Dry-column Vacuum Chromatographic Removal of Hg2+ from Wastewater Based on an Acridino-crown Ether-modified Spherical Silica Gel Adsorbent

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-05-09 DOI:10.3311/ppch.21563

Panna Vezse, János Attila Kalóczkai, D. Ster, L. Bezúr, Ádám Golcs, P. Huszthy, T. Tóth

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Abstract

Dry-column vacuum chromatographic technique is introduced for remediation of wastewater for the first time. A previously prepared chemically modified silica gel containing covalently immobilized Hg2+-selective acridino-crown ether selector molecules was used as an adsorbent. Removal of Hg2+ from highly contaminated river water was carried out to study practical applicability. Adsorption capacity, preconcentration factor, pH-sensitivity and selectivity in separation were determined. The adsorbent proved to be outstanding in selectivity, only Ag+ and Cu2+ interfered among 29 cations, was inert toward organic contaminants, exhibited regenerability and pH-independency between 3.0 ≤ pH ≤ 7.0. The proposed method showed a moderate efficiency in both adsorption (32 mg Hg2+ / 1 g adsorbent) and preconcentration (preconcentration factor of 100). A maximum 10 L of wastewater / 1 g adsorbent ratio is recommended as an upper limit for applicability. The described method showed a unique robustness and simplicity compared to conventional ion-chromatographic methods and an improved selectivity over physical interaction- or simple functional group-based adsorptions.

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基于吖啶酮冠醚改性球形硅胶吸附剂的干柱真空色谱法去除废水中的Hg2+

首次介绍了干柱真空色谱技术用于废水的修复。采用先前制备的含有共价固定Hg2+选择性吖啶醇冠醚选择分子的化学改性硅胶作为吸附剂。对高污染河水中Hg2+的去除进行了实用性研究。测定了吸附量、预富集系数、ph敏感性和分离选择性。结果表明，该吸附剂具有良好的选择性，29种阳离子中只有Ag+和Cu2+干扰，对有机污染物具有惰性，在3.0≤pH≤7.0范围内具有可再生性和pH不依赖性。该方法具有中等的吸附效率(32 mg Hg2+ / 1 g吸附剂)和预富集效率(预富集系数为100)。建议最大10l废水/ 1g吸附剂比作为适用性的上限。与传统的离子色谱方法相比，所描述的方法具有独特的稳健性和简单性，并且比基于物理相互作用或简单官能团的吸附具有更高的选择性。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.