2.2 Assembly of membrane adsorber
The schematic diagram of the membrane adsorber assembling is shown inFigure 1 . The PES membrane is immersed in ethanol to remove impurities before the immobilization of HP-HKUST-1 in membrane pores. After that, the Cu(NO3)2 solution (3.64g Cu(NO3)2·3(H2O) dissolved in 100 mL deionized water) is permeated through the membrane pores. Then, the membranes were transferred into a vacuum oven and dried at 60 °C for 30 min. Then, 1, 3, 5-benzenetricarboxylic acid solution mixed with N, N, N, N-tetramethyl-1, 6-hexanediamine (1.75 g 1,3,5-benzenetricarboxylic acid and 3.86 g N, N, N, N-tetramethyl-1, 6-hexanediamine dissolved in methanol) was permeated through the membranes, followed by drying the membrane at 60 °C for 30 min. Repeating the above two processes the required HKUST-1 particles can be immobilized in membrane pores, named as HKUST-1/PES membrane. At last, the membrane was placed in the ultrasonic cleaner for washing off the unstable nanoparticles. In order to obtain the HP-HKUST-1 in membrane pores, the HKUST-1/PES membrane was placed into an oven overnight with temperature kept at 393 K for N, N, N, N-tetramethyl-1, 6-hexanediamine removal. In addition, the hydrothermally synthesized HKUST-1 and HP-HKUST-1 powder were also prepared, with the prepared method described in supporting information.