Biochar mediates activation of aged nanoscale ZVI by Shewanella putrefaciens CN32 to enhance the degradation of Pentachlorophenol
| Autor: | Carolina Belver, Hui Li, Xue Jun Tan, Shuai Chen, Li Yang Zhou, Lu Yao Ren, Jorge Bedia, Jie Yang, Yu Zhu |
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| Rok vydání: | 2019 |
| Předmět: |
Zerovalent iron
Semiquinone biology Chemistry General Chemical Engineering 02 engineering and technology General Chemistry Shewanella putrefaciens 010402 general chemistry 021001 nanoscience & nanotechnology biology.organism_classification 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Pentachlorophenol chemistry.chemical_compound Biochar Reductive dechlorination Environmental Chemistry Phenol Vivianite 0210 nano-technology Nuclear chemistry |
| Zdroj: | Chemical Engineering Journal. 368:148-156 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2019.02.099 |
| Popis: | The bioreduction of aged nanoscale zero valent iron (NZVI) by Shewanella putrefaciens CN32 (CN32) in the presence of different biochar materials was conducted to understand how biochars mediated the activation of aged NZVI to enhance the removal efficiency of contaminants. The results indicated that the prepared biochars contained different oxygen-containing functional groups (such as O C O, COOH, C O, C O, C C, C H and C C). The biochars significantly enhance electron transfer from CN32 to aged NZVI, thus accelerating reductive dechlorination of Pentachlorophenol (PCP). The maximum PCP degradation rate (kmax) was 2.45 mg·L−1·d−1, which was 2.6 times greater than that of the biochar-free control (0.94 mg·L−1·d−1). The intermediates of phenol were detected after 30 days, likely indicating that reductive dechlorination was the dechlorination pathway of PCP. The X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis showed that vivianite, as a secondary mineral, was formed during the bioreduction aged NZVI-BC600 (Biochar prepared at 600 °C with NZVI activation) by CN32. Vivianite was formed mainly through the reaction of Fe(II) and PO43−. The combined electrochemical and electron paramagnetic resonance analysis might suggest that biochar associated semiquinone radical (C O) were likely involved in the bioreduction of aged NZVI. This study provided some theoretical support for further research on biochar mediated bioreduction activation of aged NZVI to enhance the degradation of contaminants. |
| Databáze: | OpenAIRE |
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