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Reduction of hexavalent chromium by polypyrrole-modified steel mesh electrode |
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| Institution: | 1. Department of Applied Chemistry, University of Johannesburg, Doornfontein, Johannesburg 2028, South Africa;2. DST/CSIR National Center for Nanostructured Materials, Council for Scientific and Industrial Research (CSIR), Pretoria 0001, South Africa;1. Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, South Africa;2. Department of Civil and Chemical Engineering, University of South Africa (UNISA), South Africa;3. Department of Chemical Engineering, Vaal University of Technology, Vanderbiljpark, South Africa |
| Abstract: | Adherent polypyrrole (ppy) films were electropolymerized from a para-toluenesulfonic sodium (PTS) solution on stainless steel mesh (SSM). Reduced ppy-modified SSM electrode can transfer Cr(VI) to Cr(III) effectively. Lower pH (<2) or higher temperature (>35 °C) is beneficial for the removal of Cr(VI). Electro-reduction achieved 90% removal efficiency after 21 min by cyclic voltammetry. The removal efficiency is 96–56% for one–six contact cycles between ppy and Cr(VI). SEM shows that ppy films on SSM have regular morphology with small nucleus of less than 1 μm in diameter. |
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