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一种含有偶氮苯酚羧酸盐官能团的新型螯合树脂:合成、表征及其在废水中铬形态分析的应用

A new chelating resin containing azophenolcarboxylate functionality: synthesis, characterization and application to chromium speciation in wastewater.

作者信息

Pramanik Sadhan, Dey Sourav, Chattopadhyay Pabitra

机构信息

Department of Chemistry, The University of Burdwan, Burdwan 713104, India.

出版信息

Anal Chim Acta. 2007 Feb 19;584(2):469-76. doi: 10.1016/j.aca.2006.11.041. Epub 2006 Nov 21.

Abstract

The synthesis of a new stable chelating resin from the polystyrene divinylbenzene copolymer is reported. The polystyrene is first functionalized with a phenolic group and then allowed to couple with diazotized anthranilic acid through the --N==N-- bond. The resulting polymer containing azophenolcarboxylate with an ONO chelating environment has been characterized by elemental analysis, hydrogen ion capacity, and water regain value. Its stability towards thermal and different chemical environments has been evaluated. The sorption capacity of the chelating resin for Cr(III) and Cr(VI) as a function of pH has been studied. The interesting point is that chromium(III) is selectively retained at ca. pH 5.0 and chromium(VI) at ca. pH 2.0. When packed in a column, the new material is able to separate Cr(III) from Cr(VI). Five replicate determinations of 10 microg Cr(III) and 10 microg Cr(VI) present in 100 mL solution gave recoveries of 96.9+/-2.9% (for Cr(III)) and 96.2+/-2.1% (for Cr(VI)) at the 95% confidence level. Calibration graph was linear over the concentration range of 0-250 microg L(-1) of chromium species with correlation coefficient (R) of 0.99994. The detection limits based on 3sigma criterion were determined to be 0.6 microg L(-1) for Cr(III) and 0.9 microg L(-1) for Cr(VI). The developed method was successfully used for the speciation of chromium in wastewater.

摘要

报道了一种由聚苯乙烯二乙烯基苯共聚物合成新型稳定螯合树脂的方法。首先将聚苯乙烯用酚基官能化,然后使其通过-N=N-键与重氮化邻氨基苯甲酸偶联。所得含有具有ONO螯合环境的偶氮苯酚羧酸盐的聚合物已通过元素分析、氢离子容量和回潮值进行了表征。评估了其对热和不同化学环境的稳定性。研究了螯合树脂对Cr(III)和Cr(VI)的吸附容量随pH的变化。有趣的是,铬(III)在约pH 5.0时被选择性保留,铬(VI)在约pH 2.0时被保留。当填充在柱中时,这种新材料能够将Cr(III)与Cr(VI)分离。对100 mL溶液中存在的10 μg Cr(III)和10 μg Cr(VI)进行五次重复测定,在95%置信水平下,Cr(III)的回收率为96.9±2.9%,Cr(VI)的回收率为96.2±2.1%。校准曲线在0-250 μg L(-1)铬物种浓度范围内呈线性,相关系数(R)为0.99994。基于3σ标准确定的检测限为Cr(III) 0.6 μg L(-1),Cr(VI) 0.9 μg L(-1)。所开发的方法成功用于废水中铬的形态分析。

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