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Kinetics, Thermodynamics, and Isotherms of Methylene Blue Adsorption Study onto Cassava Stem Activated Carbon

1
Bioresource Tech. Division, School of Industrial Technology, Universiti Sains Malaysia, George Town 11800, Penang, Malaysia
2
Faculty of Bioengineering and Technology, Universiti Malaysia Kelantan, Jeli Campus, Jeli 17600, Kelantan, Malaysia
*
Author to whom correspondence should be addressed.
Academic Editor: Antonio Zuorro
Water 2021, 13(20), 2936; https://doi.org/10.3390/w13202936
Received: 21 August 2021 / Revised: 21 September 2021 / Accepted: 24 September 2021 / Published: 19 October 2021
(This article belongs to the Section Wastewater Treatment and Reuse)
Water treatment using activated carbon is widely accepted, despite its high production cost. Therefore, this study was aimed to investigate the potential of cassava stem in activated carbon form for methylene blue (MB) dye uptake from water. Raw cassava stem (RCS) was also utilized to evaluate the difference between cassava stem in its raw form and after being converted to the activated carbon (ACS). The MB adsorption from water using the RCS and ACS was done in this study. The batch adsorption study showed fast MB uptake by ACS at 60 min contact time, while higher adsorbent dosage and higher pH contributed to higher adsorption percentage. The thermodynamic study showed positive values of ∆H° of ACS, indicating that the adsorption process of MB was endothermic. Meanwhile, the negative value of ∆G° showed that the adsorption processes of MB were spontaneous. The thermodynamic study showed higher fitting to Langmuir isotherm, with data from the kinetic study showing better pseudo-second-order equation fitting, which suggests the chemisorption process had happened. The highest adsorption recorded by ACS was 384.61 mg/g, indicating the possibility of cassava stem as the lower cost raw material for activated carbon production with excellent adsorption characteristics. View Full-Text
Keywords: cassava stem; activated carbon; methylene blue; batch adsorption; kinetic studies cassava stem; activated carbon; methylene blue; batch adsorption; kinetic studies
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MDPI and ACS Style

Sulaiman, N.S.; Mohamad Amini, M.H.; Danish, M.; Sulaiman, O.; Hashim, R. Kinetics, Thermodynamics, and Isotherms of Methylene Blue Adsorption Study onto Cassava Stem Activated Carbon. Water 2021, 13, 2936. https://doi.org/10.3390/w13202936

AMA Style

Sulaiman NS, Mohamad Amini MH, Danish M, Sulaiman O, Hashim R. Kinetics, Thermodynamics, and Isotherms of Methylene Blue Adsorption Study onto Cassava Stem Activated Carbon. Water. 2021; 13(20):2936. https://doi.org/10.3390/w13202936

Chicago/Turabian Style

Sulaiman, Nurul S., Mohd H. Mohamad Amini, Mohammed Danish, Othman Sulaiman, and Rokiah Hashim. 2021. "Kinetics, Thermodynamics, and Isotherms of Methylene Blue Adsorption Study onto Cassava Stem Activated Carbon" Water 13, no. 20: 2936. https://doi.org/10.3390/w13202936

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