纳米TiO_2/涤纶海岛丝针刺无纺布光催化复合材料的制备及性能

Preparation and properties of photocatalytic composites of nano TiO_2/polyester sea-island filament needle punched nonwoven

以德固赛P25纳米TiO_2为光催化材料、去离子水为介质,分别以十二烷基硫酸钠(SDS)、十二烷基苯磺酸钠(DBS)、聚乙烯毗咯烷酮(PVP)、十六烷基三甲基溴化铵(CTAB)、聚丙烯酸钠(PAAS)为分散助剂,制得系列纳米TiO_2光催化分散液。用纳米TiO_2光催化分散液对涤纶海岛丝针刺无纺布(PFN-NWF)进行二浸二轧后整理,得到TiO_2负载的PFN-NWF(TiO_2/PFN-NWF)光催化复合材料。采用激光粒度仪、TEM、SEM、拉伸、透气等表征测试,通过静置、光催化降解辣椒油和甲醛溶液等方法评价。结果表明:分散助剂自身的酸碱属性及分子结构对纳米TiO_2分散体系有重要影响,其中PAAS分散效果最佳;纳米TiO_2在PFN-NWF上包覆均匀,负载率为4.79%,负载牢度高;自然光照射60min,试样上2mL油污达到完全自清洁效果;300 W氙灯照射2h,TiO_2/PFN-NWF光催化复合材料试样对甲醛的降解率达到95.98%,5次循环使用后,降解率为90.19%。

A series of nano TiO2 photocatalytic dispersed solutions were prepared by using deionized water as a medium,sodium dodecyl sulfate（SDS）,sodium dodecyl benzene sulfonate（DBS）,ployvinylpynolidone（PVP）,cetyl trimethyl ammonium bromide（CTAB）,polyacrylic acid sodium（PAAS）surfactant as the dispersant,respectively.The TiO2 dispersed solutions were used as a finishing agent for the polyester sea-island filament needle punched nonwoven（PFN-NWF）to prepare TiO2/PFN-NWF photocatalytic composites through the twice dip-padding technique.The morphology,structure and properties of TiO2 solutions and TiO2/PFN-NWF photocatalytic composites were investigated.The capsicol and formaldehyde solution was used as a model contaminant to evaluate the photocatalytic activity of the TiO2/PFN-NWF composites.The results indicate that the dispersion system of TiO2 significantly affected by acidity-basicity of solution and dispersant,and the dispersivity of TiO2 solution can be effectively improved by addition of PAAS.The TiO2 is well immobilized on the surface of PFN-NWF and has good load fastness,the load rate of TiO2/PFN-NWF composites could be achieved 4.79%.The TiO2/PFN-NWF composites also have excellent catalytic performance.The capsicol（2 mL）drops on the surface of TiO2/PFN-NWF composites can be completely degraded under natural light irradiation for 60 min.The degradation ratio of formaldehyde is 95.98% under xenon lamp（300 W）irradiation for 3 h,and this ratio is remained above 90.19% after five cycles.