Electrochemical degradation of Reactive Black 5 using PbO2and graphite carbon nitride modified steel electrodes

Abstract

Elektrode modifikovane kompozitom PbO2 sa grafitnim ugljen-nitridom (GCN) upotrebljene su za elekrohemijsku degradaciju tekstilne boje Reactive Black 5. Modifikovana čelična elektroda je korišćena kao anoda, a kao katoda čista čelična elektroda. Ispitan je uticaj strukture PbO2 na elektrokatalitičke karakteristike elektroda. Morfologija materijala je ispitana SEM-om, TEM-om i XRD-om, dok su elektrohemijske osobine ispitane uz pomoć CV i EIS merenja. Efikasnost degradacije je praćena UV-Vis spektrofotometrijom i tečnom hromatografijom. Pri optimalnim parametrima pH, koncentracije pomoćnog elektrolita, jačine struje i koncentracije ispitivane boje, najbolji rezultati su dobijeni sa elektrodom gde je cetiltrimetilamonijum-bromid (CTAB) korišćen kao templat za sintezu PbO2. Pod ovim uslovima je postignuta potpuna degradacija nakon 60 min tretmana, a proizvodi degradacije su određeni korišćenjem HPLC-MS/MS metode.

Electrodes modified by PbO2 and graphite carbon nitride (GCN) composite were used for electrochemical degradation of Reactive Black 5 textile dye. A modified steel electrode was used as the anode, while a pure steel electrode was used as the cathode. The influence of PbO2 structre on electrocatalytic characteristics of electrodes was investigated. The morphology of the material was examined by SEM, TEM and XRD, while the electrochemical properties were analyzed using means of CV and EIS measurements. The degradation efficiency was monitored by UV-Vis spectrophotometry and liquid chromatography. At optimal pH parameters, supporting electrolyte concentration, current strength and test dye concentration, the best results were obtained with an electrode where cetyl trimethyl ammonium bromide (CTAB) was used as a template for PbO2 synthesis. Under these conditions, complete degradation was achieved after 60 min of treatment, and degradation products were determined using the HPLC-MS/MS method.