Synthesis and characterization of Ni-Cr-NO3 layered double hydroxide prepared by co-precipitation at hydrothermal condition

Layered double hydroxides are nanostructured materials with positive charge which can form nanobiohybrids in combination with biomolecules with negative charge (such as vitamins, drugs and DNA strings). In this research project Ni-Cr-LDH was synthesized with metal ratio of 3:1by co-precipitation method at hydrothermal conditions. These solutions were kept at pH 10.5. The optimal operating conditions was reported T=65°c and time=24 h.The prepared LDH was characterized by X-ray diffraction (XRD), fourier transform infrared spectrometer (FT-IR), ultra violet (UV), cyclic voltametery (CV) and scanning electron microscopy (SEM). The XRD patterns exhibit the characteristic reflections of LDH which are sharp and symmetric at low 2θ angle. In the FT- IR spectra an intense and broad adsorption band located at 3510 cm-1 was observed, which was attributed to the OH stretching due to the presence of hydroxyl groups and interlayer water molecule of LDH. λmax of Ni and Cr salts were different with λmax of LDHin the UV spectra.The electrochemical investigations in different pH revealed that the obtained electrode can be used as a sensor and was used in presence of 2-nitro phenol electrocatalysis.