Preparation of hollow B-SiO2@TiO2 composites and their photocatalytic performances for degradation of ammonia-nitrogen and green algae in aqueous solution

doi:10.1016/j.cjche.2019.01.036

Abstract

Abstract: Hollow B-SiO₂@TiO₂ composites were prepared by the wet chemical deposition method starting from TiCl₄ and hollow B-SiO₂ microspheres. TiO₂ layers composed of anatase TiO₂ nanoparticles were coated on the surfaces of the hollow B-SiO₂ microspheres probably through the formation of Ti-O-Si and Ti-O-B bonds. A great number of-OH groups were also present at the TiO₂ coating layers. The presence of Ti-O-Si bonds and Ti-O-B bonds resulted in the formation of defects in the TiO₂ coating layers, which decreased the band gap of the TiO₂ coating layers to ca. 3.0 eV and endowed the TiO₂ coating layers with visible light absorption performance. The buoyancy hollow B-SiO₂@TiO₂ composites exhibited high photocatalytic activities for the degradation of ammonia-nitrogen and green algae. The conversion of ammonia-nitrogen reached 65% when the degradation of ammonia-nitrogen (43 mg·L^-1 at pH value of 8) was catalyzed by the B-SiO₂@TiO₂(100:10) composite under the simulated solar light irradiation at 35℃ for 660 min. The green algae (5 mg·L^-1) were almost completely degraded over the B-SiO@TiO₂(100:20) photocatalyst under the visible light irradiation at 35℃ for 510 min.

Key words: B-SiO₂@TiO₂ composites, Photocatalysis, Ammonia-nitrogen, Green algae

摘要： Hollow B-SiO₂@TiO₂ composites were prepared by the wet chemical deposition method starting from TiCl₄ and hollow B-SiO₂ microspheres. TiO₂ layers composed of anatase TiO₂ nanoparticles were coated on the surfaces of the hollow B-SiO₂ microspheres probably through the formation of Ti-O-Si and Ti-O-B bonds. A great number of-OH groups were also present at the TiO₂ coating layers. The presence of Ti-O-Si bonds and Ti-O-B bonds resulted in the formation of defects in the TiO₂ coating layers, which decreased the band gap of the TiO₂ coating layers to ca. 3.0 eV and endowed the TiO₂ coating layers with visible light absorption performance. The buoyancy hollow B-SiO₂@TiO₂ composites exhibited high photocatalytic activities for the degradation of ammonia-nitrogen and green algae. The conversion of ammonia-nitrogen reached 65% when the degradation of ammonia-nitrogen (43 mg·L^-1 at pH value of 8) was catalyzed by the B-SiO₂@TiO₂(100:10) composite under the simulated solar light irradiation at 35℃ for 660 min. The green algae (5 mg·L^-1) were almost completely degraded over the B-SiO@TiO₂(100:20) photocatalyst under the visible light irradiation at 35℃ for 510 min.

关键词: B-SiO₂@TiO₂ composites, Photocatalysis, Ammonia-nitrogen, Green algae

Qin Zhou, Hengbo Yin, Aili Wang, Yang Si. Preparation of hollow B-SiO₂@TiO₂ composites and their photocatalytic performances for degradation of ammonia-nitrogen and green algae in aqueous solution[J]. Chinese Journal of Chemical Engineering, 2019, 27(10): 2535-2543.

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Preparation of hollow B-SiO₂@TiO₂ composites and their photocatalytic performances for degradation of ammonia-nitrogen and green algae in aqueous solution

Preparation of hollow B-SiO₂@TiO₂ composites and their photocatalytic performances for degradation of ammonia-nitrogen and green algae in aqueous solution

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