含铁纳米纤维电极去除水中孔雀石绿

Removal of Malachite Green by Iron-containing Nanofiber Electrode

作为一种典型的三苯甲烷类染料,孔雀石绿具有降解难度大、对生态环境和人类危害大等特点,因此水中孔雀石绿的治理问题不容忽视。本工作借助静电纺丝技术和液相还原法,将纳米铁颗粒物负载于高度蓬松的PVA纳米纤维,制备高性能的含铁纳米纤维,并利用其作为第三维电极构建三维电极反应体系,考察三维电极体系中孔雀石绿的去除行为。结果表明,未接通电源时含铁纳米纤维对水中孔雀石绿具有良好的吸附效果,吸附行为符合准二级动力学模型;在三维电极体系中,含铁纳米纤维先借助吸附作用对水中孔雀石绿进行富集浓缩,然后通过电解作用同时实现孔雀石绿的降解和含铁纳米纤维活性位点的再生。在预吸附-电解40 min后,水中孔雀石绿的去除率超过了95%,且反应体系呈现出较强的pH值耐受性。

As a kind of typical triphenylmethane dye,malachite green is difficult to be degraded,and is harmful to ecological environment and human beings.Therefore,the removal of malachite green in water cannot be ignored.In this work,high-performance iron-containing nanofibers were prepared via loading iron nanoparticles onto highly fluffy PVA nanofibers by electrospinning and liquid-phase reduction method.Then the three-dimensional electrode system was constructed using iron-containing nanofibers as the third-dimensional electrode and the removal of malachite green in the three-dimensional electrode system was investigated.The results showed that the iron-containing nanofibers had a good adsorption effect on malachite green in water,and the adsorption behavior followed the pseudo-second-order kinetic model.In the three-dimensional electrode system,the malachite green molecules could be enriched on the surface of iron-containing nanofibers by adsorption,and then the degradation of malachite green and the regeneration of activity sites on iron-containing nanofibers were simultaneously realized by subsequent three-dimensional electrolysis.After pre-adsorption and electrolysis for 40 min,the removal rate of malachite green in water reached 95%,and the reaction system showed strong pH tolerance.