Open AccessActivated Carbon based Rice Husk for Highly Efficient Adsorption of Methylene Blue: Kinetic and Isotherm
Author(s) -
Tran Tan,
Hong T. T. Nguyen
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1092/1/012078
Subject(s) - husk , freundlich equation , activated carbon , langmuir , adsorption , sorbent , chemistry , langmuir adsorption model , methylene blue , pulp and paper industry , wastewater , nuclear chemistry , environmental engineering , environmental science , organic chemistry , botany , biology , catalysis , engineering , photocatalysis
Agricultural waste is a resource that is renewable and readily available and is used as a precursor to coal synthesis in industry. In this study, agricultural waste from rice husk was used as precursors to prepare activated carbon, which was activated by KOH. The effectivity factors including time contact, concentration, pH solution, and sorbent dosage play an important role in removing MB in water media. Moreover, the MB adsorption efficiency reached over 80 % at a concentration of 50 mg/L, pH 8 within 180 minutes. The kinetic analysis via pseudo-first-order, pseudo-second-order, Bangham, and Temkin model showed that MB adsorption followed pseudo-second-order (R2 = 0.99934). The fitness of equilibrium data to popular isotherm equations such as the Langmuir, Freundlich, Elovich, Temkin and Dubinin-Radushkevich were carried out. Among all tested isotherm models, Langmuir model is the best fitted to equilibrium data (R2 = 0.99924). The results of this study show that activated carbon made from rice husk has the potential to be used to remove the dye in wastewater treatment.