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Luka Suhadolnik,Andrej Pohar,Uroš Novak,Blaž Likozar,Aleš Miheli9c,Miran Ceh 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
Reactive Red 106, a synthetic azo dye, was degraded by means of photocatalysis, electrocatalysis andphoto-electrocatalysis with an immobilized titanium dioxide nanotube catalyst. The plannedfirst part ofthe experiments was carried out inside a photo-electrocatalytic continuous-flow microreactor unit,which was used for the evaluation of the effective decomposition mechanisms, the assessment of theinvestigated degradation kinetics and the transport. The processes were described with a convection–diffusion–reaction mathematical model. Full degradation was achieved under photo-electrocatalyticoperation. The second half of the tests was executed inside a batch-vessel system, consisting of twoseparate compartments. In the anode device partition, an electrode, made of a nanometer-scaled TiO2tubefilm, was placed, whereas a Ti foil was positioned in the cathode’s electrical section. The separationof the electrolytes made it possible to analyze the conversion individually, monitoring the disintegrationof the textile pigment compound in each structural component separately, and studying the changingenvironmental phenomena for either the polarized positive or negative function. Water-based producedchemicals were determined with ultra-high-performance liquid chromatography (UHPLC), coupled withultraviolet–visible (UV–vis) or mass (MS) spectroscopy detectors. The solution was successfullydiscolored (100%) either under engineered microfluidic operation or inside a beaker’s enclosed volume. However, the rate inside the latter was faster, while there were unlike intermediate species formed ineither the anodic or cathodic electrochemical cell. The maximum conversion achieved on the anode sidewas 80% of the initial concentration of the dye, whereas 63% of the dye was degraded on the cathode side. Finally, a scaled-up input configuration was designed for treating larger feedstock capacities.
Luka Suhadolnik,Matic Krivec,Kristina Žagar,Goran Dražic,Miran Ceh 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
A continuous-flow, coil-type photoelectrocatalytic microreactor for the degradation of caffeine wasdesigned, assembled and characterized. Its main components are the photocatalytically active anode andthe cathode coils, which are wrapped around a silica-glass rod and placed into a UV-transparent housing. The anode coil was prepared by anodic oxidation of the titanium coil, which leads to the formation ofvertically aligned, titanium dioxide, nanotube arrays that exhibit a high photocatalytic activity and arerigidly attached to the titanium wire. The photocatalytic, electrocatalytic and photoelectrocatalyticactivities of the assembled microreactor were measured systematically while changing the mainparameters that affect the device’s efficiency. The most significant change in the microreactor’s design interms of efficiency was to place the cathode coils on both sides of the anode coil, which resulted in theshortest time for complete degradation of the caffeine. When an applied anodic bias potential of 4 V wasused in the most efficient microreactor design, 1 mL of the 40 mg/L caffeine was fully decomposed in55 min.