MgAl Layered Double Hydroxides Intercalated with EDTA: Cu(II) Recovery and Mechanism

Abstract

In water treatment, it is a valid way to remove Cu(II) efficiently via layered double hydroxides (LDHs) intercalated with chelate, but the desorption and its mechanism remain an unsolved difficult problem. To solve this problem, MgAl LDHs intercalated with EDTA (MgAl-EDTA-LDHs) was synthesized by onestep co-precipitation method, and applied to recover Cu 2 +. The characterizations of SEM, XRD, XPS, EA and AAS were employed, and the results showed that MgAl-EDTA-LDHs exhibited a typical lamellar structure, the adsorption capacity of MgAl-EDTA-LDHs on Cu 2 + could reach 79.69 mg/g, which was attributed to the chelation of EDTA and chemical bonding of hydroxyl (À OH) on the surface of LDHs layers. In addition, the adsorption capacity could achieve 45.75 mg/g after eluting by Na 2 CO 3 solution, which was relevant to the ion exchange by CO 3 2À. Herein, the adsorption and desorption mechanism of MgAl-EDTA-LDHs on Cu 2 + was expounded, which may pave a new way to recover the heavy metal and provide a theoretical guidance for future research.

Design and preparation of a novel Mg–Al LDH@EDTA-Melamine nanocomposite for effective adsorptive removal of methylene blue and rhodamine B dyes from water

“…00-002-0164), and the peaks at 2θ angles of 10.942° (101), 22.316° (202) 53.361° (131), and 57.205° (113), attributed to EDTA (JCPDS card No. 00-046-1614), indicate the presence of EDTA-MA between the Mg–Al LDH layers, confirming the successful synthesis of the nanocomposite [ 80 ].

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Layered Double Hydroxide/Graphene Quantum Dots as a New Sorbent for the Dispersive Solid-Phase Microextraction of Selected Benzophenones, Phenols, and Parabens

“…In Figure 2 , the XRD spectra of the bare LDH and the composite material can be seen. Diffraction peaks at 11°, 22°, and 35° can be seen, which correspond to the (003), (006), and (009) planes of the Mg-Al LDH, suggesting a crystallized hydrotalcite structure [ 44 , 45 ]. In the XRD spectrum of the composite material, a broader peak at around 20 o can be seen, suggesting the addition of the GQDs in the structure of the LDH [ 46 ].…”

A Highly Efficient Environmental-Friendly Adsorbent Based on Schiff Base for Removal of Cu(II) from Aqueous Solutions: A Combined Experimental and Theoretical Study

“…A suitable method is thus needed for removing and selectively recovering Cu(II) from drinkable water. Currently, several remediation approaches and techniques have been applied to capture Cu(II) ions, such as ion exchange [ 4 ], coagulation [ 5 ], liquid-phase extraction [ 6 ], membrane separation [ 7 ], electrodeposition [ 8 ] and reverse osmosis [ 9 ].…”