Electrooxidation of p-nitrophenol on organobentonite modified electrodes

• HDTMA, DDTMA and TMA bentonites were tested in the electrooxidation of p-NP.
• TMA-bentonite proved to be the best electrode material among the tested organobentonites.
• The influence of TMA loading in organobentonite was investigated.
• The highest signal toward p-NP was obtained for 0.2 TMA-B (TMA loading equal to 20% of CEC).

A natural bentonite, modified with different quaternary ammonium cations, hexadecyl trimethylammonium, (HDTMA), dodecyl trimethylammonium (DTMA) and tetramethylammonium (TMA), was used as an electrode material in a p-nitrophenol (p-NP) electrooxidation. On the basis of electrochemical response, TMA-modified bentonite (TMA-B) electrode was chosen for further investigations. The influence of TMA loading on the electrochemical properties of the TMA-B electrodes toward p-NP electrooxidation was examined. Electrode sensitivity toward p-NP was performed. The detection limit for p-NP of 1 · 10− 6 mol dm− 3 was obtained.