Citrate-capped gold nanoparticles as a sensing probe for determination of cetyltrimethylammonium surfactant using FTIR spectroscopy and colorimetry
A novel, facile, and low-cost method was developed for determination of cetyltrimethylammonium (CTA+) cationic surfactant in water samples using diffuse reflectance Fourier transform IR (FTIR) spectroscopy and colorimetry. Cetyltrimethylammonium bromide was chosen as a model compound to demonstrate the optimization of the method for determination of CTA+ in water samples. The absorption peak at 3015.96 cm-1 (for CTA+) was enhanced when gold nanoparticles were used as a chemical sensor in diffuse reflectance FTIR spectroscopy, and this absorption peak was used for determination of CTA+. Alternatively, the color change from wine red (525 nm) to blue (740 nm) and the redshift of the localized surface plasmon resonance band in the visible region were used as a sensing probe for determination of CTA+. A linear calibration curve for determination in water samples was obtained in the range from 10 to 100 ng mL-1 with a limit of detection of 3 ng mL-1 by diffuse reflectance FTIR spectroscopy and in the range from 20 to 400 ng mL-1 with a limit of detection of 7 ng mL-1 by colorimetry. The advantageous features of the methods are their simplicity, rapidity, and sensitivity for the determination of CTA+ in water samples.
KeywordsCetyltrimethylammonium cationic surfactant Gold nanoparticles Diffuse reflectance Fourier transform infrared spectroscopy and colorimetry Water samples
Financial assistance from the Department of Science and Technology Fund for Improvement of S&T Infrastructure in Universities & Higher Educational Institutions [no. SR/FST/CSI-259/2014(c)] is gratefully acknowledged. The authors are thankful to the University Grants Commission Special Assistance Programme [no. F-540/7/DRS-II/ 2016 (SAP-I)] for financial support. The authors are also thankful to the Science and Engineering Research Board (Department of Science and Technology), New Delhi, for financial assistance and providing instrumental facilities under the head SR/S1/IC-05/2012. The authors are also indebted to the Chhattisgarh Council of Science & Technology, Raipur (Endt. no. 2741/CCOST/MRP/2016) for financial support. RK gratefully acknowledges Pt. Ravishankar Shukla University for providing a university scholarship under the VR. no. 1413/Fin/2016.
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Conflict of interest
The authors declare that they have no competing interests.
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