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首页> 外文期刊>Applied Surface Science >Syntheses, characterization and adsorption properties for Pb2+ of silica-gel functionalized by dendrimer-like polyamidoamine and 5-sulfosalicylic acid
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Syntheses, characterization and adsorption properties for Pb2+ of silica-gel functionalized by dendrimer-like polyamidoamine and 5-sulfosalicylic acid

机译：类树枝状聚酰胺酰胺和5-磺基水杨酸官能化的硅胶中Pb2 +的合成，表征和吸附性能

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摘要

Silica-gel adsorbents PAMAM-n.OSSASG (n = 1-4) with dendrimer-like polyamidoamine (PAMAM) and 5-sulfosalicylic acid as functional groups were prepared and characterized with FTIR, SEM, TG, elemental analysis and porous structure analysis. Micro-column enrichment and measurement of Pb2+ with graphite furnace atomic absorption spectroscopy (GFAAS) was studied with PAMAM-n.OSSASG (n = 1-4) as adsorbent. It was emphasized to investigate the relationship between dynamic adsorption/desorption rates, adsorption capacities, and grafting percentage of PAMAM onto silica-gel surface. Experiments showed that the generation increase of grafted PAMAM changed the pore diameter distribution of adsorbent and obviously improved adsorption/desorption property for Pb2+. Adsorption capacity of PAMAM-n.OSSASG (n = 1-4) was 14.04, 17.43, 20.07 and 25.05 mg g(-1) for Pb2+ respectively. An enrichment factor of 200 was obtained with PAMAM-4.0SSASG as adsorbent and with 2000 mL Pb2+ solution (1.0 ng mL(-1)). The priority of adsorption property of PAMAM-4.0SSASG was explained by steric hindrance effect of PAMAM on adsorption/desorption, and selective adsorption of 5-sulfosalicylic acid with Pb2+. With PAMAM-4.0SSASG as adsorbent, GFAAS method for analysis of Pb2+ combined with micro-column enrichment was proposed and applied to the determination of Pb2+ of standard reference sample and sea water sample. (C) 2015 Elsevier B.V. All rights reserved.
机译：制备了以树状大分子聚酰氨基胺（PAMAM）和5-磺基水杨酸为官能团的硅胶吸附剂PAMAM-n.OSSASG（n = 1-4），并用FTIR，SEM，TG，元素分析和多孔结构分析对其进行了表征。以PAMAM-n.OSSASG（n = 1-4）为吸附剂，研究了石墨炉原子吸收光谱法（GFAAS）进行的微柱富集和Pb2 +的测定。强调研究动态吸附/解吸速率，吸附容量和PAMAM在硅胶表面上的接枝率之间的关系。实验表明，接枝PAMAM的生成增加改变了吸附剂的孔径分布，并明显改善了Pb2 +的吸附/解吸性能。 PAMAM-n.OSSASG（n = 1-4）对Pb2 +的吸附容量分别为14.04、17.43、20.07和25.05 mg g（-1）。用PAMAM-4.0SSASG作为吸附剂和2000 mL Pb2 +溶液（1.0 ng mL（-1））获得的富集系数为200。 PAMAM-4.0SSASG吸附性能的优先考虑因素是PAMAM对吸附/解吸的空间位阻效应，以及Pb2 +对5-磺基水杨酸的选择性吸附。以PAMAM-4.0SSASG为吸附剂，提出了GFAAS分析微柱富集的Pb2 +分析方法，并将其用于标准参考样品和海水样品中Pb2 +的测定。 （C）2015 Elsevier B.V.保留所有权利。

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