One-step hydrothermal synthesis of a green NiCo-LDHs-rGO composite for the treatment of lead ion in aqueous solutions

Ata, Makarem, Aldaghi, Alireza, Gheibi, Mohammad, Eftekhari, Mohammad and Behzadian, Kourosh ORCID: (2023) One-step hydrothermal synthesis of a green NiCo-LDHs-rGO composite for the treatment of lead ion in aqueous solutions. The Canadian Journal of Chemical Engineering. ISSN 0008-4034

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In this study,, we have synthesised a microspherical nickel-cobalt-layered double hydroxides-reduced graphene oxide composite (NiCo-LDHs-rGO) through a one-step hydrothermal method. We subsequently used this composite as an adsorbent to remove Pb2+ from aqueous solutions. The instruments used for the characterisation of adsorbent included Fourier Transform Infrared Spectrophotometry (FT-IR), Field Emission Scanning Electron Microscopy (FESEM), Mapping Elemental Analysis, Electron Dispersive X-Ray spectroscopy (EDX), X-Ray Diffraction Analysis (XRD) and Brunauer-Emmett-Teller (BET)analysis. We conducted a series of experiments to investigate the factors affecting the adsorption of Pb2+ ions in batch mode such as solution pH, adsorbent dosage, contact time, competing ion and regeneration by NiCo-LDHs-rGO. Under optimised conditions determined using the Taguchi method (pH = 5.0, adsorbent dosage = 20 mg and contact time = 30 min), the best removal rate of 99.7% was achieved for 100 mg L-1 of Pb2+. According to the results, NiCo-LDHs-rGO exhibited a high preference for Pb2+ over Cu2+, Zn2+ and Cd2+. This adsorbent was regenerated for several cycles (using 0.01 M HCl) with no significant deterioration in performance. The analyses of the adsorption isotherm models revealed that the adsorption of Pb2+ followed Freundlich isotherm with a maximum adsorption capacity of 200 mg g-1. The kinetic data also confirmed that pseudo second order kinetic equation is the most accurate model for predicting the adsorption kinetics. Furthermore, the Simulink modelling illustrated that the adsorption kinetics of Pb2+ onto NiCo-LDHs-rGO could be accurately represented in a continuous stirred-tank reactor. Finally, dual interactions of the effective parameters can be modelled by polynomial equations in MATLAB, and according to the Taguchi model, pH emerged as the most influential factor among all the parameters.

Item Type: Article
Identifier: 10.1002/cjce.25115
Keywords: Nickel cobalt layered double hydroxides particles-reduced graphene oxide (NiCo-LDHs-rGO), Lead ion removal, Water treatment
Subjects: Construction and engineering
Depositing User: Kourosh Behzadian
Date Deposited: 16 Oct 2023 10:37
Last Modified: 06 Feb 2024 16:17


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