Recovery of Acrylic Acid Using Calcium Peroxide Nanoparticles: Thermodynamics and Continuous Column Study.

The thermodynamic parameters (▵ G°, ▵H° and ▵S°) for adsorption of acrylic acid on CaO₂ nanoparticle were estimated in the temperature range of 300.15 - 313.15 K, which helps to evaluate the feasibility of adsorption process, nature of adsorption process and affinity of adsorbent toward solute molecule. A dynamic adsorption study in a fixed-bed column was performed using CaO₂ nanoparticle for the recovery of acrylic acid from aqueous stream. The breakthrough curves of adsorption system were obtained for different process variables, such as initial acrylic acid concentration (2882-7206 mg L^-1), flow rate (5-9 mL min^-1) and bed height (10-20 cm). The bed-depth service time model, Thomas model, Yoon-Nelson model and deactivation kinetic model were applied to the experimental data to predict the column performance. The data were in good agreement with the deactivation kinetic model. The presented results may be useful for the design of adsorption system using nanoparticles, which can be further extended to other systems. [ABSTRACT FROM AUTHOR]