Low-temperature synthesis and investigations on photocatalytic activity of nanoparticles BiFeO3 for methylene blue and methylene orange degradation and some toxic organic compounds. (4th October 2016)

• Record Type: Journal Article
• Authors: Dao, Ngoc Nhiem; Luu, Minh Dai; Pham, Ngoc Chuc; Doan, Trung Dung; Nguyen, Thi Ha Chi; Nguyen, Quang Bac; Duong, Thi Lim
• Is Part Of: Advances in natural sciences. Volume 7:Number 4(2016)
• Publication Date: 2016-10-04
• Subjects: BiFeO3 nanoparticle -- combustion method -- toxic organic compound degradation -- methylene blue -- methylene orange; 4.02 -- 5.07; Nanotechnology -- Periodicals; Nanoscience -- Periodicals; 620.5
• DOI: 10.1088/2043-6262/7/4/045003
• Languages: English
• ISSNs: 2043-6254

Abstract

Abstract: The photocatalytic BiFeO3 perovskite nanoparticles were fabricated by gel combustion method using polyvinyl alcohol and corresponding metal nitrate precursors under the optimum mild conditions such as pH 2, gel formation temperature of 80 °C, metal/polyvinyl alcohol molar ratio of 1/3, metal molar ratio Bi/Fe of 1/1 and calcination temperature at 500 °C for 2 h. The prepared sample was characterized by x-ray diffraction, field scanning electron microscopy, transmission electron microscopy, Brunauer–Emmetl–Teller nitrogen adsorption method at 77 K, energy dispersive x-ray spectroscopy, ultraviolet-visible light spectrophotometry, and thermal analysis. The effects of molar ratios of starting material and calcination temperature on phase formation and morphology were investigated. The degradation of methylene blue, methylene orange and some toxic organic compounds such as phenol and diazinon under visible light irradiation by photocatalytic BiFeO3 nanoparticles were evaluated at different parameters and conditions such as the light intensity determined from the light source to the measured sample, the addition H2 O2, reaction time and the regeneration performance. Obtained results showed that the synthesized perovskite BiFeO3 nanoparticles for the optimized sample have a size smaller than 50 nm and the high mean surface area of 50 m 2 g −1 . Degradation efficiency was almost 90.0% for methylene blue and 80.0% for methylene orange with added H2 O2 after 30 min of reaction. After the 3rd time of regeneration, the BiFeO3 nanoparticles still have 92.8% of the degradation performance for removing methylene blue. Phenol and diazinon toxic compound were degraded with the performance of 92.42% and 85.7%, respectively, for 150 min