Abstract:PVP–Fe3O4 NPs synthesized with no organic solvents, low toxicity reactants and low temperature/energy requirements could remove Cd, Cr, Ni, Pb efficiently in the different synthetic water media under environmentally relevant conditions.
“…The removal efficiency of Ni (II) was greater than Pb (II) because the nickel ions had higher affinity towards the adsorbent [ 44 ]. This may be due to differences in molecular mass, ion charges, ionic radius, hydration energy, and electrostatic forces of the metal ions [ 8 , 64 ]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…It can be accumulated and adsorbed by the body through inhalation, ingestion, skin contact and transfer through the placenta [ 1 , 3 ]. Long-term exposure of lead to children, not only impacts their biological systems, but also has long-term effects, such as damage to central nervous system and chronic respiratory diseases [ [8] , [9] , [10] ].…”
Highlights
Removal efficiency of 89.31 % (Pb) and 96.33 % (Ni) by sugarcane bagasse.
Optimum pH 6.0; temperature, 30 °C; contact time, 90 min. and adsorbent dose of 0.5 g.
Fitted by Freundlich and pseudo-second-order models.
Adsorption capacity of 1.61 mg/g (Pb) and 123.46 mg/g (Ni).
Desorption efficiency of 85.2 % by nitric acid.
“…The removal efficiency of Ni (II) was greater than Pb (II) because the nickel ions had higher affinity towards the adsorbent [ 44 ]. This may be due to differences in molecular mass, ion charges, ionic radius, hydration energy, and electrostatic forces of the metal ions [ 8 , 64 ]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…It can be accumulated and adsorbed by the body through inhalation, ingestion, skin contact and transfer through the placenta [ 1 , 3 ]. Long-term exposure of lead to children, not only impacts their biological systems, but also has long-term effects, such as damage to central nervous system and chronic respiratory diseases [ [8] , [9] , [10] ].…”
Highlights
Removal efficiency of 89.31 % (Pb) and 96.33 % (Ni) by sugarcane bagasse.
Optimum pH 6.0; temperature, 30 °C; contact time, 90 min. and adsorbent dose of 0.5 g.
Fitted by Freundlich and pseudo-second-order models.
Adsorption capacity of 1.61 mg/g (Pb) and 123.46 mg/g (Ni).
Desorption efficiency of 85.2 % by nitric acid.
“…Finally, based on previous literature findings 49,55–57 it is expected that the anchoring of pre‐functionalized, double‐layer OA‐coated Fe 3 O 4 NPs will further enhance the adsorption capacity of the nanofibrous adsorbents.…”
Magnetoactive electrospun fibrous membranes consisting of polyvinylpyrrolidone (PVP), chitosan (CS) and pre‐fabricated, double‐layer oleic acid‐coated magnetite nanoparticles (OA.OA.Fe3O4) were fabricated and evaluated as new adsorbent materials for the removal and recovery of uranium (U(VI)) from aqueous solutions. The adsorption has been investigated by batch‐type experiments and the solid material has been characterized by X‐ray diffraction spectroscopy (XRD), Fourier‐transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy/energy dispersive X‐ray analysis (TEM/EDX) and vibration sample magnetometry (VSM) measurements prior and after uranium adsorption. The experimental adsorption data were found to be well fitted with the Langmuir isotherm and the pseudo‐second order kinetic model. The results indicate that PVP/CS/OA.OA.Fe3O4 fibrous adsorbents exhibit good adsorption properties towards U(VI) in aqueous solutions, achieving a qmax value of 0.77 mol kg−1 (183.3 mg g−1) at pH 6.0. The experiments regarding the regeneration and reuse of the magnetoactive adsorbents were carried out using Na2CO3, at pH ~11. After four cycles, the percentage relative adsorption remained stable (~100%) whereas the desorption percentage decreased from 31.9% to 21.0%. Generally, the presented results demonstrate that the incorporation of the Fe3O4 NPs has a positive effect on the adsorption efficiency of U(VI) from aquatic environments.
“…Therefore, one of the most promising technology for the elimination or remediation of Pb and Cr, heavy metals from fly ash aqueous solution is nanotechnology [16,17]. Due to the unique physical and chemical properties of nanoparticles at nanoscale [18], they are widely used for wastewater treatment [19] and environmental clean-up [20].…”
Nanoparticles have gained huge attention in the last decade due to their applications in electronics, medicine, and environmental clean-up. Iron oxide nanoparticles (IONPs) are widely used for the wastewater treatment due to their recyclable nature and easy manipulation by an external magnetic field. Here, in the present research work, iron oxide nanoparticles were synthesized by the sonochemical method by using precursors of ferrous sulfate and ferric chloride at 70 °C for one hour in an ultrasonicator. The synthesized iron oxide nanoparticles were characterized by diffraction light scattering (DLS), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), electron diffraction spectroscopy (EDS), high-resolution transmission electron microscopy (HRTEM) and vibrating sample magnetometer (VSM). The FTIR analysis exhibits characteristic absorption bands of IONPs at 400–800 cm−1, while the Raman spectra showed three characteristic bands at 273, 675, and 1379 cm−1 for the synthesized IONPs. The XRD data revealed three major intensity peaks at two theta, 33°, 35°, and 64° which indicated the presence of maghemite and magnetite phase. The size of the spherical shaped IONPs was varying from 9–70 nm with an average size of 38.9 nm while the size of cuboidal shaped particle size was in microns. The purity of the synthesized IONPs was confirmed by the EDS attached to the FESEM, which clearly show sharp peaks for Fe and O, while the magnetic behavior of the IONPs was confirmed by the VSM measurement and the magnetization was 2.43 emu/g. The batch adsorption study of lead (Pb) and chromium (Cr) from 20% fly ash aqueous solutions was carried out by using 0.6 mg/100 mL IONPs, which exhibited maximum removal efficiency i.e., 97.96% and 82.8% for Pb2+ and Cr ions, respectively. The fly ash are being used in making cements, tiles, bricks, bio fertilizers etc., where the presence of fly ash is undesired property which has to be either removed or will be brought up to the value of acceptable level in the fly ash. Therefore, the synthesized IONPs, can be applied in the elimination of heavy metals and other undesired elements from fly ash with a short period of time. Moreover, the IONPs that have been used as a nanoadsorbent can be recovered from the reaction mixture by applying an external magnetic field that can be recycled and reused. Therefore, this study can be effective in all the fly ash-based industries for elimination of the undesired elements, while recyclability and reusable nature of IONPs will make the whole adsorption or elimination process much economical.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
