SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (10): 2535-2543.DOI: 10.1016/j.cjche.2019.01.036

• Energy, Resources and Environmental Technology • Previous Articles     Next Articles

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

Qin Zhou, Hengbo Yin, Aili Wang, Yang Si   

  1. Faculty of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
  • Received:2018-11-12 Revised:2019-01-17 Online:2020-01-17 Published:2019-10-28
  • Contact: Hengbo Yin
  • Supported by:
    Supported by the National Natural Science Foundation of China (21506078).

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

Qin Zhou, Hengbo Yin, Aili Wang, Yang Si   

  1. Faculty of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
  • 通讯作者: Hengbo Yin
  • 基金资助:
    Supported by the National Natural Science Foundation of China (21506078).

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