min,甲基橙的降解率达到了98.99%。降解反应符合一级动力学方程,且降解反应为放热反应,表观活化能Ea=14.92 k J/mol。超声对高级氧化反应有良好的促进作用,催化剂不易失活,可循环使用。

In this thesis,a series of Fe-based composite catalyst were prepared by impregnation method using nitrate and γ-Al2O3 as the carrier. And the degradation of methyl orange was investigated by advanced catalytic oxidation method with H2O2 as oxidant. The kinetics and thermodynamics of this reaction were also presented in the paper. Results indicated that all the Fe-based catalysts have good catalytic activity,and the Fe-Ni-Ce catalyst showed the highest activity,whose methyl orange removal rate reached 98. 99% when reaction time was 40 min under the condition of 298 K and pH 6. The degradation of kinetics methyl orange in water was found to be the first-order and the degradation process was exothermic,its apparent activation energy Eawas 14. 92 k J / mol. The ultrasonic wave has a good role in promoting the ACOM. And the catalyst was not only high active,but also repeatable.