新型生物电Fenton法降解偶氮染料:铁复合碳毡阴极研究  

Using a novel bioelectro-Fenton system to degrade azo dyes: effects of iron/carbon felt composite cathode

作　　者：王跃强[1] 胡勇杰 李进 杜潮 徐荣险[1] 雷发懋 

机构地区：[1]广东省生态环境与土壤研究所,广东广州510650 [2]广东产品质量监督检验研究院,广东广州510330

出　　处：《生态环境学报》2013年第5期826-831,共6页Ecology and Environmental Sciences

基　　金：广东省科技攻关项目(2012B030800008;2012B010500035);广东省质量技术监督局科技项目(2011cz08)

摘　　要：传统电Fenton反应通过电化学方法产生H2O2,需外加电源,能耗大,成本高。基于MFC持续产电并可驱动阴极电Fenton系统运行的特点,本研究以铁复合碳毡为阴极电极,构建了微生物燃料电池驱动的生物电Fenton系统,探讨了铁复合碳毡及阴极pH对偶氮染料(金橙I号)脱色的影响。结果发现,铁复合碳毡脱色效果均好于普通碳毡。当pH为3时,4 h后Fe@Fe2O3/CF阴极脱色率达91.7%,明显高于α-FeOOH/CF和FeAlSi/CF的83.4%和69.9%。扫描电镜发现,Fe@Fe2O3以微粒状结构附着于碳毡表面,比表面积增大,可能是Fe@Fe2O3/CF脱色性能改善的主要原因。研究表明,低pH有利于生物电Fenton反应的进行。当pH由3.0提高至5.0时,Fe@Fe2O3/CF阴极脱色率降低至47.1%。阴极室染料脱色与阳极室废水TOC削减呈线性相关,说明阳极生物氧化是驱动阴极生物电Fenton反应的原动力。本研究提供了一种能自我维持、无需外源电力的生物电Fenton系统,为印染废水脱色提供了崭新的途径。H2O2 is produced by electrochemical methods in traditional electro-Fenton reactions, which require external electricity and are not cost-effective. Based on that MFC can continuously generate electricity and keep the cathode electro-Fenton system nmning, in this project, iron/carbon felt （CF） was used as the cathode to set up a bioelectro-Fenton system driven by MFC. Effects of iron/CF and cathode pH on the decolorization of azo dye （Orange I） were study. Results showed that iron/CF were better than conventional CF in azo dye decolorization. At pH 3, decolorization rate of 91.7% was achieved after 4 h for Fe@Fe2O3/CF cathode, significantly higher than those of ct-FeOOH/CF （83.4%） and FeA1Si/CF （69.9%）. SEM images showed that Fe@Fe2O3 microparticles were attached on the CF. The improved decolorization rate achieved by Fe@Fe2O3/CF cathode can be resulted from the increased specific surface area. Results showed that, low pH is favorable for the bioelecto-Feton reaction. When pH went up from 3.0 to 5.0, decolorization rate achieved by the Fe@Fe2O3/CF cathode dropped to 47.1%. There was a linear relationship between the decolorization rate in the cathode chamber and the decrease of wastewater TOC in the anode chamber, indicating that biooxydation is the driving force for the bioelectro-Fenton reaction in the cathode. This study presents a self-maintained and no external electricity-requiting bioelectro-Fenton system, which provides a new way for printing and dying wastewater decolorization.

关 键 词：铁复合碳毡 生物电Fenton系统 金橙I号 脱色降解 

分 类 号：X78[环境科学与工程—环境工程]