Functionalized Magnetic Nanoparticles for Heavy Metal Removal from Aqueous Solutions: Kinetics and Equilibrium Modeling

Gautam, Ravindra Kumar; Jaiswal, Amita; Chattopadhyaya, M. C.

doi:10.1002/9781118773857.ch11

Cited by 4 publications

(1 citation statement)

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“…Fan et al [9] used nanoscale zerovalent iron particles to decolorize methyl orange in aqueous solution with a decolourization efficiency of 100% within 60 min; pH adjustment was unnecessary because of the high surface area, small particle size, and the large density of intrinsic surface sites of the iron particles [13]. The use of nanoscale iron particles has been well established for the separation and purification of toxic metal ions and organic compounds [14]. However, reports indicate that the pollutant adsorption rate by iron oxide nanoparticles was very slow [8,12].…”

Section: Introductionmentioning

confidence: 98%

Synthesis of bimetallic Fe–Zn nanoparticles and its application towards adsorptive removal of carcinogenic dye malachite green and Congo red in water

Gautam

Rawat

Banerjee

et al. 2015

Journal of Molecular Liquids

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160

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Section: Introductionmentioning

confidence: 98%

Synthesis of bimetallic Fe–Zn nanoparticles and its application towards adsorptive removal of carcinogenic dye malachite green and Congo red in water

Gautam

Rawat

Banerjee

et al. 2015

Journal of Molecular Liquids

Self Cite

160

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Ni2+ removal by ion exchange resins and activated carbon: a benchtop NMR study

Bernardi,

Hantson,

Caulier

et al. 2024

Int. J. Environ. Sci. Technol.

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Heavy metal pollution in water is a critical environmental concern, demanding effective remediation techniques. Traditional methods, including ion exchange and adsorption, often rely on inductively coupled plasma (ICP) atomic emission spectroscopy/mass spectrometry (AES/MS) for the indirect and time-consuming measurement of residual metal concentrations. In contrast, this study employs innovative direct monitoring of nickel removal by benchtop NMR relaxometry using the paramagnetic properties of Ni2+. To prove the feasibility of the NMR follow-up of Ni2+ uptake, batch experiments were performed with Amberlite IR120, Amberlite IRC748, Dowex Marathon MSC, and activated carbon (AC), which were previously characterized by various techniques. The effect of contact time, pH, and Ni2+ concentration on removal efficiency were studied. Pseudo-first and pseudo-second order kinetic models were used. The Langmuir model effectively described the equilibrium isotherms. The longitudinal and transverse relaxation curves of the loaded resins were biexponential. For sulfonic resins, a strong correlation was observed between the relaxation rates of the fast-relaxing fraction and the Ni2+ content determined by ICP-AES/MS. For IRC748, the effect of Ni2+ loading on the relaxation rates was weaker because of Ni2+ complexation. The relaxation curves of loaded AC revealed multiple fractions. Centrifugation was employed to eliminate the contribution of intergranular water. The remaining intragranular water contribution was biexponential. For high Ni2+ loadings, the relaxation rates of the slow relaxing fraction increased with the AC Ni2+ content. These results mark the initial stage in developing a column experiment to monitor, in real-time, adsorbent loading by NMR relaxometry.

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