The use of bimetallic Fe–Ni MOF as a promising nano-adsorbent in the removal of brilliant green dye from aqueous solution and multi-agent systems of brilliant green dye and ink effluent from flexographic printing
摘要
The Fe–Ni MOF was synthesized using the solvothermal method, and its efficiency for removing brilliant green dye (BG) from aqueous solution and a multi-agent system of brilliant green dye/flexo-printing ink effluent was examined. Characteristics of the Fe–Ni MOF adsorbent before and after dye adsorption were studied and verified using PXRD, FTIR, FESEM, EDS, BET, VSM, TGA, and zeta potential. The results show that there are a pseudo-second-order kinetic model and a Langmuir isotherm. Based on the BET technique, Fe–Ni MOF adsorption has a high surface area of 403 m2 g−1. The highest achieved adsorption capacity was 448 mg g−1, which was attributed to its high porosity and proper pore size. Also, there was a considerable effect on COD removal of BG dye solution, raw effluent, and BG/effluent multi-agent systems at 73.96%, 59.45%, and 40.57%, respectively. The high COD of the effluent caused the adsorption capacity to drop from 448 to 84.4 mg g−1, and it was shown that the presence of bothersome species changes the adsorption isotherm from Langmuir to Freundlich. The Fe–Ni MOF zeta potential values (− 18.9 mV) suggest the particles with a negative surface charge are likely to react significantly with cationic compounds.