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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Nanoparticle Route for the Preparation in Aqueous Medium of Mesoporous TiO2 with Controlled Porosity and Crystalline Framework
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Nanoparticle Route for the Preparation in Aqueous Medium of Mesoporous TiO2 with Controlled Porosity and Crystalline Framework

机译：孔隙度和晶体骨架可控的介孔TiO2水溶液中纳米制备方法

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摘要

Mesoporous TiO2 with tunable pore size and mono-, bi-, and tricrystalline frameworks was prepared from titania nanoparticles synthesized by a sol-gel method. The synthesis was performed by using an amphiphilic triblock copolymer, Pluronic F127, as a structure-directing agent and titanium isopropoxide as a precursor. The structure-directing agent was added in a presynthesized colloidal suspension composed of bicrystalline titania nanoparticles dispersed in an aqueous medium. By varying the ratio between the number of efhoxy units and the number of titanium atoms (EO/Ti), mesoporous TiO2 materials with controlled pore size were synthesized. Materials were characterized by TG/DTA, XRD, SEM, TEM, and N2 adsorption-desorption analysis. In the absence of copolymer, the porosity was low, indicating efficiently packed TiO2 nanoparticles. As the EO/Ti ratio was increased, the average pore size and the specific surface area became larger, whereas the crystallite size of anatase and brookite became smaller. The addition of copolymer induced the enrichment of the brookite polymorph, prevented particle growth, and delayed the formation of rutile. Bimodal (mesoporous-macroporous) N-doped titania with a pure anatase framework was obtained by using diethanolamine (DEA) as the source of nitrogen.
机译：用溶胶-凝胶法合成的二氧化钛纳米粒子制备了具有可调孔径，单晶，双晶和三晶骨架的介孔TiO2。合成是通过使用两亲三嵌段共聚物Pluronic F127作为结构导向剂和异丙醇钛作为前体进行的。将结构导向剂添加到由分散在水性介质中的双晶二氧化钛纳米颗粒组成的预合成胶体悬浮液中。通过改变乙氧基单元数与钛原子数（EO / Ti）的比值，合成了孔径可控的介孔TiO2材料。通过TG / DTA，XRD，SEM，TEM和N2吸附-脱附分析对材料进行表征。在没有共聚物的情况下，孔隙率低，表明有效填充了TiO2纳米颗粒。随着EO / Ti比的增加，平均孔径和比表面积变大，而锐钛矿和板钛矿的微晶尺寸变小。共聚物的加入引起板钛矿多晶型物的富集，阻止了颗粒的生长，并延迟了金红石的形成。通过使用二乙醇胺（DEA）作为氮源，获得具有纯锐钛矿型骨架的双峰（中孔-大孔）N掺杂二氧化钛。

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