Activated Carbon Derived From Pentace Triptera, Intsia Bijuga And Hevea Brasiliensis Sawdust Via Microwave-Induced Potassium Hydroxide Activation For Dyes Adsorption
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Date
2019-04-01
Authors
Khasri, Azduwin
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Synthetic dyes are widely applied in various industries which has resulted in
the water pollution. Therefore, this study aims to synthesis activated carbon (AC) from
Pentace triptera (PS), Intsia bijuga (IS) and Hevea brasiliensis (HS) for methylene
blue (MB) and remazol brilliant violet 5R (RBV) dye adsorption via microwave-induced potassium hydroxide (KOH) activation adopted together with carbon dioxide
(CO2) gasification. Optimum preparation conditions for all ACs prepared were
determined using response surface methodology (RSM). ISAC showed high Bruneaur-Emmet-Teller (BET) surface area and total pore volume of 952.23 m2/g and
0.584cm3/g, respectively compared to PSAC and HSAC. All adsorbents best fitted to the
Langmuir isotherm model with ISAC showed higher maximum monolayer adsorption
capacity (Qm) of 434.78 and 212.77 mg/g, respectively for MB and RBV dye at 30ÂșC.
Kinetic studies showed that all system followed a pseudo-second order model with
film diffusion was the rate-limiting step controlling adsorption. Thermodynamic
studies confirmed that all systems were endothermic in nature. For the column studies,
the better correlation of breakthrough data shown by Thomas and Yoon-Nelson model.
The ACs had good reusability performance for MB and RBV adsorption especially up
to three cycle using ethanol as solvent.