Malachite green and methylene blue dye removal using modified bagasse fly ash: Adsorption optimization studies
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Date
2024
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier BV
Abstract
Utilizing Bagasse Fly Ash (BFA) as an adsorbent, a byproduct from the sugar industry, proved effective in
removing a mixture of Malachite Green and Methylene Blue dyes from aqueous solutions. To enhance its efficacy,
the fly ash underwent chemical modification and underwent detailed characterization using FTIR, XRD, SEM,
and TGA analyses. Subsequently, adsorption studies were conducted to optimize critical parameters—initial dye
concentration, contact time, and pH levels—employing a Mixed-Level Factorial design to pinpoint the most
favorable conditions for efficient dye removal. The modified Bagasse Fly Ash (BFA) resulted in a maximum
adsorption capacity of 18.75 mg/g (71.5 %) for Malachite Green and 15.5 mg/g (67.2 %) for Methylene Blue at
initial dye concentration of 100 mg/L, pH of 9.6, and time of 51.5 min. Analysis of the sorption data involved
rigorous application of both Langmuir and Freundlich isotherm models, revealing a strong fit of the linear
representation to the data for both dyes. Specifically, R2 values of 0.97 and 0.93 were observed for Malachite
Green, while notably higher values of 0.99 and 0.96 were obtained for Methylene Blue, affirming an excellent
model-data agreement. Additionally, a kinetic study revealed that the dye adsorption process (MB and MG)
followed the pseudo-second-order kinetic model (R2 > 0.99), indicating that chemisorption as dominant
adsorption mechanism and providing valuable insights into the dynamic behavior of the process.
Description
Full text. Available at https://doi.org/10.1016/j.envc.2023.100829
Keywords
Adsorption modeling, Methylene blue dye, Malachite green dye, Optimization, Textile wastewater
Citation
Meskel, A. G., Kwikima, M. M., Meshesha, B. T., Habtu, N. G., Naik, S. C. S., & Vellanki, B. P. (2024). Malachite green and methylene blue dye removal using modified bagasse fly ash: Adsorption optimization studies. Environmental Challenges, 14, 100829.