Dear Shadab Saifi please see this potentially useful article entitled "Crystal Growth of ZIF-8, ZIF-67 and their Mixed Metal Derivatives". The paper is available as public full text on RG:
Article Crystal Growth of ZIF-8, ZIF-67 and their Mixed Metal Derivatives
Also please find attached an article entitled "Double layer MOFs M-ZIF-8@ZIF-67: The adsorption capacity and removal mechanism of fipronil and its metabolites from environmental water and cucumber samples" which might help answering your question.