Cetylpyridinium removal using phosphate-assisted electrocoagulation, electroreduction and adsorption on electrogenerated sorbents
Résumé
Cetylpyridinium (CP+) is a cationic surfactant that can be found in various effluents and known due its toxicity against aquatic organisms. The removal of this compound was investigated in water solutions by electrocoagulation, phosphate-assisted electrocoagulation and adsorption on electrogenerated adsorbents. Electrocoagulations were carried out with aluminum electrodes in CP+ synthetic solutions. After 2 h of electrolysis in 0.1 M NaCl solutions, CP+ was mainly removed by electroreduction at calculated rates of 0.024 and 0.0416 μmol/C corresponding to abatements of 28 and 24% for starting concentrations of CP+ at 0.5 mM and 1.0 mM, respectively. The voltammetric study on steel or graphite electrodes confirmed a possible electroreduction of CP+ which may explain its removal during electrolysis. The change of the cathode from aluminum to carbon or steel did not change notably the removal efficiency of electrolysis in 0.1 M NaCl solution. However, after 2 h of electrolysis in 0.1 M NaCl in the presence of 0.1 M phosphate buffer, CP+ was mainly removed by adsorption on electrogenerated aluminum phosphate with rates of 0.0694 and 0.138 μmol/C corresponding to abatements of 80% for 0.5 or 1 mM CP+ solutions. The key role of phosphate ions was proved by adsorption experiments. The electro-synthesized alumina adsorbed CP+ with a removal capacity of 10.2 mg/g. But on electro-synthesized and chemical-synthesized aluminum phosphate the removal capacities were 94.2 and 165.3 mg/g, respectively
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