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Molecules 2017, 22(1), 173; doi:10.3390/molecules22010173

Adsorption Properties of Nano-MnO2–Biochar Composites for Copper in Aqueous Solution

1
College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China
2
Agro-Environmental Protection Institute, Ministry of Agriculture of China, Key Laboratory of Production Environment Quality, Ministry of Agriculture of China, Tianjin 300191, China
3
The New Zealand Institute for Plant and Food Research Limited, Private Bag 4704, Christchurch 8140, New Zealand
4
Liaoning Academy of Agriculture Science, Shenyang 110866, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editors: Thomas Farmer and James H. Clark
Received: 13 December 2016 / Revised: 9 January 2017 / Accepted: 13 January 2017 / Published: 20 January 2017
(This article belongs to the Special Issue Chemicals from Biomass)
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Abstract

There is a continuing need to develop effective materials for the environmental remediation of copper-contaminated sites. Nano-MnO2–biochar composites (NMBCs) were successfully synthesized through the reduction of potassium permanganate by ethanol in a biochar suspension. The physicochemical properties and morphology of NMBCs were examined, and the Cu(II) adsorption properties of this material were determined using various adsorption isotherms and kinetic models. The adsorption capacity of NMBCs for Cu(II), which was enhanced by increasing the pH from 3 to 6, was much larger than that of biochar or nano-MnO2. The maximum adsorption capacity of NMBCs for Cu(II) was 142.02 mg/g, which was considerably greater than the maximum adsorption capacities of biochar (26.88 mg/g) and nano-MnO2 (93.91 mg/g). The sorption process for Cu(II) on NMBCs fitted very well to a pseudo-second-order model (R2 > 0.99). Moreover, this process was endothermic, spontaneous, and hardly influenced by ionic strength. The mechanism of Cu(II) adsorption on NMBCs mainly involves the formation of complexes between Cu(II) and O-containing groups (e.g., COO–Cu and Mn–O–Cu). Thus, NMBCs may serve as effective adsorbents for various environmental applications, such as wastewater treatment or the remediation of copper-contaminated soils. View Full-Text
Keywords: biochar; nano-MnO2–biochar composites; adsorption; copper biochar; nano-MnO2–biochar composites; adsorption; copper
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Zhou, L.; Huang, Y.; Qiu, W.; Sun, Z.; Liu, Z.; Song, Z. Adsorption Properties of Nano-MnO2–Biochar Composites for Copper in Aqueous Solution. Molecules 2017, 22, 173.

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