A novel screen-printed TiO2 photoelectrochemical sensor for direct determination and reduction of hexavalent chromium

A novel and simple photoelectrochemical (PEC) sensor to detect Cr(VI) based on screen-printed TiO2 modified with gold nanoparticles is presented. The proposed PEC sensor showed a very low detection limit (S/N = 3) of 0.004 mu M, over a wide linear concentration range from 0.01 mu M to 100 mu M with a high sensitivity of 11.88 mu A.mu M-1 Cr(VI). Results also indicated good anti-interference and superb recovery in natural media application for Cr(VI) sensing. (C) 2015 Elsevier B.V. All rights reserved.