Hydrothermal synthesis of hierarchically structured birnessite-type MnO2/biochar composites for the adsorptive removal of Cu(II) from aqueous media

Kyung Won Jung; Seon Yong Lee; Young Jae Lee

doi:10.1016/j.biortech.2018.03.125

Hydrothermal synthesis of hierarchically structured birnessite-type MnO₂/biochar composites for the adsorptive removal of Cu(II) from aqueous media

Kyung Won Jung, Seon Yong Lee, Young Jae Lee

Department of Earth and Environmental Sciences

Research output: Contribution to journal › Article › peer-review

75 Citations (Scopus)

Abstract

In this study, hierarchical birnessite-type MnO₂/biochar composites (δ-MnO₂/BCs) were synthesized by a hydrothermal technique, and their Cu(II) removal performance was examined in aqueous solution. Morphological characterization confirmed that a three-dimensional flower-like structure of δ-MnO₂ was formed, which results in effective adsorption affinity towards Cu(II). The effects of solution pH, adsorbent dosage, and ionic strength on the adsorption behavior of the prepared materials were systemically investigated. The adsorption kinetics indicated that Cu(II) adsorption onto δ-MnO₂/BCs follows a pseudo-second-order model. Analysis of possible adsorption/diffusion mechanisms suggested that the adsorption process is controlled by both film and pore diffusion. The adsorption isotherms fit closely to the Sips isotherm model, and the theoretical maximum adsorption capacities of Cu(II) on the synthesized δ-MnO₂/BCs are approximately 124, 154, 199, and 230 mg/g at 15, 25, 35, and 45 °C, respectively. Adsorption-desorption studies demonstrated the recyclability of the δ-MnO₂/BCs for the removal of Cu(II) from aqueous solutions.

Original language	English
Pages (from-to)	204-212
Number of pages	9
Journal	Bioresource technology
Volume	260
DOIs	https://doi.org/10.1016/j.biortech.2018.03.125
Publication status	Published - 2018 Jul

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea ( NRF ), South Korea grant funded by the Korea government ( MSIP ), South Korea (No. 2017R1A2B4008454 ) and Korea Ministry of Environment ( MOE ), South Korea as Advanced Industrial Technology Development Project (No. 2017000140010 ).

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF), South Korea grant funded by the Korea government (MSIP), South Korea (No. 2017R1A2B4008454) and Korea Ministry of Environment (MOE), South Korea as Advanced Industrial Technology Development Project (No. 2017000140010).

Publisher Copyright:
© 2018 Elsevier Ltd

Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.

Keywords

Adsorption
Biochar composites
Birnessite
Copper
Manganese oxides

ASJC Scopus subject areas

Bioengineering
Environmental Engineering
Renewable Energy, Sustainability and the Environment
Waste Management and Disposal

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.biortech.2018.03.125

Cite this

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title = "Hydrothermal synthesis of hierarchically structured birnessite-type MnO2/biochar composites for the adsorptive removal of Cu(II) from aqueous media",

abstract = "In this study, hierarchical birnessite-type MnO2/biochar composites (δ-MnO2/BCs) were synthesized by a hydrothermal technique, and their Cu(II) removal performance was examined in aqueous solution. Morphological characterization confirmed that a three-dimensional flower-like structure of δ-MnO2 was formed, which results in effective adsorption affinity towards Cu(II). The effects of solution pH, adsorbent dosage, and ionic strength on the adsorption behavior of the prepared materials were systemically investigated. The adsorption kinetics indicated that Cu(II) adsorption onto δ-MnO2/BCs follows a pseudo-second-order model. Analysis of possible adsorption/diffusion mechanisms suggested that the adsorption process is controlled by both film and pore diffusion. The adsorption isotherms fit closely to the Sips isotherm model, and the theoretical maximum adsorption capacities of Cu(II) on the synthesized δ-MnO2/BCs are approximately 124, 154, 199, and 230 mg/g at 15, 25, 35, and 45 °C, respectively. Adsorption-desorption studies demonstrated the recyclability of the δ-MnO2/BCs for the removal of Cu(II) from aqueous solutions.",

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author = "Jung, {Kyung Won} and Lee, {Seon Yong} and Lee, {Young Jae}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea ( NRF ), South Korea grant funded by the Korea government ( MSIP ), South Korea (No. 2017R1A2B4008454 ) and Korea Ministry of Environment ( MOE ), South Korea as Advanced Industrial Technology Development Project (No. 2017000140010 ). Funding Information: This work was supported by the National Research Foundation of Korea (NRF), South Korea grant funded by the Korea government (MSIP), South Korea (No. 2017R1A2B4008454) and Korea Ministry of Environment (MOE), South Korea as Advanced Industrial Technology Development Project (No. 2017000140010). Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd Copyright: Copyright 2018 Elsevier B.V., All rights reserved.",

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AU - Jung, Kyung Won

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AU - Lee, Young Jae

N1 - Funding Information: This work was supported by the National Research Foundation of Korea ( NRF ), South Korea grant funded by the Korea government ( MSIP ), South Korea (No. 2017R1A2B4008454 ) and Korea Ministry of Environment ( MOE ), South Korea as Advanced Industrial Technology Development Project (No. 2017000140010 ). Funding Information: This work was supported by the National Research Foundation of Korea (NRF), South Korea grant funded by the Korea government (MSIP), South Korea (No. 2017R1A2B4008454) and Korea Ministry of Environment (MOE), South Korea as Advanced Industrial Technology Development Project (No. 2017000140010). Publisher Copyright: © 2018 Elsevier Ltd Copyright: Copyright 2018 Elsevier B.V., All rights reserved.

PY - 2018/7

Y1 - 2018/7

N2 - In this study, hierarchical birnessite-type MnO2/biochar composites (δ-MnO2/BCs) were synthesized by a hydrothermal technique, and their Cu(II) removal performance was examined in aqueous solution. Morphological characterization confirmed that a three-dimensional flower-like structure of δ-MnO2 was formed, which results in effective adsorption affinity towards Cu(II). The effects of solution pH, adsorbent dosage, and ionic strength on the adsorption behavior of the prepared materials were systemically investigated. The adsorption kinetics indicated that Cu(II) adsorption onto δ-MnO2/BCs follows a pseudo-second-order model. Analysis of possible adsorption/diffusion mechanisms suggested that the adsorption process is controlled by both film and pore diffusion. The adsorption isotherms fit closely to the Sips isotherm model, and the theoretical maximum adsorption capacities of Cu(II) on the synthesized δ-MnO2/BCs are approximately 124, 154, 199, and 230 mg/g at 15, 25, 35, and 45 °C, respectively. Adsorption-desorption studies demonstrated the recyclability of the δ-MnO2/BCs for the removal of Cu(II) from aqueous solutions.

AB - In this study, hierarchical birnessite-type MnO2/biochar composites (δ-MnO2/BCs) were synthesized by a hydrothermal technique, and their Cu(II) removal performance was examined in aqueous solution. Morphological characterization confirmed that a three-dimensional flower-like structure of δ-MnO2 was formed, which results in effective adsorption affinity towards Cu(II). The effects of solution pH, adsorbent dosage, and ionic strength on the adsorption behavior of the prepared materials were systemically investigated. The adsorption kinetics indicated that Cu(II) adsorption onto δ-MnO2/BCs follows a pseudo-second-order model. Analysis of possible adsorption/diffusion mechanisms suggested that the adsorption process is controlled by both film and pore diffusion. The adsorption isotherms fit closely to the Sips isotherm model, and the theoretical maximum adsorption capacities of Cu(II) on the synthesized δ-MnO2/BCs are approximately 124, 154, 199, and 230 mg/g at 15, 25, 35, and 45 °C, respectively. Adsorption-desorption studies demonstrated the recyclability of the δ-MnO2/BCs for the removal of Cu(II) from aqueous solutions.

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