SYSTHETIC OF SUGARCANE BAGASSE BIOCHAR COMBINED Fe3O4 AND Fe3O4@ZnO NANOPARTICLES AND ADSORPTION OF HEAVY METALS (Pb, As, Cr, Cd) FROM AQUEOUS SOLUTION

Abstract

This study synthesized sugarcane bagasse biochar (SBB) and SBB combined Fe₃O₄ and Fe₃O₄@ZnO by wet-impregned method. In addition, these above materials were used to remove heavy metals (Pb, As, Cr, Cd) in an aqueous solution by adsorption. The characteristics of SBB, Fe₃O₄/SBB and Fe₃O₄@ZnO/SBB were evaluated by scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), Fourier transform infrared spectra (FTIR), XRD and Brunauer–Emmett–Teller (BET) surface area. The adsorption process of SBB, Fe₃O₄/SBB and Fe₃O₄@ZnO/SBB for heavy metals (Pb, As, Cr, Cd) were evaluated through batch experiments to examine various parameters, including nano weight ratio (10-30%) and solution pH. The results show that adsorption performance of heavy metals reached 38.91%, 42.43%, 47.59% (Cd), 29.77%, 45.84%, 57.93% (As), 41.72%, 70.45%, 77.41% (Pb) and 46.52%, 55.31%, 61.82% (Cr) using SBB, Fe₃O₄/SBB and Fe₃O₄@ZnO/SBB, respectively. Also, the adsorption capacity of SBB, Fe₃O₄/SBB and Fe₃O₄@ZnO/SBB achieved 28.64 mg/g, 31.44 mg/g, 35.56 mg/ g (Cd), 22.24 mg/g, 34.33 mg/g, 43.20 mg/g (As), 30.70 mg/g, 52.69 mg/g, 57.42 mg/g (Pb) and 34.28 mg/g, 40.27 mg/g, 45.29 mg/g (Cr), respectively. The optimal conditions for the adsorption process were achieved at 20% nano-binding ratio, solution pH 7-8 for Pb, As, Cd adsorption and 3 for Cr.