Issue 48, 2021, Issue in Progress
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RSC Advances

Layered zinc hydroxide as an adsorbent for phosphate removal and recovery from wastewater†

Dema A. Almasri, ORCID logo *a   Rachid Essehli,*b   Yongfeng Tonga  and  Jenny Lawlera  

* Corresponding authors

a Qatar Environment and Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), Qatar Foundation, P. O. Box 34110, Doha, Qatar
E-mail: delmasri@hbku.edu.qa

b Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37932, USA
E-mail: essehlir@ornl.gov

Abstract

At present, phosphate removal and recovery from wastewater is gaining wide attention due to the dual issues of eutrophication, caused by the increased production of algae, and universal phosphorus scarcity. In this study, a layered zinc hydroxide (LZH) was synthesized by a simple precipitation method and characterized via various techniques. Experiments investigating the effect of contact time, pH, LZH dose, initial phosphate concentration, and co-existing ions on phosphate adsorption were conducted. LZH exhibited a high phosphate adsorption capacity (135.4 mg g−1) at a neutral pH. More than 50% of phosphate was removed within the first 60 s of contact time at an initial phosphate concentration of 5 mg L−1. Phosphate removal using the as-prepared LZH adsorbent was also tested in real treated sewage effluent reducing the residual phosphate amount to levels inhibiting to the growth of algae. Furthermore, phosphate desorption from LZH was investigated using acetic acid and sodium hydroxide regenerants which showed to be very effective for phosphate recovery.

Graphical abstract: Layered zinc hydroxide as an adsorbent for phosphate removal and recovery from wastewater

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Article information

DOI
https://doi.org/10.1039/D1RA04279C
Article type
Paper
Submitted
02 Jun 2021
Accepted
31 Aug 2021
First published
10 Sep 2021
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2021,11, 30172-30182

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Layered zinc hydroxide as an adsorbent for phosphate removal and recovery from wastewater

D. A. Almasri, R. Essehli, Y. Tong and J. Lawler, RSC Adv., 2021, 11, 30172 DOI: 10.1039/D1RA04279C

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