TY - JOUR
T1 - Hydrothermal synthesis of hierarchically structured birnessite-type MnO2/biochar composites for the adsorptive removal of Cu(II) from aqueous media
AU - Jung, Kyung Won
AU - Lee, Seon Yong
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.
KW - Adsorption
KW - Biochar composites
KW - Birnessite
KW - Copper
KW - Manganese oxides
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U2 - 10.1016/j.biortech.2018.03.125
DO - 10.1016/j.biortech.2018.03.125
M3 - Article
C2 - 29626779
AN - SCOPUS:85044965632
VL - 260
SP - 204
EP - 212
JO - Bioresource Technology
JF - Bioresource Technology
SN - 0960-8524
ER -
