CoFe₂O₄/TiO₂ nanocatalysts for the photocatalytic degradation of Reactive Red 120 in aqueous solutions in the presence and absence of electron acceptors

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• 作者：Panneerselvam Sathishkumar^a ; ^b ; Ramalinga Viswanathan Mangalaraja^b ; Sambandam Anandan^a ; ^{sanand99@yahoo.com} ; ^{sanand@nitt.edu} ; Muthupandian Ashokkumar^c
• 关键词：CoFe2O4/TiO2 nanocatalyst ; Reactive Red 120 ; Photocatalytic degradation ; Electron acceptors
• 刊名：Chemical Engineering Journal
• 出版年：2013
• 出版时间：15 March, 2013
• 年：2013
• 卷：220
• 期：Complete
• 页码：302-310
• 全文大小：1536 K

文摘

Magnetic CoFe₂O₄ and CoFe₂O₄/TiO₂ nanocatalysts were prepared by a co-precipitation method in which CoFe₂O₄ induced the formation of thermodynamically more stable rutile phase of TiO₂. The structural and elemental analyses confirmed the formation of CoFe₂O₄ and CoFe₂O₄/TiO₂ nanocatalysts and the specific atomic ratios of Ti, Co, Fe, and O in these catalysts. The presence of Co²⁺ and Fe³⁺ cations in its oxide forms on the surface of TiO₂ led to visible light absorption in the wavelength range 550-650 nm. The band gap calculated by Tauc approach showed ¡«3.2, 1.1 and 2.8 eV for TiO₂, CoFe₂O₄ and CoFe₂O₄/TiO₂ nanocatalysts, respectively. The photocatalytic degradation of Reactive Red 120 (RR120) was studied by varying its concentration and the amount of nanocatalyst in order to attain a maximum degradation. The role of electron acceptors in the photocatalytic degradation of RR120 was studied in the presence of the magnetic nanocatalysts.