Electrolytic removal of alizarin red S by Fe/Al composite hydrogel electrode for electrocoagulation toward a new wastewater treatment

Abstract

This paper studies Fe/Al composite hydrogel electrode electrocoagulation (EC) and adsorption of alizarin red S (ARS). ARS removal efficiency and degradation mechanism when applying Fe/Al composite hydrogel electrode were investigated. The optimum experimental factors and degradation of ARS were discussed. ARS degradation was optimal operation at initial pH 3 with O.The experimental results showed that the COD removal efficiency was better, reaching to about 90 % when applying the novel electrode system. The discoloration rate also reached the best effect of 99 % in the superior technical conditions. The optimum electrolysis time is about 30 min. Results revealed that the efficiency in the EC process with Fe/Al composite hydrogel electrodes were much better than that in conventional electrode system. In addition, Fe/Al composite hydrogel electrodes are environment-friendly material, which reuse waste and reduce cost. Hydrogel has certain iron exchange capacity to eliminate the residual metal irons. It is found that the application of ultrasonic helps to accelerate the electrocoagulation of ARS. This study not only realizes the ultrasonic, flotation, coagulation, and adsorption of the combination but also gains economy and environment. Consequently, the unique performance of Fe/Al composite hydrogel electrodes opens promising perspectives for fast, high, and economical treatment of wastewater containing dyes or/and organic contaminants.

Evaluation of adsorptive and photocatalytic degradation properties ofFeWO4/polypyrrole nanocomposite for rose bengal and alizarin red S from liquid phase: Modeling of adsorption isotherms and kinetics data

“…The band at 1445 cm À1 results from the aromatic rings of the dyes. 28 Some peaks (Figure 1 2a, which is in close proximity with that reported in the literature. 29 The average crystallite sizes of FeWO 4 NPs and FeWO 4 /PPy NC are 39.12 and 142.62 nm, respectively.…”

“…The band at 1647 cm −1 is ascribed to C═O stretching mode, while the peaks at 1289, 1051, and 1015 cm −1 are attributed to symmetric and asymmetric S═O stretching vibrations of ARS. The band at 1445 cm −1 results from the aromatic rings of the dyes 28 . Some peaks (Figure 1) shift to lower frequencies after adsorption indicating the binding of RB or ARS onto the adsorbent sites through electrostatic interactions.…”

Biogenic fabrication of iron nanoadsorbents from mixed waste biomass for aqueous phase removal of alizarin red S and tartrazine: Kinetics, isotherm, and thermodynamic investigation

“…Therefore, it causes extensive damage to aquatic flora and fauna . In recent past, several techniques and materials have been applied for the sequestration of tartrazine and Alizarin red S . To the best of our knowledge, biologically produced magnetic nanoparticles have not been used so far for the removal of both the dyes.…”

“…Therefore, it causes extensive damage to aquatic flora and fauna. 30 In recent past, several techniques and materials have been applied for the sequestration of tartrazine and Alizarin red S. [31][32][33][34] To the best of our knowledge, biologically produced magnetic nanoparticles have not been used so far for the removal of both the dyes. Therefore, alizarin red S and tartrazine were selected as a model pollutant, in view to fill the scarcity of the reported data on the application of biologically produced magnetic nanoparticles for the removal of aforementioned dyes.…”

Decolorization of reactive blue 19 from aqueous solutions by electrocoagulation process

“…One of the most important of these processes is electro-coagulation, which is effectively used to remove dye from wastewater. Electro-coagulation process (EC) can greatly remove the organic compounds due to its simplicity, usability in the environment, reliability, its ability in degradation of material at large volume, adaptability, non-toxicity, and less time for treatment, compared to some chemical methods (7,8).…”