| A process for purifying aqueous solutions containing heavy and toxic metals such as chromium has been investigated. One of the extremely harmful pollutant in rivers and sea water are the heavy metal ions due to their direct impact on human, animals and plants are hexavalent chromium Cr(VI). Consequently, highly sensitive sensor to detect Chromium is essential. Surface Plasmon resonance (SPR) technique has attracted huge research interest in detecting heavy metals specifically. In this study, three types of prism-based SPR sensor; gold (Au)/silver (Ag), Au/polyaniline (PANI) and Au/ titanium dioxide (TiO2) nanostructured films are investigated as potential sensing material to detect the presence of Cr (VI) ions in water. The base Au layer with thickness of 48.3 nm is deposited on a glass slide for all sensors. For Au/Ag, Au/PANI nanofibers and Au/ (TiO2) sensor films, the Cr (VI) concentration is varied from 1 to 15 ppm with sensitivity of 0.270 ? ppm-1, 0.082? ppm-1and 0.039 ? ppm-1 respectively. Based on these results, the Au/ PANI nanofibers are the most sensitive to chromium Cr(VI) among tested sensing materials. |
