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Separation Science and Technology Volume 54, 2019 - Issue 6
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Adsorption

Competitive adsorption of heavy metal ions (Pb2+, Cu2+, and Ni2+) onto date seed biochar: batch and fixed bed experiments

Zainab MahdiGriffith School of Engineering and Build Environment, Griffith University, Nathan, Queensland, AustraliaCorrespondence[email protected]
,
Qiming Jimmy YuGriffith School of Engineering and Build Environment, Griffith University, Nathan, Queensland, AustraliaORCID Iconhttp://orcid.org/0000-0002-5768-6133
ORCID Icon &
Ali El HanandehGriffith School of Engineering and Build Environment, Griffith University, Nathan, Queensland, Australia
Pages 888-901 | Received 30 May 2018, Accepted 10 Sep 2018, Published online: 01 Oct 2018
 
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ABSTRACT

In a multicomponent systems, the adsorption of Pb2+, Cu2+, and Ni2+ by date seed biochar exhibited competitive behavior. Compared to single component systems, the adsorption capacities of each ion were reduced by 48–75% in both batch and column experiments. Surface complexation with carboxyl and hydroxyl functional groups played a major role in the removal mechanism. Ion exchange mechanism accounted for 37–40% of the total adsorption compared to 57–72% in single component systems. Modified Langmuir isotherm best described the systems. Adsorption capacities and selectivity follow the order: Pb2+> Cu2+> Ni2+. Multi-stage sequences system is recommended to avoid premature exhaustion of biochar.

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