Optical and photocatalytic behaviours of nanoparticles in the Ti-Zn-O binary system
Optical and photocatalytic behaviours of nanoparticles in the Ti-Zn-O binary system
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DOI：
10.1039/c3ra48030e
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发表时间：
2014-01-01
期刊：
影响因子：
3.9
通讯作者：
Darr, Jawwad A.
中科院分区：
文献类型：
--
作者：
Goodall, Josephine B. M.;Kellici, Suela;Darr, Jawwad A.
连续水热流合成 (CHFS) 已被用作一种快速、清洁的合成方法，在 Ti-Zn-O 二元系统中生产一系列晶体纳米颗粒。使用过热水（400℃和24.1MPa）作为试剂和结晶介质的CHFS反应器，分别由双（乳酸铵）二氢氧化钛（IV）水溶液和水合硝酸锌制备纳米粉末。将所得纳米粉末在空气中在850℃下热处理五小时以得到金红石和氧化锌和/或钛酸锌的光活性半导体混合物。使用粉末X射线同步加速器衍射、透射电子显微镜、BET表面积测量、X射线光电子能谱和紫外-可见分光光度法对所制备的粉末及其相应的热处理混合相光催化剂进行了表征。由于人们对这些材料在 UVA 和 UVB 衰减材料中的兴趣，对纳米复合材料和固溶体的紫外-可见光剖面进行了研究。还评估了样品对亚甲基蓝染料脱色的光催化活性。
Continuous hydrothermal flow synthesis (CHFS) has been used as a rapid and clean, synthetic method to produce a range of crystalline nanoparticles in the Ti-Zn-O binary system. The nanopowders were prepared from aqueous solutions of titanium(IV) bis(ammonium lactato)dihydroxide (TIBALD) and hydrated zinc nitrate, respectively, using a CHFS reactor which uses superheated water (at 400 degrees C and 24.1 MPa) as a reagent and crystallizing medium. The resulting nanopowders were heat-treated at 850 degrees C for five hours in air to give photoactive semiconductor mixtures of rutile and zinc oxide and/or zinc titanates. The as-prepared powders and their corresponding heat-treated mixed phase photocatalysts were characterized using powder X-ray synchrotron diffraction, transmission electron microscopy, BET surface area measurement, X-ray photoelectron spectroscopy and UV-Vis spectrophotometry. Because of the interest for these materials in UVA and UVB attenuating materials, the UV-Vis profiles of the nanocomposites and solid solutions were studied. Photocatalytic activity of the samples towards the decolourisation of methylene blue dye was also assessed.