Novel and Effective Pyrimidone Derivative Adsorbent for Adsorptive Removal of Cationic Methylene Blue Dye: Isotherm, Kinetic, and Thermodynamic Studies

Document Type : Original Article


1 Research Scholar, Pg& Research Department of Chemistry, Jamal Mohamed College (Autonomous)

2 National Postdoctoral Fellow, Department of Carbohydrate Chemistry, Indian Institute of Science, Bangalore

3 Department of Chemistry College of Sciences King Saud University Riyadh Saudi Arabia

4 Department of Chemistry College of Science King Saud University Riyadh

5 Faculty of Chemistry, National and Local United Engineering Laboratory for Power Batteries Northeast Normal University, Changchun, 130024, China

6 Post Graduate and Research Department of Chemistry, Jamal Mohamed College, Bharathidasan University, Tiruchirappalli, Tamilnadu,620 020, India


Adsorbents based on carbonaceous materials, polymers, clays, and inorganic materials are common in the literature, but adsorbents designed from organic materials such as self-assembled heterocyclic compounds have not been studied so far. In this study, a new adsorbent pyrimidone derivative (DHPM) was synthesised employing a green protocol to tone down the cationic dye Methylene Blue (MB) from aqueous solution. The synthesised self-assembled bio-inspired molecules is characterized using Ultraviolet Spectroscopy (UV-Vis), Fourier transform infrared (FT-IR), 1H NMR & 13C NMR and Thermogravimetric analysis (TGA). The self-assembled molecule's propensity to adsorb MB dye was investigated as a function of MB concentration, time, temperature, pH and adsorbent dosage. The enhancement of adsorption capability over the cationic dye has been discussed in this script. A detailed examination of the adsorption kinetics revealed that the study conforms to pseudo-second-order model. Isothermal adsorption study over the MB dye were used with several models. Langmuir-Freundlich model was found to be the most accurate, with an adsorption capacity of 233.99 mg/g. The results are endothermic and spontaneous for the thermodynamic study of adsorption over MB dye onto the pyrimidone derivative.