Improving reductive performance of zero valent iron by H2O2/HCl pretreatment: A case study on nitrate reduction
Improving reductive performance of zero valent iron by H2O2/HCl pretreatment: A case study on nitrate reduction
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H2O2/HCl 预处理提高零价铁的还原性能：硝酸盐还原案例研究
DOI：
10.1016/j.cej.2017.12.005
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发表时间：
2018
影响因子：
15.1
通讯作者：
Bingcai Pan
中科院分区：
文献类型：
--
作者：
Zhe Yang;Chao Shan;Yuchen Mei;Zhao Jiang;Xiaohong Guan;Bingcai Pan
研究了一种简单的方法，通过H2 O2/HCl预处理零价铁（ZVI）制备具有优异还原能力的ZVI基试剂（prtZVI）。用57 Fe穆斯堡尔谱、XRD、TEM和化学分析表征prtZVI系统表明，它是一个分散良好的系统，含有纳米级固体，如ZVI、磁铁矿、FeII相关的铁氧化物/（氧）氢氧化物，以及可溶性物种如Fe 2+和Cl−。prtZVI在较宽的pH范围内（4-10）、较短的反应时间和较低的固体投加量下即可实现对硝酸盐（初始浓度为20 mg N/L）的高效还原，其效果明显上级单独用H2 O2、HCl或NaCl预处理的ZVI以及传统的ZVI体系。长期储存的prtZVI系统（30 d）没有造成任何负面影响的硝酸盐还原。15 N同位素分析表明，NH 4+是主要的水产物（>95%）和N2是唯一的气体之一。考虑到突出的还原效率，简单的合成，和长期的稳定性，prtZVI系统可以作为一个有前途的ZVI技术还原去除污染物的关注。
This study demonstrates a simple method to prepare zero valent iron (ZVI)-based agent (prtZVI) with outstanding reducing power via pretreating ZVI with H2O2/HCl. Characterization of the prtZVI system with57Fe Mössbauer spectroscopy, XRD, TEM and chemical analysis indicates that it is a well dispersed system, containing nanosized solids such as ZVI, magnetite, FeII-associated iron oxides/(oxy)hydroxides, as well as soluble species like Fe2+and Cl−. Highly effective reduction of nitrate (20 mg N/L initially) by prtZVI could be realized in a broad pH range (4–10), short reaction time, and at low solid dosage, which is much superior to ZVIs pretreated by H2O2, HCl, or NaCl alone and the traditional ZVI systems as well. Long-term storage of the prtZVI system (30 d) did not pose any negative effect on the nitrate reduction.15N isotopic analysis reveals that NH4+is the major aqueous product (>95%) and N2is the only gaseous one. Considering the outstanding reduction efficiency, simple synthesis, and long-term stability, the prtZVI system could serve as a promising ZVI technology for reductive removal of contaminants of concern.