<p>The development of green and multipurpose adsorbents for concurrent adsorption of contaminates from waste water is of great interest. Metal-organic frameworks (MOFs) as adsorbents open new insights for researchers as multipurpose adsorbents. Herein, we investigate green synthesis of a novel water-based synthesize of a new 3D Zn-based MOF (<b>CFU-2</b>) {[H₂en][Zn(BTEC)]}_n (H₂en is ethylene diammonium cation and BTEC is benzene-1,2,4,5-tetracarboxylate anion). Traditional synthesizing methods for MOFs are energy consuming, therefore improving novel green methods for MOF fabricating is essential. Addressing this gap we introduced ethylene diammonium cation into structure which improves the solubility of the linker leading to the formation of a porous structure through a slow evaporation method using cold water as solvent. The structure was completely analyzed through single crystal X-ray crystallography, PXRD, FT-IR, TGA, BET and SEM methods. The chromate and Lead(II) removal efficiency of <b>CFU-2</b> was thoroughly explored from waste water through ICP and UV-visible analysis. The influence of the primary concentration of the substrate, MOF amount and pH in the removal procedure were also examined empirically. The maximum adsorption concentration of <b>CFU-2</b> can reach up to 67.5 and 570 mg.g^-1 for Cr(VI) and Pb(II) ions, respectively. The adsorption mechanism and uptake kinetic and thermodynamic of the framework toward chromate and Lead(II) was also studied. <b>CFU-2</b> was successfully recycled at least four times from water without reduction in its adsorption capacity and crystallinity. It seems that <b>CFU-2</b> could be used as green and multipurpose adsorbents for hazardous metals specifically from waste waters.</p>