绿锈去除难降解有机物研究

Refractory Organics Removal of Green Rust

采用共沉淀法和半间歇式滴加法制备绿锈,前者制备的绿锈含有大量针状氢氧化铁副产物,后者制备的绿锈只有无定形和六边形产物,纯度更高;绿锈对甲基橙具有良好的脱色效果,反应体系p H由7提高到11,甲基橙脱色率由42%提高到81%;绿锈对甲基橙的脱色主要是通过还原作用破坏甲基橙的发色基团,无法将其矿化;将绿锈与H_2O_2组成非均相芬顿体系处理甲基橙,在反应体系为中性的条件,对甲基橙脱色率和COD去除率分别达到85%和61%.

Co-precipitation and semi-batch addition methods were developed to prepare green rust（ GR）.Green rust prepared by co-precipitation method contained a large number of acicular ferric hydroxide by-product,while that prepared by semi-batch addition method only had amorphous and hexagonal product with higher purity. The green rust has good decolorizing effect on methyl orange,and the decolorization rate is increased from 42% to 81% when p H is increased from 7 to 11. The decolorization of methyl orange by green rust is the result of destroying chromophore of methyl orange. To mineralize methyl orange,heterogeneous Fenton system consisted of hydrogen peroxide and green rust was used to treat it. Under neutral reaction condition,the decolorization rate and COD removal rate reach 85% and 61% respectively.