Mechanistic insights into sulfate and phosphate-mediated hexavalent chromium removal by tea polyphenols wrapped nano-zero-valent iron
文献类型：期刊论文
| 作者 | Du, Changsheng,; Xu, Nan,; Yao, Zihan,; Bai, Xu; Gao, Yuxi ; Peng, Lei,; Gu, Baohua; Zhao, Jiating
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| 刊名 | Science of the Total Environment
 |
| 出版日期 | 2022 |
| 卷号 | 850页码:157996 |
| ISSN号 | 00489697 |
| DOI | 10.1016/j.scitotenv.2022.157996 |
| 文献子类 | Article |
| 英文摘要 | Nano zero-valent iron via green synthesis (g-nZVI) has great potential in removing toxic hexavalent Cr(VI) from industrial wastewater. Sulfate and phosphate in wastewater can influence Cr(VI) removal by g-nZVI. In this study, the Cr(VI) removal kinetics by different g-nZVI materials were investigated with the existence of sulfate and/or phosphate, and the corresponding mechanisms were first revealed using multiple characterizations, including X-ray absorption near-edge spectra (XANES) and X-ray photoelectron spectroscopy (XPS). The results showed that Cr(OH)3 was the dominant species initially formed on the surface of g-nZVI particles before transforming to Cr2O3 during the reaction of g-nZVI with Cr(VI). Sulfate in wastewater can promote the reduction from Cr(VI) to Cr(OH)3 by g-nZVI, because sulfate triggers the release of Fe(II) and tea polyphenols (from tea extracts) from the g-nZVI surface due to the corrosion of Fe0 core, which is in line with an obvious increase in pseudo-second-order rate constant (k2) and subtle change in Cr(VI) removal capacity (qe). However, phosphate impedes the g-nZVI corrosion and inhibits qe because of the inner-sphere complexation of phosphate onto g-nZVI decreasing the released Fe(II) for Cr2O3 production. When sulfate and phosphate coexisted in contaminated water, the inhibition effect of phosphate in Cr(VI) removal by g-nZVI was stronger than the promotion of sulfate. Accordingly, qe value of g-nZVI declined from 93.4 mg g−1 to 77.5 mg g−1, while k2 remained constant as the molar ratio of phosphate/sulfate increased from 0.1 to 10 in water. This study provides new insights into applying g-nZVI in efficient Cr(VI) removal from contaminated water with enrichment of sulphates and phosphates. © 2022 |
| 电子版国际标准刊号 | 18791026 |
| 语种 | 英语 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/300345]  |
| 专题 | 高能物理研究所_多学科研究中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Du, Changsheng,,Xu, Nan,,Yao, Zihan,,et al. Mechanistic insights into sulfate and phosphate-mediated hexavalent chromium removal by tea polyphenols wrapped nano-zero-valent iron[J]. Science of the Total Environment,2022,850:157996. |
| APA | Du, Changsheng,.,Xu, Nan,.,Yao, Zihan,.,Bai, Xu.,Gao, Yuxi.,...&Zhao, Jiating.(2022).Mechanistic insights into sulfate and phosphate-mediated hexavalent chromium removal by tea polyphenols wrapped nano-zero-valent iron.Science of the Total Environment,850,157996. |
| MLA | Du, Changsheng,,et al."Mechanistic insights into sulfate and phosphate-mediated hexavalent chromium removal by tea polyphenols wrapped nano-zero-valent iron".Science of the Total Environment 850(2022):157996. |
入库方式： OAI收割
来源：高能物理研究所
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