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首页> 外文期刊>Journal of Crystal Growth >Anatase crystal growth and photocatalytic characteristics of hot water-treated polyethylene oxide-titania nanohybrids
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Anatase crystal growth and photocatalytic characteristics of hot water-treated polyethylene oxide-titania nanohybrids

机译：热水处理的聚环氧乙烷-二氧化钛纳米杂化物的锐钛矿晶体生长和光催化特性

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摘要

Hybrid polyethylene oxide (PEO)-TiO_2 and pure TiO_2 powders were synthesized using a sol-gel route and hot water treated at 90℃. Anatase phase formation characteristics were investigated and compared for each powder using X-ray diffraction (XRD). Hybrid powder showed enhanced anatase formation kinetics and thus high crystallinity with anatase phase compared to pure TiO_2. Enhanced kinetics and crystallinity of hybrids was discussed based upon the increased surface area coming from dissolution of PEO during hot water treatment, which in turn induced formation and rearrangement of increased number of free Ti-OH bonds. By condensation reaction of Ti-OH bonds resultant Ti-O-Ti bonds would readily form and grow into anastase crystals. Hybrid powder showed well-developed anatase crystals leading to much enhanced photocatalytic properties compared to pure TiO_2 powder.
机译：采用溶胶-凝胶法和90℃热水处理，合成了杂化聚环氧乙烷（PEO）-TiO_2和纯TiO_2粉末。研究了锐钛矿相的形成特性，并使用X射线衍射（XRD）对每种粉末进行了比较。与纯TiO_2相比，杂化粉末显示出增强的锐钛矿形成动力学，因此具有锐钛矿相的高结晶度。基于在热水处理过程中PEO溶解引起的表面积增加，讨论了杂化反应动力学和结晶度的提高，这反过来又导致了形成的Ti-OH键数目的增加和重新排列。通过Ti-OH键的缩合反应，所得的Ti-O-Ti键将容易形成并长成阿斯塔斯晶体。与纯TiO_2粉末相比，杂化粉末显示出发达的锐钛矿晶体，从而大大提高了光催化性能。

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