高效复合tiolt2gt光催化剂的制备及其光催化性能分析.docx

摘 要
本文分别用溶胶一凝胶法和水热法制备了纳米TiO:粉体光催化剂,通过正交实验初步探讨了反应物料比、、比表面积、晶型和光催化活性的影响。利用悬浮聚合法制备了具有吸附活性的粉煤灰一聚苯乙烯微珠载体,并通过矿化接技技术将纳米TiO:光催化剂附着其上,制备了复合型催化剂,,并用可溶陛高导电聚笨胺对其进行可见光改性研究。以甲醛模拟废水为研究对象,考察了纳米Ti0:光催化氧化对降解水中有机物的效果,以及载体的活性和导电聚苯眩掺杂对复合催化荆催化性能的影响。利用红外吸收光谱、SEM、XRD、比表面积测定仪等手段对其进行表征。实验结果表明,TiO:在载体上分散良好,粒子颗粒均匀,纳米TiO。粒径大小在30~60nm 之间。可溶性高导电聚苯胺掺杂可有效提高纳米TiO。光催化剂对太阳光的利用率。
采用悬浮聚合法制备粉煤灰一聚苯乙烯复合微珠载体,粒径大小可控:载体中的粉
煤灰表面积大,吸附性强,含有Fe等过渡金属活性成分,可提高催化剂光催化活性。通过接枝技术在载体和光催化剂之间形成纤维状大分了薄膜,,使复合光催化剂具有较长的使用寿命,解决了纳米Ti07粉体固定化和再利用团难的问题,为将来的工业化和商业化奠定了基础。
关键词:纳米TiO:,溶胶凝胶法,水热法,复合光催化剂,可见光
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Abstract
Nanosized titania powder was prepared by and hydrothermal precipitation method in the of several factors such as reactants temperature and calcinations temperature,on the particle size,surface area,crystal type and photocatalytic performance of the titania powder were investigated by orthogonal experiment COal microspheres carrier with the size of ~10 mm was prepared through suspension grafting and mineralization on the substrate,the nanosized titania film was anchored on the surface of the microspheres,and the modification ofvisible light photocatalytic was studied through
hi曲conducting polyaniline simulated wastewater with formaldehyde Was used
to test the photocatalytic performance of the nanosized Ti02,and the effects of the
activity of carriers and the conducting polyaniline doping on the photocatalytic performance were crystal phase,grain size and morphology of the prepared powders were studied by infra-red, and surface area results revealed that the particles were well distributed in the surface of the support and the
equality of the particle sizes Was very particle diameter ranges from 30 t0 60 was also found that high conducting polyaniline doping could improve the nanosized Ti02 catalyst’s utilizat