Synthesis, characterization, and application of nickel oxide/CNT nanocomposites to remove Pb2+ from aqueous solution

Abstract

In this study, the efficiency of nickel oxide/carbon nanotube (NiO/CNT) nanocomposite to remove Pb 2? from aqueous solution is investigated. NiO/CNT nanocomposite was prepared using the direct coprecipitation method in an aqueous media in the presence of CNTs. Samples were characterized using simultaneous thermal analysis (STA), X-ray diffraction (XRD), filed emission scanning electron microscopy (FESEM), and BrunauerEmmett-Teller (BET). To optimize the adsorption of Pb 2?ions on NiO/CNT nanocomposite, the effects of different parameters including pH, contact time, initial concentration of Pb 2? , and adsorbent mass-were also investigated. The optimum Pb 2? removal efficiency on NiO/CNT nanocomposite is achieved under experimental conditions of pH 7, contact time of 10 min, initial Pb 2? concentration of 20 ppm, and adsorbent mass of 0.1 g. The experimental data showed that the Pb 2? ions adsorption of NiO/CNT nanocomposite was through a Freundlich isotherm model rather than a Langmuir model. The kinetic data of adsorption of Pb 2? ions on the adsorbent was perfectly shown by a pseudo-second-order equation, to indicate their chemical adsorption. Thermodynamic parameters such as DG°, DH°, and DS°were also measured; the obtained values showed that the adsorption was basically spontaneous and endothermic.

Novel Cellulose Derivatives Containing Metal (Cu, Fe, Ni) Oxide Nanoparticles as Eco-Friendly Corrosion Inhibitors for C-Steel in Acidic Chloride Solutions

“…where Dnm represents the crystal size (in nm), k = 0.890 represents the constant of Scherrer, λ = 0.15425 nm symbolizes the wavelength of X-ray, β characterizes the complete thickness at a partial maximum of the band (FWHM), and θ represents the Bragg angle [54].…”

“…where D nm represents the crystal size (in nm), k = 0.890 represents the constant of Scherrer, λ = 0.15425 nm symbolizes the wavelength of X-ray, β characterizes the complete thickness at a partial maximum of the band (FWHM), and θ represents the Bragg angle [54]. Figure 2 demonstrates the crystallographic behavior of the PAC, PAC/NiONPs, PAC/CuONPs, and PAC/Fe 3 O 4 NPs, correspondingly.…”

Porous carbons prepared from a novel hard wood composite waste for effective adsorption of Pb(ii) and Cd(ii) ions

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“…Rahal et al, 2017). With the advent of magnetic nanotechnology, small magnetic materials are made with improved magnetic properties (Navaei Diva et al, 2017). The main applications of magnetic nanomaterials are using in the construction of data storage mediums, small electric motors, and magnetic nanofluids (Noori and Gholizadeh, 2019;Esmaili and Gholizadeh, 2020).…”