Controllable Preparation of Cu-MOF-Coated Carboxyl Filter Paper for Simultaneous Removal of Organic Dye and Metal Ions

A composite paper was designed in order to remove dyes and heavy metal ions in wastewater, which was prepared by assembling NH2-Cu-BDC layer by layer on the surface of the carboxymethyl-modified filter paper (CMFP). The prepared composite paper (Cu-MOFs/CMFP) shows the ability to capture dyes and metal ions, and the dye and metal solution can be separated by simple filtration on the MOF paper at the same time. The application of 30-layer Cu-MOFs/CMFP in the removal of pollutants in simulated wastewater was discussed, and it was found that Cu-MOFs/CMFP can simultaneously remove dyes and heavy metal ions with removal rates close to 90%. In addition, Cu-MOFs/CMFP can be reused after a simple washing process and maintains prosperous dye capture ability. The successful development of this technique provides a new strategy to design new materials for the removal of organic dyes and heavy metal ions in wastewater.