Polymer-coating of photocatalytic particles to prevent sintering in their calcination process

Hikaru Namigata; Kanako Watanabe; Saya Okubo; Daisuke Nagao

doi:10.1016/j.colsurfa.2020.124782

Polymer-coating of photocatalytic particles to prevent sintering in their calcination process

Hikaru Namigata, Kanako Watanabe, Saya Okubo, Daisuke Nagao

ENG - Chemical Engineering

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

A method to prevent sintering of photocatalytic particles in a calcination process is developed to allow their crystallization without a significant decrease in their specific surface area. A sacrificial layer of polymer to prevent the particle from sintering was employed for the crystallization of amorphous titania particles in the heat treatment at 500 °C. The heat treatment simultaneously removed the polymer layer by pyrolysis. The heat treatment using a sacrificial layer of polymer could suppress a decrease in the specific surface area of titania particles and also maintain colloidal stability in water, attaining a photocatalytic activity higher than that without using a sacrificial layer. These results indicate that the polymer-coating technique is effective for crystallization of photocatalytic particles without a loss of both colloidal stability and photocatalytic activity of the particles.

Original language	English
Article number	124782
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	599
DOIs	https://doi.org/10.1016/j.colsurfa.2020.124782
Publication status	Published - 2020 Aug 20

Keywords

Aggregation
Colloidal stability
Photocatalyst
Polymer coating
Sintering
Titanium dioxide

ASJC Scopus subject areas

Surfaces and Interfaces
Physical and Theoretical Chemistry
Colloid and Surface Chemistry

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title = "Polymer-coating of photocatalytic particles to prevent sintering in their calcination process",

abstract = "A method to prevent sintering of photocatalytic particles in a calcination process is developed to allow their crystallization without a significant decrease in their specific surface area. A sacrificial layer of polymer to prevent the particle from sintering was employed for the crystallization of amorphous titania particles in the heat treatment at 500 °C. The heat treatment simultaneously removed the polymer layer by pyrolysis. The heat treatment using a sacrificial layer of polymer could suppress a decrease in the specific surface area of titania particles and also maintain colloidal stability in water, attaining a photocatalytic activity higher than that without using a sacrificial layer. These results indicate that the polymer-coating technique is effective for crystallization of photocatalytic particles without a loss of both colloidal stability and photocatalytic activity of the particles.",

keywords = "Aggregation, Colloidal stability, Photocatalyst, Polymer coating, Sintering, Titanium dioxide",

author = "Hikaru Namigata and Kanako Watanabe and Saya Okubo and Daisuke Nagao",

note = "Funding Information: The authors thank technical support staff in the department of Engineering for the measurements, Tohoku University for STEM images. This research was mainly supported by the Ministry of Education, Culture, Sports, Science and Technology (Materials Processing Science project ({"}Materealize{"}) of MEXT, Grant Number JPMXP0219192801 and JSPS KAKENHI Grant Numbers 17K19020 , 17H02744 , 16J0337 5, 15KK0222 ). Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

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doi = "10.1016/j.colsurfa.2020.124782",

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AU - Namigata, Hikaru

AU - Watanabe, Kanako

AU - Okubo, Saya

AU - Nagao, Daisuke

N1 - Funding Information: The authors thank technical support staff in the department of Engineering for the measurements, Tohoku University for STEM images. This research was mainly supported by the Ministry of Education, Culture, Sports, Science and Technology (Materials Processing Science project ("Materealize") of MEXT, Grant Number JPMXP0219192801 and JSPS KAKENHI Grant Numbers 17K19020 , 17H02744 , 16J0337 5, 15KK0222 ). Publisher Copyright: © 2020 Elsevier B.V.

PY - 2020/8/20

Y1 - 2020/8/20

N2 - A method to prevent sintering of photocatalytic particles in a calcination process is developed to allow their crystallization without a significant decrease in their specific surface area. A sacrificial layer of polymer to prevent the particle from sintering was employed for the crystallization of amorphous titania particles in the heat treatment at 500 °C. The heat treatment simultaneously removed the polymer layer by pyrolysis. The heat treatment using a sacrificial layer of polymer could suppress a decrease in the specific surface area of titania particles and also maintain colloidal stability in water, attaining a photocatalytic activity higher than that without using a sacrificial layer. These results indicate that the polymer-coating technique is effective for crystallization of photocatalytic particles without a loss of both colloidal stability and photocatalytic activity of the particles.

AB - A method to prevent sintering of photocatalytic particles in a calcination process is developed to allow their crystallization without a significant decrease in their specific surface area. A sacrificial layer of polymer to prevent the particle from sintering was employed for the crystallization of amorphous titania particles in the heat treatment at 500 °C. The heat treatment simultaneously removed the polymer layer by pyrolysis. The heat treatment using a sacrificial layer of polymer could suppress a decrease in the specific surface area of titania particles and also maintain colloidal stability in water, attaining a photocatalytic activity higher than that without using a sacrificial layer. These results indicate that the polymer-coating technique is effective for crystallization of photocatalytic particles without a loss of both colloidal stability and photocatalytic activity of the particles.

KW - Aggregation

KW - Colloidal stability

KW - Photocatalyst

KW - Polymer coating

KW - Sintering

KW - Titanium dioxide

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ER -

Polymer-coating of photocatalytic particles to prevent sintering in their calcination process

Abstract

Keywords

ASJC Scopus subject areas

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