【摘要】 研究制备铈铁氧化物催化剂,对材料微观结构与组成进行分析,并用于催化湿式氧化处理医药废水。结果表明,铈铁氧化物比表面积大,Ce和Fe主要以氧化物晶体矿物相存在,催化材料具有纳米微观结构。催化剂量、反应温度与时间对催化湿式氧化体系影响显著。催化剂量1～4 g/L时,污染物去除率随催化剂量增加而增大,催化剂量为4 g/L时,催化湿式氧化对TOC与COD去除率比湿式氧化均提高近45%。不同温度下催化湿式氧化去除效果均高于湿式氧化。反应温度低于200℃时,2个体系对废水TOC与COD去除率随温度升高而增加;2个体系污染物去除率随反应时间增加均逐渐提高,而TOC与COD平均去除速率随反应时间延长而整体下降。2级动力学方程可较好拟合2个体系对废水处理过程。更多还原

【Abstract】 The cerium iron oxide catalyst was prepared, and the microstructure and composition of the materials was analyzed. The catalyst was applied to catalytic wet air oxidation treatment of pharmaceutical wastewater. The results showed that, the cerium iron oxide catalytic material had a large specific surface area; Ce and Fe mainly existed in the form of oxide crystal mineral phase, and the catalytic material had a nano-microstructure. The amount of catalyst, reaction temperature and reaction time had significant effect on catalytic wet air oxidation treatment of pharmaceutical wastewater. When the amount of catalyst was from 1 to 4 g/L, the removal rate of pollutants was enhanced with the increase of catalyst amount. Catalytic wet air oxidation improved the removal rates of TOC and COD by nearly 45% compared to the wet air oxidation as the catalyst amount was 4 g/L. The removal efficiency of catalytic wet air oxidation at different reaction temperatures was higher than that of wet air oxidation system. The TOC and COD removal rates of two systems increased with the increase of reaction temperature when the reaction temperature was lower than 200 ℃. The removal rate of pollutants in pharmaceutical wastewater by both systems increased gradually with the increase of reaction time. The average removal rate of TOC and COD decreased as the reaction time extended. The second-order kinetic equation could better fit the process of two systems on pharmaceutical wastewater treatment.更多还原