For studying the sorption capacity of fabricated plates

For studying the sorption capacity of fabricated plates, the sorption processes for heavy metal ion (Pb2+ and Cd2+) removal were evaluated. The results are represented in Fig. 4. While the adsorption efficiency is less over both Ag-TiO2 nanotubes/Ti and TiO2 nanotubes/Ti plates, the results showed that the deposition of MIL-88B(Fe) increased it. This better adsorption capacity of MIL-88B(Fe)-Ag/TiO2 nanotubes/Ti plate is expected because of high porosity and high surface area of MIL-88B(Fe). When MIL-88B(Fe)-Ag/TiO2 nanotubes/Ti plate is used as sorbent, in addition to the mentioned statements, heavy metal ions could be chemically sorbed by surrounding the X2+ ions with a large number of specific groups like carboxylic, hydroxides and carboxylate on the surface of MIL-88B(Fe) (As observed in the FT-IR spectrum). Based on the results, the removal of Cd2+ is higher than Pb2+ ions. The less radius size of Cd2+ compared to the Pb2+ makes it more suitable for more effective bonding with organic groups on the plate surface.