Porous α-Al2O3 disks (h = 1 mm, d = 13 mm, ɛ = 0.4–0.55; Fraunhofer IKTS) were used as substrate. These are special composite microfiltration membranes, consisting of a smooth layer of α-Al2O3 (d50 = 70 nm) on the top of an α-Al2O3 support (d50 = 2.5 μm).
Organic linker and metal ion sources were obtained from Alfa Aesar (Kandel, Germany) as 2-aminoterephthalic acid, C8H7NO4 (99%), and zirconium(IV) chloride, ZrCl4 (99.5%), respectively. For the functionalization, an 11-mercapto-1-undecanol (MUD) solution was purchased from Sigma-Aldrich (Darmstadt, Germany). The used solvents were hydrogen chloride (HCl), provided by VWR Chemicals (Radnor, PA, USA), and N,N-Dimethylformamide (DMF), supplied by Merck (Darmstadt, Germany). DMF was employed not only as a solvent for both linker and metal ion compounds but also for washing the synthesized samples. All chemicals and reagents were used as received without further purification.
Organic linker and metal ion sources were obtained from Alfa Aesar (Kandel, Germany) as 2-aminoterephthalic acid, C8H7NO4 (99%), and zirconium(IV) chloride, ZrCl4 (99.5%), respectively. For the functionalization, an 11-mercapto-1-undecanol (MUD) solution was purchased from Sigma-Aldrich (Darmstadt, Germany). The used solvents were hydrogen chloride (HCl), provided by VWR Chemicals (Radnor, PA, USA), and N,N-Dimethylformamide (DMF), supplied by Merck (Darmstadt, Germany). DMF was employed not only as a solvent for both linker and metal ion compounds but also for washing the synthesized samples. All chemicals and reagents were used as received without further purification.