Issue 21, 2025, Issue in Progress

A novel Araucaria gum/carrageenan/Mg–Fe LDH nanocomposite for advanced batch and fixed-bed adsorption of mercuric ions from aqueous medium

Abstract

In the present work, several meticulously planned batch and fixed-bed adsorption experiments were performed to compare the adsorption capacities of the synthesized magnesium-ferric layered double hydroxide (Mg–Fe LDH, MFL), carrageenan/Mg–Fe LDH nanocomposite (MFC), and Araucaria gum/carrageenan/Mg–Fe LDH nanocomposite (MFAC) for mercuric ion removal from aqueous medium. Various physicochemical approaches were conducted to characterize the fabricated adsorbents, proving the successful incorporation of potassium κ-carrageenan and Araucaria gum on the LDH surface. The relatively greater particle size (130 nm), irregular pore distribution, average pore radius (3.2086 nm), and pHPZC (6.25) of MFAC were mainly responsible for its superior Hg2+ adsorption. Through a series of batch adsorption tests, Hg2+ adsorption on the MFAC nanocomposite exhibited a maximum adsorption capacity of 505.74 mg g−1 at 20 °C, pH 6, and a solid dosage of 2 g L−1 after 30 min. Several kinetics and isotherms were well-fitted for the adsorption process. Fixed-bed column tests proved that MFAC achieved 550.50 mg g−1 at a bed height of 1 cm, a Hg2+ solution concentration of 80 mg L−1, and a flow rate of 30 mL min−1 at 20 °C and pH 6 over 300 min. Thus, MFAC can be efficiently applied in wastewater treatment, offering major support for further research into practical applications.

Graphical abstract: A novel Araucaria gum/carrageenan/Mg–Fe LDH nanocomposite for advanced batch and fixed-bed adsorption of mercuric ions from aqueous medium

Article information

Article type
Paper
Submitted
24 Mar 2025
Accepted
08 May 2025
First published
20 May 2025
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2025,15, 16901-16920

A novel Araucaria gum/carrageenan/Mg–Fe LDH nanocomposite for advanced batch and fixed-bed adsorption of mercuric ions from aqueous medium

W. A. Shaltout, H. Hafez, M. S. Elsayed and A. F. Hassan, RSC Adv., 2025, 15, 16901 DOI: 10.1039/D5RA02081F

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