The well-intergrown ZIF crystals are required to obtain high pore continuity, i.e., good interconnectivity in membranes. The homogenous growth of ZIFs layers into the substrate can be promoted using deprotonation. A base such as triethylamine (TEA), sodium formate (HCOONa), ammonium hydroxide (NH4OH), or sodium hydroxide (NaOH) can be used to deprotonate the organic linker and promotes crystal growth . Thus, the ZIFs crystals can be grown in all substrate directions. The base can also play a dual role; deprotonation and the formation of a sacrificial template via conversion of Zn salts into ZnO. It was also reported that Hmim exhibits a higher degree of deprotonation in water than in organic solvents . Besides the base, polymers such as polyethyleneimine (PEI) were also reported for ZIF7-based membranes . The functional groups of PEI promote the linkage between the seeds and the support. PEI can also deprotonate the organic ligand .The adsorption using ZIF-67 can be improved via the in-situ growth of the adsorbent inside hollow carbon nanospheres (ZIF-67@HCSs) . The CO2 adsorption capacities of ZIF-67@HCS-40, ZIF-67@HCS-50, and ZIF-67@HCS-60 were 4.6 mmol/g, 3.9 mmol/g, and 3.0 mmol/g, respectively at 273K .