Synthesis of chitosan composite of metal organic framework for the adsorption of dyes, kinetic and thermodynamic approach

Title : Synthesis of chitosan composite of metal organic framework for the adsorption of dyes, kinetic and thermodynamic approach

Abstract:

The iron metal-organic framework composite with chitosan (CS/MOF-235) was synthesized using solvothermal method and its synthesis was confirmed by various characterization techniques. The chitosan composite of the iron metal-organic framework (CS/MOF-235), MOF-235 and chitosan were used for the removal of methylene blue (MB) and methyl orange (MO) from aqueous solutions. The maximum adsorption capacities were found to be 2857 - 2326 mg/g for CS/MOF-235, 357 – 236 mg/g for MOF-235 and 209-171mg/g for chitosan (CS) which reveal that the adsorption capacity of CS/MOF-235 is almost 10 and 14 times greater than MOF-235 and chitosan.  The adsorption selectivity of the (CS/MOF-235) towards the dye was in the order MO > MB.  Moreover, hydrogen bonding, pi-pi and pore-filling and electrostatic attraction were proposed as possible mechanisms for the removal of dyes onto CS/MOF-235. 
The intraparticle diffusion and Richenberg models confirmed that the adsorption process was controlled by the film diffusion. The negative values of the isosteric heat of adsorption (Δ¯H) fall with surface coverage indicating that a lesser amount of heat is required for the greater uptake of dyes.

Biography:

Dr. Tooba Saeed is an Assistant Professor at the National Centre of Excellence in Physical Chemistry, University of Peshawar, Pakistan. She completed her Ph.D. in 2022 under the supervision of Prof. Dr. Abdul Naeem, where her research focused on the synthesis and spectroscopic characterization of metal-organic frameworks (MOFs) and their polymer composites for applications in adsorption, photocatalytic degradation of organic pollutants, and biodiesel production. Dr. Saeed has made significant contributions to the field of catalysis, green energy, and environmental remediation. She has authored over 41 peer-reviewed research articles, 12 international book chapters, and holds 12 patents, of which 5 have already been granted. In addition, she has supervised postgraduate students and actively engages in collaborative projects. Her current research interests include advanced functional materials (MOFs, COFs, POPs and their polymer composites) for catalysis, CO₂ capture, energy storage, and sustainable energy solutions. She is passionate about bridging innovative research with real-world environmental and energy challenges.