Journal
BIORESOURCE TECHNOLOGY
Volume 211, Issue -, Pages 108-116Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.03.066
Keywords
Marine macroalgae; Laminaria japonica; Pyrolysis; Biochar; Calcium-alginate beads; Phosphate
Funding
- National Research Council of Science and Technology [Asia-02-002]
- National Research Foundation of Korea [2009-0092795] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this work, granular biochar, Laminaria japonica-derived biochar (LB)-calcium alginate beads (LB-CAB), was successfully prepared by dropping a mixture of powder biochar and alginate solution into a calcium chloride solution for phosphate adsorption. Among different marine macroalgae derived biochars, LB exhibited the best performance, showing a phosphate removal rate of 97.02%, which was attributed to its high Ca/P and Mg/P ratios. With increasing pyrolysis temperature up to 600 degrees C, the physicochemical properties of LB became suitable for adsorbing phosphate. Experimental results of kinetics and equilibrium isotherms at different temperatures (10-30 degrees C) showed that the phosphate adsorption process is endothermic and is mainly controlled by external mass transfer and the intraparticle diffusion rate. The maximum adsorption capacity was found to be 157.7 mg g(-1) at 30 degrees C, as fitted by the Langmuir-Freundlich model, which is higher than capacities of other powder form of biochars. (C) 2016 Elsevier Ltd. All rights reserved.
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