TY - JOUR
T1 - Heterostructured graphitic carbon nitride/titanium dioxide for enhanced photodegradation of low-concentration formaldehyde under visible light
AU - Liu, Shou Heng
AU - Lin, Wei Xing
N1 - Funding Information:
We are gratefully appreciated the support of this study by the Ministry of Science and Technology of Taiwan (grant number: MOST 105-2221-E-006-015-MY5 ).
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/6/1
Y1 - 2019/6/1
N2 - In this study, a variety of heterostructured TiO 2 decorating graphitic carbon nitride (denoted as GCN/TiO 2 -x) photocatalysts is synthesized by using a simple calcination method. Among the prepared GCN/TiO 2 -x, GCN/TiO 2 -3.0 composites possess the remarkably lower recombination rates of electron-hole pairs (evidenced by photoluminescence) and more visible-light absorption (evidenced by ultraviolet/visible diffuse reflectance spectroscopy) as compared to pure GCN and TiO 2 , respectively. Accordingly, the GCN/TiO 2 -3.0 photocatalysts show the enhanced performance toward degradation of low-concentration formaldehyde (HCHO) (rate constant = 0.0043 min −1 ) that is much better than GCN (rate constant = 0.0012 min −1 ) and TiO 2 (rate constant = 0.0007 min −1 ) in the presence of visible light. This improvement observed for the photocatalytic degradation of gas phase HCHO can be probably caused by the heterojunction between GCN (the enhanced absorption of visible light) and TiO 2 (improved separation of photogenerated electron-hole pairs). The electron spin resonance (ESR) signals suggest the photogenerated superoxide radical anions (·O 2 -) and hole (h + ) may be responsible for the visible-light-driven photodecomposition of HCHO. This work provides a facile route to prepare efficient photocatalysts for indoor air purification by using interior lighting.
AB - In this study, a variety of heterostructured TiO 2 decorating graphitic carbon nitride (denoted as GCN/TiO 2 -x) photocatalysts is synthesized by using a simple calcination method. Among the prepared GCN/TiO 2 -x, GCN/TiO 2 -3.0 composites possess the remarkably lower recombination rates of electron-hole pairs (evidenced by photoluminescence) and more visible-light absorption (evidenced by ultraviolet/visible diffuse reflectance spectroscopy) as compared to pure GCN and TiO 2 , respectively. Accordingly, the GCN/TiO 2 -3.0 photocatalysts show the enhanced performance toward degradation of low-concentration formaldehyde (HCHO) (rate constant = 0.0043 min −1 ) that is much better than GCN (rate constant = 0.0012 min −1 ) and TiO 2 (rate constant = 0.0007 min −1 ) in the presence of visible light. This improvement observed for the photocatalytic degradation of gas phase HCHO can be probably caused by the heterojunction between GCN (the enhanced absorption of visible light) and TiO 2 (improved separation of photogenerated electron-hole pairs). The electron spin resonance (ESR) signals suggest the photogenerated superoxide radical anions (·O 2 -) and hole (h + ) may be responsible for the visible-light-driven photodecomposition of HCHO. This work provides a facile route to prepare efficient photocatalysts for indoor air purification by using interior lighting.
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U2 - 10.1016/j.jphotochem.2019.04.025
DO - 10.1016/j.jphotochem.2019.04.025
M3 - Article
AN - SCOPUS:85064522316
SN - 1010-6030
VL - 378
SP - 66
EP - 73
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
ER -