| 초록 |
Conventionally, MIL -101(Cr) was directly derived from analytically pure trivalent chromium (Cr3+) with the assistance of HF. This work provided for the first time a novel method of HF –free synthesis of MIL -101(Cr) from wastewater model containing high concentration of Cr (VI). Cr(VI) was first reduced by sulfite to obtain Cr(III), and the resulting solution was directly used as precursor for MIL -101(Cr) synthesis under free – HF condition. The synthesized MIL -101(Cr) had BET surface area of 2800 m2.g-1. Gas adsorption (CO, CO2, N2) was tested on the prepared MIL -101(Cr) after doping with various amount of Cu(II) and reduced under vacuum condition to obtain Cu(I)@MIL -101(Cr). The results show that 40Cu(I)@MIL -101(Cr) had high CO uptake capacity of 2.82 mmol.g-1, which was higher than both CO2 (0.80 mmol.g-1) and N2 (0.07 mmol.g-1). The IAST –predicted CO/CO2 and CO/N2 selectivity was 320 and 36 at pressure of 100 kPa, respectively. Regeneration of adsorbent experiments show that the Cu(I)@MIL -101(Cr) had excellent CO adsorption –desorption after 6 cycles. |
