Abstract:
Biomass is a material that can be potentially used as a natural fiber resource. Rice husk (RH)
and sugarcane bagasse (SB), respectively containing 36.6% and 60% cellulose, are fibers that have
the potential for biocomposite formation. In this study, an amine magnetic biocomposite (B-MNH2
)
was prepared by a one-step solvothermal reaction. Delignified RH and SB fibers at a ratio of 1:1
were added to a mixture of ethylene glycol, iron chloride, and 1,6-hexanediamine, and kept in a
stainless steel autoclave reactor at 200 ◦C for 6 h. The obtained B-MNH2 contained 64.5% of Fe and
2.63 mmol/g of amine. Its surface area increased significantly from 9.11 m2/g to 25.81 m2/g after
amine functionalization, and its optimum adsorption for Pb(II) ions was achieved within 360 min at
596.82 mg/g and pH 5. Moreover, the pseudo-first-order mechanism fitted well to the adsorption
model. Other parameters, such as chemical oxygen demand (COD), total suspended solid (TSS), and
dye during adsorption were also reduced by about 67.7%, 95.6%, and 89%, respectively. B-MNH2
showed a slight decrease in performance by only 8% after the fourth repeated use. The amine
magnetic biocomposite led to the development of a potential adsorbent due to the high surface
area, stable material, and easy separation, and was capable of absorbing contaminants from an
aqueous solution.
Keywords: biocomposite; Pb(II) ion; amine magnetic; rice husk; sugarcane bagasse; solvothermal
