Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 26, Issue 12, Pages 11524-11530Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-1497-1
Keywords
Ball mill; Biochar; Sodium alginate; Methylene blue; Wastewater; Adsorption
Categories
Funding
- National Key Research and Development Program of China [2016YFC0502602]
- National Science Foundation of China [U1612441]
- Key Agriculture R&D Program of Guizhou Province (NZ) [NZ [2013] 3012]
- International Scientific and Technological Cooperation Project of Guizhou Province [G[2012]7050]
- Dawn of West China Talent Training Program of the Chinese Academy of Sciences [[2012]179]
- Opening Fund of State Key Laboratory of Environmental Geochemistry [SKLEG2018907]
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In this work, a novel composite, ball-milled biochar (BMB) encapsulated in calcium-alginate (CA) beads (CA-BMB), was synthesized as an alternative adsorbent for the removal of methylene blue (MB) from an aqueous solution. Sorption performance was compared among CA, BMB, and CA-BMB composite with batch adsorption experiments. With 25% BMB and 75% alginate, the new composite resembled CA in MB adsorption. With an initial MB concentration of 50mgL(-1), kinetics studies showed that 74% MB removal by CA-BMB was achieved within 8h, followed by slow kinetics reaching 91% removal in 16h. The adsorption kinetics was well explained by the Ritchie's kinetic model, indicative of energetically heterogeneous solid surface of the composite. Adsorption isotherms of BMB, CA, and CA-BMB can all be fitted with the Langmuir models; the adsorption capacity of CA-BMB (1210.7mgg(-1)) was close to that of CA (1282.2mgg(-1)) and much higher than that of BMB alone (184.1mgg(-1)). The outstanding adsorption performance suggested that CA-BMB can serve as a low-cost and eco-friendly adsorbent for MB removal from an aqueous solution.
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