Electrochromic titania nanotube arrays for the enhanced photocatalytic degradation of phenol and pharmaceutical compounds

Qing Zheng; Hye Jin Lee; Jaesang Lee; Wonyong Choi; Noh Back Park; Changha Lee

doi:10.1016/j.cej.2014.03.111

Electrochromic titania nanotube arrays for the enhanced photocatalytic degradation of phenol and pharmaceutical compounds

Qing Zheng, Hye Jin Lee, Jaesang Lee, Wonyong Choi, Noh Back Park, Changha Lee

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

63 Citations (Scopus)

Abstract

Vertically aligned, electrochromic-coloured, amorphous titania nanotube arrays (TNAs) were fabricated using a facile room-temperature, solution-based electrochemical cathodisation method. Rapid cathodisation within 30s converted pristine TNAs into their dark analogues. Compared to their untreated counterparts, the cathodised dark TNAs exhibited significantly enhanced optical absorbance, covering the full spectrum of visible light. Further annealing of the electrochromic coloured amorphous TNAs in a N₂ atmosphere induced their transformation into dark crystalline TNAs, which directly harnessed simulated sunlight for the photocatalytic degradation of organic contaminants, including phenol, ibuprofen, carbamazepine and caffeine. Compared to the pristine crystalline TNAs (annealed in air), the dark crystalline TNAs showed higher optical absorbance, larger charge carrier density, lower electron transport resistance, and an enhancement of 107-131% in degradation kinetics for the target organic contaminants.

Original language	English
Pages (from-to)	285-292
Number of pages	8
Journal	Chemical Engineering Journal
Volume	249
DOIs	https://doi.org/10.1016/j.cej.2014.03.111
Publication status	Published - 2014 Aug 1

Bibliographical note

Funding Information:
This work was supported by National Research Foundation of Korea (NRF) grants funded by the Korea government (MEST) ( 2012R1A2A2A01006581, 2013062394 ) and by the Korean Ministry of Environment as “The Converging Technology Project (2012000600002)”. This work was also financially supported by the KIST-UNIST partnership program (2.130404.01).

Keywords

Cathodisation
Electrochromism
Pharmaceutical compounds
Phenol
Photocatalysis
Titania nanotube arrays

ASJC Scopus subject areas

General Chemistry
Environmental Chemistry
General Chemical Engineering
Industrial and Manufacturing Engineering

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10.1016/j.cej.2014.03.111

Cite this

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title = "Electrochromic titania nanotube arrays for the enhanced photocatalytic degradation of phenol and pharmaceutical compounds",

abstract = "Vertically aligned, electrochromic-coloured, amorphous titania nanotube arrays (TNAs) were fabricated using a facile room-temperature, solution-based electrochemical cathodisation method. Rapid cathodisation within 30s converted pristine TNAs into their dark analogues. Compared to their untreated counterparts, the cathodised dark TNAs exhibited significantly enhanced optical absorbance, covering the full spectrum of visible light. Further annealing of the electrochromic coloured amorphous TNAs in a N2 atmosphere induced their transformation into dark crystalline TNAs, which directly harnessed simulated sunlight for the photocatalytic degradation of organic contaminants, including phenol, ibuprofen, carbamazepine and caffeine. Compared to the pristine crystalline TNAs (annealed in air), the dark crystalline TNAs showed higher optical absorbance, larger charge carrier density, lower electron transport resistance, and an enhancement of 107-131% in degradation kinetics for the target organic contaminants.",

keywords = "Cathodisation, Electrochromism, Pharmaceutical compounds, Phenol, Photocatalysis, Titania nanotube arrays",

author = "Qing Zheng and Lee, {Hye Jin} and Jaesang Lee and Wonyong Choi and Park, {Noh Back} and Changha Lee",

note = "Funding Information: This work was supported by National Research Foundation of Korea (NRF) grants funded by the Korea government (MEST) ( 2012R1A2A2A01006581, 2013062394 ) and by the Korean Ministry of Environment as “The Converging Technology Project (2012000600002)”. This work was also financially supported by the KIST-UNIST partnership program (2.130404.01). ",

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AU - Choi, Wonyong

AU - Park, Noh Back

AU - Lee, Changha

N1 - Funding Information: This work was supported by National Research Foundation of Korea (NRF) grants funded by the Korea government (MEST) ( 2012R1A2A2A01006581, 2013062394 ) and by the Korean Ministry of Environment as “The Converging Technology Project (2012000600002)”. This work was also financially supported by the KIST-UNIST partnership program (2.130404.01).

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Y1 - 2014/8/1

N2 - Vertically aligned, electrochromic-coloured, amorphous titania nanotube arrays (TNAs) were fabricated using a facile room-temperature, solution-based electrochemical cathodisation method. Rapid cathodisation within 30s converted pristine TNAs into their dark analogues. Compared to their untreated counterparts, the cathodised dark TNAs exhibited significantly enhanced optical absorbance, covering the full spectrum of visible light. Further annealing of the electrochromic coloured amorphous TNAs in a N2 atmosphere induced their transformation into dark crystalline TNAs, which directly harnessed simulated sunlight for the photocatalytic degradation of organic contaminants, including phenol, ibuprofen, carbamazepine and caffeine. Compared to the pristine crystalline TNAs (annealed in air), the dark crystalline TNAs showed higher optical absorbance, larger charge carrier density, lower electron transport resistance, and an enhancement of 107-131% in degradation kinetics for the target organic contaminants.

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Electrochromic titania nanotube arrays for the enhanced photocatalytic degradation of phenol and pharmaceutical compounds

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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