Chromium Ions Removal by Capacitive Deionization Process – Optimization of the Operating Parameters with Response Surface Methodology

Abstract

An innovative desalination method called electrosorption or capacitive deionization (CDI) has significant benefits for wastewater treatment. This process is performed by using a carbon fiber electrode as a working electrode to remove hexavalent chromium ions from an aqueous solution. The pH, NaCl concentration, and cell voltage were optimized using the Box-Behnken experimental design (BDD) in response surface methodology (RSM) to study the effects and interactions of selected variables. To attain the relationship between the process variables and chromium removal, the experimental data were subjected to an analysis of variance and fitted with a quadratic model. The optimum conditions to remove Cr(VI) ions were: pH of 2, a cell voltage of 4.3V, and NaCl concentration of 1.4 g/L. This study demonstrated that the carbon fiber electrode was very efficient in Cr(VI) ions removal and the BBD methodology was a practical and effective strategy for predicting the results of various experimental conditions during a CDI process for the removal of chromium ions.

Electrosorption of Hexavalent Chromium Ions by MnO2/Carbon Fiber Composite Electrode: Analysis and Optimization of the Process by Box-Behnken Design

“…MnO2/carbon fiber electrode could accelerate the electrosorption process to complete in 3 h according to its faradic-capacitive behavior. While due to the capacitive behavior of carbon fiber electrode, the electrosorption process require 4 h to reach the equilibrium time, that result has been achieved in our previous study [37]. 2 displays the actual values achieved from the experimental work as well as the predicted values measured using RSM methods, which illustrate the electroporation process's response to the chromium ion removal efficiency [38].…”

Electrodeposition of Manganese Dioxide under Different Conditions: Application of MnO2/Carbon Fibers in the Electrosorption Process

“…Currently, very few papers have investigated the removal of heavy metals by electrosorption onto a MnO 2 /CF electrode [23], and no previous study investigated the application of this electrode for chromium ion removal by electrosorption. This work is complementary to our previous study [24] to investigate the difference in performance between a pure CF electrode and an MnO 2 /CF electrode when employed as a working electrode in the process of Cr(VI) ion electrosorption, in which the electrosorption of Cr(VI) ions was performed by using a pure CF electrode as the working electrode. The present study aimed to examine the best conditions for preparing the MnO 2 /CF electrode and employing it as the main electrode for adsorbing Cr(VI) ions electrochemically from an aqueous solution, and for detecting the best conditions for this goal.…”

Modification of Electro-Fenton Process with Granular Activated Carbon for Phenol Degradation – Optimization by Response Surface Methodology

“…MS). A P-value and F-value of (0.001) and (25.94) were found, indicating that the regression model is very significant [Issa and Salman, 2023]. The model's multiple correlation coefficient can be used to predict the effectiveness of phenol removal in the…”