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Selective Separation Catalysis Membrane for Highly Efficient Water and Soil Decontamination via a Persulfate-Based
Zhen Qiu1,2, Xin Xiao3, Wentao Yu1,2
1Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China.
Environmental Science & Technology
|February 18, 2022
Summary
A novel selective separation catalysis membrane (SSCM) enhances organic pollutant removal using persulfate. This membrane reduces oxidant and catalyst use, prevents secondary pollution, and improves efficiency in water treatment.
Area of Science:
- Environmental Chemistry
- Materials Science
- Chemical Engineering
Background:
- Sulfate radical advanced oxidation is effective for organic pollutant removal but faces challenges like catalyst recycling, low oxidant efficiency, and secondary pollution.
- Existing methods struggle with catalyst recovery, high oxidant demand, and environmental issues such as soil acidification.
Purpose of the Study:
- To develop a selective separation catalysis membrane (SSCM) for an efficient and eco-friendly persulfate-based advanced oxidation process.
- To address the limitations of powdered catalysts in organic pollutant remediation.
Main Methods:
- Fabrication of a SSCM with a polydimethylsiloxane layer for selective pollutant penetration and a magnetic nitrogen-doped porous carbon catalyst layer.
- Testing the SSCM's performance in removing phenol in the presence of humic acid, evaluating oxidant and catalyst dosage reduction, and assessing humic acid rejection and pH changes.
Main Results:
- SSCM reduced peroxymonosulfate dosage by over 40% and catalyst dosage by 97.8% for 80% phenol removal.
- Achieved >91.43% humic acid rejection over 100 hours, demonstrating selective pollutant extraction.
- Minimized pH drop in the receiving solution compared to the feed, mitigating acidification.
Conclusions:
- The SSCM facilitates catalyst reuse, significantly lowers oxidant requirements, and prevents secondary pollution like acidification.
- The membrane's design enables pollutant isolation, catalyst anchoring, and reaction compartmentalization, showing great potential for environmental remediation applications.
