Abstract

The treatment of dyes in wastewater is important to solve environmental problems. Advanced oxidation processes has been proved to be an effective treatment. In this work, a novel nanocomposite catalyst of ZIF-9@Fe₃O₄ (cobalt-containing zeolitic imidazolate framework-9 coated Fe₃O₄ nanocomposite) modified reduced graphite oxide (RGO) was prepared for the first time and coded as ZIF-9@CA-Fe₃O₄/RGO. Then, ZIF-9@CA-Fe₃O₄/RGO was immobilized on a cellulose membrane to obtain a composite membrane, which was used as a composite catalyst for activating peroxymonosulfate to degrade methylene blue (MB). The results demonstrated that the composite membrane could efficiently degrade approximately 96% of MB in 9 min without adjusting the initial pH and maintain good catalytic activity even after seven cycles. Furthermore, the composite membrane can be easily separated from the solution at the end of the reaction. This work indicates that the composite membrane has a broad application prospect in industrial applications.

Graphic abstract

摘要

废水中染料的处理对于解决环境问题很重要。先进的氧化工艺已被证明是一种有效的处理方法。在这项工作中，首次制备了新型的ZIF-9 @ Fe ₃ O ₄纳米复合催化剂（含钴的沸石咪唑酸盐骨架9包覆的Fe ₃ O ₄纳米复合材料）改性的还原氧化石墨（RGO），其编码为ZIF -9 @ CA-Fe ₃ O ₄ / RGO。然后，ZIF-9 @ CA-Fe ₃ O ₄将/ RGO固定在纤维素膜上以获得复合膜，其用作活化过氧单硫酸盐以降解亚甲基蓝（MB）的复合催化剂。结果表明，该复合膜可在9分钟内有效降解约96％的MB，而无需调节初始pH值，即使经过7个循环也能保持良好的催化活性。此外，在反应结束时可以容易地将复合膜与溶液分离。这项工作表明复合膜在工业应用中具有广阔的应用前景。

图形摘要