DEFINITIVE SCREENING DESIGN FOR THE OPTIMIZATION OF FLEXOGRAPHIC WATER-BASED CYAN DYE REMOVAL FROM AQUEOUS SOLUTION BY nZVI-INDUCED FENTON PROCESS

Abstract

The paper investigates the potential use of nano-zero valent iron (nZVI) particles as a cheap, natural and effective catalyst in Fenton-like process for the removal of water-based Cyan dye from synthetic aqueous solution and printing effluent. The production of nZVI nanoparticles is based on the environmentally friendly method, so-called green synthesis, using the extract from natural product, oak leaves. Characterization of oak-nZVI by SEM, EDS and TEM revealed the surface and spatial structural characteristics, as well as the morphology of the synthesized nanomaterial. The experiments were carried out in a batch mode technique, investigating the influence of dye concentration (20-180 mgL-1), nanoparticles dosage (0.75-60 mgL-1), H2O2 concentration (1-11 mM) and pH value of the solution (2-10) on the decolorization efficiency. A new generation of experimental designs, the definitive screening design (DSD), was used to optimize the process conditions, considering the individual and interaction effects of the factors that influenced the percentage of dye degradation. The optimum degradation efficiency of Cyan dye in synthetic solution was 87.24%, within the operational parameters: initial dye concentration of 20 mgL-1 , nZVI dosage of 25.69 mgL-1 , H2O2 concertation of 6.88 mM and pH value of 2. Under the optimum conditions real printing effluent was treated, and decolorization efficiency of 70.85% was achieved. The obtained experimental results show that the Fenton process is effective for the degradation of printing dye, implying to the fact that future work should be explored with additional Fenton process catalyst and for other printing dyes.

Application of advanced oxidation process for the removal of synthetic water-based printing dye and microplastics from aqueous solution

“…This confirms that the process efficiency increases with H2O2 and pH decreasing. In the study conducted by Kecić et al (2018b), Cyan dye removal with nZVI-induced Fenton process without MPs particles resulted with 87%. The obtained higher Fenton process efficiency in this experiment is probably due to the partial dye adsorption on MPs surface, indicating that the presence of MPs particles in wastewater may contribute to higher Fenton process efficiency than actually obtained.…”