Enhancement thermal stability and CO2 adsorption property of ZIF-8 by pre-modification with polyaniline

Abstract

In this study, the thermal stability and CO _2 adsorption property of ZIF-8 were effectively improved by using parallel flow-drop solvothermal method. -NH _2 was successfully introduced into the surface of ZIF-8 and their structures by pre-modification with polyaniline. XRD analysis shown that the intensity of ZIF-8 characteristic peak increased with the increase doped content of polyaniline, but the crystal structure of ZIF-8 remained unchanged. FTIR analysis shown that the two new peaks at 1609 and 690 cm ^−1 can be attributed to the -NH _2 bonding of ZIF-8. TGA analysis shown that the thermal stability of NH _2 -ZIF-8 was 632.71 °C. SEM analysis shown that the increase of CO _2 adsorption property was due to the increase of NH _2 -ZIF-8 cubic crystal system. It was found that BET surface area was 789.7 m ^2 g ^−1 , micropore volume was 0.55 cm ^3 g ^−1 , pore size was 0.99 nm by taking the molar ratio of metal ions to ligands being 1:2, and the molar ratios of polyaniline to metal ions being 12%.

Keywords

• NH2-ZIF-8
• parallel flow-drop solventthermal method
• CO2 adsorption property
• thermal stability
• pre-modification