利用原位氧化聚合法制备pdyaniline( PANI)/TiO2和poly-o-phenylenediamine( PoPD)/TiO2纳米材料,通过XRD、元素分析、UV-Vis DRS和循环伏安曲线等方式进行表征,以亚甲基蓝为模拟污染物,考察pH值以及导电聚合物/TiO2浓度对光催化效果的影响,通过捕捉实验判定不同活性物种在光催化过程中的贡献.结果表明,PANI和PoPD没有改变TiO2的粒径和物相,PANI/TiO2、PoPD/TiO2和TiO2的禁带宽度分别为2.82 eV、2.89 eV和3.09 eV;溶液pH值越高,导电聚合物/TiO2纳米材料的光催化活性越高;PANI/TiO2和PoPD/TiO2纳米材料浓度在光催化降解过程中存在的最佳值分别为1 g·L-1和1.5 g·L-1 ,PANI/TiO2和PoPD/TiO2纳米材料光催化过程中活性氧物种的贡献顺序分别为·OH > h+>·O-2 ,·OH ≈ h+>·O-2 .重复利用实验结果表明制备的PANI/TiO2和PoPD/TiO2纳米材料具有良好的光催化稳定性.导电聚合物和TiO2之间的协同-光敏化作用是CPs/TiO2纳米材料光催化活性得到提高的主要原因.
Polyaniline ( PANI ) and poly-o-phenylenediamine ( PoPD ) modified TiO2 nanocomposites were synthesized via 'in situ ' oxidative polymerization method. The prepared nanocomposites was characterized by X-ray diffraction ( XRD) , elemental analysis ( EA) , UV-Vis diffuse reflectance spectrum ( DRS ) , and cyclic voltammetry ( CV ) . The photocatalytic activity of the prepared nanocomposites was evaluated by photocatalytic degradation of methylene blue ( MB ) . The effects of initial pH value and conducting polymer ( CPs)/TiO2 concentration were evaluated, and the contribution of reactive oxidation species was determined by using trap experiment. The results indicated that the presence of PANI and PoPD did not have any impact on the crystalline grain and phase of TiO2 . The estimated band gap values of the nanocomposites were approximately 2.82 eV, 2. 89 eV and 3. 09 eV for PANI/TiO2, PoPD/TiO2 and TiO2 respectively. The photocatalytic degradation rate of MB increased with initial pH value from pH 3.5 to pH 11.5. The optimum concentrations of PANI/TiO2 and PoPD/TiO2 nanocomposites were 1 g·L-1 and 1.5 g·L-1, respectively. The order of ROS contribution was ·OH >h+>·O-2 for PANI/TiO2, and ·OH≈h+>·O-2 for PANI/TiO2. In addition, PANI/TiO2 and PoPD/TiO2 nanocomposites showed excellent photocatalytic stability after 5 recycle times under light irradiation. The synergetic-photosensitization effect between conducting polymer and TiO2 was a key reason for the enhamced photocatalytic activity of CPs/TiO2 nanocomposites.
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