Constant current-exponential attenuation mode: A non-traditional power supply mode for electrocatalytic oxidation

Area of Science:

• Environmental Science
• Electrochemistry
• Chemical Engineering

Background:

• Electrocatalytic oxidation (ECO) technology faces challenges with low average current efficiency (ACE) and high energy consumption (EC).
• Optimizing power supply modes is crucial for improving the industrial viability of ECO.

Purpose of the Study:

• To introduce and evaluate a novel "constant current-exponential attenuation" (Mode CC-EA) power supply mode for electrocatalytic oxidation systems.
• To enhance electrical energy utilization, increase pollutant degradation rates, and reduce energy consumption in wastewater treatment.

Main Methods:

• A "constant current-exponential attenuation" (Mode CC-EA) power supply mode was developed and applied to intermittent ECO systems.
• Comparative analysis of Mode CC-EA against traditional constant current (Mode CC) and direct exponential attenuation (Mode EA) modes using Acidic Red G (ARG) as a model pollutant.
• Optimization of Mode CC-EA parameters and testing on diverse dye wastewaters (CV, MB, MO).

Main Results:

• Mode CC-EA demonstrated significantly higher ACE (up to 1.45 times) and lower EC (up to 34.2% reduction) compared to Mode CC for ARG degradation.
• Optimized Mode CC-EA achieved superior decolorization, Chemical Oxygen Demand (COD), and Total Organic Carbon (TOC) removal rates for multiple dye wastewaters within the same total charge input.
• On average, Mode CC-EA showed 1.3 times higher ACE and 25.3% lower EC than Mode CC across tested dye wastewaters.

Conclusions:

• The proposed Mode CC-EA effectively enhances electrical energy efficiency and catalytic performance in ECO processes.
• Mode CC-EA offers a promising solution for the efficient treatment of dye wastewater, supporting the industrial development of ECO technology.