PP/PVDF Hollow Fiber Membrane Coatings for CO2 Capture: Interaction Parameters via Box-Behnken Design

Polyvinylidene fluoride (PVDF) membrane has shown potential for CO2 capture due to their chemical stability and mechanical strength. The coating process using polypropylene (PP) influenced the CO2 flux. This study optimises the coating parameters on the PVDF membrane using Box-Behnken Design (BBD). Key factors examined were methyl ethyl ketone (MEK) concentration, operating time and coating cycles. The investigated PVDF membrane was employed in the membrane gas adsorption (MGA) to examine the CO2 flux. Experimental data were fitted to a second-order polynomial quadratic model, yielding an R2 value of 0.9028, indicating a strong fit. The optimisation revealed that 25% MEK concentration, 30 min of operating time and single coating cycle obtained the highest desirability score of 0.945. Significant factors include the MEK concentration (p-value of 0.0228), operating time (p-value of 0.0018) and coating cycles (p-value of 0.0164). This model effectively captures the linear and interaction effects of the variable on the CO2 flux. The optimised parameters significantly enhance the CO2 flux, contributing to the development of a high-performance membrane for CO2 capture. The application of the optimised PVDF membrane in MGA system demonstrates its efficiency in CO2 separation. This study advances membrane technology, providing a robust framework for future research in CO2 separation.