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Updated: Feb 14, 2026

Assessment of Waste-Derived Biochars on the Health and Biological Activity of Soil
Published on: October 10, 2025
Adsorption of Methylene blue and Rhodamine B by using biochar derived from Pongamia glabra seed cover
Neonjyoti Bordoloi1, Manash Deep Dey2, Rupak Mukhopadhyay2
1Department of Energy, Tezpur University, Tezpur, Assam 784028, India
Abstract:
Biochar obtained through the pyrolysis of Pongamia glabra seed cover (PGSC) at 550 °C with a heating rate of 40 °C/min was characterized and its ability to adsorb the dyes Methylene blue (MB) and Rhodamine B (RB) from aqueous solutions was investigated. The effect of pH, temperature and initial concentration of the dyes on adsorption behavior were investigated. The equilibrium sorption data were analyzed by using Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich (D-R) isotherms. Equilibrium data were well fitted for D-R isotherm in case of MB and Langmuir isotherm in case of RB dyes. The kinetics of dye adsorption on PGSC biochar was well described by applying pseudo-second-order rate equations. The surface of adsorbent before and after the removal of dyes was characterized by using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) analysis. The study suggested that PGSC biochar could be used as a highly efficient adsorbent for the removal of synthetic dyes.
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