Synthesis of Hollow B-SiO2@CaTiO3 Nanocomposites and Their Photocatalytic Performance in Ammonia Nitrogen Degradation
2020
Lu, Xiaoqing | Zhou, Qin | Yin, Hengbo | Wang, Aili | Meng, Fanwen
Hollow B-SiO₂@CaTiO₃ nanocomposites were hydrothermally synthesized at a mild reaction temperature of 120 °C using calcium chloride and titanium (IV) isopropoxide as the starting materials and hollow B-SiO₂ microspheres as the supports. CaTiO₃ nanoparticles are anchored at the surfaces of hollow B-SiO₂ microspheres through the formation of Ti–O–B and Ti–O–Si bonds. The interaction between the CaTiO₃ nanoparticles and hollow B-SiO₂ microspheres enlarged the band gap of CaTiO₃ nanoparticles, giving a higher photocatalytic activity in ammonia nitrogen degradation at a lower catalyst loading and a wider range of ammonia nitrogen concentration. When the hollow B-SiO₂@CaTiO₃ (5wₜ%CaTiO₃) photocatalyst was hydrothermally synthesized at 120 °C for 12 h, and the photocatalytic degradation reaction of ammonia nitrogen (50 mg L⁻¹) in an aqueous solution was carried out under the simulated solar light irradiation at 25 °C for 4 h; the degradation extent of ammonium nitrogen reached 91%.
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