物理化学学报
物理化學學報
물이화학학보
ACTA PHYSICO-CHIMICA SINICA
2013年
1期
167-175
,共9页
陈拂晓%范伟强%周腾云%黄卫红
陳拂曉%範偉彊%週騰雲%黃衛紅
진불효%범위강%주등운%황위홍
α-Fe2O3%TiO2%核-壳纳米小球%分级多孔结构%光催化性质%亚甲基蓝
α-Fe2O3%TiO2%覈-殼納米小毬%分級多孔結構%光催化性質%亞甲基藍
α-Fe2O3%TiO2%핵-각납미소구%분급다공결구%광최화성질%아갑기람
α-Fe2O3%TiO2%Core-shel nanosphere%Hierarchical porous structure%Photocatalytic property%Methylene blue
通过溶剂热和溶胶-凝胶涂层法,设计并制备了具有分级多孔结构和光催化性质的核-壳纳米球(HP-Fe2O3@TiO2).透射电子显微镜(TEM)照片证明所得HP-Fe2O3@TiO2样品具备分级多孔结构,这是因为HP-Fe2O3@TiO2的内核(Fe2O3)具有大孔空隙,同时外壳(TiO2)具有介孔空隙.此外,通过X射线衍射(XRD)、扫描电子显微镜(SEM)、高分辨透射电子显微镜(HRTEM)、X射线光电子能谱(XPS)以及氮气吸附-脱附曲线深入研究了HP-Fe2O3@TiO2的结构及其性质.分别在可见及紫外光照下,研究了样品在H2O2体系下的光催化降解亚甲基蓝(MB)的性质.所观察到的HP-Fe2O3@TiO2纳米球的光催化性能,可归因于核-壳结构的协同作用,这进一步表明, TiO2外壳对α-Fe2O3的光催化活性有重要影响作用.在可见光照射下, HP-Fe2O3@TiO2(1 mL Ti(OC4H9)4(TBT))具有较优异的光催化活性.同时, HP-Fe2O3@TiO2(4 mL TBT)具备优异的单分散形貌,并在紫外光照射下,表现出最优的光催化活性.
通過溶劑熱和溶膠-凝膠塗層法,設計併製備瞭具有分級多孔結構和光催化性質的覈-殼納米毬(HP-Fe2O3@TiO2).透射電子顯微鏡(TEM)照片證明所得HP-Fe2O3@TiO2樣品具備分級多孔結構,這是因為HP-Fe2O3@TiO2的內覈(Fe2O3)具有大孔空隙,同時外殼(TiO2)具有介孔空隙.此外,通過X射線衍射(XRD)、掃描電子顯微鏡(SEM)、高分辨透射電子顯微鏡(HRTEM)、X射線光電子能譜(XPS)以及氮氣吸附-脫附麯線深入研究瞭HP-Fe2O3@TiO2的結構及其性質.分彆在可見及紫外光照下,研究瞭樣品在H2O2體繫下的光催化降解亞甲基藍(MB)的性質.所觀察到的HP-Fe2O3@TiO2納米毬的光催化性能,可歸因于覈-殼結構的協同作用,這進一步錶明, TiO2外殼對α-Fe2O3的光催化活性有重要影響作用.在可見光照射下, HP-Fe2O3@TiO2(1 mL Ti(OC4H9)4(TBT))具有較優異的光催化活性.同時, HP-Fe2O3@TiO2(4 mL TBT)具備優異的單分散形貌,併在紫外光照射下,錶現齣最優的光催化活性.
통과용제열화용효-응효도층법,설계병제비료구유분급다공결구화광최화성질적핵-각납미구(HP-Fe2O3@TiO2).투사전자현미경(TEM)조편증명소득HP-Fe2O3@TiO2양품구비분급다공결구,저시인위HP-Fe2O3@TiO2적내핵(Fe2O3)구유대공공극,동시외각(TiO2)구유개공공극.차외,통과X사선연사(XRD)、소묘전자현미경(SEM)、고분변투사전자현미경(HRTEM)、X사선광전자능보(XPS)이급담기흡부-탈부곡선심입연구료HP-Fe2O3@TiO2적결구급기성질.분별재가견급자외광조하,연구료양품재H2O2체계하적광최화강해아갑기람(MB)적성질.소관찰도적HP-Fe2O3@TiO2납미구적광최화성능,가귀인우핵-각결구적협동작용,저진일보표명, TiO2외각대α-Fe2O3적광최화활성유중요영향작용.재가견광조사하, HP-Fe2O3@TiO2(1 mL Ti(OC4H9)4(TBT))구유교우이적광최화활성.동시, HP-Fe2O3@TiO2(4 mL TBT)구비우이적단분산형모,병재자외광조사하,표현출최우적광최화활성.
Core-shel photocatalysts of hierarchical porous nanospheres (HP-Fe2O3@TiO2) have been designed and prepared using solvothermal and sol-gel methods. Transmission electron microscopy (TEM) images confirm that the obtained samples have a hierarchical porous structure, which results from both the macroporous structure of the core (Fe2O3) and the mesoporous structure of the shel (TiO2). X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption-desorption isotherms were employed to characterize the structure and properties of HP-Fe2O3@TiO2 nanospheres. We investigated the photocatalytic degradation (in the presence of H2O2) of methylene blue (MB) irradiated under visible and ultraviolet light. The observed photocatalytic performance of HP-Fe2O3@TiO2 nanospheres is attributed to the synergetic effects of the core-shel structure, which indicates that the TiO2 shel enhances the photocatalytic performance of α-Fe2O3. HP-Fe2O3@TiO2 (1 mL Ti(OC4H9)4 (TBT)) possesses the highest photodegradation reaction constant among al samples under visible light irradiation. Moreover, HP-Fe2O3@TiO2 (4 mL TBT) has an optimal monodisperse morphology and achieves high photocatalytic activity under ultraviolet light irradiation.
