柠檬酸改性棉纤维铁配合物的制备及其对染料的光催化降解作用∗

摘要

Cotton woven fabric was firstly modified with citric acid by a conventional pad-dry-cure process,and then coordinated with Fe3+ ions to prepare a Fe-citric acid modified cotton fiber complex.After the characteri-zing by SEM,FT-IR,DRS and TGA,catalytic performance of the complex was evaluated as a heterogeneous Fenton catalyst for the degradation of azo dye in water.The results indicated that Fe3+ ion initial concentration and temperature enhanced the coordination of citric acid modified cotton fiber and Fe3+ ions and significantly in-creased the Fe ion content of the resulting complex.Dye degradation was significantly accelerated by the pres-ence of the complex as a heterogeneous Fenton catalyst in the dark.The catalytic performance of the complex was improved under light irradiation.Additionally,it catalytic activity was further promoted by increasing the Fe content or introduction of Cu2+ ions.%使用工业化的轧-烘-焙工艺对棉织物进行柠檬酸改性以引入羧基,然后与 Fe3＋进行配位反应制备柠檬酸改性棉纤维铁配合物。在经过SEM、FT-IR、DRS 和 TGA 表征的基础上,将柠檬酸改性棉纤维铁配合物作为非均相Fenton反应催化剂应用于偶氮染料的降解反应中,重点考察了其催化性能。结果表明,Fe3＋初始浓度和反应温度的提高均有利于柠檬酸改性棉织物与Fe3＋之间的配位反应,并能够显著增加配合物的铁离子含量。柠檬酸改性棉纤维铁配合物作为非均相Fenton反应催化剂在暗态时能够促进偶氮染料的降解反应,辐射光能明显加强其催化活性,而增加其铁离子含量或引入Cu2＋具有进一步改善其催化活性的作用。