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Received January 30, 2023
Revised February 14, 2023
Accepted February 16, 2023
- This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Biosorption of Methylene Blue from Aqueous Solution using Dried Rhodotorula glutinis Biomass
Abstract
The biosorption of methylene blue (MB) from aqueous solution was investigated using dried Rhodotorula
glutinis as the biosorbent. The effects of pH, initial dye concentration, biosorbent dosage, and kinetic studies were
determined to obtain valuable information for biosorption. Results indicated that most of the adsorbed MB bound within
30 minutes of contact and the MB adsorption capacity increased from 21.1 to 101.8 mg/g with the initial MB concentration
increased from 50 to 300 mg/L. Additionally, the MB adsorption capacity gradually increased from pH 4.0 to 9.0, reaching its
peak at an initial pH of 9.0. As the biomass load was increased from 0.25 to 4.0 g/L, the MB removal efficiency increased
from 14.1 to 84.5%. The Langmuir model provided the best fit throughout the concentration range, and the maximum
adsorption capacity (qmax) and Langmuir constant (b) were determined to be 135.14 mg/g and 0.026 l/mg, respectively.
Furthermore, the biosorbent process of R. glutinis was found to follow pseudo-second-order kinetics and the calculated
qeq,cal value showed good agreement with the experimental qeq value. Overall, the biosorption of MB by R. glutinis can
be characterized as a monolayer, single site type phenomenon, and the rate-limiting step was determined to be the
chemical reaction between the adsorbent and the adsorbate.
Keywords
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