Tailoring of phase composition and photoresponsive properties of Ti-containing nanocomposites from layered precursor
Tailoring of phase composition and photoresponsive properties of Ti-containing nanocomposites from layered precursor
复制标题
层状前驱体含钛纳米复合材料的相组成和光响应性能的定制
DOI：
10.1021/jp711091m
复制
发表时间：
2008-03-20
影响因子：
3.7
通讯作者：
Wang, Yingxia
中科院分区：
文献类型：
--
作者：
Shu, Xin;He, Jing;Wang, Yingxia
以镍钛层状双氢氧化物为前驱体，通过煅烧合成了含钛纳米复合材料。通过X射线粉末衍射（PXRD）、高分辨透射电子显微镜（HRTEM）、BET法和紫外-可见漫反射光谱（DRS）对复合材料进行了表征。在热处理过程中观察到亚稳Ni 2 TiO 4尖晶石相向稳定NiTiO 3钛铁矿相的转变。在低于800 ℃的煅烧温度和800 ℃下的相转变属于颗粒内反应，而在900 ℃下发生相分离。UV-vis DRS表明纳米复合材料不仅具有响应性，而且在紫外光和可见光区域都具有活化性。以亚甲基蓝为降解对象，考察了它们的紫外可见光催化活性。结果表明，在紫外可见光照射下，含钛纳米复合材料具有良好的光催化活性。
Titanium-containing nanocomposites have been synthesized by calcination of a Ni-Ti layered double hydroxide as precursor. The nanocomposites were characterized by powder X-ray diffraction (PXRD), high-resolution transmission electron microscopy (HRTEM), the Brunauer-Emmett-Teller (BET) method, and UV-vis diffuse reflection spectroscopy (DRS). The transformation of the metastable Ni2TiO4 spinel phase to the stable NiTiO3 ilmenite phase was observed during the thermal process. The phase transformation at a calcination temperature below and at 800 degrees C belongs to the intraparticle reaction, while a phase separation occurs at 900 degrees C. UV-vis DRS indicates that the nanocomposites are not only responsive but also activated in both the UV- and visible-light regions. Their UV-vis-induced photocatalytic activities were evaluated by the degradation of methylene blue. The results show that the Ti-containing nanocomposites exhibit good photocatalytic activity under UV-vis-light irradiation.