Abstract
• Nano bio-composite were prepared from DBP@Fe 3 O 4 . • The synthesis method used for DBP@Fe 3 O 4 based sorbent is green and economically viable. • Co-precipitation and complexation were characterized as the mechanisms responsible for uranium (VI) exclusion. • Pseudo-second-order kinetic model proved ideal for uranium sorption. The research aims to utilize green synthesized magnetic drumstick bark powder (DBP@Fe 3 O 4 ) to remove U (VI) ions from aqueous solutions. The adsorbent was characterized by SEM-EDX, FTIR and XRD analyses. DBP@Fe 3 O 4 has a maximum U (VI) uptake is 92.8% from U (VI) concentration 25 mg/L, at pH 7, with 0.04 g dose on 30°C, and contact time 40 min. The linear isotherm and kinetics models showed that the U (VI) adsorption onto DBP@Fe 3 O 4 was fitted well by the Langmuir (r 2 =0.99) and the pseudo second-order kinetic model (r 2 = 0.99). The sorption-desorption cycle for U (VI) recovery study onto DBP@Fe 3 O 4 adsorbent revealed that this adsorbent has good stability up to 5 cycles (87.8 % desorption with 0.1 M HCL). The important properties of DBP@Fe 3 O 4 maximum adsorption capacity (Q o = 135.13 mg/g), low cost and environmentally friendly synthesis which make it as a good adsorbent for removing U(VI) ions from aqueous.
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