Abstract
In this work, a novel adsorption material (Fe-MOF) had been designed and synthesized by introducing sulfate ions into a framework with an environmentally friendly metal center (Fe(Ⅲ)). It can specifically remove Pb(Ⅱ) and NO3- ions in industrial wastewater. The structure and properties were characterized, and the existence of sulfate ions and the exposure of oxygen atoms were confirmed. The adsorption kinetics, isotherm and thermodynamics experiments had been carried out to study the adsorption properties. The experimental results showed that Fe-MOF had high selectivity for Pb(Ⅱ) ions, and its maximum adsorption capacity was as high as 504 mg/g. Remarkably, it could also adsorb NO3- ions, an equilibrium charge, by proton co-adsorption with maximum adsorption capacity of 304 mg/g. In addition, industrial wastewater was simulated, and the study showed that the presence of coexisting ions had little interference on the adsorption performance Cyclic experiments suggested Fe-MOF had an excellent adsorption-desorption circulation ability. The adsorption mechanism study confirmed that sulfate ions as the adsorption site improved its selectivity. These results provided a feasible method for the preparation of environmentally friendly MOFs adsorbents, and demonstrated the outstanding potential of sulfate functionalized MOFs in the treatment of industrial wastewater.
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