Rapid abiotic As removal from As-rich acid mine drainage: Effect of pH, Fe/As molar ratio, oxygen, temperature, initial As concentration and neutralization reagent
Rapid abiotic As removal from As-rich acid mine drainage: Effect of pH, Fe/As molar ratio, oxygen, temperature, initial As concentration and neutralization reagent
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富砷酸性矿山废水中非生物砷的快速去除：pH、铁/砷摩尔比、氧气、温度、初始砷浓度和中和剂的影响
DOI：
10.1016/j.cej.2019.122156
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发表时间：
2019-12
影响因子：
15.1
通讯作者：
Jia Yongfeng
中科院分区：
文献类型：
--
作者：
Yuan Zidan;Zhang Guoqing;Ma Xu;Yu Le;Wang Xin;Wang Shaofeng;Jia Yongfeng
采用氧诱导无机氧化法去除高砷酸性矿山废水中的砷，研究了Fe-As共沉淀法去除高砷酸性矿山废水中砷的工艺。考察了pH、Fe/As摩尔比、氧气流量、温度、As初始浓度和中和剂对As去除的影响。结果表明，pH值对As的去除率有很强的控制作用，反应12 h后，随着pH值从2增加到7，As的去除率从33.0%增加到96.2%。pH值对As（III）的氧化也很重要。As（III）的氧化程度（12.4-35.4%）一般随pH的增加而增加，但最佳As（III）氧化（45%）发生在pH 5。除pH值外，其它5个因素对砷去除率的影响较小，Fe（II）供给不足和过量均导致As（III）氧化程度降低。Fe（II）和As（III）的氧化机理可能是Fe（II）和O2以活性氧（ROS）为氧化剂的类Fenton反应。铁砷石/羟基硫酸亚砷酸铁、砷酸铁和含As（III + V）的水铁矿对As的固定起主要作用。
Oxygen-induced abio-oxidation of Fe(II) and As(III) for Fe-As co-precipitation is proposed in this work as a cost-saving and time-saving method to remove As from As-rich acid mine drainage (AMD). The effect of pH, Fe/As molar ratio, oxygen flow rate, temperature, initial As concentration and neutralization reagent on As removal was investigated. The results showed that As removal efficiency was strongly controlled by pH, which increased from 33.0% to 96.2% as increasing pH from 2 to 7 after 12 h-reactions. pH was also very important to As(III) oxidation. The oxidation degree of As(III) (12.4–35.4%) generally increased with the increase of pH, but the optimal As(III) oxidation (45%) occurred at pH 5. Arsenic removal is much less affected by other five factors than pH. Insufficient and excessive Fe(II) supply caused the decrease of oxidation degree of As(III). Fenton-like reaction between Fe(II) and O2with reactive oxygen species (ROS) as oxidizers was the probable mechanism for Fe(II) and As(III) oxidation. Tooeleite/ferric arsenite hydroxysulfate, ferric arsenate and As(III + V)-bearing ferrihydrite were major responsible for As immobilization.
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DOI：
10.1016/j.saa.2012.11.016
发表时间：
2013-02
期刊：
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy
影响因子：
--
作者：
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通讯作者：
Jing Liu;Hongfei Cheng;R. Frost;F. Dong
影响因子：
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作者：
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影响因子：
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作者：
Jia, Yongfeng;Xu, Liying;Demopoulos, George P.
通讯作者：
Demopoulos, George P.
影响因子：
5
作者：
D. Paktunc;J. Dutrizac;V. Gertsman
通讯作者：
D. Paktunc;J. Dutrizac;V. Gertsman