Adsorptive Removal Methylene-Blue Using Zn/AlLDH Modified Rice Husk Biochar
Aldes Lesbani, Patimah Mega Syah Bahar Nur Siregar, Neza Rahayu Palapa, Tarmizi Taher, Fahma Riyanti
Abstract
Composite based Zn/Al layered double hydroxide and biochar was successfully synthesized by liquid deposition treatment following characterization using x-ray, infrared, nitrogen adsorption desorption, thermal, and morphology analyses. Composite was used as removal agents of methylene blue in aqueous solution. Factors that influencing adsorption such as pH medium, adsorption time, initial concentration, and temperature adsorption were studied systematically. The performance of adsorbent was evaluated by adsorption regeneration process. The results showed that composite has diffraction peak at 10.10 o and 21.30 o due to diffraction of Zn/Al and biochar. Composite has higher surface area properties (58.461 m 2 /g) than Zn/Al layered double hydroxide (9.621 m 2 /g) and biochar (50.936 m 2 /g). Thermal analysis showed that composite has two endothermic peaks at 90 o and 120C also one exothermic peak at 500C. Methylene blue removal on composite was achieve at pH 5 and follow PS-O kinetic model with k 2 lower than starting materials. The adsorption energy of composite in the range of 17.309 kJ/mol and categorized as physical adsorption. Composite has high reusability of adsorbent until three cycles process without loss significant adsorption ability, which has different with biochar and Zn/Al layered double hydroxide.