Materials
Zinc nitrate hexahydrate (Zn
(NO3)2·6H2O, 99.99%),
2-methylimidazole
(Hmim, 98%), and Tetraethyl orthosilicate (TEOS, 98%) were supplied by
Shanghai Aladdin Industrial Corporation China. PVDF porous support
membrane was prepared using the nonsolvent-induced phase separation
(NIPS) method. Dibutyltin dilaurate (DBTDL, ≥96%) was supplied by
Tianjin Guangfu Fine Chemical Research Institute China.
Hydroxyl-terminated PDMS (viscosity, 50000 mPa s) was purchased from
Beijing Chemical Works China. Methanol of analytical grade was purchased
from Beijing Tongguang Fine Chemical Company China. Butadiene and
nitrogen pure gases (99.999%) were supplied by Shanxi Hongwei Gas
Company China. All reagents were used as received without any further
purification.