CAJ | 학술논문

利用添加了嵌段共聚物P123、F127及硝酸的双氧水溶液直接氧化钛金属基体制备不同纳米形貌TiO2光催化薄膜.采用X射线衍射(XRD)、扫描电镜(SEM)、紫外-可见漫反射光谱(UV-Vis DRS)等技术分析样品的微观结构和形貌,以光催化降解若丹明B测定薄膜的光催化性能.结果表明,Ti-H2O2反应体系中仅添加嵌段共聚物的薄膜结晶呈树枝状,加入硝酸后薄膜形成纳米花结构.450℃C热处理后,薄膜为锐钛矿与金红石的混晶结构,平均晶粒尺寸在12～20 nm之间.薄膜的间接禁带宽度为2.65～2.85 eV,显著低于TiO2块体.添加P123获得的薄膜的光催化性能优于添加F127的薄膜.
이용첨가료감단공취물P123、F127급초산적쌍양수용액직접양화태금속기체제비불동납미형모TiO2광최화박막.채용X사선연사(XRD)、소묘전경(SEM)、자외-가견만반사광보(UV-Vis DRS)등기술분석양품적미관결구화형모,이광최화강해약단명B측정박막적광최화성능.결과표명,Ti-H2O2반응체계중부첨가감단공취물적박막결정정수지상,가입초산후박막형성납미화결구.450℃C열처리후,박막위예태광여금홍석적혼정결구,평균정립척촌재12～20 nm지간.박막적간접금대관도위2.65～2.85 eV,현저저우TiO2괴체.첨가P123획득적박막적광최화성능우우첨가F127적박막.
Various nanostructured titania thin films were fabricated by direct oxidation of metallic Ti substrates in hydrogen peroxide solutions with the additives of nitric acid and block copolymers of P123 or F127.X-ray diffraction (XRD),scanning electron microscopy (SEM) and ultraviolet-visible diffuse reflectance spectra (UV-Vis DRS) were utilized to analyze the morphology and structure of the titania films.photocatalytic properties of the thin films were evaluated by the degradation of rhodamine B in water under the illumination of a high-pressure mercury lamp.The film only with the block copolymer additive consists of rod-like titania; while flower-like titania aggregates are achieved when both block copolymers and nitric acid are added to the hydrogen peroxide solution.After a subsequent calcination at 450 ℃,all the titania films are crystallized further to a mixture of anatase and rutile with a similar average grain size.An indirect bandgap of 2.65-2.85 eV is estimated for the present films,which is significantly lower that of the bulk titania.The titania film derived with the P123 additive shows higher photocatalytic activity than that with the F127 additive,either with or without the additive of nitric acid.