Synthesis of α-and β-CoNi binary hydroxides nanostructures as catalyst for hydrogen peroxide detection using the luminol chemiluminescence system

Hydrogen peroxide (H2O2) is one of the simplest oxidants that find in natural waters. It is also one of the most common oxidants used in the chemical synthesis. From the environmental point of view, the trace determination of H2O2 in water has a considerable importance. Among techniques occurred for H2O2 determination, chemiluminescence has received increasing interest due to higher sensitivity, instrumental simplification, lower detection limit and low cost [1]. The synthesis of layered materials with nanostructures as catalyst for analytical measurements and organic reactions has been intensively studied. This study reports the synthesis of α-and β-CoNi binary hydroxides nanostructures as catalyst for determination of H2O2 using the luminol chemiluminescence system. The β-hydroxides are composed of neutral metal hydroxide layers similar to brucite-like structure in which M2+ is surrounded octahedrally by six hydroxyl ions, while the α-hydroxides are isostructural with hydrotalcite-like compounds (LDHs) and consist of positively charged layers of metal hydroxides that are separated by intercalated anions and water molecules in the gallery to restore charge neutrality [2]. The catalysts were characterized by XRD, Fe-SEM/EDX, FT-IR, TGA and UV-vis spectroscopy. Experimental results showed that the CL emission intensity was linear with hydrogen peroxide concentration in the range of 1×10-5 to 1×10-7 mol L-1 with a detection limit of 8×10-8 mol L-1 under optimized conditions.