Research article

REMOVAL Of Fe 2+ and Fe 3+ FROM AQUEOUS SOLUTION USING RAW COWPEA HUSK, AND COWPEA HUSK COATED WITH ZINC OXIDE NANOPARTICLE ADSORBENT

Khalaf Ahmed Abdullah* , Khalid Khazal Hummadi

Online First: January 08, 2023


In this study, cowpea husks were used as an adsorption media to recover Fe2+ and Fe3+ from aqueous solutions. Two of the media employed were raw cowpea husk (CPH) and cowpea husk coated with nano-ZnO. (CPHC). SEM, X-ray diffraction, and (FTIR) methods were utilized to evaluate the functional groups, morphological, structural, and percentages of surfactants (SEM),. To create the ideal situation, a number of factors counting pH, connection time, dose, beginning levels, and temperature were altered. The types of interactions involved were identified and described using thermodynamic simulations, adsorption isotherms, and thermodynamic studies. Under ideal conditions, the clearance rates of Fe2+ and Fe3+ varied from 76% and 70% to 94% and 920%, respectively. The removal efficiency rose somewhat with temperature, according to a thermodynamic study based on a optimistic sign of H°, proving the endothermic character of the adsorption process. When the data were fitted using the “Langmuir model”, it was clear that the amount of adsorbent was homogeneous (R2 values for CPH and CPHC, respectively, were 0.959 and 0.923 and 0.972 and 0.935 for Fe2+ and Fe3+). The "second-order kinetic model" providing the best explanation for the investigational consequences, which resulted in the conclusion that chemisorption was the main mechanism underlying the adsorption procedure.

Keywords

Adsorption · Cowpea husk · ZnO nanoparticles · kinetic. heavy metals