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Type:	Artigo de Periódico
Title:	Solvent effect on the structure and photocatalytic behavior of TiO2-RGO nanocomposites
Authors:	Bruno de Souza Gonçalves Manuel Noel Paul Georges Houmard Eduardo Henrique Martins Nunes Lucas Márlon Castro Silva Tarcizo da Cruz Costa de Souza Vinícius Gomes de Castro Glaura Goulart Silva Bruno Cordeiro Silva Klaus Wilhelm Heinrich Krambrock Renata Braga Soares Vanessa de Freitas Cunha Lins
Abstract:	There is no agreement regarding which solvent is more suitable to obtain sol–gel–derived titania (TiO2) samples with an enhanced photocatalytic behavior. Furthermore, the solvent effect on the preparation of TiO2-RGO (reduced graphene oxide) nanocomposites has not been published yet and could be an attractive experimental strategy to modulate structure and properties. On the basis of these observations, TiO2-RGO nanocomposites were fabricated in this study. It was evaluated for the influence of using either isopropyl (IsoprOH) or ethyl (EtOH) alcohol on the textural and photocatalytic properties of the prepared materials. The use of IsoprOH led to samples with smaller crystallite size, narrower apparent band gap, smaller isoelectric point, larger adsorption capacity, and higher photocatalytic activity. In addition, the incorporation of RGO into TiO2 greatly improved the adsorption capacity and photocatalytic activity of the latter. However, the optimal loading of RGO to prepare composites with enhanced photocatalytic activities was 1 wt%. This finding can be related to the stacking of RGO sheets when concentrations above 1 wt% are used, which could prevent UV light to reach the TiO2 particles and also decrease the photocatalytic capacity of the composites. Moreover, materials with RGO concentration above 1 wt% could exhibit a highly negatively charged surface, which may decrease the separation of the generated electron–hole pairs and lead to faster recombination rates of charge carriers.
Subject:	Óxido de grafeno Nanocompósitos
language:	eng
metadata.dc.publisher.country:	Brasil
Publisher:	Universidade Federal de Minas Gerais
Publisher Initials:	UFMG
metadata.dc.publisher.department:	ENG - DEPARTAMENTO DE ENGENHARIA METALÚRGICA ENG - DEPARTAMENTO DE ENGENHARIA QUÍMICA ICX - DEPARTAMENTO DE FÍSICA ICX - DEPARTAMENTO DE QUÍMICA
Rights:	Acesso Restrito
metadata.dc.identifier.doi:	https://doi.org/10.1557/jmr.2019.342
URI:	http://hdl.handle.net/1843/46993
Issue Date:	2019
metadata.dc.url.externa:	https://link.springer.com/article/10.1557/jmr.2019.342#citeas
metadata.dc.relation.ispartof:	Journal of Materials Research
Appears in Collections:	Artigo de Periódico

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