TY - JOUR
T1 - Two-dimensional Ga2S3/g-C3N4 heterojunction composites with highly enhanced photocatalytic activity and stability
AU - Chen, Chih Yen
AU - Tseng, Chia Chieh
N1 - Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer Nature Switzerland AG.
PY - 2023/2
Y1 - 2023/2
N2 - In contrast to most composite nanostructured catalysts, two-dimensional Ga2S3 semiconductors and ultrathin graphitic-related materials, g-C3N4 heterojunction photocatalysts, are highly efficient photocatalysts for the removal of methylene blue from aqueous solutions because of their extraordinarily stable absorption and physical and optoelectrical properties. The activities of Ga2S3 nanosheet catalysts are 40% higher than those of commercial P25-TiO2 catalysts. In comparison with the performances of Ga2S3 and g-C3N4 photocatalysts, light absorption by the Ga2S3/g-C3N4 heterostructures in the visible region was at least 2.53 and 2.97 times higher, and their photocatalytic efficiencies increased by more than 2.23 and 2.96 times, respectively. The efficient separation and prolonged lifetimes of photogenerated charge carriers enhanced the photocatalytic activity for degradation. In addition, the parameters of the synthesis process for finely uniform, promising Ga2S3/g-C3N4 heterostructured nanomaterials were investigated; such parameters included the precursor amount (Ga, S, and melamine), annealing temperature, and reaction time, and their effects on the structural properties and photocatalytic performance were studied. The detailed mechanism of the photocatalytic system was evaluated through a free radical scavenging experiment, electron paramagnetic resonance spectroscopy, and time-resolved fluorescence spectroscopy. Pseudo-first-order kinetics models were used to describe the efficient photocatalysis of methylene blue photodegradation by the Ga2S3/g-C3N4 heterostructures over different reaction times. e−, •OH, and •O2– radicals were confirmed as the major reactive oxidative species, and the degradation products were determined. This study is beneficial because it will promote future research on the use of renewable, sustainable resources in photocatalytic applications. Graphical Abstract: [Figure not available: see fulltext.]
AB - In contrast to most composite nanostructured catalysts, two-dimensional Ga2S3 semiconductors and ultrathin graphitic-related materials, g-C3N4 heterojunction photocatalysts, are highly efficient photocatalysts for the removal of methylene blue from aqueous solutions because of their extraordinarily stable absorption and physical and optoelectrical properties. The activities of Ga2S3 nanosheet catalysts are 40% higher than those of commercial P25-TiO2 catalysts. In comparison with the performances of Ga2S3 and g-C3N4 photocatalysts, light absorption by the Ga2S3/g-C3N4 heterostructures in the visible region was at least 2.53 and 2.97 times higher, and their photocatalytic efficiencies increased by more than 2.23 and 2.96 times, respectively. The efficient separation and prolonged lifetimes of photogenerated charge carriers enhanced the photocatalytic activity for degradation. In addition, the parameters of the synthesis process for finely uniform, promising Ga2S3/g-C3N4 heterostructured nanomaterials were investigated; such parameters included the precursor amount (Ga, S, and melamine), annealing temperature, and reaction time, and their effects on the structural properties and photocatalytic performance were studied. The detailed mechanism of the photocatalytic system was evaluated through a free radical scavenging experiment, electron paramagnetic resonance spectroscopy, and time-resolved fluorescence spectroscopy. Pseudo-first-order kinetics models were used to describe the efficient photocatalysis of methylene blue photodegradation by the Ga2S3/g-C3N4 heterostructures over different reaction times. e−, •OH, and •O2– radicals were confirmed as the major reactive oxidative species, and the degradation products were determined. This study is beneficial because it will promote future research on the use of renewable, sustainable resources in photocatalytic applications. Graphical Abstract: [Figure not available: see fulltext.]
KW - g-CN
KW - GaS
KW - Heterojunction
KW - Nanomaterials
KW - Photocatalyst
KW - Photodegradation
UR - http://www.scopus.com/inward/record.url?scp=85144632067&partnerID=8YFLogxK
U2 - 10.1007/s42114-022-00606-z
DO - 10.1007/s42114-022-00606-z
M3 - Article
AN - SCOPUS:85144632067
SN - 2522-0128
VL - 6
JO - Advanced Composites and Hybrid Materials
JF - Advanced Composites and Hybrid Materials
IS - 1
M1 - 20
ER -
