Oxidation of Crystal Violet in Aqueous Solutions Using the Fenton Process

Advanced oxidation processes (AOPs) are always accompanied by producing highly-reactive hydroxyl radicals (OH) with great potentialfor the decolorization and mineralization of organic compounds. Todays, dyestuff and pigments are considered a notoriousconcern for the pollution of aqueous environments. Proposing new methods to dispose of this problem is therefore essential. Thepresent study was conducted to investigate the use of the Fenton process for removing crystal violet (CV) from aqueous solutions.The effectiveness of this method was influenced by several factors, including pH, initial concentration of the dye, different interferingions and reaction duration. The residual concentration of the dye was determined using spectrophotometry at a maximumwavelength of about ۵۸۶ nm. The data were analyzed and interpreted in Excel. The optimalpHwas obtained as ۳, and the optimal initialconcentration and Fe/H۲O۲ ratio as ۵۰ mg/L and ۱:۱۰ respectively. Given the effect of the contact duration, the minimum Fentonreaction duration was considered ۳۰ minutes. In next step the effect of interference in the progression of the Fenton process wereinvestigated for KCl, NaCl and NaHCO۳. Moreover, the efficiency of CV decolorization was ۹۶% under optimal conditions. Fenton canbe therefore considered an appropriate process for removing CV from colored wastewater in textile industries.

Keywords:

ColoredWastewater , Fenton Process , CV