Fabrication of porosity-enhanced MgO/biochar for removal of phosphate from aqueous solution: Application of a novel combined electrochemical modification method

[Display omitted] •This study introduced a novel combined electrochemical modification (CEM) method.•MgO nanocomposites were uniformly dispersed within a PE-MgO/biochar surface.•The CEM method showed synergetic effect on phosphate adsorption capacity.•PE-MgO/biochar showed the highest phosphate remo...

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Bibliographic Details
Published in:Bioresource technology 2016-01, Vol.200, p.1029-1032
Main Authors: Jung, Kyung-Won, Ahn, Kyu-Hong
Format: Article
Language:English
Subjects:
Adsorption
Adsorption isotherm
Biochar
Charcoal
Electrochemical Techniques
Electrodes
Magnesium Chloride - chemistry
Magnesium Oxide - chemistry
Marine macroalgae
MgO
Phosphate
Phosphates - isolation & purification
Porosity
Seaweed - chemistry
Solutions - chemistry
Water Pollutants, Chemical - isolation & purification
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Summary:[Display omitted] •This study introduced a novel combined electrochemical modification (CEM) method.•MgO nanocomposites were uniformly dispersed within a PE-MgO/biochar surface.•The CEM method showed synergetic effect on phosphate adsorption capacity.•PE-MgO/biochar showed the highest phosphate removal efficiency.•The Langmuir–Freundlich model fitted the phosphate adsorption isotherm well. A novel combined electrochemical modification (CEM) method, using a graphite electrode-based electric field and MgCl2 as electrolyte, was newly developed to prepare porosity-enhanced biochar containing periclase (MgO) nanocomposites (PE-MgO/biochar). During the CEM method, the dried marine macroalgae was immersed in the MgCl2 solution, and a voltage of 20V was then applied for 10min prior to pyrolysis. Morphological and chemical analyses results showed that nano-sized MgO particles with a highly crystalline structure were dispersed and enriched on the surface of the PE-MgO/biochar, which enabled higher phosphate adsorption capability. In an adsorption equilibrium test, among various biochars, PE-MgO/biochar exhibited the highest phosphate adsorption capacity from aqueous solution with a Langmuir–Freundlich maximum adsorption capacity as high as 620mg-Pg−1. It can be concluded that the newly introduced CEM method is a potent additional technique to effectively prepare modified-biochar in terms of a simple and time-saving modification method.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2015.10.008