In this study, chitosan-bleaching earth clay composite (Chi-BE) was prepared in three different ratios (1:0.4,
1:0.6 and 1:0.8) by the alkali gelation method for carbon dioxide (COv adsorption in a fixed-bed adsorption system. Chi-BE (1:0.6) with best adsorption capacity was selected through fractional factorial design and characterised through Brunauer-Emmett-Teller, scanning electron microscope a nd Fourier transform infrared analyses. The C02 adsorption study was carried out via a central composite design and optimised it using de Optimisation sirability function. Results showed significantly positive roles of temperature, adsorbent loading and C02 concentration on C02 adsorption by Chi-BE within the range and individual levels. However, only adsorbent load ing and C02 concentration presented a mutual effect on C02 adsorption. The optimised factor levels of 38.13 'C for temperature, 0.72 g for adsorbent loadi ng and 25% C02 concentration were obtai ned, which resuited in the C02 adsorption capacity of 344.98 mg/g. The regeneration study revealed that the spent Chi-BE was recycled 10 times. This study suggests that Chi-BE is an effective and stable C0 2 adsorbent under moderate environment.
Chitosan-bleaching earth clay composite as an efficient adsorbent for carbon dioxide adsorption Process optimization_M. Azharul Islam, Y. L. Tan