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首页> 外文期刊>Clean technologies and environmental policy >Synthesis, characterization, and application of modified silica in the removal and preconcentration of lead ions from natural river water
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Synthesis, characterization, and application of modified silica in the removal and preconcentration of lead ions from natural river water

机译：改性二氧化硅的合成，表征及在天然河水中铅离子的去除和富集中的应用

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Abstract This paper describes the synthesis, modification, and application of modified silica for the removal of lead ions from aqueous medium. The modification reaction provided a reduction in surface are from 737 to 399 m~2 g~', which was attributed to the 4-amine-2-mercaptopyrimidine molecule attachment onto its surface. The characterization through FTIR spectra demonstrated bands at 3347 cm"1 assigned to N-H stretching vibrations and the absence of thiol bands at 2600 e 2547 cm"' at Si-mod spectrum is an indicative that the attachment occurred via SH groups. The linearization of adsorption isotherm data through the modified Langmuir equation resulted in a maximum adsorption capacity of 2.9 μmol g~(-1). The material was applied in a continuous flow system in the preconcentration of water samples from Parana River and the results were in agreement with metal concentration determined directly through atomic absorption spectrometry with graphite furnace. The method validation was performed through analysis of water standard reference material (1643e), which also presented a 7.2-fold enrichment factor.
机译：摘要本文介绍了改性二氧化硅的合成，改性及其在水性介质中去除铅离子的应用。修饰反应提供了从737到399 m〜2 g''的表面减少，这归因于4-胺-2-巯基嘧啶分子附着在其表面上。通过FTIR光谱的表征表明，在3347cm-1处的带被指定为N-H拉伸振动，并且在Si-mod谱处在2600e 2547cm-1处不存在硫醇带表明了通过SH基团发生了附着。通过修正的Langmuir方程线性化吸附等温线数据导致最大吸附容量为2.9μmolg〜（-1）。该材料被应用于连续流系统中，对来自巴拉那河的水样进行预浓缩，其结果与通过石墨炉原子吸收光谱法直接测定的金属浓度相符。通过对水标准参考物质（1643e）的分析进行方法验证，该参考物质的富集系数也达到7.2倍。

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