共轭高分子PF/TiO_2纳米复合材料的合成与催化性能

Synthesis and Catalytic Property of Conjugated Polymer PF/TiO_2 Complex Nanomaterials

用糠醇单体在TiO2纳米粒子表面的原位酸催化聚合，经适当的热活化处理，制备了共轭高分子PF／TiO2纳米复合催化材料，用TEM、FTIR、UV-Vis等技术对其尺寸、结构和光吸收特性进行了表征。在自然光、室温条件下，以亚甲基蓝（MB）的脱色、降解为模型反应，对其光催化性能进行了研究。结果表明，由该方法合成的PF/TiO2复合材料尺寸在80～140nm，其中PF为具有极性基团（-OH，C=O）和不同长度共轭链的高分子，且与TiO2以C-O-Ti相键合；由于PF的复合使该复合材料的吸收波长拓宽至整个紫外-可见光区。光催化实验结果表明，在自然光、室温条件下，该复合材料在5-10min可使MB的脱色率、COD去除率分别达到97％、75．2％以上。

A conjugated polymer PF/TiO2 complex nanomaterials was prepared via in-situ acidcatalyzed polymerization of furancarbinol（F） monomer on the surface of TiO2 nanoparticles, followed by calcination at proper temperature, and characterized by TEM, FTIR and UV - Vis techniques in regard to its size, structure and UV -Vis absorption property. Also, its catalytic activity for the degradation of dye methylene blue（MB） was studied under natural light at room temperature. The results showed that the size of PF/TiO2 complex particles was in the range of 80 - 140 nm, PF with different lengths of conjugated chains was chemically linked to TiO2 by C-O-Ti bond. Doping of PF greatly extended the photoresponse of TiO2 to the whole UV - Vis region. The catalytic activity of TiO2 was dramatically enhanced by the modification with PF, and MB could be fully decolorized and largely mineralized within 5 min, the decolorization and mineralization efficiencies of MB, respectively, reached over 97% and 75.2%.