Search

Abstract: Mesoporous carbon nitride (MCN) and carbon nitride–carbon (MCN/C) composites with a partly graphitized structure are synthesized by using mesoporous silica SBA-15 as a hard template and ethylenediamine and carbon tetrachloride as precursors, possessing uniform mesopore size of 6.3nm, high surface area of 278–338m2/g, and high nitrogen content of 20.5–24.9% with abundant basic sites. The synthesized MCN and MCN/C composites are used as adsorbents for CO2 capture, showing high adsorption capacity and good reusability. The presence of carbon coating layer in MCN/C composites introduced more micropores, which favored the capture of CO2, exhibiting high CO2 capture capacity of 3.05mmol/g at 0°C and 2.35mmol/g at 25°C and 760mmHg, with good CO2/N2 selectivity and excellent regeneration stability. [Copyright &y& Elsevier]

Abstract: Zirconium ribonucleotides were grafted onto SBA-15 by a one-pot condensation process using ZrOCl2 and 5′-adenylic acid (or 5′-cytidylic acid) as precursors. The ordered mesoporous structure with high surface area was well preserved in the obtained materials, exhibiting high capacity for CO2 capture of 1.96–1.99mmolg−1 at 25°C and 1.0atm, with excellent reusability. The large CO2 capture capacity was comparable to or even higher than the previously reported amino functionalized mesoporous silica materials, which benefited from the large amount of amino and hydroxyl groups in the hybrid pore wall. It was the first illustration of substituted phosphate surface functionalized mesoporous silica materials, which would open a new area for the preparation of hybrid materials from biomolecules. [Copyright &y& Elsevier]