Synthesis of Inverse Spinel Nickel Ferrite Like- Broccoli Nanoparticle and Thermodynamic Study of Photo-decolorization of Alkali Blue 4B dye
نویسندگان
1 Department of Chemistry, College of Science, University of Kerbala, Kerbala, Iraq
2 Department of Physics, College of Science, University of Kerbala, Kerbala, Iraq
3 Department of Chemistry, College of Science, University of Kerbala, Kerbala, Iraq
doi
10.22052/JNS.2022.03.022چکیده
Inverse spinel nickel ferrite (NiFe2O4 (or) NiO.Fe2O3) like- broccoli shape was manufactured as a brown nanoparticle. The NiFe2O4 preparation is done in the presence of the mixture of precursor salts in a ratio (2:1) of the iron ion with nickel ion prior to the presence of a nonpolar surfactant (hexamine). Hexamine acts as a capping agent before adding ammonia to solution; template and stabilizer via growth and storage of its powder. The solvothermal technique aided the precipitation route by using ethanol solvent at 180°C for 90 minutes to depress the defect in the prepared nanoparticle. The XRD data revealed that the NiFe2O4 peaks were wide and had a modest mean crystal size (20.13 nm). The broccoli-like NiFe2O4 nanoparticles with homogenous agglomerations were investigated using SEM- EDX analysis. The particle size is found to be 30.67 nm composing 100% of Ni, Fe, and O atoms. The - FT-IR analysis exhibited the positions of the tetrahedral site for (Fe3+-O2-) and octahedral site peaks for (Ni2+- O2-), and proved the type of NiFe2O4 is an inverse spinal structure. The NiFe2O4 has been owned as an excellent optical property with a small indirect band gap value (2.05 eV). Following this fact, this spinal can be used as a photocatalyst. The best photo-decolorization of this dye took place at pH 7 as a pseudo-first order with efficiency (98 %). This photoreaction is fast, endothermic and non-spontaneous. Negative entropy value refers to the products in this dye decolorization being more regular than the reactant (dye) structure.
