负载β-FeOOH/Fe3O4的纤维素/壳聚糖复合气凝胶的制备及其对甲基橙降解性能研究

Preparation of Cellulose/Chitosan Composite Aerogels Loaded with β-FeOOH/Fe3O4 and Degradation Performance of Methyl Orange

关键词:  纤维素  多态铁  复合气凝胶  光催化

Key Words:cellulose  polymorphic iron  composite aerogel  photocatalysis

摘要:本研究以纤维素/壳聚糖气凝胶（CCG）为基底，负载可见光催化剂β-FeOOH/Fe₃O₄，制备β-FeOOH/Fe₃O₄@CCG复合气凝胶，构筑光Fenton体系提高催化效能。系统研究了不同β-FeOOH/Fe₃O₄质量比以及不同负载量复合气凝胶对甲基橙（MO）的降解效果，并阐述了光Fenton降解机理。结果表明，在光Fenton降解中，随着β-FeOOH/Fe₃O₄负载量的增加，MO降解率提高。当β-FeOOH/Fe₃O₄的质量比为2∶1时，复合气凝胶降解能力最高，MO降解率达到89.1%。自由基捕获结果表明，光诱导降解MO的主要活性物质为羟基自由基。

Abstract:The study mainly developed the preparation of cellulose/chitosan composite aerogels loaded with visible light catalyst β-FeOOH/Fe₃O₄， which was subsequently used as a phototropic Fenton-like system to improve the catalytic efficiency. The degradation effect of composite aerogels on methyl orange （MO） with different β-FeOOH/Fe₃O₄ mass ratios and different loadings was systematically investigated， and the phototropic Fenton-like degradation mechanism was elaborated. The results showed that in phototropic Fenton-like degradation， the degradation rate of MO increased with the increase of loadings. When the mass ratio of β-FeOOH/Fe₃O₄ was 2∶1， the degradation ability attained the optimum state， with a degradation rate of 89.1%. The results of free radical trapping experiments showed that the main active subtances for photo-induced degradation of methyl orange could be attributed to hydroxyl radicals.