新型非均相炭基Fenton催化剂可见光降解甲基橙的研究  

Decoloration of methyl orange in the new composite system of ACF/Fe/Mn/H_2O_2/Visible light

作　　者：袁建军[1] 杨柳[1] 郑经堂[1] 张伟娜[1] 

机构地区：[1]中国石油大学(华东)重质油国家重点实验室,青岛266555

出　　处：《化工新型材料》2014年第7期163-165,171,共4页New Chemical Materials

基　　金：国家自然科学基金项目(20776159;21176260;51172285;20876176);国家重点基础研究发展计划(2011CB605703)

摘　　要：为了更好地了解炭基材料与铁氧化物复合光Fenton处理染料的机理,开发出更多的炭基材料与高级氧化技术相结合的复合技术,拓展复合材料的用途,以活性炭纤维为载体,硝酸铁为铁源,硝酸锰为锰源,柠檬酸为络合剂,采用溶胶-凝胶法合成了新型非均相Fenton催化剂。利用SEM、XRD表征手段对材料进行了分析,并使用复合材料对甲基橙进行了光Fenton催化实验。探讨了新型催化剂在模拟太阳光下对甲基橙染料的降解情况,考察了过氧化氢的含量、pH值、Mn氧化物对甲基橙降解的影响,分析了其反应机理,研究了其循环使用的稳定性。结果表明:溶胶-凝胶法可以在ACF表面成功负载Fe和Mn的氧化物;复合光Fenton催化剂对染料的降解属于光敏化机理;在可见光下,随着过氧化氢浓度从0mmol/L到20mmol/L的提高,其降解速率逐渐增大,后期增加缓慢;在过氧化氢浓度为15mmol/L,可见光照射下,材料在溶液初始pH为3至9的范围,催化剂浓度2.4g/L,对100mg/L染料的去除都有70%以上的去除效果;锰的添加对脱色效果具有促进作用;重复使用材料5次,其脱色效果仍然保持在90%以上。In order to understand the removal mechanism of methyl orange in the new composite system of ACF/ Fe/Mn/H2O2/Visible light, developed more composite technology combining carbon materials with advanced oxidation processing, and expanded the application of the material. The composite ACF/Fe/Mnwas prepared by sol-gel adsorption method and characterized by SEM and XRDThe degradation of methyl orange in the new composite system was studied. The decoloration efficiency of methyl orange was evaluated in different H2O2 concentration and pH value. The effect of Mn on the decoloration efficiency of methyl orange was considered and the repeated use of catalyst was researched. The results showed that the iron and manganese oxides successfully loaded on ACF. The decoloration mechanism of methyl orange in this new system was due to the photosensitization mechanism. The decoloration efficiency of methyl orange was raised with the in- crease of H2 02 concentration and decreased with the increase of pH value. The decoloration efficiency of 100mg/L methyl orange in the pH ranged 3to9 was above 70% when catalyst dosage was 2.4g/L. The addition of Mn can promote the decol- oration of methyl orange. The decoloration efficiency of methyl orange still can reach 90 % after 5 times repeated use of catalyst.

关 键 词：炭基材料 非均相FENTON 可见光 甲基橙 协同作用 

分 类 号：X703[环境科学与工程—环境工程]