One-Pot Synthesis of Regular Rhombic Titanium Dioxide Supracolloidal Submicrometer Sheet via Sol-Gel Method
One-Pot Synthesis of Regular Rhombic Titanium Dioxide Supracolloidal Submicrometer Sheet via Sol-Gel Method
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DOI：
10.1021/la403284c
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发表时间：
2014-01-14
期刊：
影响因子：
3.9
通讯作者：
Qiu, Dong
中科院分区：
文献类型：
--
作者：
Huang, Ting;Qiu, Dong
采用溶胶-凝胶法在无模板剂的情况下制备了具有规则菱形形貌的亚微米级无定形二氧化钛(a-SMS)。这些a-SMS由原始纳米颗粒组成，它们以紧密堆积的方式排列在平面上。一次纳米粒子的二维定向自组装被认为是形成这种规则的a-SMS的机制。这是首次在无定形二氧化钛中观察到这种规则的自组装，这可能导致胶体粒子自组装的新场景。在500℃焙烧后，α-SMS仍保持规则的形状，但转化为锐钛矿亚微米薄片(c-SMS)，对罗丹明B的光降解活性高于商品P25。此外，由于其较大的尺寸，在2000rpm下使用后，近90%的c-SMS很容易被回收，而在类似条件下几乎没有P25被回收。
A sot-gel method was developed to prepare amorphous titanium dioxide (TiO2) submicrometer sheets (a-SMSs) with regular rhombic morphology without templates. These a-SMSs comprised of primary nanoparticles, which were organized in a close packing mode in a plane. Two-dimensional (2-D) directional self-assembly of primary nanoparticles was proposed as the mechanism of forming such regular a-SMSs. It was the first time to observe such regular SMSs in amorphous TiO2, which may lead to a new scenario for colloidal particle self-assembly. After calcination at 500 degrees C, the regular shape of a-SMSs was still maintained, while the a-SMSs turned into anatase submicrometer sheets (c-SMSs), which exhibited higher activity than commercial P25 in photodegradation of rhodamine B. Furthermore, due to their larger sizes, nearly 90% of c-SMSs were readily recovered after use by centrifugation at 2000 rpm, while hardly any P25 was recovered under a similar condition.