零价铁
亚硝酸盐
硝酸盐
可渗透反应墙
无机化学
氧化剂
材料科学
纳米颗粒
水溶液
钝化
核化学
人体净化
环境修复
化学
吸附
污染
纳米技术
有机化学
废物管理
生态学
图层(电子)
生物
工程类
作者
Kuen–Song Lin,Ni‐Bin Chang,Tien-Deng Chuang
出处
期刊:NANO
[World Scientific]
日期:2008-08-01
卷期号:03 (04): 291-295
被引量:7
标识
DOI:10.1142/s1793292008001283
摘要
The chemical reduction of nitrate or nitrite species by zero-valent iron nanoparticle (ZVIN) in aqueous solution and related reaction kinetics or mechanisms using fine structure characterization were investigated. Experimentally, ZVIN of this study was prepared by borohydride reduction method at room temperature. The morphology of as-synthesized ZVIN shows that the nearly ball and ultrafine particles ranged of 20–50 nm were observed with FE-SEM analysis. The kinetic model of nitrites or nitrates reductive reaction by ZVIN is proposed as a pseudo-first-order kinetic equation. The nitrite and nitrate removal efficiencies using ZVIN were found 65–83% and 51–68%, respectively, based on three different initial concentrations. By using XRD patterns, the quantitative relationship between nitrite and Fe(III) or Fe(II) becomes similar to the one between nitrate and Fe(III) in the ZVIN study. The possible reason is linked with a faster nitrite reduction by ZVIN. In fact, the occurrence of the relative faster nitrite reductive reaction suggested that the passivation of the ZVIN have a significant contribution to iron corrosion. The XANES spectra show that the nitrites or nitrates reduce to N 2 while oxidizing the ZVIN to Fe 2 O 3 or Fe 3 O 4 electrochemically. It is also very clear that decontamination of nitrate or nitrite species in groundwater via the in-situ remediation with a ZVIN permeable reactive barrier would be environmentally attractive.
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