Bi-functionalized MCM-41 for heavy metal ions removal: synthesis, enhanced performance and mechanism study

IF 2.5 4区材料科学 Q2 CHEMISTRY, APPLIED Journal of Porous Materials Pub Date : 2024-06-06 DOI:10.1007/s10934-024-01642-4

Qingling Liao, Fumin Ma, Yongjun Fu, Wei Feng, Ying Lu

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Abstract

This work reports the amine and mercapto bi-functionalized mesoporous silica MCM-41 for heavy metal ions removal from aqueous solutions. XRD, FTIR and N₂ adsorption–desorption analyses confirmed that a series of bi-functionalized mesoporous silica MCM-41 with huge specific surface area were successfully obtained. In aqueous solution, the adsorption performance were evaluated by the adsorption of Zn(II), Cu(II), Cr(III) and Pb(II). The obtained results indicate that synthesis process has no significant influence on the structure and the existence of functional group resulted in outstanding adsorption capacity. The methodology of pre-hydrolysis was one effective treatment for grafting useful functional group on to mesoporous silica. The adsorption reactions for the adsorption of heavy metal ions by bi-functionalized silica-based mesoporous materials were spontaneous adsorption processes over the range of experimental temperatures. The adsorption isotherm is consistent with the Freundlich adsorption isotherms model. The Freundlich parameters K_F and n indicated favorable adsorption. The adsorption kinetics of heavy metalions over these bi-functionalized mesoporous silica could be well described by pseudo-second-order models. Therefore, this bi-functionalized mesoporous material has promise for the removal and recovery of heavy metal ions from water.

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用于去除重金属离子的双功能化 MCM-41：合成、增强性能和机理研究

本研究报告了用于去除水溶液中重金属离子的胺和巯基双功能化介孔二氧化硅 MCM-41。XRD、FTIR 和 N2 吸附-解吸分析证实，成功获得了一系列具有巨大比表面积的双官能化介孔二氧化硅 MCM-41。在水溶液中，通过吸附 Zn(II)、Cu(II)、Cr(III) 和 Pb(II) 对其吸附性能进行了评估。结果表明，合成过程对其结构没有显著影响，而官能团的存在使其具有出色的吸附能力。预水解方法是在介孔二氧化硅上接枝有用官能团的一种有效处理方法。在实验温度范围内，双官能团介孔二氧化硅材料对重金属离子的吸附反应是自发的吸附过程。吸附等温线符合 Freundlich 吸附等温线模型。Freundlich 参数 KF 和 n 表明吸附效果良好。重金属离子在这些双功能化介孔二氧化硅上的吸附动力学可以用伪二阶模型很好地描述。因此，这种双功能化介孔材料有望用于去除和回收水中的重金属离子。

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来源期刊

Journal of Porous Materials 工程技术-材料科学：综合

CiteScore

4.80

自引率

7.70%

发文量

203

审稿时长

2.6 months

期刊介绍： The Journal of Porous Materials is an interdisciplinary and international periodical devoted to all types of porous materials. Its aim is the rapid publication of high quality, peer-reviewed papers focused on the synthesis, processing, characterization and property evaluation of all porous materials. The objective is to establish a unique journal that will serve as a principal means of communication for the growing interdisciplinary field of porous materials. Porous materials include microporous materials with 50 nm pores. Examples of microporous materials are natural and synthetic molecular sieves, cationic and anionic clays, pillared clays, tobermorites, pillared Zr and Ti phosphates, spherosilicates, carbons, porous polymers, xerogels, etc. Mesoporous materials include synthetic molecular sieves, xerogels, aerogels, glasses, glass ceramics, porous polymers, etc.; while macroporous materials include ceramics, glass ceramics, porous polymers, aerogels, cement, etc. The porous materials can be crystalline, semicrystalline or noncrystalline, or combinations thereof. They can also be either organic, inorganic, or their composites. The overall objective of the journal is the establishment of one main forum covering the basic and applied aspects of all porous materials.