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Separation Science and Technology Volume 54, 2019 - Issue 18
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Adsorption

Removal of Pb(ii) ions from aqueous solution using a novel composite adsorbent of Fe3o4/PVA/spent coffee grounds

Van Thuan LeCenter for Advanced Chemistry, Institute of Research & Development, Duy Tan University, Danang city, Vietnam;Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Hanoi, Vietnam;Center for High Technology Development, Vietnam Academy of Science and Technology, Hanoi, VietnamView further author information
,
Thanh Minh PhamDeparment of Biology and Chemistry, Belgorod State National Research University, Belgorod, Russia;Center of Research and Radioisotope Production, Nuclear Research Institute, Dalat, VietnamView further author information
,
Van Dat DoanFaculty of Chemical Engineering, Industrial University of Ho Chi Minh city, Ho Chi Minh city, VietnamView further author information
,
Olga Evgenyevna LebedevaDeparment of Biology and Chemistry, Belgorod State National Research University, Belgorod, RussiaView further author information
&
Hoai Thuong NguyenDivision of Computational Physics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam;Faculty of Electrical & Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, VietnamCorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0003-1290-5221View further author information
ORCID Icon
Pages 3070-3081 | Received 23 Feb 2018, Accepted 10 Dec 2018, Published online: 17 Jan 2019
 
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ABSTRACT

A novel magnetic composite prepared from Fe3O4, poly(vinyl alcohol) and alkaline pretreated spent coffee grounds (Fe3O4/PVA/APSCGs) was utilized for the first time as an adsorbent for adsorption of Pb(II) ions after carefully characterizing it by various techniques (XRD, FTIR, SEM, EDX). The obtained results indicated that the adsorption was spontaneous, endothermic, fitting well with both Langmuir and Freundlich models, and more suitable to be described by the second-order kinetic model. The maximum adsorption capacity of Fe3O4/PVA/APSCGs for Pb(II) at optimum conditions (pH of 5, contact time of 24 h, APSCGs:Fe3O4 weight ratio of 4:1) was found to be 0.275 mmol.g−1. Recycling study showed a good reusability of the composite with removal efficiency maintained at 78.12% after five continuous adsorption-desorption cycles.

Additional information

Funding

This research is funded by Graduate University of Science and Technology under grant number GUST.STS.ĐT2017-KHVL02.

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