The XRD pattern of ZIF-67 resembles with reported patterns [23]. The diffraction peaks located at 2θ = 11.4, 24.3, 42.7, 53.1, 59.5 and 62.1° corresponds to (003), (006), (002), (018), (110) and (111) planes of CoCu-LDH matched with JCPDS card no (84–0599) and (74–...