Effect of Sodium Periodate on the Adsorption Capacity of Silica-Lignin from Rice Husk on Chromium(VI)

• Main Authors: Yati B. Yuliyati, Solihudin Solihudin, Atiek Rostika Noviyanti
• Format: Article
• Language: English
• Published: Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University 2019-11-01
• Series: Jurnal Kimia Sains dan Aplikasi
• Subjects: adsorption; chromium(vi); halsey equation; rice husk; silica-lignin activation.
• Online Access: https://ejournal.undip.ac.id/index.php/ksa/article/view/24829

Reactive groups such as silanol, hydroxyl, and carbonyl groups in silica-lignin composites play a role in binding to chromium(VI) ions. The activation of functional groups in silica-lignin can be increased by the addition of an activator such as sodium periodate, which can also oxidize the lignin monomer (guaiasil) to ortho-quinone. This study aimed to obtain silica-lignin composites from rice husks activated by sodium periodate with a high surface area. Composite absorption was tested on chromium(VI) adsorption. Silica-lignin isolation was carried out by using the sol-gel method at concentrations of sodium hydroxide 5, 10, 15, and 20% (b/b). Silica-lignin activated with sodium periodate 10% (b/b) had the smallest particle size of about 8μm, with a surface area of 14.0888 m2.g-1 and followed Halsey isotherm adsorption model, with an adsorption capacity of 0.3054 mg.g-1.