Coagulation of methylated arsenic from drinking water: Influence of methyl substitution
文献类型：期刊论文
| 作者 | Hu, Chengzhi; Chen, Qingxin; Liu, Huijuan; Qu, Jiuhui |
| 刊名 | JOURNAL OF HAZARDOUS MATERIALS
 |
| 出版日期 | 2015-08-15 |
| 卷号 | 293期号:0页码:97-104 |
| 关键词 | Organic arsenic Coagulation Floc Iron Aluminum |
| 英文摘要 | Methylated arsenic can be found in virtually all earth surface environments. So far, however, little information has been collected regarding their removal by coagulation. In this study, the removal of monomethylarsenate (MMA) and dimethylarsenate (DMA) from drinking water by coagulation was investigated from the viewpoint of methyl substitution. Results indicated that FeCl3 was more efficient than AlCl3 and polyaluminum chloride (PACl) in methylated As removal. For the initial arsenic concentration of 200 mu g/L, an FeCl3 dosage of 0.2 mmol Fe/L was sufficient to attain about 95% removal of MMA, while a dosage of 0.6 mmol Fe/L achieved about 57% removal of DMA. Arsenic removal efficiency was negatively correlated with the degree of methyl substitution. With the increase in methyl group number, the quantity of negatively charged arsenic species decreased and molecular size increased, leading to the decrease of methylated As removal by coagulation. Adsorption on preformed hydroxide flocs was the major mechanism during coagulation. Both FTIR and XPS results indicated that the As-O group of As might substitute the O-H group of Fe/Al hydroxide to form a Fe/Al-O-As complex. Furthermore, the use of traditional oxidants and coagulation aids exhibited limited help for improving coagulation removal of DMA. (C) 2015 Elsevier B.V. All rights reserved. |
| 研究领域[WOS] | Engineering, Environmental ; Engineering, Civil ; Environmental Sciences |
| WOS记录号 | WOS:000355043000013 |
| 公开日期 | 2016-03-15 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/32742]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Hu, Chengzhi,Chen, Qingxin,Liu, Huijuan,et al. Coagulation of methylated arsenic from drinking water: Influence of methyl substitution[J]. JOURNAL OF HAZARDOUS MATERIALS,2015,293(0):97-104. |
| APA | Hu, Chengzhi,Chen, Qingxin,Liu, Huijuan,&Qu, Jiuhui.(2015).Coagulation of methylated arsenic from drinking water: Influence of methyl substitution.JOURNAL OF HAZARDOUS MATERIALS,293(0),97-104. |
| MLA | Hu, Chengzhi,et al."Coagulation of methylated arsenic from drinking water: Influence of methyl substitution".JOURNAL OF HAZARDOUS MATERIALS 293.0(2015):97-104. |
入库方式： OAI收割
来源：生态环境研究中心
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