Application of a novel definitive screening design to decolorization of an azo dye on boron-doped diamond electrodes

Abstract

The electrochemical decolorization of the Reactive Violet 5 azo dye on a boron-doped diamond anode was used as a model process to test a novel definitive screening design (DSD). This method allows a dramatic reduction in the number of experiments needed to investigate those systems characterized by a large number of variables. In this study, the effect of nine quantitative parameters was investigated: initial dye concentration (60-120 mg L -1 ), current density (100-500 A m -2 ), NaCl concentration (5-20 mM), Na 2 SO 4 concentration (35-65 mM), pH (3-11), temperature (20-45°C), interelectrode distance (0.5-3.5 cm), stirring rate (250-750 rpm) and electrolysis time (2-8 min). Analysis of DSD data showed that four out of the nine factors (initial dye concentration, current density, pH and electrolysis time) were statistically significant. These factors were retained for process characterization using a subsequent central composite design. Overall, the number of experiments was reduced from over 500 to only 41, thus confirming the validity of the proposed approach as a timesaving and efficient method.

Photocatalytic Degradation of Azo Dye Reactive Violet 5 on Fe-Doped Titania Catalysts under Visible Light Irradiation

“…However, its complex aromatic structure ( Figure 1) makes it highly resistant to degradation. A literature survey showed that very few studies have been performed on RV5 degradation and none of them investigated the photocatalytic removal of the dye under visible light [27][28][29][30][31][32]. Accordingly, a first aim of this study was to evaluate whether the use of the selected photocatalyst in the presence of visible light could be a suitable method to degrade RV5.…”

Characteristics of gluten-free bread: quality improvement by the addition of starches/hydrocolloids and their combinations using a definitive screening design

“…During the analysis of factors, screening designs must be used to select the parameters that affect the response significantly; however, such parameters are limited and generally need a more detailed study to understand the effects of interaction between such factors [23]. Therefore, a new design called definitive screening design (DSD) with three levels has been proposed by Jones and Nachtsheim [24], which allows screening of factors to obtain information that can clarify details about their effects.…”

Photoassisted Electrochemical Treatment of Azo and Phtalocyanine Reactive Dyes in the Presence of Surfactants

“…Previous literature also reported that in the presence of chlorides, the electrochemical process produces a mixture of chlorine oxidants with high selectivity toward the chromophore group, thus accelerating the color removal rate prior to mineralization [31,32]. …”