The overabundance of metals weighed in many industrial processes creates serious health problems and risks for humans and other forms of life through bioaccumulation along the food chains. There are many sources of exposure to toxic heavy metals, for example, paints, enamels, jewelry, toys and tubes. In this work, we describe a new metal-organic network of Copper (II) and BTC (benzene-1,3,5-tricarboxylate), stable in water, synthesized by the solvothermal method and modified with graphene HKUST-1@GO as an efficient adsorbent Lead (II) in water. The metal-organic structure obtained was confirmed by X-ray diffraction, where strong peaks of diffraction are shown, indicating the high porosity and crystallinity of the compound. By the method of infrared spectroscopy and Raman spectroscopy, it was possible to determine the presence of the functional groups characteristic of the ligand and graphene. The size and morphology of the structures were observed using SEM, and the average particle diameter varied between 0.8 - 1μm. According to the weight losses in the TGA analysis curves, it is observed that the structure has good thermal stability. Finally, using the ICP-OES technique to determine the removal percentage, solutions of 5 mg/L of Pb2+ and 10 mg of compound at pH: 5 were used for 5 hours, resulting in a 93% remediation of the metal.

Uso de redes metalorgânicas (MOF's) como um eficiente adsorvente de chumbo na água