Effect of silica/titania ratio on enhanced photooxidation of industrial hazardous materials by microwave treated mesoporous SBA-15/TiO2 nanocomposites

• Published in: Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2016-07, Vol.18 (7), p.1, Article 209
• Main Authors: Mehta, Akansha, Mishra, Amit, Sharma, Manisha, Singh, Satnam, Basu, Soumen
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Hazardous materials; Inorganic Chemistry; Irradiation; Lasers; Materials Science; Nanoparticles; Nanotechnology; Optical Devices; Optics; Pentachlorophenol; Photodegradation; Photonics; Photooxidation; Physical Chemistry; Research Paper; Silica; Titanium dioxide; Ultraviolet radiation
• ISSN: 1388-0764; 1572-896X
• DOI: 10.1007/s11051-016-3523-x

In this study microwave assisted technique has been adopted for the synthesis of different weight ratios of TiO 2 dispersed on Santa barbara amorphous-15 (SBA-15) support. Morphological study revealed TiO 2 particles (4–10 nm) uniformly distributed on SBA-15 while increases in SBA-15 content results in higher specific surface area (524–237 m 2 /g). The diffraction intensity of 101 plane of anatase polymorph was seen increasing with increase in TiO 2 ratio. All the photocatalysts were having a mesoporous nature and follow the Langmuir IV isotherm, SBA-15 posses the highest pore volume (0.93 cm 3  g −1 ) which consistently decreased with TiO 2 content and was lowest (0.50 cm 3  g −1 ) in case of 5 wt% of TiO 2 followed by P25 (0.45 cm 3  g −1 ) while pore diameter increased after TiO 2 incorporation due to pore strain. The photocatalytic activity of the nanocomposites were analysed for the photodegradation of alizarin dye and pentachlorophenol under UV light irradiation. The reaction kinetics suggested the highest efficiency (98 % for alizarin and 94 % for PCP) of 5 wt% TiO 2 compared to other photocatalysts, these nanocomposites were reused for several cycles, which is most important for heterogeneous photocatalytic degradation reaction. Graphical abstract This study demonstrates the synthesis of silica embedded TiO 2 nanocomposites by microwave assisted technique and their catalytic influence on degradation of organic dyes and pollutants. Higher loading of titania (SBA-15/TiO 2 , 1:5) results better catalytic performance than commercial nano TiO 2 (P25).