▎ 摘　　要

In this study, a nanocomposite containing a reduced-graphene-oxide aerogel decorated with Pd nanoparticles (rGO-A/Pd-NP), an rGO-A/Pd-NP sensor, and a RuO2-IrO2-rGO-A/Pd-NP composite electrode were prepared to electrochemically detectp-nitrophenol and elucidate the mechanism underlying electrochemical oxidative p- nitrophenol degradation. The composite electrode exhibited an outstanding electrolytic p-nitrophenol removal efficiency (96.1%) in addition to a noteworthy chemical oxygen demand and total-organic-carbon removal effi-ciency (88.4% and 70.2%, respectively). Optimalp-nitrophenol decomposition was achieved using an initialp- nitrophenol concentration of 50 mg mL-1, a pH of 3, and a current density of 40 mA cm-2. p-Nitrophenol was found to decompose via electrochemical oxidation by hydroxyl radicals generated on the anode surface, with the reaction following pseudo-first-order kinetics. The rGO-A/Pd-NP sensor showed excellent reduction-based p-nitrophenol sensing performance (linear range, 0.1-20 mg L-1 [R2 = 0.9919]; detection limit, 0.052 mg L-1). Overall, an organic contaminant in natural water was rapidly detected using a sensor electrodeposited with the rGO-A/Pd-NP nanocomposite, and the electrolytic p-nitrophenol removal efficiency was improved by incorporating functional rGO-A/Pd-NP particles into a Ti/RuO2-IrO2 electrode. The convergent technology reported herein for detecting and removing harmful substances will open a new avenue for nanocomposite cat-alyst applications in electroanalytical chemistry.