CAJ | 학술논문

以尿素为氮源、HF为调控剂,采用水热法制备了以(001)活性面为主的氮掺杂型TiO2催化剂.SEM、TEM 、XRD、Raman及UV‐Vis测试结果表明,TiO2及N‐TiO2产品均为暴露(001)面的纳米片状锐钛矿结构,TiO2在高温900℃煅烧仍能保持锐钛矿结构.F-不仅对(001)面的暴露起到很好的调控作用,而且抑制了TiO2在高温下向金红石相的转化.氮的掺杂窄化了TiO2的禁带宽度,使其边带红移,在可见光区域有很强的吸收峰.并且,随着氮掺杂量的增多,N‐TiO2在可见光的吸收峰增强.以可见光降解染料罗丹明B溶液作为探针反应,研究了不同N/Ti配比的N‐TiO2的可见光催化活性,氮掺杂TiO2的可见光催化活性比照纯 TiO2有明显的改善.
이뇨소위담원、HF위조공제,채용수열법제비료이(001)활성면위주적담참잡형TiO2최화제.SEM、TEM 、XRD、Raman급UV‐Vis측시결과표명,TiO2급N‐TiO2산품균위폭로(001)면적납미편상예태광결구,TiO2재고온900℃단소잉능보지예태광결구.F-불부대(001)면적폭로기도흔호적조공작용,이차억제료TiO2재고온하향금홍석상적전화.담적참잡착화료TiO2적금대관도,사기변대홍이,재가견광구역유흔강적흡수봉.병차,수착담참잡량적증다,N‐TiO2재가견광적흡수봉증강.이가견광강해염료라단명B용액작위탐침반응,연구료불동N/Ti배비적N‐TiO2적가견광최화활성,담참잡TiO2적가견광최화활성비조순 TiO2유명현적개선.
N‐doped titanium dioxide nanosheets were successfully prepared using urea as the nitrogen source by a facile one‐step hydrothermal method with the assistance of hydrofluoric acid .Using the photodecomposition of rhodamine B as a probe ,we study the photocatalytic activity of different N/Ti mass ratio under visible light irradiation .The results show that the obtained undoped TiO 2 and N‐doped TiO2 nanosheets had the anatase phase and exhibited good thermal stability .It is believed that fluorine plays the roles on both stabilization on the (001) facets as a morphology controlling agent and enhancement in the crystallization of anatase phase of TiO 2 .The bands of the N‐doped TiO2 ma‐terials have a quite redshift ,a stronger absorption in the visible light region .In the photodegradation of rhodamine B in the visible light irradiation ,photocatalytic activities of nitrogen‐doped titania are greatly improved compared with the undoped TiO 2 .