The treatment of dye wastewater with traditional adsorption materials usually proceeds slowly with low removal efficiency and without completely eliminating dye molecules, leading to secondary pollution. In this work, poly(vinyl alcohol)/graphene oxide@tetraamino iron phthalocyanine (PVA/GO@TAFePc) nanocomposite hydrogels with catalytic activity were prepared via an in situ crosslinking method. Through interfacial covalent and π–π interactions, TAFePc was loaded onto GO layers with a high loading ratio, and GO@TAFePc was exfoliated and uniformly dispersed in the matrix. With increasing GO@TAFePc hybrid content, the pore size increased and a loose network structure was formed for the hydrogels, while the specific surface area rose significantly by using the hydrogel in a dye removal process, the removal rate of methylene blue (MB) increased sharply with contact time, reaching 98% in the presence of H₂O₂ with good reusability, and high removal efficiency was achieved for different dyes. The large surface area of the hydrogel was beneficial for MB adsorption. Meanwhile, under catalysis of TAFePc, a large amount of high activity ·OH was produced by H₂O₂ so as to degrade the MB molecules rapidly. Therefore, the MB degradation process for the composite hydrogel was ascribed to a dual adsorption/catalytic degradation mechanism. © 2020 Society of Industrial Chemistry

中文翻译：

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具有催化活性的聚乙烯醇/氧化石墨烯纳米复合水凝胶：染料废水的去除行为及双重吸附/催化降解机理

用传统的吸附材料处理染料废水通常进行缓慢，去除效率低，并且不能完全消除染料分子，从而导致二次污染。在这项工作中，通过原位制备了具有催化活性的聚（乙烯醇）/氧化石墨烯@四氨基铁酞菁（PVA / GO @ TAFePc）纳米复合水凝胶。交联方法。通过界面共价和π-π相互作用，TAFePc以高负载率负载在GO层上，GO @ TAFePc剥落并均匀分散在基质中。随着GO @ TAFePc杂化含量的增加，水凝胶的孔径增大，形成疏松的网络结构，而在染料去除过程中使用水凝胶则比表面积显着上升，亚甲基蓝（MB）的去除率增加。 H ₂ O ₂存在下，接触时间急剧缩短，达到98％，具有良好的可重复使用性，不同染料的去除效率高。水凝胶的大表面积有利于MB吸附。同时，在TAFePc的催化下，H产生了大量的高活性·OH。₂ O ₂从而迅速降解MB分子。因此，复合水凝胶的MB降解过程归因于双重吸附/催化降解机理。©2020工业化学学会