Tuning the performance of a novel functionality Zn-based MOF byincorporating a secondary linker in heavy metal ions absorption

The rapid agricultural and industrial development is producing pollution of heavy metal ionsbecause of their toxicity for humans and detrimental effects on the environment and ecology[۱].Accordingly, removing heavy metal ions from water is a particularly significant issue beforethey are released into the environment. in recent years Metal-Organic Frameworks have beenregarded as remarkable candidates for the adsorptive removal of heavy metal ions because oftheir amazing attributes such as high surface areas, and designable chemical functionalization ofpore surfaces [۲].In this work, a mixed-linker MOF strategy was chosen to show proof of thisconcept in accessing more active sites and preparing some defects in MOF structures to improvethe adsorption efficiency of MOF-۵ for heavy metal ion removal from water. a novel nitrofunctionalized pyrazole dicarboxylic linker (۴-nitro-۳,۵-pyrazoledicarboxylic acid,PZDC-NO۲ )as a second ligand and benzene-۱,۴-dicarboxylate (H۲BDC) was added to form a new mixedligandMOF material (MOF-۵ (PZDC-NO۲)), under facile solvothermal synthesis, which wascharacterized by SEM, EDX, XRD, BET, and FTIR[۳].The new porous MOF was tested for theadsorption of heavy metal ions and showed an improved adsorption capacity compared to MOF-۵ and many other standard adsorbents.

کلیدواژه ها:

Metal-organic framework ، Metal ions absorption ، Mixed linker