轻稀土催化臭氧氧化降解甲基橙模拟废水的研究  

Research on Catalytic Ozonation of Methyl Orange-containing Simulation Wastewater by Light Rare Earth

作　　者：杨森林[1,2] 张跃春[1] 刘咏[1] 邹文慧[1] 

机构地区：[1]四川师范大学化学与材料科学学院,四川成都610068 [2]四川大学建筑与环境学院,四川成都610065

出　　处：《稀土》2013年第5期22-26,共5页Chinese Rare Earths

基　　金：国家自然科学基金项目资助(51173122);四川省高校重点实验室"先进功能材料"项目资助(KFKT2012-01);四川省教育厅重点项目资助(11ZA094)

摘　　要：采用臭氧催化氧化技术降解人工模拟染料废水。以甲基橙为目标污染物,研究了轻稀土离子(La3+、Ce3+、Pr3+)的投加量对甲基橙去除率的影响,初步探讨了Pr3+催化臭氧氧化降解甲基橙的机理。实验表明,加入一定量的La3+、Ce3+、Pr3+,对甲基橙的去除有促进作用,在初始pH=3,甲基橙溶液浓度为80 mg/L,体积为250mL,臭氧投加量为250 mg/L条件下,La3+、Ce3+、Pr3+的最佳投加量均为0.4 mmol/L,其中Pr3+的催化氧化效果最好。加入Pr3+后能促进臭氧氧化过程中羟基自由基的大量产生,从而加速甲基橙的降解,但Pr3+的加入只能促进510 nm处的吸收峰下降得更快而不能促进200 nm处的吸收峰明显的下降。Catalytic ozonation was used to degrade artificial simulation dye wastewater. The effects of light rare earth ions of La^3＋ , Ce^3＋ , Pr^3＋ on the removal rate of methyl orange were studied in a setting of methyl orange as the target pollutant. And the mechanism for catalytic ozonation of methyl orange by Pr^3＋ was researched preliminarily. The experimental resuhs show that adding a certain concentration of La^3 ＋ , Ce^3＋ and Pr^3＋ can promote the removal rate of methyl orange. The optimum dosage of La^3＋ , Ce^3＋ and Pr^3 ＋ is both 0.4 mmol/L when initial solution pH is 3,concentration of methyl orange solution is 80 mg / L, the volume is 250 mL and ozone dosage is 250 mg/L. And Pr3＋ is premium for catalytic ozonation. Adding Pr3 ~ can promote the generation of hydroxyl free radicals in the ozonatiori process, thus accelerating the degradation of methyl orange, but it can only promote the absorption peak at 510 nm to be decreased faster but not to promote the absorption peak at 200 nm to be decreased obviously.

关 键 词：臭氧 稀土 催化 染料废水 

分 类 号：O643.3[理学—物理化学] X703[理学—化学]