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Electro-assisted ammonium persulfate activation to promote the introduction of N and S into TiO2 film: Enhancing its photoelectrocatalytic performance under solar

Published online by Cambridge University Press:  20 September 2019

Changxin Li ,
Yan Liu ,
Yanzong Zhang ,
Lulu Long ,
Fei Shen ,
Gang Yang ,
Xiaohong Zhang ,
Yan He ,
Lilin Wang  and
Shihuai Deng
Changxin Li
Affiliation:
College of Environment, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
Yan Liu
Affiliation:
College of Environment, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
Yanzong Zhang*
Affiliation:
College of Environment, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
Lulu Long
Affiliation:
College of Environment, Sichuan Agricultural University, Chengdu, Sichuan 611130, China; and Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
Fei Shen
Affiliation:
College of Environment, Sichuan Agricultural University, Chengdu, Sichuan 611130, China; and Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
Gang Yang
Affiliation:
College of Environment, Sichuan Agricultural University, Chengdu, Sichuan 611130, China; and Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
Xiaohong Zhang
Affiliation:
College of Environment, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
Yan He
Affiliation:
College of Environment, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
Lilin Wang
Affiliation:
College of Environment, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
Shihuai Deng
Affiliation:
College of Environment, Sichuan Agricultural University, Chengdu, Sichuan 611130, China; and Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Anatase phase NOx/S6+–TiO2 (x= 0, 1) film with high solar-driven activity has been successfully prepared via electro-assisted oxidation processes. The morphological and structural properties of the film were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction, while the optical property was detected by UV-vis-NIR absorption spectroscopy. The results showed that the NOx/S6+–TiO2 film was composed of “flower-like” microvoids structure and displayed broad and strong optical absorption at around 544 and 1500 nm. Transient photocurrent response, photoluminescence spectroscopy, and electrochemical impedance spectroscopy indicated that the generation and separation of photogenerated charges were significantly enhanced under simulated solar irradiation. The NOx/S6+–TiO2 film exhibited excellent photoelectrocatalytic activity for the degradation of methyl orange (MO), and the decoloration rate and TOC removal respectively reached 98.97 and 59.44% at 20 min under solar irradiation. The film still had good stability after reusing ten times. Furthermore, a possible mechanism of photoelectrocatalysis was suggested in MO degradation by using NOx/S6+–TiO2 film.

Keywords

electro-oxidationanatase TiO2narrow gapphotoelectrocatalyticmechanism
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 20 , 28 October 2019 , pp. 3573 - 3582
Copyright
Copyright © Materials Research Society 2019 

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