Description:
We developed a versatile solvothermal method to synthesize HP–Cu–BTCs series (HP–Cu–BTC(CTAB), HP–Cu–BTC(N,N), HP–Cu–BTC(SDBS)), by using a cationic surfactant (cetyltrimethylammonium bromide, neutral organic amine and an anionic surfactant as the template, respectively, with open metal coordination site Cu(I), cage window sites, tunable porosity, high specific surface area, cavity, etc. which have a higher adsorption capacity for CO 2 compared to the parent Cu–BTC, namely, 7.4293 mmol/g of HP–Cu–BTC(N,N) at 100 kPa and 273.15 K. The samples before and after CO 2 cycle adsorption at 303 K were characterized using X–ray diffraction, FT–IR spectroscopy, thermal analysis and SEM. etc. The results showed that the synthesized HP–Cu–BTC(N,N) possessed a high BET specific surface area (1194.06 m 2 /g) and total pore volume (0.63 cm 3 /g). Adsorption isotherm revealed that the synthesized HP–Cu–BTC(N,N) not only has high CO 2 adsorption capacity (7.4293 mmol/g) but also good selectivity (37.20). Besides, FT–IR spectroscopy, CO 2 –TPD curves and adsorption kinetic curve demonstrated that the adsorption mechanism of synthesized HP–Cu–BTC(N,N) was mainly attributable to physisorption and it could be regenerated at relatively low temperature. The mesoporous structure not only enhance the CO 2 uptake capacity but also improve the diffusion and mass transportation of CO 2 . At the same time, the CO 2 –TPD showed that the desorption activation energy of CO 2 on HP–Cu–BTC(N,N) was higher than that on traditional Cu–BTC, indicating a stronger interaction between CO 2 molecules and open metal sites in the HP–Cu–BTC(N,N). Thus, the CO 2 /N 2 adsorption selectivity of the HP–Cu–BTC(N,N) was significantly higher than that of traditional Cu–BTC