非织造布表面形貌可控氧化锌纳米粒子的构筑

为制备分散性良好的氧化锌(ZnO)复合光催化材料,采用一步法混合聚丙烯纺粘非织造布(PPEN)和锌铵溶液,通过直接沉淀法负载具有不同形貌和光催化性能的氧化锌纳米粒子。借助扫描电子显微镜、X射线衍射仪、热重分析仪及紫外-可见漫反射光谱仪考察反应温度对样品微观形貌、分散性、结晶性、热稳定性和光催化性的影响。结果表明:经75 ℃处理后棒状ZnO微米粒子均匀包覆在非织造布表面;经75 ℃处理得到的PPFN/ZnO复合材料较60、90 ℃在X射线衍射特征峰处有着更尖锐的峰型,结晶度为88.0%,其最大降解温度由287.2 ℃提高到392.9 ℃,增加了105.7 ℃;对亚甲基蓝染料光催化降解8 h后降解率达到96.04%。

Preparation of controllable ZnO nanoparticles on surface of nonwovens

In order to prepare ZnO composite photocatalytic material with good dispersibility, a one-step method was adopte to mix polypropylene spunbonded nonwoven fabric (PPEN) and zinc ammonium solution, influences ZnO nanoparticles with different morphologies and photocatalytic properties were loaded by direct precipitation. The influences of reaction temperature on the morphology, dispersibility, crystallization, thermal stability and photocatalytic properties of ZnO particles on the surface of the fibers were investigated by scanning electron microscopy, X-ray diffractometer (XRD), thermogravimetric analyzer and UV-visible diffuse reflectance spectroscopy. The results show that rod-shaped ZnO microparticles are uniformly coated on the surface of the nonwoven fabric after treatment at 75 ℃, and the PPFN/ZnO composites obtained at 75 ℃ have sharper peaks on the XRD chart than those obtained at 60 ℃ and 90 ℃, whose crystallinity is 88.0%. Furthermore, its maximum degradation temperature increases from 287.2 ℃ to 392.9 ℃, with an increase of 105.7 ℃, and the PPFN/ZnO composites obtained at 75 ℃ has a degradation ratio of 96.04% after photocatalytic degradation of methylene blue dye for 8 h.