87.
Bismuth oxyhalides (BiOX (X = Cl, Br, I) are considered to be an important p-type semiconductors in the photocatalysis applications. In particular, tetragonal BiOBr is considered as a stable photocatalyst due to its resilient absorption in the visible region with an band gap energy of 2.8 eV. In the meantime, lanthanide ions (with 3+ oxidation state) implies as conversion catalyst gained huge impact and remain a serious topic in materials chemistry. Here we synthesized upconversion photocatalyst mainly consists of BiOBr with the Er
3+ and Tb
3+ ions along with low band gap g-C
3N
5 for the improved photocatalytic performances. The synthesized Er
3+/Tb
3+@BiOBr-g-C
3N
5 heterojunction was systematically characterized by XRD, and FT-IR for the confirmation of the composite and their morphology were analysed with FESEM and HR-TEM analysis which revealed that the sheets of g-C
3N
5 were decorated by Er
3+/Tb
3+ loaded BiOBr microspheres. The XPS analysis confirmed the suitable oxidation state of all the individual elements existing in the composite. As the UV-DRS analysis showed that the band gap of the Er
3+/Tb
3+ BiOBr-gC
3N
5 heterojunction was narrowed to 2.64 eV. To evaluate the photocatalytic efficiency of the synthesized g-C
3N
5, Er
3+/Tb
3+@BiOBr and Er
3+/Tb
3+@BiOBr-gC
3N
5 heterojunction under the simulated visible light irradiation source towards the aqueous sulfamethoxazole degradation. The Er
3+/Tb
3+@BiOBr-gC
3N
5 heterojunction shows maximum degradation efficiency of 94.2% after 60 min of visible light irradiation whereas the pure g-C
3N
5 provided about 43.8% and Er
3+/Tb
3+@BiOBr implies 55.2% degradation efficiency. The plausible degradation mechanism of pollutant removal was proposed.
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