Removal of Chromium (VI) from Aqueous Solution Using Electro-Fenton Process

Abstract

Chromium (Cr) is considered to be mutagenic and carcinogenic, and is one of the most important pollutants that have been widely used in various industrial applications. Due to its adverse health impacts, Cr must be removed from effluents before being released into the water environments. The objective of the present study was to investigate the effect of electroFenton process (EFP) using iron electrodes in presence of sodium sulfate salt on the elimination of Cr(VI) from aqueous solution. The effect of various parameters such as pH, voltage, initial Cr(VI) concentration, hydrogen peroxide dosage and cyanide concentration (as interference ion), on the process efficiency of Cr(VI) removal have also been tested. The results indicate that the optimum pH, voltage and hydrogen peroxide dosage in EFP were determined to be 3, 30 V and 50 mL/L, respectively. The results of this research also demonstrated that EFP efficiency decreased with increasing initial Cr(VI) concentration. Moreover, EFP efficiency Cr(VI) removal decreased with increasing cyanide concentration; accordingly, the cyanide acts as interference ion in EFP and can reduce the removal efficiency of Cr(VI). According to the obtained results, the maximum removal efficiency of Cr(VI) at optimum condition was 97 % after 25 min. These findings suggest that EFP is suitable option for removing Cr(VI) from aqueous solution.

Kinetics and Equilibrium Studies of the Adsorption of Copper(II) Ions from Industrial Wastewater Using Activated Carbons Derived from Sugarcane Bagasse

“…Ions. Adsorption equilibrium isotherm models describe how much of the adsorbate is adsorbed onto the adsorbent [84,85]. e phenomenon is usually a function of the concentration of the adsorbates in an aqueous phase or pressure of the adsorbate in a gaseous phase at a constant temperature.…”

Optimization of adsorption of Cr(VI) from aqueous solution by Leucaena leucocephala seed shell activated carbon using design of experiment

“…The most commonly used techniques for removing chromium from water/wastewater include chemical precipitation, ion exchange, electrocoagulation, reverse osmosis, membrane separation, electro-Fenton process, nanofiltration and adsorption (Matlock et al 2001;Inglezakis et al 2007;Nurbas Nourbakhsh et al 2002;Rahmani et al 2015;Mnif et al 2017;Gorzin and Abadi 2017). Among these methods, adsorption is found to be effective, eco-friendly, less expensive and simple.…”

Adsorption of Phenol from Aqueous Solution Using Lantana camara, Forest Waste: Packed Bed Studies and Prediction of Breakthrough Curves

“…The wastewater released from the chemical industries contains various pollutants like phenol, dyes, organic matter, heavy metals and suspended matter (Reza Rahmani et al 2015). Among them, phenol is one of the crucial pollutants present in wastewater released at noticeable levels.…”