铁改性PTFE纤维催化剂在偶氮染料氧化降解反应的应用  

USAGE OF Fe MODIFIED PTFE FIBEROUS CATALYST FOR OXIDATIVE DEGRADATION OF AZO DYES

作　　者：李冰[1] 董永春[1,2] 丁志忠[1] 刘春燕[1,2] 

机构地区：[1]天津工业大学纺织学院纺织化学与生态研究中心,天津300160 [2]福州大学光催化国家重点实验室培育基地,福州350002

出　　处：《太阳能学报》2013年第11期1957-1963,共7页Acta Energiae Solaris Sinica

基　　金：天津市应用基础与前沿技术研究计划重点项目(11JCZDJC24600);国家自然科学基金(2020773093)

摘　　要：使用丙烯酸对聚四氟乙烯(PTFE)纤维进行接枝反应,并将所得接枝PTFE纤维与三氯化铁反应得到铁改性PTFE纤维。然后将其作为非均相光Fenton催化剂应用于不同结构水溶性阴离子型偶氮染料的降解反应中,重点考查在不同辐射光下催化剂的铁离子含量、pH值和染料分子结构对染料降解性能的影响。通过紫外可见光谱和TOC测定研究染料降解反应过程。结果表明,铁改性PTFE纤维在辐射光(尤其是紫外光)条件下能显著催化偶氮染料的降解反应,不仅可使其分子结构破坏,而且还可使之矿化;铁离子含量的提高可加快染料的降解;催化剂在pH≤6.0溶液中具有较高的催化活性,而在碱性介质中活性有所降低;此外在催化剂存在时染料降解性能主要取决于其偶氮基的数目。PTFE fiber was grafted with acrylic acid, and then the resulting grafted PTFE fiber reacted with ferric chloride to prepare a Fe modified PTFE fiber, which was used then as the heterogeneous photo-Fenton catalyst for the oxidative degradation of the water-soluble anionic azo dyes with different strucatures in water. Effect of Fe content, the solution pH and dye structure characteristics on dye degradation was examined with respect to the decoloration percentage under different light irradiations. Photocatalytic degradation procedure of azo dye was also investigated by using UV-Visible spectrum and TOC measurement in this work. The results indicated that Fe modified PTFE fiber showed a better catalytic performance on azo dye degradation under light irradiations, especially UV light, which led to the decomposition and mineralization of dye molecules. Increasing Fe content would significantly accelerate dye degradation. Fe modified PTFE fiber has the high photocatalytic activity at pH ≤ 6. 0 solution, however, its activity was reduced unsignificantly at alkaline medium. In addition, the photocatalytic degradation of azo dyes was determined by the numbers of azo linkages in their molecules in the presence of Fe modified PTFE fiber.

关 键 词：改性PTFE纤维 铁离子 催化性能 染料降解 

分 类 号：O643.2[理学—物理化学] X703[理学—化学]