Ibuprofen degradation and toxicity evolution during Fe2+/Oxone/UV process
Han Gong1, Wei Chu1, So Hiu Lam1
1Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
The Fe2+/Oxone/UV (FOU) process effectively degrades ibuprofen in water. Optimizing reactant dosages and introduction methods enhances the removal of toxic byproducts, ensuring a comprehensive treatment solution.
Area of Science:
- Environmental Chemistry
- Advanced Oxidation Processes
- Water Treatment Technologies
Background:
- Ibuprofen is a common pharmaceutical pollutant in aquatic environments.
- Conventional water treatment methods are often insufficient for complete pharmaceutical removal.
- Advanced Oxidation Processes (AOPs) show promise for degrading persistent organic pollutants.
Purpose of the Study:
- To investigate the degradation of ibuprofen in aqueous solution using the Fe2+/Oxone/UV (FOU) process.
- To elucidate the roles of Fe2+, Oxone, and UV irradiation in ibuprofen removal.
- To optimize FOU process conditions for efficient ibuprofen degradation, mineralization, and toxicity reduction.
Main Methods:
- Comparative study of Fe2+/Oxone (FO), Fe2+/UV (FU), and Oxone/UV (OU) processes.
- Systematic investigation of parameters including UV wavelength, Fe2+ and Oxone dosage, initial ibuprofen concentration, pH, and interfering anions.
- Analysis of mineralization efficiency (TOC removal) and toxicity evolution of treated water.
Main Results:
- The FOU process demonstrated superior ibuprofen degradation efficiency compared to FO, FU, and OU.
- Optimal conditions for 97% ibuprofen removal (0.05 mM) in 10 min were identified: 300 nm wavelength, 0.25 mM Fe2+, 0.25 mM Oxone, and pH 3.68.
- Initial optimal conditions for ibuprofen degradation were insufficient for complete TOC and toxicity removal due to toxic intermediate accumulation.
Conclusions:
- The FOU process is highly effective for rapid ibuprofen degradation.
- A modified FOU approach with stepwise introduction of Fe2+ and Oxone, and an adjusted molar ratio ([IBP]0:[Fe2+]0:[Oxone]0 = 1:25:25), is necessary for complete mineralization and toxicity elimination.
- This optimized FOU strategy offers a comprehensive and safe water treatment solution for pharmaceutical pollutants.
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