TY - JOUR
T1 - New insights into the efficient charge transfer of ternary chalcogenides composites of TiO2
AU - Ganguly, Priyanka
AU - R., Syam Kumar
AU - Muscetta, Marica
AU - Padmanabhan, Nisha T.
AU - Clarizia, Laura
AU - Akande, A.
AU - Hinder, Steven
AU - Mathew, Snehamol
AU - John, Honey
AU - Breen, Ailish
AU - Pillai, Suresh C.
N1 - Funding Information:
PG and SK would like to acknowledge the Institute of Technology Sligo President's Bursaryfor providing financial support (grant no: PPRES052 andPPRES050respectively). Computational resources have been provided by the supercomputer facilities at the Trinity Centre for High Performance Computing (TCHPC) under the project code: HPC_16_00953 and Irish Centre for High-End Computing (ICHEC) under the project codes: is-phy002c and is-phy003c. PG would like to acknowledge Dr. Manu Jose for the JCPDS files. SCP and SM would like to thank the European Union's INTERREG VA Programme for the Renewable Engine (RE) project, managed by the Special EU Programmes Body (SEUPB), with match funding provided by the Department for the Economy and Department of Jobs, Enterprise and Innovation in Ireland
Funding Information:
PG and SK would like to acknowledge the Institute of Technology Sligo President’s Bursary for providing financial support (grant no: PPRES052 and PPRES050 respectively). Computational resources have been provided by the supercomputer facilities at the Trinity Centre for High Performance Computing (TCHPC) under the project code: HPC_16_00953 and Irish Centre for High-End Computing (ICHEC) under the project codes: is-phy002c and is-phy003c. PG would like to acknowledge Dr. Manu Jose for the JCPDS files. SCP and SM would like to thank the European Union’s INTERREG VA Programme for the Renewable Engine (RE) project, managed by the Special EU Programmes Body (SEUPB), with match funding provided by the Department for the Economy and Department of Jobs, Enterprise and Innovation in Ireland
Publisher Copyright:
© 2020 The Author(s)
PY - 2021/3
Y1 - 2021/3
N2 - A two-step solvothermal synthesis was adopted to prepare AgXSe2-TiO2 (X = In, Bi) composites. DFT study of the pristine parent samples showed the formation of the hexagonal phase of AgBiSe2, and tetragonal phase of AgInSe2 and TiO2, which corroborated the experimentally synthesised structures. Both the AgBiSe2-TiO2 and AgInSe2-TiO2 composites displayed enhanced visible light absorption and reduced band gap in the UV-DRS patterns. The XPS results exhibited a shift in binding energy values and the TEM results showed the formation of spherical nanoparticles of both AgBiSe2 and AgInSe2. The PL signals displayed delayed recombination of the photogenerated excitons. The as synthesised materials were studied for their photocatalytic efficiency, by hydrogen generation, degradation of doxycycline, and antimicrobial disinfection (E. coli and S. aureus). The composite samples illustrated more than 95 % degradation results within 180 min and showed 5 log reductions of bacterial strains within 30 min of light irradiation. The hydrogen production outcomes were significantly improved as the AgBiSe2 and AgInSe2 based composites illustrated 180-fold and 250-fold enhanced output compared to their parent samples. The enhanced photocatalytic efficiency displayed is attributed to the delayed charge recombination of the photogenerated electron-hole pairs in the AgXSe2-TiO2 interface. Formation of a p-n nano heterojunction for AgBiSe2-TiO2 and type II heterojunction for AgInSe2-TiO2 composite are explained.
AB - A two-step solvothermal synthesis was adopted to prepare AgXSe2-TiO2 (X = In, Bi) composites. DFT study of the pristine parent samples showed the formation of the hexagonal phase of AgBiSe2, and tetragonal phase of AgInSe2 and TiO2, which corroborated the experimentally synthesised structures. Both the AgBiSe2-TiO2 and AgInSe2-TiO2 composites displayed enhanced visible light absorption and reduced band gap in the UV-DRS patterns. The XPS results exhibited a shift in binding energy values and the TEM results showed the formation of spherical nanoparticles of both AgBiSe2 and AgInSe2. The PL signals displayed delayed recombination of the photogenerated excitons. The as synthesised materials were studied for their photocatalytic efficiency, by hydrogen generation, degradation of doxycycline, and antimicrobial disinfection (E. coli and S. aureus). The composite samples illustrated more than 95 % degradation results within 180 min and showed 5 log reductions of bacterial strains within 30 min of light irradiation. The hydrogen production outcomes were significantly improved as the AgBiSe2 and AgInSe2 based composites illustrated 180-fold and 250-fold enhanced output compared to their parent samples. The enhanced photocatalytic efficiency displayed is attributed to the delayed charge recombination of the photogenerated electron-hole pairs in the AgXSe2-TiO2 interface. Formation of a p-n nano heterojunction for AgBiSe2-TiO2 and type II heterojunction for AgInSe2-TiO2 composite are explained.
KW - Antibiotics degradation
KW - Antimicrobial inactivation
KW - Band edge alignment
KW - Computational study
KW - Photocatalysis
KW - Water splitting
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U2 - 10.1016/j.apcatb.2020.119612
DO - 10.1016/j.apcatb.2020.119612
M3 - Article
AN - SCOPUS:85092512356
SN - 0926-3373
VL - 282
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 119612
ER -
