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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 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.
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 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.
Degradation of methylene blue using peroxydisulfate activated by zinc and sulfur functional biochar
QIN Yixue (author) / WANG Sheng (author) / ZHANG Bingbing (author) / CHEN Weijie (author) / AN Mingze (author) / YANG Zhao (author) / QIN Shuhao (author)
2024
Article (Journal)
Electronic Resource
Unknown
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