纳米TiO_2/炭黑改性PET织物及其导电与光活性的表征(英文)

Conductive and photoactive properties of polyethylene terephthalate fabrics treated with nano TiO_2/nano carbon blacks

对聚对苯二甲酸乙二醇酯(PET)织物进行碱性水解预处理。通过浸渍法以十二烷基硫酸钠作为分散剂在原始的和经预处理的PET中加入纳米炭黑(CB1515和CB156),纳米二氧化钛(NTO)-NCBs(CB1515或CB156)混合物。以柠檬酸(CA)和次磷酸钠(SHP)分别为交联剂和催化剂,分别在预处理前后的PETs中加入NTO+CB1515和NTO+CB156作对比研究。结果表明,CB156比CB1515更能有效地降低样品的电阻率。加入NTO后,由原始PET所制样品比预处理PET所制样品具有更低的电阻率。然而,这与不加NTO所制样品结果相反。通过增加添加量和改善NCBs和NTO在织物中的分散均匀性,采用CA和SHP可明显降低样品的电阻率。发现NCBs与NTO的协同效应可提高预处理织物的紫外吸收。由原始PET中加入NCB和NTO所制样品比预处理的PET对亚甲基蓝降解具有更高活性。通过添加NTO或CA-SHP可提高活性,前者比后者更有效。

A polyethylene terephthalate （PET） fabric was pretreated by alkaline-hydrolyzation. Both the pristine and pretreated PETs were loaded with nano carbon blacks （CB1515 and CB156）, mixtures of nano TiO2（NTO） and NCBs （CB1515 or CB156） using an impregnation method with sodium dodecyl sulfate as a dispersing agent. Citric acid （CA） and sodium hypophosphite （SLIP） were also used as a cross-linking agent and a catalyst respectively in addition to the dispersant to load NTO＋CB1515 and NTO＋CB156 onto the PETs with and without pretreatment as comparisons. It is found that CB156 is more effective than CB1515 to decrease the electrical resistivity for all samples. The samples from the pristine PET have lower resistivities than those from the pretreated PET when NTO is added. However, this is reversed when NTO is not added. Use of CA and SHP can significantly lower the resistivity of samples in all cases by increasing the loading level and dispersion uniformity of NCBs and NTO in the fabrics. A synergistic effect of NCBs and NTO is found to increase UV absorption of the treated fabrics. The samples from the pristine PET loaded with NCBs and NTO were more active than those from the pretreated PET for the degradation of methylene blue. The activity can be increased by loading with NTO or by adding both CA and SHP and the former is more effective than the latter.