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- Title
Photocatalytic degradation of p -nitrotoluene (PNT) using TiO 2 -modified silver-exchanged NaY zeolite: kinetic study and identification of mineralization pathway.
- Authors
Surolia, Praveen K.; Jasra, Raksh V.
- Abstract
Nitroaromatic compounds are suspected hormone disrupter and considered as toxic priority pollutants. In the present study, different amounts of titanium dioxide impregnated zeolite Y (Si/Al ratio 5.5) was modified by silver metal ion exchange and its photocatalytic activity was studied for the mineralization ofp-nitrotoluene (PNT) in aqueous medium. The synthesized catalysts were characterized by XRD, SEM, inductively coupled plasma, diffuse reflectance spectroscopy, and N2adsorption techniques. The analysis of degradation intermediates and mineralization pathways were established using high performance liquid chromatography and mass spectroscopy. The mineralization of PNT into final products: CO2, H2O,, andwas assessed by chemical oxygen demand (COD) analysis. Langmuir–Hinshelwood kinetic model was proposed for the degradation and the reaction rate constant values were determined from the experimental data using the model. TiO2loading was optimized from the percentage degradation, rate constant, and mineralization values. COD study reveals up to ~60% mineralization in 240 min of irradiation to 75 mg L−1PNT with TiO2/AgY2 catalyst.
- Subjects
NITROTOLUENE; ZEOLITE Y; POLLUTANTS; CHEMICAL oxygen demand; HYDROTHERMAL deposits
- Publication
Desalination & Water Treatment, 2016, Vol 57, Issue 46, p22081
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2015.1125798