Effect of oxidation of activated carbon on its enrichment efficiency of metal ions: Comparison with oxidized and non-oxidized multi-walled carbon nanotubes
Effect of oxidation of activated carbon on its enrichment efficiency of metal ions: Comparison with oxidized and non-oxidized multi-walled carbon nanotubes
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DOI：
10.1016/j.talanta.2007.10.039
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发表时间：
2008-03-15
期刊：
影响因子：
6.1
通讯作者：
El-Sheikh, Amjad H.
中科院分区：
文献类型：
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作者：
El-Sheikh, Amjad H.
研究了不同氧化剂（硝酸、过氧化氢、过硫酸铵）对环境水中金属离子（Cr3+、Mn2+、Pb2+、Cu2+、Cd2+和Zn2+）火焰原子吸收光谱预富集的影响。在pH为9的条件下，硝酸氧化AC（吸附剂AC- na）作为预浓缩吸附剂，对金属离子的回收率和吸附能力最高。优化了以AC- na为吸附剂的预富集方法，并与未氧化AC进行了分析性能比较。采用AC-NA法检测灵敏度高，检出限低，线性范围宽。并与硝酸氧化多壁碳纳米管（吸附剂MWCNT- na）和未氧化多壁碳纳米管（吸附剂MWCNT）的分析性能进行了比较。AC-NA预富集法的分析性能接近MWCNT- na，但AC-NA的分析性能优于未氧化的MWCNT。将优化后的预富集方法（AC-NA吸附剂）应用于环境水（自来水、水库水、自来水）中，金属的回收率在63 ~ 104%之间。(C) 2007 Elsevier B.V.版权所有
The effect of oxidation of activated carbon (AC) with various oxidizing agents (nitric acid, hydrogen peroxide, ammonium persulfate) on preconcentration of metal ions (Cr3+, Mn2+, Pb2+, Cu2+, Cd2+ and Zn2+) from environmental waters prior to their flame atomic absorption spectroscopic analysis was investigated. The highest recoveries and adsorption capacities towards metal ions were achieved when using nitric acid-oxidized AC (sorbent AC-NA) as preconcentrating sorbent at pH 9. A preconcentration procedure was optimized using AC-NA as sorbent, which was then compared with non-oxidized AC in terms of analytical performance of the preconcentration method. Higher sensitivity, lower detection limits and wider linear ranges were achieved when AC-NA was used. The analytical performance of the method using AC-NA as preconcentrating sorbent was also compared with nitric acid-oxidized multi-walled carbon nanotubes (sorbent MWCNT-NA) and non-oxidized multi-walled carbon nanotubes (sorbent MWCNT). The analytical performance of the preconcentration method using AC-NA was close to MWCNT-NA, but AC-NA was better than non-oxidized MWCNT. Application of the optimized preconcentration method (using AC-NA sorbent) to environmental waters (tap water, reservoir water, stream water) gave spike recoveries of the metals in the range 63-104%. (C) 2007 Elsevier B.V. All rights reserved.