The in-situ synthesis of ZIF-8 membranes on the support of α-alumina disks was reported using a contra-diffusion method . The contra-diffusion procedure involves immersing α-alumina in a solution of zinc metal followed by immersion in a solution containing Hmim and HCOONa. The growth of ZIF-8 crystal was achieved under energy sources such as solvothermal or microwave conditions. The contra-diffusion method can be used for the defective heal membranes because they can be recycled using ligand and metal solutions . It is a cost-effective method compared to conventional synthesis methods.