摘要
研究UV254光照下,Fe（Ⅲ）-EDTA/H2O2对苯酚的催化光降解效能。首先考察反应时间、溶液初始pH值、Fe（Ⅲ）与EDTA的浓度比值对UV/Fe（Ⅲ）-EDTA催化光降解苯酚的影响,进而考察UV/Fe（Ⅲ）-EDTA/H2O2体系对苯酚的降解效能。结果表明：当溶液pH为7,Fe（Ⅲ）/EDTA浓度比值为1：1时,经过1h反应,UV/Fe（Ⅲ）-EDTA体系对苯酚的催化光降解效率达61.13%。在溶液初始pH为3~7时,UV/Fe（Ⅲ）-EDTA对苯酚的降解率均可达60%以上。在中性条件下,UV/Fe（Ⅲ）-EDTA体系添加H2O2后可把苯酚的降解率从61.13%提高到91.30%。反应前后溶液的紫外扫描光谱表明光降解过程中苯酚的苯环共轭结构被破坏。最后对UV/Fe（Ⅲ）-EDTA/H2O2体系催化光降解机理进行了初步探讨。
The photo-catalytic degradation of phenol in aqueous solution by Fe（Ⅲ）-EDTA/H2O2 under irradiation of UV254 is investigated,and the effect of different factors such as the reaction time,the initial pH and the ratio of Fe（Ⅲ）/EDTA on the degradation of phenol by UV /Fe（Ⅲ）-EDTA are first studied,then the degradation efficiency by UV/Fe（Ⅲ）-EDTA/H2O2 was studied.Results indicates that phenol could be efficiently photo-oxidized by Fe（Ⅲ）-EDTA complex.After one hour,the degradation efficiency could reach 61.13 % at pH = 7 with Fe（Ⅲ）/EDTA = 1：1.When the initial pH of solution ranges from 3 to 7,the degradation efficiency could be more than 60 %.The addition of H2O2 to the system could enhance the degradation efficiency from 61.13 % to 91.30 % under neutral condition.The UV light spectrum before and after the degradation shows that the conjugated structure of benzene ring is broken.In the end the photo-catalytic mechanism of UV/Fe（Ⅲ）-EDTA/H2O2 is preliminarily discussed.
出处
《莆田学院学报》
2013年第2期105-108,共4页
Journal of putian University
基金
福建省高校服务海西建设重点项目(2008HX05)
