A novel approach to developing a reusable marine macro-algae adsorbent with chitosan and ferric oxide for simultaneous efficient heavy metal removal and easy magnetic separation

[Display omitted] •Chi-KBm was synthesized using simple, effective and cost less procedures.•Chi-KBm achieved excellent Cu2+ removal from aqueous solution compared to KBm.•Nitrogen groups played a critical role to enhance Cu2+ removal efficiency.•Chi-KBm exhibited more than 99.8% separation efficien...

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Bibliographic Details
Published in:Bioresource technology 2018-07, Vol.259, p.381-387
Main Authors: Son, Eun-Bi, Poo, Kyung-Min, Mohamed, Hend Omar, Choi, Yun-Jeong, Cho, Wan-Cheol, Chae, Kyu-Jung
Format: Article
Language:English
Subjects:
Chitosan
Magnetic separation
Marine macro-algae biochar
Metal adsorption
Reusability
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Summary:[Display omitted] •Chi-KBm was synthesized using simple, effective and cost less procedures.•Chi-KBm achieved excellent Cu2+ removal from aqueous solution compared to KBm.•Nitrogen groups played a critical role to enhance Cu2+ removal efficiency.•Chi-KBm exhibited more than 99.8% separation efficiency with external magnet.•Chi-KBm is an effective heavy metals adsorbent with easy magnetic separation. Chitosan modified magnetic kelp biochar (Chi-KBm) was successfully synthesized for efficient removal of heavy metals (Cu2+) from wastewater. Interestingly, the characterization results indicated that Chi-KBm showed 6 times higher surface area (6.17 m2/g) than the pristine magnetic kelp biochar KBm (0.97 m2/g). In addition, new functional groups, such as NH and CN group, have been created on the surface of biochar as a result of chitosan modification process, which in turns led to improve the Cu2+ adsorption capacity. The effect of pH and chitosan loading on heavy metal adsorption, and competition reaction of different metal ions adsorption were also investigated. Chi-KBm exhibited a separation efficiency of more than 99.8%, which allows to recovery and reusability of the adsorbent material and heavy metals simultaneously. Overall, this study highlighted the Chi-KBm is a promise adsorbent for heavy metal removal without sacrificing of the separation ability using magnetism.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2018.03.077