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• W2742291446 abstract "Abstract L-Cysteine functionalized magnetite nanoparticles (L-Cyst-Fe 3 O 4 NPs) were synthesized by chemical co-precipitation using Fe 2+ and Fe 3+ as iron precursors, sodium hydroxide as a base and L-Cysteine as functionalized agent. The structural and morphological studies were carried out using X-ray powder diffraction, transmission electron microscopy, dynamic light scattering, scanning electron microscopy and energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, and UV-Vis spectrophotometric techniques. The zeta potential of bare Fe 3 O 4 and functionalized L-Cyst-Fe 3 O 4 NPs were +28 mV and −30.2 mV (pH 7.0), respectively. The positive surface charge changes to negative imply the presence of L-Cyst monolayer at particle interface. Band gap energy of 2.12 eV [bare Fe 3 O 4 NPs] and 1.4 eV [L-Cyst-Fe 3 O 4 NPs] were obtained. Lead and chromium removal were investigated at different initial pHs, contact time, temperatures and adsorbate-adsorbent concentrations. Maximum Cr 6+ and Pb 2+ removal occurred at pH 2.0 and 6.0, respectively. Sorption dynamics data were best described by pseudo-second order rate equation. Pb 2+ and Cr 6+ sorption equilibrium data were best fitted to Langmuir equation. Langmuir adsorption capacities of 18.8 mg/g (Pb 2+ ) and 34.5 mg/g (Cr 6+ ) at 45 °C were obtained. Regeneration of exhausted L-Cyst-Fe 3 O 4 NPs and recovery of Pb 2+ /Cr 6+ were demonstrated using 0.01 M HNO 3 and NaOH. L-Cyst-Fe 3 O 4 NPs stability and reusability were also demonstrated." @default.
• W2742291446 created "2017-08-17" @default.
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• W2742291446 date "2017-08-09" @default.
• W2742291446 modified "2023-10-14" @default.
• W2742291446 title "Lead and Chromium Adsorption from Water using L-Cysteine Functionalized Magnetite (Fe3O4) Nanoparticles" @default.
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• W2742291446 doi "https://doi.org/10.1038/s41598-017-03380-x" @default.
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