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Pankaj,
- Intensification of the Chemical Degradation of Reactive Red 141 in the Presence of Ultrasound and Rare Earths [Lanthanum and Praseodymium]
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Authors
Pankaj
1,
Shikha Goyal
1
Affiliations
1 Department of Chemistry, Dayalbagh Educational Institute, Agra-282005, IN
1 Department of Chemistry, Dayalbagh Educational Institute, Agra-282005, IN
Source
Journal of Pure and Applied Ultrasonics, Vol 34, No 4 (2012), Pagination: 76-81Abstract
Degradation of an azo dye, Reactive Red 141 (C52H26C12N14Na8O26S8) in the aqueous solution has been carried out with ultrasound (US) and in combination with rare earth ions (La3+ and Pr3+). Both horn and tank type of sonicating devices, operating at 20 kHz and 250 W, were used for the degradation. A comparative study of continuous and pulsed mode of ultrasound induction has also been undertaken. Operational parameter, such as, initial dye concentration, pH and the presence of rare earth ions on the degradation of dye have been found to affect the degradation process . The degradation rate increased with increasing rare earth concentration, decreasing pH and initial dye concentration. The kinetic data fitted well with pseudo-first order kinetic model. The rate constant for the degradation process with US+RE was three times compared to US alone. The efficiency of various processes for the degradation of RR 141 dye was found to be in the order: US+La>US+Pr>US.Keywords
Degradation, Ultrasound, RR 141, Rare Earth Ions, Kinetics.- Role of Ceric Ion (Ce4+) in the Sonosorption of Acid Red 114, Reactive Blue 21 and Basic Violet 16 Dyes on TiO2
Abstract Views :178 |
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Authors
Affiliations
1 Department of Chemistry, Dayalbagh Educational Institute, Agra-282005, U.P., IN
1 Department of Chemistry, Dayalbagh Educational Institute, Agra-282005, U.P., IN
Source
Journal of Pure and Applied Ultrasonics, Vol 35, No 4 (2013), Pagination: 129-132Abstract
Adsorption study of three textile dyes[Acid Red 114 (AR 114), Reactive Blue 21 (RB 21) and Basic Violet 16 (BV 16)] of different classes has been carried out on TiO2 alone and in combination with rare earth ion [Ce4+], in the aqueous solutions, in the presence and absence of ultrasound. The complete removal of AR 114 and RB 21 were achieved in 5 minutes of sonication in the presence of rare earths while BV 16 was decolourised to only 21% even after 50 min. The experimental data was analysed using different adsorption isotherms, kinetics and adsorption mechanism. The isotherm data fitted very well with Langmuir model and the adsorption followed pseudo-second order kinetics. The presence of Ce4+ ions enhanced adsorption of anionic dyes on TiO2 surface but decreased for basic dye. A mechanism of adsorption and the degradation of dyes have been proposed.Keywords
Adsorption, Ultrasound, AR 114, RB 21, BV 16, TiO2, Rare Earth.- Sono-Photo-Catalytic Behaviour of Cerium in the Degradation of Potassium Iodide
Abstract Views :125 |
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Authors
Affiliations
1 Department of Chemistry, Dayalbagh Educational Institute, Agra-282005, IN
1 Department of Chemistry, Dayalbagh Educational Institute, Agra-282005, IN