Hydrogen chloride hcl

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.

Zinkuran SC was acquired from Arysta LifeScience Slovakia s.r.o. (Nové Zámky, Slovakia). Sodium selenate was purchased from Alfa Aesar (Karlsruhe, Germany). Nitric acid (HNO₃, for trace element analysis) was obtained from LGC Standards (Molsheim, France), and hydrogen peroxide (H₂O₂) 30% (Suprapur) was obtained from Merck/VWR (Leuven, Belgium). Methanol was purchased from Biosolve (Valkenswaard, the Netherlands). Acetone, sodium carbonate (Na₂CO₃), and sodium hydroxide (NaOH) were acquired from Merck (Darmstadt, Germany). Ascorbic acid (vitamin C), (+)-catechin, gallic acid, Folin–Ciocalteu's phenol reagent, 2,4,6-tri(2-pyridyl)-s-triazine (TPTZ), 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) diammonium salt, 2–2′-azobis (2-methylpropionamidine) dichloride (AAPH), aluminum chloride (AlCl₃), and iron(II) sulfate were obtained from Sigma–Aldrich (St. Louis, MO, USA). Hydrogen chloride (HCl) and sodium nitrite (NaNO₂) were obtained from VWR (Leuven, Belgium). Iron(III) chloride 6-hydrate was purchased from Merck (Darmstadt, Germany).