纳米TiO2/涤纶海岛丝针刺无纺布光催化复合材料的制备及性能

以德固赛P25纳米TiO₂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TiO₂光催化分散液。用纳米TiO₂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TiO₂负载的PFN-NWF （TiO₂/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TiO₂分散体系有重要影响，其中PAAS分散效果最佳；纳米TiO₂在PFN-NWF上包覆均匀，负载率为4.79%，负载牢度高；自然光照射60 min，试样上2 mL油污达到完全自清洁效果；300 W氙灯照射2 h，TiO₂/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%。

Preparation and properties of photocatalytic composites of nano TiO2/polyester sea-island filament needle punched nonwoven

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.