Calcinated MIL-100(Fe) as a CO 2 adsorbent to promote biomass productivity of Arthrospira platensis cells

In order to solve the problems of short residence time and low diffusion of CO gas in microalgal solution, calcinated metal-organic framework MIL-100(Fe) were first used as CO adsorbents to promote the growth of Arthrospira platensis cells by increasing carbon fixation. The adsorbent (MIL-100(Fe)-4 h) containing unsaturated metal sites, improved the conversion of CO to dissolved inorganic carbon by 52.3% and concentration of HCO by 20.0% in culture medium, as compared to the medium without CO adsorbent added. The increased HCO concentration facilitated carboxysome accumulation (increased to 21.7 times) to activate the photosynthetic Calvin cycle in Arthrospira cells. The increased cell growth rate promoted cell volume by 132% and knot length by 102%, while the fractal dimension of the cell surface decreased by 13.5%. The biomass productivity of Arthrospira cells cultivated with the CO adsorbent MIL-100(Fe)-4 h remarkably increased by 81.9%.