Comparing and Optimizing Nitrate Adsorption from Aqueous Solution Using FePt Bimetallic Nanoparticles and Anion Exchange Resins

Abstract EN

This research work was carried out for the removal of nitrate from raw water for a drinking water supply.

Nitrate is a widespread ground water contaminant.

Methodology employed in this study included adsorption on metal based nanoparticles and ion exchange using anionic resins.

Fe/Pt bimetallic nanoparticles were prepared in the laboratory, by the reduction of their respective salts using sodium borohydride.

Scanning electron microscope, X-ray diffraction, energy dispersive spectrometry, and X-ray florescence techniques were utilized for characterization of bimetallic Fe/Pt nanoparticles.

Optimum dose, pH, temperature, and contact time were determined for NO3- removal through batch tests, both for metal based nanoparticles and anionic exchange resin.

Adsorption data fitted well the Langmuir isotherm and conformed to the pseudofirst-order kinetic model.

Results indicated 97% reduction in nitrate by 0.25 mg/L of Fe/Pt nanoparticles at pH 7 and 83% reduction in nitrate was observed using 0.50 mg/L anionic exchange resins at pH 4 and contact time of one hour.

Overall, Fe/Pt bimetallic nanoparticles demonstrated greater NO3- removal efficiency due to the small particle size, extremely large surface area (627 m2/g), and high adsorption capacity.