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  Preparation of montmorillonite modified biochar with various temperatures and their mechanism for Zn ion removal

Song, J., Zhang, S., Li, G., Du, Q., & Yang, F. (2020). Preparation of montmorillonite modified biochar with various temperatures and their mechanism for Zn ion removal. Journal of Hazardous Materials, 391: 121692. doi:10.1016/j.jhazmat.2019.121692.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-777C-A Version Permalink: http://hdl.handle.net/21.11116/0000-0006-7780-3
Genre: Journal Article

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 Creators:
Song, Jingpeng, Author
Zhang, Shuaishuai, Author
Li, Guixiang, Author
Du, Qing, Author
Yang, Fan1, Author              
Affiliations:
1NEAU-MPICI, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_3235412              

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Free keywords: Biochar, Montmorillonite, Zinc ion, Preparation temperature, Adsorption mechanism
 Abstract: Because of its layered structure, excellent adsorption, catalytic and ion exchange properties, strong passivation, and superior adsorption capacity for heavy metals, montmorillonite as biochar modifier was introduced. Montmorillonite modified biochar composites (BC-MNT) were successfully prepared by one-step hydrothermal progress and subsequent pyrolysis for the application of Zn (II) removal from aqueous solution. Herein, our research mainly explored the effect of different hydrothermal method/pyrolysis temperatures on the adsorption properties of montmorillonite-biochar composites, since that temperature can greatly change the surface functional groups and chemical composition and structure of biochar. Primarily, adopting VK analysis method analyzed raw biochar and montmorillonite modified biochar at different temperature condition. For further research, adsorption mechanism was realized by means of SEM-EDS, XRD, FTIR, and XPS, as concluded that electrostatic interaction between the negative charge of the interlayers and Zn (II) and surface complexation took up a dominant role. The kinetic and isothermal adsorption mathematical model fitting were also performed, which was more suitable for pseudo-second order and Freundlich model, suggesting that the limited speed stage was dominated by chemical forces. The optimal preparation temperature (350 °C) and maximum adsorption amount (8.163 mg·g−1) were determined by the adsorption experiment model.

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Language(s): eng - English
 Dates: 2019-11-152020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1016/j.jhazmat.2019.121692
Other: Fan um PDF gebeten, 02-06-2020 SN
 Degree: -

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Title: Journal of Hazardous Materials
  Other : J. Hazard. Mater.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 391 Sequence Number: 121692 Start / End Page: - Identifier: ISSN: 0304-3894