Improved photocatalytic activity of TiO₂ produced by an alcohothermal approach through in-situ decomposition of NH₄HCO₃

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• 作者：Changyuan Hu^a ; ^b ; ^{hcy6257@163.com" class="auth_mail" title="E-mail the corresponding author} ; Chengjiang Lian^a ; ^c ; Shizheng Zheng^a ; ^b ; Xiaoyu Li^a ; ^b ; Tiewen Lu^a ; ^d ; Quanhong Hu^a ; ^b ; Shuwang Duo^a ; ^b ; Rongbin Zhang^d ; Yingying Sun^a ; ^b ; Fei Chen^a ; ^b
• 关键词：Titanium dioxide ; Solvothermal method ; NH4HCO3 ; Photocatalysis
• 刊名：Journal of Energy Chemistry
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：25
• 期：3
• 页码：489-494
• 全文大小：1439 K

文摘

High crystallinity of TiO₂ was prepared by a modified alcohothermal method, in which titanium isopropoxide was used as the titania precursor, absolute ethanol as the reaction medium, and NH₄HCO₃ as the raw materials for release of water, ammonia and carbon dioxides via in-situ decomposition. The X-ray powder diffraction (XRD) and transmission electron microscope (TEM) measurements showed that water and ammonia from the in-situ decomposition of NH₄HCO₃ played an important role in conducting the size, shape, crystallinity and microstructure of TiO₂. The photoluminescence spectroscopy and photocurrent measurements indicated that enhanced crystallinity could hinder the recombination and promote the separation of electron-hole pairs in TiO₂, which contribute to the improvement of photocatalytic activity. Methyl orange photodegradation under UV light confirmed that high crystallinity of TiO₂ did present a high photocatalytic activity due to the effective separation of photoinduced charges.