多相类芬顿纳米催化剂铁酸铋降解木素模型物

Efficiency Degradation of Lignin Model Pollutants with BiFeO_3 Nanoparticles as a Heterogeneous Fenton-Like Catalyst

多相类Fenton催化技术可有效降解有机污染物,在多相类Fenton催化剂中含铁催化剂可催化活化过氧化氢,具有较好的催化效果。本文用含铁催化剂铁酸铋催化活化过氧化氢,利用产生的羟基自由基等强氧化活性物种降解造纸工业中污水的主要有机污染物-木质素类污染物的模型物(阿魏酸),探讨了对其降解的可能性,并研究了反应条件(铁酸铋用量、双氧水用量、温度、p H值等)对降解效果的影响,并进一步研究了该催化剂的稳定性、可回收性和循环使用性能。结果表明:铁酸铋可高效催化降解阿魏酸,且该催化剂易于回收,结构稳定,可多次循环使用,具有较好的应用前景。

Heterogeneous Fenton-like process possess strong catalytic activity during the degradation of organic pollutants. Among the heterogeneous Fenton-like catalysts, the catalysts contained iron ions could activate H2O2, which possess better catalytic effect. In this study, BiFeO3 which contained iron ions was used to activate H2O2 as a heterogeneous Fenton-like catalyst. And the produced strong oxidizing active species such as hydroxyl radicals were used to degrade lignin which was the main organic pollutants in papermaking sewage water. The possibility of degrading lignin model pollutants （ferulic acid） with heterogeneous Fenton-like process was discussed in this paper. And the effect of reactive condition （BiEeO3 load, H2O2 concentration, reactive temperature and pH value） to degradation was studied. Except that, the stability, returnability and recycling performance of the catalyst were further investigated. The results showed that BiFeO3 could degrade fenalic acid more efficiency. And the catalyst possess the advantages of easy recycle, stable structure and recycling use many times, which possess good application prospect, This study may provide theory and technology support to the degradation papermaking sewage water with heterogeneous Fenton-like process, which possess a certain practical significance.