| Author: | Li, Tao |
| Title: | Degradation of propanil pesticide by pyrite-activated peroxymonosulfate |
| Advisors: | Chu, Wei (CEE) |
| Degree: | M.Sc. |
| Year: | 2019 |
| Subject: | Soil remediation Pesticides -- Biodegradation Hong Kong Polytechnic University -- Dissertations |
| Department: | Department of Civil and Environmental Engineering |
| Pages: | ix, 50 pages : color illustrations |
| Language: | English |
| Abstract: | In this study, the degradation of propanil was demonstrated by pyrite catalyst-activated peroxymonosulfate (PMS). Pyrite is an abundant sulfide-associated iron mineral possessing good catalytic performance in PMS activation. In this case, more than 90% of propanil (0.01 mM) was degraded by the combination of 0.5 g/L pyrite and 1.0 mM PMS within 15 min of reaction. The effects of different experimental parameters, including catalyst loading, PMS dosage, propanil dosage as well as solution pH, have been examined. Interestingly, two high degradation efficiencies occurred at pH 2.9 and pH 9.1, which was owing to the favorable iron leaching and generation of active radicals, respectively. SO•-4 and •OH were verified to be the predominant driving force of propanil degradation, where •OH took a primary role over SO•-4. Influences of natural water constituents on proposed PMS/pyrite system have been investigated by examining the effects of several co-existing anions, including HPO-4, Cl-, HCO-3, NO-3, NO-2, SO2-4. With four reuse cycles, pyrite catalyst has a certain degree of stability and is provided with good application prospects in AOPs field. Further, the PMS/pyrite system was tested to become a promising method in mineralizing propanil as well as its intermediates with TOC reduction of 73% in 240 min. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 5293.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 1.31 MB | Adobe PDF | View/Open |
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