Photodegradation of direct yellow-12 using UV/H2O2/Fe2+

Area of Science:

• Environmental Chemistry
• Water Treatment Technologies
• Photocatalysis

Background:

• Textile dyes like Direct Yellow-12 (DY12) pose environmental challenges due to their persistence and potential toxicity.
• Wastewater treatment requires effective methods to remove recalcitrant organic pollutants.

Purpose of the Study:

• To investigate the photodegradation of DY12 dye using an advanced oxidation process (AOP) involving UV/H(2)O(2)/Fe(2+).
• To determine the influence of various operating parameters on dye degradation efficiency and chemical oxygen demand (COD) reduction.

Main Methods:

• A photochemical reactor was used to study the degradation of DY12 dye under UV irradiation in the presence of hydrogen peroxide (H(2)O(2)) and ferrous ions (Fe(2+)).
• Experiments systematically varied parameters including dye concentration, UV intensity, pH, and reagent dosages.
• Degradation kinetics were analyzed, and final reaction products were identified.

Main Results:

• The combined UV/Fenton's reagent system significantly enhanced the degradation rate of DY12 dye compared to individual components.
• Rapid decolorization and a substantial decrease in COD were observed, indicating effective oxidation of organic pollutants.
• The degradation process followed pseudo-first-order kinetics, with acidic pH (around 4) proving most effective.
• Optimal conditions were identified as 1500/500 mg/L H(2)O(2)/Fe(2+) for 50 mg/L DY12 dye at pH 4.

Conclusions:

• The UV/H(2)O(2)/Fe(2+) AOP is a highly efficient method for treating DY12 dye wastewater.
• The process effectively removes color and reduces COD, offering a viable solution for textile effluent management.
• Understanding the influence of operating parameters allows for optimization of the treatment process.