Application of novel Zn-MIL53(Fe) for removal of micropollutants using an activated peroxymonosulphate system
Daniel Terrón, J.P. Holgado-Vázquez, A. Giráldez, Emílio Rosales, M.Á. Sanromán, Marta Pazos
Abstract
Novel zinc-doped Metal-Organic Framework based on MIL53(Fe) (Zn-MIL53(Fe)) has been successfully synthesised in one-step, exhibiting dual applications as adsorbent and catalyst. Initially, the adsorption capacity of MIL53(Fe) and Zn-MIL53(Fe) for removing Rhodamine B was assessed through kinetic and isotherm studies. The bimetallic variant exhibited superior performance, showcasing enhanced adsorption capabilities, particularly in the context of its physical interaction under natural pH. After that, the catalytic activity of both synthesised materials was evaluated to generate sulphate radicals by activating PeroxyMonoSulphate (PMS). It was also demonstrated that Zn-MIL53(Fe) exhibited the best catalytic activity being optimised using response surface methodology for Rhodamine B degradation (0.11 mM PMS and 43.2 mg Zn-MIL53(Fe)). Under optimal conditions, favourable outcomes were attained, facilitating the degradation of Rhodamine B, Fluoxetine, and Sulfamethoxazole by 93, 99, and 75%, respectively. Furthermore, the operational stability of the Zn-MIL53(Fe) was verified, as it remains structurally and catalytically intact after different cycles.