A facile band alignment with sharp edge morphology accelerating the charge transportation for visible light photocatalytic degradation: A multiplex synergy
2019
Abstract Heterojunction photocatalysts has gained much attention in last decade due to their high photo-catalytic activity. Therefore, we have synthesized Ag-AgBr/TiO2-g-C3N4, a visible light photo-catalyst via. single step micro-emulsification followed by controlled hydrothermal and calcination treatment. Simultaneous crystallization of TiO2 and conversion of bulk g-C3N4 into nano-sheets took place by hydrothermal and calcination respectively. The degradation efficiency of Ag-AgBr/TiO2-g-C3N4 for MB and RhB was quite high with rate constant k = 0.120 & 0.156 min−1 than TiO2-g-C3N4 (k = 0.035 & 0.053 min−1) and Ag-AgBr/TiO2 (k = 0.015 & 0.016 min−1) respectively. This phenomenon was explained in terms of multiplex synergy such as localized surface plasmon resonance (LSPR) of AgNPs and absorption of visible light by AgBr, further the interfacial electron transferring within Ag-AgBr-TiO2 and g-C3N4 has equal contribution apart. The suitable adjustment of band edge potential ensures the enhance separation of electron-hole pairs providing an excellent photocatalytic activity. Moreover Ag-AgBr/TiO2-g-C3N4 exhibited good photo stability and reusability due to plasmonic properties of AgNPs.
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