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Investigating the Heavy Metal Adsorption of Mesoporous Silica Materials Prepared by Microwave Synthesis

Mesoporous silica materials (MSMs) of the MCM-41 type were rapidly synthesized by microwave heating using silica fume as silica source and evaluated as adsorbents for the removal of Cu(2+), Pb(2+), and Cd(2+) from aqueous solutions. The effects of microwave heating times on the pore structure of the...

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Autores principales: Zhu, Wenjie, Wang, Jingxuan, Wu, Di, Li, Xitong, Luo, Yongming, Han, Caiyun, Ma, Wenhui, He, Sufang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5418173/
https://www.ncbi.nlm.nih.gov/pubmed/28476080
http://dx.doi.org/10.1186/s11671-017-2070-4
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author Zhu, Wenjie
Wang, Jingxuan
Wu, Di
Li, Xitong
Luo, Yongming
Han, Caiyun
Ma, Wenhui
He, Sufang
author_facet Zhu, Wenjie
Wang, Jingxuan
Wu, Di
Li, Xitong
Luo, Yongming
Han, Caiyun
Ma, Wenhui
He, Sufang
author_sort Zhu, Wenjie
collection PubMed
description Mesoporous silica materials (MSMs) of the MCM-41 type were rapidly synthesized by microwave heating using silica fume as silica source and evaluated as adsorbents for the removal of Cu(2+), Pb(2+), and Cd(2+) from aqueous solutions. The effects of microwave heating times on the pore structure of the resulting MSMs were investigated as well as the effects of different acids which were employed to adjust the solution pH during the synthesis. The obtained MCM-41 samples were characterized by nitrogen adsorption–desorption analyses, X-ray powder diffraction, and transmission electron microscopy. The results indicated that microwave heating method can significantly reduce the synthesis time of MCM-41 to 40 min. The MCM-41 prepared using citric acid (c-MCM-41(40)) possessed more ordered hexagonal mesostructure, higher pore volume, and pore diameter. We also explored the ability of c-MCM-41(40) for removing heavy metal ions (Cu(2+), Pb(2+), and Cd(2+)) from aqueous solution and evaluated the influence of pH on its adsorption capacity. In addition, the adsorption isotherms were fitted by Langmuir and Freundlich models, and the adsorption kinetics were assessed using pseudo-first-order and pseudo-second-order models. The intraparticle diffusion model was studied to understand the adsorption process and mechanism. The results confirmed that the as-synthesized adsorbent could efficiently remove the heavy metal ions from aqueous solution at pH range of 5–7. The adsorption isotherms obeyed the Langmuir model, and the maximum adsorption capacities of the adsorbent for Cu(2+), Pb(2+), and Cd(2+) were 36.3, 58.5, and 32.3 mg/g, respectively. The kinetic data were well fitted to the pseudo-second-order model, and the results of intraparticle diffusion model showed complex chemical reaction might be involved during adsorption process. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/s11671-017-2070-4) contains supplementary material, which is available to authorized users.
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spelling pubmed-54181732017-05-19 Investigating the Heavy Metal Adsorption of Mesoporous Silica Materials Prepared by Microwave Synthesis Zhu, Wenjie Wang, Jingxuan Wu, Di Li, Xitong Luo, Yongming Han, Caiyun Ma, Wenhui He, Sufang Nanoscale Res Lett Nano Express Mesoporous silica materials (MSMs) of the MCM-41 type were rapidly synthesized by microwave heating using silica fume as silica source and evaluated as adsorbents for the removal of Cu(2+), Pb(2+), and Cd(2+) from aqueous solutions. The effects of microwave heating times on the pore structure of the resulting MSMs were investigated as well as the effects of different acids which were employed to adjust the solution pH during the synthesis. The obtained MCM-41 samples were characterized by nitrogen adsorption–desorption analyses, X-ray powder diffraction, and transmission electron microscopy. The results indicated that microwave heating method can significantly reduce the synthesis time of MCM-41 to 40 min. The MCM-41 prepared using citric acid (c-MCM-41(40)) possessed more ordered hexagonal mesostructure, higher pore volume, and pore diameter. We also explored the ability of c-MCM-41(40) for removing heavy metal ions (Cu(2+), Pb(2+), and Cd(2+)) from aqueous solution and evaluated the influence of pH on its adsorption capacity. In addition, the adsorption isotherms were fitted by Langmuir and Freundlich models, and the adsorption kinetics were assessed using pseudo-first-order and pseudo-second-order models. The intraparticle diffusion model was studied to understand the adsorption process and mechanism. The results confirmed that the as-synthesized adsorbent could efficiently remove the heavy metal ions from aqueous solution at pH range of 5–7. The adsorption isotherms obeyed the Langmuir model, and the maximum adsorption capacities of the adsorbent for Cu(2+), Pb(2+), and Cd(2+) were 36.3, 58.5, and 32.3 mg/g, respectively. The kinetic data were well fitted to the pseudo-second-order model, and the results of intraparticle diffusion model showed complex chemical reaction might be involved during adsorption process. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/s11671-017-2070-4) contains supplementary material, which is available to authorized users. Springer US 2017-05-04 /pmc/articles/PMC5418173/ /pubmed/28476080 http://dx.doi.org/10.1186/s11671-017-2070-4 Text en © The Author(s). 2017 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Nano Express
Zhu, Wenjie
Wang, Jingxuan
Wu, Di
Li, Xitong
Luo, Yongming
Han, Caiyun
Ma, Wenhui
He, Sufang
Investigating the Heavy Metal Adsorption of Mesoporous Silica Materials Prepared by Microwave Synthesis
title Investigating the Heavy Metal Adsorption of Mesoporous Silica Materials Prepared by Microwave Synthesis
title_full Investigating the Heavy Metal Adsorption of Mesoporous Silica Materials Prepared by Microwave Synthesis
title_fullStr Investigating the Heavy Metal Adsorption of Mesoporous Silica Materials Prepared by Microwave Synthesis
title_full_unstemmed Investigating the Heavy Metal Adsorption of Mesoporous Silica Materials Prepared by Microwave Synthesis
title_short Investigating the Heavy Metal Adsorption of Mesoporous Silica Materials Prepared by Microwave Synthesis
title_sort investigating the heavy metal adsorption of mesoporous silica materials prepared by microwave synthesis
topic Nano Express
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5418173/
https://www.ncbi.nlm.nih.gov/pubmed/28476080
http://dx.doi.org/10.1186/s11671-017-2070-4
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