原位聚合PUR/纳米TiO2复合材料及其光催化性能

PUR/Nano TiO_2 Composites Prepared by In-situ Polymerization and Its Photocatalytic Performance

以聚氨酯(PUR)泡沫作为载体,利用纳米TiO_2表面丰富的羟基与二苯基甲烷二异氰酸酯中的异氰酸根反应,通过原位聚合制备了PUR/纳米TiO_2复合材料。以亚甲基蓝(MB)为模拟污染物,研究了PUR孔径、纳米TiO_2的添加量对PUR/纳米TiO_2复合材料光催化性能的影响。FTIR分析结果显示,PUR/纳米TiO_2复合材料在653 cm-1附近出现Ti—O的吸收峰,说明TiO_2成功连接到了PUR的分子链段上。SEM分析结果显示,负载了纳米TiO_2的PUR表面粗糙度增加,有利于MB的吸附,且TiO_2无脱落现象。TG/DTG分析结果显示,纳米TiO_2的加入有利于提高PUR的热稳定性。当纳米TiO_2用量为其它试剂总质量的2.00%时,PUR/纳米TiO_2复合材料最大失重速率温度从纯PUR的324.97℃升高至333.97℃。当PUR泡沫的孔径为4.2 mm、纳米TiO_2用量为其它试剂总质量的2%时,PUR/纳米TiO_2复合材料光催化降解MB的效果较优,降解120 min时的降解率为52.29%,且易于从溶液中回收,表现出较纳米TiO_2粉体不可比拟的易回收性。

Polyurethane(PUR)foam acting as the carrier,the PUR/nano TiO2composites were prepared by in-situ polymerization,in which the abundant hydroxyl groups of nano TiO2can react with isocyanato of diphenylenethane diisocyanate.Taking methylene blue(MB)as simulated contaminant,the effects of the PUR foam pore size and the amount of nano TiO2on the photocatalytic properties of PUR/nano TiO2composites were investigated.FTIR analysis results show that the absorption peak of Ti-O is found at about653cm-1in PUR/nano TiO2composite,indicating that TiO2is successfully linked to the polymer chain segment of PUR.The results of SEM analysis show that the surface roughness of PUR/nano TiO2composite increase,which is beneficial for MB to be adsorbed onto PUR.None exfoliated TiO2is found in solution.The results of TG/DTG show that the addition of nano TiO2can improve the thermal stability of PUR.The maximum weight loss rate temperature of PUR/nano TiO2composite increase from324.97℃of pure PUR to333.97℃when the amount of nano TiO2is2.00%of the total mass of other reagents.When the PUR pore size is4.2mm,the dosage of nano TiO2is2%of the total mass of other reagents,the photocatalytic efficiency PUR/nano TiO2composite for MB is better,the degradation rate can reach52.29%at120min,it is easy to be recycled from solution and shows unparalleled recyclability performance than nano TiO2powder.