A. O. Revenko, D. A. Kozlov, I. V. Kolesnik, A. S. Poluboiarinov, S. Yu. Kottsov and A. V. Garshev
{"title":"Amorphous titania as a precursor to brookite-based materials obtained via hydrothermal treatment†","authors":"A. O. Revenko, D. A. Kozlov, I. V. Kolesnik, A. S. Poluboiarinov, S. Yu. Kottsov and A. V. Garshev","doi":"10.1039/D4CE00606B","DOIUrl":null,"url":null,"abstract":"<p >Amorphous phases commonly accompany materials obtained through a number of methods, which often significantly change the functional properties of the materials. Thus, when present in photocatalysts, they decrease the photocatalytic performance of the materials significantly. To minimize the amorphous content in photocatalysts and increase their photocatalytic properties, hydrothermal post-treatment of amorphous photocatalysts is suggested. In this work, a series of brookite-based titania materials were obtained <em>via</em> the post-treatment of amorphous titania under hydrothermal conditions to determine how synthesis parameters affect the properties of the obtained TiO<small><sub>2</sub></small> materials. The samples were characterized <em>via</em> X-ray diffraction analysis, scanning and transmission electron microscopy, and low-temperature nitrogen adsorption analysis. Special attention was given to the amount of residual amorphous phases in the samples. Results indicated the possibility of selectively crystallizing titania materials with high brookite contents and enhanced photocatalytic properties from amorphous titania without significantly altering the form of the particles. This study presents the amorphous phase as a valuable precursor to obtain highly crystalline materials with vast control of phase composition.</p>","PeriodicalId":70,"journal":{"name":"CrystEngComm","volume":null,"pages":null},"PeriodicalIF":2.6000,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"CrystEngComm","FirstCategoryId":"92","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2024/ce/d4ce00606b","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Amorphous phases commonly accompany materials obtained through a number of methods, which often significantly change the functional properties of the materials. Thus, when present in photocatalysts, they decrease the photocatalytic performance of the materials significantly. To minimize the amorphous content in photocatalysts and increase their photocatalytic properties, hydrothermal post-treatment of amorphous photocatalysts is suggested. In this work, a series of brookite-based titania materials were obtained via the post-treatment of amorphous titania under hydrothermal conditions to determine how synthesis parameters affect the properties of the obtained TiO2 materials. The samples were characterized via X-ray diffraction analysis, scanning and transmission electron microscopy, and low-temperature nitrogen adsorption analysis. Special attention was given to the amount of residual amorphous phases in the samples. Results indicated the possibility of selectively crystallizing titania materials with high brookite contents and enhanced photocatalytic properties from amorphous titania without significantly altering the form of the particles. This study presents the amorphous phase as a valuable precursor to obtain highly crystalline materials with vast control of phase composition.
无定形相通常伴随着通过多种方法获得的材料,这些无定形相通常会显著改变材料的功能特性。因此,当非晶相存在于光催化剂中时,会大大降低材料的光催化性能。为了尽量减少光催化剂中的非晶体含量,提高其光催化性能,建议对非晶体光催化剂进行水热后处理。在这项工作中,通过在水热条件下对无定形二氧化钛进行后处理,获得了一系列基于褐铁矿的二氧化钛材料,以确定合成参数如何影响所获得的二氧化钛材料的性能。通过 X 射线衍射分析、扫描和透射电子显微镜以及低温氮吸附分析对样品进行了表征。研究人员特别关注了样品中无定形相的残留量。研究结果表明,可以在不明显改变颗粒形态的情况下,从无定形二氧化钛中选择性地结晶出具有高褐铁矿含量和增强光催化性能的二氧化钛材料。这项研究将无定形相作为一种有价值的前驱体,通过对相组成的大量控制来获得高结晶性材料。