Highly effective removal of Pb2+ from wastewater by nickel-based metal organic framework

Here, the thermodynamics and kinetics of Pb 2+ adsorption and removal on Ni-MOF-74 from wastewater were studied. The effects of pH value, contact time, Pb 2+ initial concentration, Na + concentration, Ni-MOF-74 loading and adsorption temperature were systematically studied. The results showed a good Pb 2+ adsorption capacity of the MOF. The adsorption of Pb 2+ was analyzed by using different isotherms as well as different kinetics models. The results showed that Tempkin adsorption isotherm and pseudo-2 nd -order kinetics were followed by the adsorption of Pb 2+ on Ni-MOF-74. Thermodynamic studies (ΔG<0, ΔH<0) showed that the adsorption process is exothermic and spontaneous. The results revealed that Ni-MOF-74 has a real prospect for the application in the adsorption and removal of Pb 2+ . Ni-MOF-74 was synthesized by hydrothermal method and exhibited excellent adsorption performance for heavy metal ion Pb 2+ from wastewater. It is a promising adsorbent for removing heavy metal ion Pb 2+ from wastewater. • Ni-MOF-74 is a promising adsorbent for removing of heavy metal ion Pb 2+ from wastewater. • Pb 2+ is mainly removed from wastewater through chemisorptions by using the Ni-MOF-74 as adsorbent. • The high adsorption capacity of Pb 2+ on Ni-MOF-74 is related to the rich hydroxyl groups in Ni-MOF-74. • The adsorption of Pb 2+ on Ni-MOF-74 is a spontaneous exothermic process.