Nanomaterial assisted removal of pollutants from water has got great attention. This study aimed to evaluate the removal of nitrate using zeolite and zeolite-ZnO nanocomposite. Zeolite-ZnO nanocomposite was prepared by the co-precipitation method. The physicochemical characteristics of the nanomaterials were determined using XRD, SEM, FTIR, and its chemical composition was determined using AAS. The results revealed that; Zeolite-ZnO nanocomposite with 13.12 nm particle size has successfully been loaded into the zeolite. The removal efficiency of nitrate from spike water was studied using a batch experiment. The removal of nitrate was investigated as a function of adsorbent dose, pH, initial concentration of nitrate, contact time, and agitation speed. Moreover, the adsorption isotherm and kinetics were also determined. The results showed that the removal of nitrate was 95% at an optimum dose of 0.5, pH5, initial nitrate concentration of 50 mg/L, the contact time of 1hour, and agitation speed of 160 rpm. The removal of nitrate has been fitted well by the Langmuir isotherm model with correlation coefficients of R2= 0.988. Thus, indicating to the applicability of monolayer coverage of the nitrate ion on the surface of the nanocomposite. The adsorption process follows the pseudo-second-order model with R2=0.998. The results of this work will have application in improving the treatment of nitrate polluted water.
Keywords: Adsorption, Nano composite, Optimization, Spike