Synthesis and Characterization of Mesoporous Materials Functionalized with Phosphinic Acid Ligand and Their Capability to Remove Cd(II).

IF 4.2 2区化学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY Molecules Pub Date : 2024-11-02 DOI:10.3390/molecules29215199

Khayra Mersellem, Djamila Bouazza, Irene Malpartida, Pedro Maireles-Torres, Anne Boos, Hary Demey, Hafida Miloudi

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Abstract

This article presents a study of cadmium removal from nitrate medium using adsorption in calcined mesoporous silica (MCM-C), mesoporous silica doped (MCM_DIOPA), and calcined and impregnated mesoporous silica (MCM@DIOPA), with diisooctylphosphinic acid (DIOPA). The sorbents were synthesized via a sol-gel method. Several characterization techniques, such as XRD, FTIR spectroscopy, N₂ sorption and elemental analysis, have been used to determine the main structural, textural, and chemical properties of prepared sorbents. Batch adsorption and kinetics tests were carried out, where the influence of pH and contact time of the sorbents and their role in cation removal were studied. Experimental results show poor sorption efficiencies with MCM-C and MCM_DIOPA at pH 5.85. At the same pH, better cadmium extraction was attained by MCM@DIOPA and was achieved within 30 min. The pseudo-second-order model is the most appropriate model to describe the elimination mechanism of Cd(II) ions. The Langmuir equation was used to model the sorption isotherm and the maximum sorption capacity of Cd(II) is 22.16 mg/g (200 mmol/kg). The complex type of the probable extracted species isCdL2-HL.

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膦酸配体功能化介孔材料的合成与表征及其去除镉（II）的能力

本文介绍了利用二异辛基膦酸 (DIOPA) 在煅烧介孔二氧化硅 (MCM-C)、掺杂介孔二氧化硅 (MCM_DIOPA) 和煅烧浸渍介孔二氧化硅 (MCM@DIOPA) 中的吸附作用去除硝酸盐介质中镉的研究。这些吸附剂是通过溶胶-凝胶法合成的。为了确定所制备吸附剂的主要结构、质地和化学特性，采用了多种表征技术，如 X 射线衍射、傅立叶变换红外光谱、N2 吸附和元素分析。还进行了批量吸附和动力学试验，研究了吸附剂的 pH 值和接触时间的影响及其在阳离子去除中的作用。实验结果表明，在 pH 值为 5.85 时，MCM-C 和 MCM_DIOPA 的吸附效率较低。在相同的 pH 值下，MCM@DIOPA 对镉的萃取效果更好，而且在 30 分钟内就能实现。伪二阶模型是描述镉（II）离子消除机制的最合适模型。吸附等温线采用 Langmuir 方程建模，镉（II）的最大吸附容量为 22.16 mg/g（200 mmol/kg）。可能萃取的物种的络合物类型为 CdL2-HL。

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来源期刊

Molecules 化学-有机化学

CiteScore

7.40

自引率

8.70%

发文量

7524

审稿时长

1.4 months

期刊介绍： Molecules (ISSN 1420-3049, CODEN: MOLEFW) is an open access journal of synthetic organic chemistry and natural product chemistry. All articles are peer-reviewed and published continously upon acceptance. Molecules is published by MDPI, Basel, Switzerland. Our aim is to encourage chemists to publish as much as possible their experimental detail, particularly synthetic procedures and characterization information. There is no restriction on the length of the experimental section. In addition, availability of compound samples is published and considered as important information. Authors are encouraged to register or deposit their chemical samples through the non-profit international organization Molecular Diversity Preservation International (MDPI). Molecules has been launched in 1996 to preserve and exploit molecular diversity of both, chemical information and chemical substances.