改性PTFE纤维金属配合物的制备及其光催化降解性能  

Preparation of Grafted PTFE Fiber Metallic Complexes and Their Photocatalytic Degradation Abilities

作　　者：丁志忠[1] 董永春[1,2] 李冰[1] 李淼[1] 

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300387 [2]福州大学光催化国家重点实验室培育基地,福州350002

出　　处：《物理化学学报》2013年第1期157-166,共10页Acta Physico-Chimica Sinica

基　　金：天津市应用基础与前沿技术重点研究计划(11JCZDJC24600);国家自然科学基金(20773093)资助项目~~

摘　　要：使用聚丙烯酸接枝改性聚四氟乙烯(PAA-g-PTFE)纤维分别与Fe3+及其与Cu2+的混合物反应制备改性PTFE纤维铁和铁铜双金属配合物,并分别使用傅里变换叶红外(FTIR)光谱和紫外-可见(UV-Vis)漫反射光谱(DRS)对两种配合物的化学结构和光吸收性能进行表征.然后将两种配合物分别作为非均相光Fenton反应催化剂应用于典型偶氮染料活性蓝222氧化降解反应中,考察和比较了二者在不同pH介质中对降解反应的催化作用.结果表明,在有或无Cu2+的存在条件下,一个Fe3+能够与三个PAA-g-PTFE表面的6个羧基发生反应形成配合物,并且它们在紫外和可见光区表现出好的光吸收特性.当两种金属离子共存时Cu2+比Fe3+更容易与PAA-g-PTFE发生配位反应形成铁铜双金属配合物.在可见光辐射下PAA-g-PTFE铁配合物对不同pH水溶液中染料降解反应均表现出显著的催化作用,但是溶液pH的升高不利于配合物催化活性的发挥.而配合物中铁离子含量提高特别是引入Cu2+作为助金属离子能够较大幅度地改善其在高pH范围内的催化活性和重复利用性.Polyacrylic acid grafted polytetrafluoroethylene （PAA-g-PTFE） fibers were coordinated with Fe3＋ ions and with a mixture of Cu2＋ and Fe3＋ ions to prepare PAA-g-PTFE Fe and Cu-Fe bimetallic complexes. The chemical structures and light adsorption properties of the complexes were characterized using Fourier transform infrared （FTIR） spectrometry and UV-Vis diffuse reflection spectroscopy （DRS）, respectively. The complexes were used as heterogeneous photo-Fenton catalysts in the oxidative degradation of the azo dye, Reactive Blue 222, in different pH aqueous media. The results indicate that Fe3＋coordinates with six carboxyl groups grafted on the surface of PAA-g-PTFE in the presence or absence of Cu2＋ ion, and improved light adsorption properties are achieved in the UV and visible regions. When both metal ions coexist in solution, the Cu2＋ ion coordinates more easily with PAA-g-PTFE than Fe3＋ to produce a PAA-g-PTFE Cu-Fe bimetallic complex. Moreover, PAA-g-PTFE Fe significantly increases the degradation of Reactive Blue 222 in the pH range 3-9 under visible irradiation. However, at high pH conditions （〉7） the catalytic ability is reduced. Increasing the Fe content, and especially incorporating Cu2＋ ions in the complex, dramatically improves the catalytic reusability at high pH value.

关 键 词：聚四氟乙烯纤维 金属配合物 配位结构 光催化 FENTON反应 染料降解 

分 类 号：O641.4[理学—物理化学] O643.32[理学—化学]