Lotfi Sellaoui, Felycia Edi-Soetaredjo, Mbarek Mohamed, Suryadi Ismadji, Barbara Ernst, Adrian Bonilla-Petriciolet, Abdelmottaleb Ben Lamine, David Dell'Angelo, Micheal Badawi
The paper analyzes the single and binary adsorption of textile water pollutants, namely Direct Blue 1 (DB-1) and Direct Yellow-4 (DY-4) dyes, on HKUST-1 at 30 – 50 °C and pH 6.8. Experimental adsorption data indicated that the DB-1 and DY-4 adsorption capacities using this MOF decreased from single to binary systems confirming the presence of a competition effect between these dye molecules on the HKUST-1 adsorbent site. This antagonistic adsorption effect was exothermic. A theoretical approach based on the application of two enhanced adsorption models was utilized to understand the mechanisms for the adsorption of both dye molecules. This approach allowed the calculation of the saturation adsorption capacities for these pollutants in single and binary systems, which followed the next sequence: Qm (DB-1/HKUST-1) > Qm (DY-4/HKUST-1) and Qmb (DB-1 (DB-1 + DY-4)/HKUST-1) > Qmb (DY-4 (DB-1 + DY-4)/HKUST-1). The binary adsorption of these dyes occurred via the presence of an antagonistic effect that reduced the MOF removal performance. HKUST-1 showed better adsorption performance to remove DB-1 dye. The adsorption orientations of DB-1 and DY-4 on HKUST-1 surface were discussed at different temperatures. The models determined the adsorption energies describing the interactions between both dyes and HKUST-1 surface, with range values from 17 to 21 kJ/mol, 12 to 16.5 kJ/mol in single and binary systems respectively. These calculations indicated that physical interactions may trigger the removal of these water pollutants. Overall, this work reports a cutting-edge application of HKUST-1 as adsorbent to remove toxic pollutants such as dye molecules from water. © 2023 Elsevier B.V.
CRMN, Centre for Research on Microelectronics and Nanotechnology of Sousse, NANOMISENE, LR16CRMN01, Code Postal 4054, Sousse, Tunisia; Laboratory of Quantum and Statistical Physics, LR18ES18, Monastir University, Faculty of Sciences of Monastir, Tunisia; Department of Chemical Engineering, Widya Mandala Surabaya Catholic University, Kalijudan 37, Surabaya, 60114, Indonesia; Collaborative Research Center for Zero Waste and Sustainability, Jl. Kalijudan 37, East Java, Surabaya, 60114, Indonesia; Research Laboratory: Assymetric Synthesis and Molecular Engineering of Materials for Organic Electronic (LR18ES19), Monastir University, Tunisia; Université de Strasbourg, CNRS, IPHC UMR 7178, Laboratoire de Reconnaissance et Procédés de Séparation Moléculaire (RePSeM), ECPM 25 rue Becquerel, Strasbourg, F-67000, France; Instituto Tecnológico de Aguascalientes, Aguascalientes, 20256, Mexico; Université de Lorraine, CNRS, Laboratoire Lorrain de Chimie Moléculaire, Metz, F-57000, France