Optimization of process condition for the preparation of amine-impregnated activated carbon developed for CO₂ capture and applied to methylene blue adsorption by response surface methodology

ABSTRACT

The present research describes the optimal adsorption condition for methylene blue (MB). The adsorbent used here was monoethanol amine-impregnated activated carbon (MEA-AC) prepared from green coconut shell. Response surface methodology (RSM) is the multivariate statistical technique used for the optimization of the process variables. The central composite design is used to determine the effect of activation temperature, activation time and impregnation ratio on the MB removal. The percentage (%) MB adsorption by MEA-AC is evaluated as a response of the system. A quadratic model was developed for response. From the analysis of variance, the factor which was the most influential on the experimental design response has been identified. The optimum condition for the preparation of MEA-AC from green coconut shells is the temperature of activation 545.6°C, activation time of 41.64 min and impregnation ratio of 0.33 to achieve the maximum removal efficiency of 98.21%. At the same optimum parameter, the % MB removal from the textile-effluent industry was examined and found to be 96.44%.

KEYWORDS:

• Activated carbon
• carbon dioxide
• central composite design
• impregnation
• methylene blue
• monoethanol amine
• optimization for adsorption
• response surface methodology
• textile

Acknowledgments

This work was supported by the Chemical Engineering Department, Indian institute of Technology, Kharagpur.