Abstract
The real-time monitoring of lead ion interaction on gold/chitosan surface has been explored using surface plasmon resonance spectroscopy to study the kinetics of lead ion adsorption. The gold/chitosan surface has been prepared by spin coating of 0.55 ml chitosan solution at 6,000 rev/min for 30 s on a thin gold film. The shift of resonance angle has been found to increase exponentially with time for all the concentration of lead ion in the range of 0.5–100 ppm; and reach to a saturation value. At low concentration (5 ppm and below), the kinetic reaction was complete and reached to saturation value in about 2 min, while a more complex kinetic profile has been observed and complete at approximately 8 min for higher concentration (more than 5 ppm). The saturation value for the shift of resonance angle is directly proportional to the lead ion concentration. The sensitivity of lead ion detection for this SPR-gold/chitosan is as 0.00483 and 0.00675 ppm−1, for 0–100 ppm and 0–10 ppm, respectively.
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Acknowledgments
The authors would like to thank the Malaysian Government for the fund support through SAGA and FRGS (No. 5523901) research grants. The laboratory facilities provided by the Department of Physics, Faculty of Science, Universiti Putra Malaysia, are also acknowledged.
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Fen, Y.W., Yunus, W.M.M. & Talib, Z.A. Real-time monitoring of lead ion interaction on gold/chitosan surface using surface plasmon resonance spectroscopy. Indian J Phys 86, 619–623 (2012). https://doi.org/10.1007/s12648-012-0082-6
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DOI: https://doi.org/10.1007/s12648-012-0082-6