Droplet-impingement, flow-assisted electro-fenton purification using heterogeneous silica/iron nanocomposite catalyst

[0081]CHEMICAL AND MATERIALS: All chemicals described herein were of analytical grade quality and were used as received without further purification. Acebutolol hydrochloride (ACE, at least 98% pure) and propranolol hydrochloride (PROP, at least 99% pure) were purchased from Sigma-Aldrich (Deisenhofen, Germany). Ferric nitrate, Fe(NO3)3.9H2 (98.5%), cetyltrimethylammonium bromide (CTAB), nitric acid, sodium hydroxide, sulfuric acid, hydrochloric acid, acetone, sodium chloride, and glycerol were purchased from Sigma-Aldrich (St. Louis, USA). Acetonitrile, formic acid, and methanol (LC-MS grade) were purchased from Fisher Scientific (Schwerte, Germany). In all experiments, a 0.05 M Na2SO4 solution was used as a supporting electrolyte. An Si / BDD electrode with 2.75 μm BDD thin layer thickness (both sides) deposited on a conductive Si sheet, was purchased from NeoCoat (Switzerland). A graphite felt electrode (GFE) based on 5 mm thick PAN was purchased from Shanghai Qijie Limited Co. (Chi