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Rice husk (RH), an agricultural waste, is abundantly available in South Kalimantan. RH has been recycled only for low-value application, although rice husk has the potential to be used as natural fiber. The aim of this research is to produce an adsorbent based on rice husk fiber (RHF) and magnetic nanoparticles (MNPs) and study its performance on Fe3+ ion adsorption, effect on total suspended solid (TSS) and color adsorption. Rice husk was dried (60 mesh), then run through delignification process to eliminate lignin using 1% of NaOH. Rice husk biocomposite (RHB) was produced using a one-pot solvothermal reaction in the presence of RHF and FeCl3⋅6H2O. The surface of RHB was modified by amine group (RBH-MH). As control, the RBH without modification was also produced (RHB-M). The optimum adsorption was reached at pH 5 in a 60-minute period and adsorption capacity for RHB-M and RHB-MH reached 47.63 and 52.46 mg/g, respectively. The RHB-MH also had the capability to adsorb TSS and color, where approximately 87.5% of TSS and 85.81% of color were reduced. Regarding its reusability, the RHB-MH showed a good performance in 4 repeated uses. The addition of amine on the biocomposite may have affected the adsorbent by enhancing its adsorption capacity, reduced TSS and color for reactivity toward a wide range of organic pollutant.

The synthesis of biocomposites from rice husk (RH) fiber and magnetic nanoparticle was made by solvothermal reaction. Rice husk dried was blended to small size (60 mesh), then through delignification process to eliminate lignin by 1% w/v NaOH solution. Delignified rice husk was put into hydrothermal reactor, afterward was carried out by one-pot solvothermal at 200 °C for 6 h in the presence of 1,6-hexanediamine, FeCl3.6H2O and ethylene glycol. The process was produced two types of biocomposites, without amino group (RHB-M) and with amino group (RHB-MH). The characterization results shown by FE-SEM, magnetic nanoparticle have been formed on the surface of RH fiber with diameter size around 30–50 nm could be obtained. X-Ray Diffraction (XRD) analysis showed treatment of ED delignification was increased crystalinity index (CrI) about 16.77% and reduced silica content about 78%. The iron content may affect the adsorbent by enhanching the high-adsorption of sorbent capacity for reactivity toward a wide range of organic pollutan.