【摘要】 以不同浓度的聚乙二醇(PEG)为模板剂,采用一步水热法制备了一系列晶型和形貌可控的TiO2纳米粉体,并采用XRD、TEM、SEM、TG-DTA、IR及N2吸附-脱附等手段对样品进行了表征.结果表明,可以通过调节PEG浓度来控制对样品的形貌和晶相,且可形成具有介孔结构的纳米晶体,从而为TiO2纳米晶的可控制备提供了一个简便的方法.最佳模板剂浓度下合成的水热产物具有较高的比表面积(约279.5m2/g),在紫外光照1h后,对水中X-3B的降解率达到94.4%,比不加PEG时有较明显的增强.更多还原

【Abstract】 Nano-sized titanium dioxide powders with controllable morphology and crystallite phase were synthesized via a one-step hydrothermal process assisted by polyethylene glycol （PEG）. XRD, TEM, SEM, TG-DTA, IR and N₂ adsorption-desorption isotherms were used to character different samples. The morphology and crystallite phase of nanoparticles can be controlled by concentration of PEG in this reaction system. The mesoporous structure of obtained nanoparticles was revealed by the adsorption and desorption isotherms and the pore size distribution curve. The optimum nanocrystals were of high BET surface area （279.5 m²/g）. Photocatalytic experiments under UV light demonstrated that the sample with PEG assisted exhibited better photocatalytic degradation effect （94.4%） of X-3B than TiO₂ without PEG assisted done.更多还原