Degradation of methylene blue using peroxydisulfate activated by zinc and sulfur functional biochar
Zinc (Zn) and sulfur (S) functional biochar (Zn/S-BC) was prepared by simple and environmental friendly plant enrichment method combined with one-step pyrolysis method using invasive species water hyacinth as raw material and zinc sulfate heptahydrate (ZnSO4·7H2O) solution as culture medium. The mor...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Industrial Water Treatment
2024-11-01
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| Series: | Gongye shui chuli |
| Subjects: | |
| Online Access: | https://www.iwt.cn/CN/10.19965/j.cnki.iwt.2023-1055 |
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| Summary: | Zinc (Zn) and sulfur (S) functional biochar (Zn/S-BC) was prepared by simple and environmental friendly plant enrichment method combined with one-step pyrolysis method using invasive species water hyacinth as raw material and zinc sulfate heptahydrate (ZnSO4·7H2O) solution as culture medium. The morphology and structure of Zn/S-BC were characterized by SEM, BET, FT-IR, XRD, and XPS. Taking methylene blue (MB) as the main pollutant, the effects of different systems, Zn/S-BC dosage, PDS dosage, initial pH, coexisting inorganic anions and different mass concentrations of MB on the degradation of MB by Zn/S-BC activated peroxydisulfate (PDS) were investigated, and the dominant active substances playing a leading role in the degradation of MB in the system were explored. The experimental results showed that the degradation rate of MB in the system was 98.7% at the condition of initial pH of 7.08, 0.2 g/L Zn/S-BC, 0.3 mmol/L PDS, 50 mg/L MB and 25 ℃. The Zn/S-BC-PDS system also showed good degradation effects on high mass concentrations of MB (100, 500, 1 000 mg/L), methyl orange (MO) and tetracycline (TC). Sulfate radicals (SO4·-), hydroxyl radicals (·OH) and singlet oxygen (1O2) were the dominant active substances in the MB degradation process. In addition, the oxygen-containing functional groups C—O, pyridine-N, graphite-N and thiophenic sulfur on the surface of the catalyst would also participate in the removal of MB. Zn/S-BC-PDS system had good anti-interference and stability. This study provided a reference for the preparation of green and efficient catalysts and the catalytic degradation of organic pollutants by PDS. |
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| ISSN: | 1005-829X |