Metal-Organic Framework Adsorbent for Practical Capture of Trace Carbon Dioxide

Control of indoor CO₂ concentration to a safe level is important to human health. Metal-organic-framework-based adsorbents show superior adsorption performance at moderate CO₂ concentration compared to other solid adsorbents but suffer from low capacities and high regeneration temperature at indoor CO₂ concentrations and poor humidity stability. Herein, we report epn-grafted Mg₂(dobpdc) (epn = 1-ethylpropane-1,3-diamine) showing a CO₂ capacity of 12.2 wt % at an acceptable concentration of 1000 ppm and a practically low desorption temperature of 70 °C, which surpasses the performance of conventional solid adsorbents under the given conditions. After poly(dimethylsiloxane) coating, this material reveals a significant adsorption amount (∼10 wt %) in humid conditions (up to 98% relative humidity) with structural durability.