使用化学改性壳聚糖吸附水溶液中的六价铬和六价铬与三价铬的形态。

Adsorption of Cr(VI) and speciation of Cr(VI) and Cr(III) in aqueous solutions using chemically modified chitosan.

机构信息

College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, China.

出版信息

Int J Environ Res Public Health. 2012 May;9(5):1757-70. doi: 10.3390/ijerph9051757. Epub 2012 May 7.

DOI:10.3390/ijerph9051757

PMID:22754471

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3386586/

Abstract

A new type of grafting chitosan (CTS) was synthesized using 2-hydroxyethyl-trimethyl ammonium chloride (HGCTS). The adsorption of Cr(VI) on HGCTS was studied. The effect factors on adsorption and the adsorption mechanism were considered. The results indicated that the HGCTS could concentrate and separate Cr(VI) at pH 4.0; the adsorption equilibrium time was 80 min; the maximum adsorption capacity was 205 mg/g. The adsorption isotherm and kinetics were investigated, equilibrium data agreed very well with the Langmuir model and the pseudo second-order model could describe the adsorption process better than the pseudo first-order model. A novel method for speciation of Cr(VI) and Cr(III) in environmental water samples has been developed using HGCTS as adsorbent and FAAS as determination means. The detection limit of this method was 20 ng/L, the relatively standard deviation was 1.2% and the recovery was 99%~105%.

摘要

一种新型的接枝壳聚糖（CTS）是使用 2-羟乙基三甲基氯化铵（HGCTS）合成的。研究了 Cr(VI) 在 HGCTS 上的吸附。考虑了吸附的影响因素和吸附机理。结果表明，HGCTS 可以在 pH 4.0 时浓缩和分离 Cr(VI)；吸附平衡时间为 80 min；最大吸附容量为 205 mg/g。研究了吸附等温线和动力学，平衡数据与 Langmuir 模型非常吻合，准二级模型比准一级模型更能描述吸附过程。使用 HGCTS 作为吸附剂和 FAAS 作为测定手段，建立了一种用于环境水样中 Cr(VI)和 Cr(III)形态分析的新方法。该方法的检测限为 20 ng/L，相对标准偏差为 1.2%，回收率为 99%~105%。