Platinum recovery from model media and a Pt–Sn/alumina spent catalyst extract using corn husk-based adsorbent

• Corn husk-based adsorbent is synthesized via acid treatment/amine immobilization.
• Sorption of platinum ions from model media/catalyst extract is examined.
• The adsorbent with amine immobilization shows superior adsorption capacity.
• The adsorption capacity of adsorbents and kinetics of adsorption are determined.
• Aluminates interfere in adsorption, and platinum is obtained in elemental form.

Preparation of corn husk-based adsorbent for platinum recovery is studied. The adsorbents are prepared and characterized, and the adsorption of platinum onto the adsorbents is examined. Results indicate that hydroxyl and amine groups are responsible for adsorption of platinum onto the adsorbents. Immobilized amine enhances the adsorption and aluminates interfere in adsorption of platinum ions. The adsorption capacity of the adsorbent with immobilized amine for model media and intact solution is 38.5 and 16.2 mg Pt/(g adsorbent), respectively. Structural changes of the treated corn husk is explained by Mannich mechanisms. The kinetics of adsorption of Pt follows a pseudo-second-order model.

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