Combination of sonochemical and freeze-drying methods for synthesis of graphene/Ag-doped TiO2 nanocomposite: A strategy to boost the photocatalytic performance via well distribution of nanoparticles between graphene sheets

Preparation of visible-light active photocatalysts for efficient degradation of pollutants from the industrial wastewater has received considerable attention in recent decades. The present study introduces a new sonochemical route for the preparation of graphene/TiO2/Ag nanocomposite for visible-lig...

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Main Authors: Ashraf, Muhammad Aqeel, Liu, Zhenling, Peng, Wan-Xi, Jermsittiparsert, Kittisak, Hosseinzadeh, Ghader, Hosseinzadeh, Raza
Format: Article
Published: Elsevier 2020
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Online Access:http://eprints.um.edu.my/36754/
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spelling my.um.eprints.367542024-11-06T00:49:40Z http://eprints.um.edu.my/36754/ Combination of sonochemical and freeze-drying methods for synthesis of graphene/Ag-doped TiO2 nanocomposite: A strategy to boost the photocatalytic performance via well distribution of nanoparticles between graphene sheets Ashraf, Muhammad Aqeel Liu, Zhenling Peng, Wan-Xi Jermsittiparsert, Kittisak Hosseinzadeh, Ghader Hosseinzadeh, Raza TA Engineering (General). Civil engineering (General) Preparation of visible-light active photocatalysts for efficient degradation of pollutants from the industrial wastewater has received considerable attention in recent decades. The present study introduces a new sonochemical route for the preparation of graphene/TiO2/Ag nanocomposite for visible-light photocatalytic degradation of X6G (C.I. Reactive Yellow 2), a commonly used textile azo-dye. The obtained graphene/TiO2/Ag nanocomposite is extracted from the reaction solution by two drying methods: (1) conventional centrifuging and drying, and (2) freeze drying. Both of the dried samples are calcinated at 500 degrees C. The TEM images reveal that distribution of TiO2/Ag nanoparticles within the graphene sheets in the freeze dried nanocomposite is better than the conventional dried sample. Furthermore, the freeze dried nanocomposite has higher photocatalytic activity than the other nanocomposite. In conventional centrifuging and drying method, some of the TiO2/Ag nanoparticles are gradually pushed out from the graphene sheets during the drying process and graphene layers are stacked, therefore the dispersion effect of sonication is destroyed. However, in the freeze dried nanocomposite, because of the fast freezing of the sonicated sample by liquid N-2, the TiO2/Ag nanoparticles are kept between the graphene sheets and calcination process attached and fixed them to the graphene, preserving the dispersion effect of sonication. Elsevier 2020-04 Article PeerReviewed Ashraf, Muhammad Aqeel and Liu, Zhenling and Peng, Wan-Xi and Jermsittiparsert, Kittisak and Hosseinzadeh, Ghader and Hosseinzadeh, Raza (2020) Combination of sonochemical and freeze-drying methods for synthesis of graphene/Ag-doped TiO2 nanocomposite: A strategy to boost the photocatalytic performance via well distribution of nanoparticles between graphene sheets. Ceramics International, 46 (6). pp. 7446-7452. ISSN 0272-8842, DOI https://doi.org/10.1016/j.ceramint.2019.11.241 <https://doi.org/10.1016/j.ceramint.2019.11.241>. 10.1016/j.ceramint.2019.11.241
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Ashraf, Muhammad Aqeel
Liu, Zhenling
Peng, Wan-Xi
Jermsittiparsert, Kittisak
Hosseinzadeh, Ghader
Hosseinzadeh, Raza
Combination of sonochemical and freeze-drying methods for synthesis of graphene/Ag-doped TiO2 nanocomposite: A strategy to boost the photocatalytic performance via well distribution of nanoparticles between graphene sheets
description Preparation of visible-light active photocatalysts for efficient degradation of pollutants from the industrial wastewater has received considerable attention in recent decades. The present study introduces a new sonochemical route for the preparation of graphene/TiO2/Ag nanocomposite for visible-light photocatalytic degradation of X6G (C.I. Reactive Yellow 2), a commonly used textile azo-dye. The obtained graphene/TiO2/Ag nanocomposite is extracted from the reaction solution by two drying methods: (1) conventional centrifuging and drying, and (2) freeze drying. Both of the dried samples are calcinated at 500 degrees C. The TEM images reveal that distribution of TiO2/Ag nanoparticles within the graphene sheets in the freeze dried nanocomposite is better than the conventional dried sample. Furthermore, the freeze dried nanocomposite has higher photocatalytic activity than the other nanocomposite. In conventional centrifuging and drying method, some of the TiO2/Ag nanoparticles are gradually pushed out from the graphene sheets during the drying process and graphene layers are stacked, therefore the dispersion effect of sonication is destroyed. However, in the freeze dried nanocomposite, because of the fast freezing of the sonicated sample by liquid N-2, the TiO2/Ag nanoparticles are kept between the graphene sheets and calcination process attached and fixed them to the graphene, preserving the dispersion effect of sonication.
format Article
author Ashraf, Muhammad Aqeel
Liu, Zhenling
Peng, Wan-Xi
Jermsittiparsert, Kittisak
Hosseinzadeh, Ghader
Hosseinzadeh, Raza
author_facet Ashraf, Muhammad Aqeel
Liu, Zhenling
Peng, Wan-Xi
Jermsittiparsert, Kittisak
Hosseinzadeh, Ghader
Hosseinzadeh, Raza
author_sort Ashraf, Muhammad Aqeel
title Combination of sonochemical and freeze-drying methods for synthesis of graphene/Ag-doped TiO2 nanocomposite: A strategy to boost the photocatalytic performance via well distribution of nanoparticles between graphene sheets
title_short Combination of sonochemical and freeze-drying methods for synthesis of graphene/Ag-doped TiO2 nanocomposite: A strategy to boost the photocatalytic performance via well distribution of nanoparticles between graphene sheets
title_full Combination of sonochemical and freeze-drying methods for synthesis of graphene/Ag-doped TiO2 nanocomposite: A strategy to boost the photocatalytic performance via well distribution of nanoparticles between graphene sheets
title_fullStr Combination of sonochemical and freeze-drying methods for synthesis of graphene/Ag-doped TiO2 nanocomposite: A strategy to boost the photocatalytic performance via well distribution of nanoparticles between graphene sheets
title_full_unstemmed Combination of sonochemical and freeze-drying methods for synthesis of graphene/Ag-doped TiO2 nanocomposite: A strategy to boost the photocatalytic performance via well distribution of nanoparticles between graphene sheets
title_sort combination of sonochemical and freeze-drying methods for synthesis of graphene/ag-doped tio2 nanocomposite: a strategy to boost the photocatalytic performance via well distribution of nanoparticles between graphene sheets
publisher Elsevier
publishDate 2020
url http://eprints.um.edu.my/36754/
_version_ 1814933264132997120
score 13.214268