1School of Chemistry, Shoolini University of Biotechnology and Management Sciences, Solan -173212, Himachal Pradesh, India
2School of Physics, Shoolini University of Biotechnology and Management Sciences, Solan -173212, Himachal Pradesh, India
Adv. Mater. Lett., 2017, 8 (3), pp 229-238
DOI: 10.5185/amlett.2017.1467
Publication Date (Web): Jan 28, 2017
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E-mail: pardeepchem@gmail.com
The supported photocatalysis is emerging as an effective technology to overcome of inherent drawbacks of bare magnetic photocatalysts. Herein, ZnFe2O4 was immobilized over graphene sand composite (GSC) and bentonite (BT) to report ZnFe2O4/GSC and ZnFe2O4/BT photocatalyst. The size of ZnFe2O4/GSC and ZnFe2O4/BT was obtained as 100 and 50 nm, respectively. Both photocatalysts exhibited band gap of 1.95 eV. ZnFe2O4/GSC and ZnFe2O4/BT had BET surface area of 15.6 and 14.5 cm2, respectively. The appearance of D and G band in Raman spectra indicated the formation of graphene sand composites. The superparamagnetic property of photocatalyst resulted in quick separation photocatalyst form reaction solution. The adsorption and photocatalytic capability of ZnFe2O4/GSC and ZnFe2O4/BT was evaluated for photo-mineralization of ampicillin and oxytetracycline antibiotics. The adsorption process showed significant effect on mineralization of selected antibiotics. Simultaneous adsorption and degradation (A+P) process was highly effective for antibiotic degradation. More than 90% of antibiotic mineralization was obtained in 10 hours. The power law model authorized the complex nature of degradation process. Magnetically recoverable photocatalyst exhibited significant recycling efficiency due to easier recovery of photocatalysts.
Superparamagnetic ZnFe2O4, supported-photocatalysis, antibiotic mineralization, kinetics.
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