Combined Fenton-MF process increases acrylonitrile removal.

Area of Science:

• Environmental Chemistry
• Water Treatment Technologies

Background:

• Fenton oxidation combines oxidation and coagulation, with Fenton's reagent also initiating polymerization.
• Acrylonitrile (AN) is a key raw material in ABS resin manufacturing.
• Combined Fenton-microfiltration (Fenton-MF) offers a novel approach for pollutant removal.

Purpose of the Study:

• To investigate the application of the Fenton-microfiltration process for removing acrylonitrile (AN).
• To determine the optimal conditions for AN removal using Fenton oxidation.
• To analyze the byproducts formed during the Fenton oxidation of AN.

Main Methods:

• Fenton oxidation experiments were conducted across a pH range of 2 to 4.
• Varying dosages of ferrous sulfate ([FeSO4]0) and hydrogen peroxide ([H2O2]0) were tested.
• The combined Fenton-MF process was evaluated, considering operational modes.

Main Results:

• AN removal efficiency increased with pH from 2 to 4.
• Higher reagent dosages ([FeSO4]0/[H2O2]0) resulted in increased AN removal.
• Acrylic acid and acrylamide were identified in the solution post-oxidation, while acrylamide, polyacrylamide, and polyacrylic acid were found in the precipitate.
• The operational mode significantly impacted the combined Fenton-MF process performance.

Conclusions:

• The Fenton-microfiltration process is effective for acrylonitrile removal.
• Optimizing pH, reagent dosage, and operational mode is crucial for efficient AN removal.
• The process facilitates the separation of AN and its polymeric byproducts.