Synthesis of novel nanobioadsorbent for the effective removal of Pb2+ and Zn2+ ions—Adsorption, equilibrium, modeling, and optimization studies

Maheswari, B. Uma; Sivakumar, V.; Thirumarimurugan, M.

doi:10.1016/b978-0-323-90912-9.00022-8

Cited by 2 publications

(2 citation statements)

References 31 publications

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“…Furthermore, the intra-particle diffusion (IPD) model (Weber-Morris) was used to determine the rate-limiting step and the diffusion mechanism as shown in Eq. ( 7): 7 where is the rate constant of intraparticle diffusion (mg/g.min 1/2 ) and provides information that is directly proportional to the boundary layer thickness (mg/g) on the diffusion (Uma Maheswari et al 2022). An increase in the value of C indicates an increase in the boundary layer thickness and a decrease in external mass transfer, which in turn led to an increase in internal mass transfer.…”

Section: Binding Kineticsmentioning

confidence: 99%

Investigation of Mexiletine Hydrochloride Binding on Transition Metal Oxide Nanoparticles by Capillary Electrophoresis

Elmorsi

Lai

2023

Preprint

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The binding affinity of pharmaceutical salts to metal oxide nanoparticles is a fundamental environmental process that determines their transport and bioavailability. Mexiletine hydrochloride (MEX.HCl) interactions with different transition metal oxide nanoparticles (TMONPs) in aqueous dispersion were evaluated by capillary electrophoresis to determine their binding affinities. The results indicated that MEX.HCl bound onto TiO2, Co3O4 and ZnO nanoparticles in alkaline, neutral and acidic pH levels. Interestingly, TiO2 manifested the highest binding affinity of 81 ± 1% at pH 9.4. It was shown that higher initial concentrations of MEX.HCl in an aqueous solution, increasing from 15 to 75 µg/mL, yielded higher binding affinities for TiO2 than Co3O4 and ZnO nanoparticles. The binding rate followed pseudo-second-order kinetics and the binding data were better modeled by the Freundlich isotherm than the Langmuir isotherm. These findings revealed that MEX.HCl binding occurred on the heterogeneous binding sites on TMONPs mainly by the physisorption mechanism via electrostatic attraction and hydrogen bonding.

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Section: Binding Kineticsmentioning

confidence: 99%

Investigation of Mexiletine Hydrochloride Binding on Transition Metal Oxide Nanoparticles by Capillary Electrophoresis

Elmorsi

Lai

2023

Preprint

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“…where 𝑘 𝑖𝑑 is the rate constant of intraparticle diffusion (mg/g.min 1/2 ) and 𝐶 provides information that is directly proportional to the boundary layer thickness (mg/g) on the diffusion 130 . An increase in the value of C indicates an increase in the boundary layer thickness and a decrease in the external mass transfer, which in turn leads to an increase in internal mass transfer.…”

Section: Model/ Tmonpsmentioning

confidence: 99%

Capillary Electrophoresis for Assessing Static Adsorption/Desorption of Pharmaceutically Active Compounds onto/from Transition Metal Oxide Nanoparticles - Central Composite Design of Response Surface Methodology

Morsi¹

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The binding affinity of pharmaceutically active compounds (PACs) onto transition metal oxide nanoparticles (TMONPs) has been investigated through adsorption and desorption processes. This was deemed worthy of scientific investigation to evaluate the potential for TMONPs to act as efficient adsorbents for PACs in environmental water.Response surface methodology has been applied for the separation of PACs by capillary electrophoresis and to investigate chemical desorption parameters. Quadratic and linear regressions were applied to determine peak resolution and migration time. Analytes were separated in the migration order of metformin < phenformin < mexiletine < ranitidine.These PACs hydrochlorides bind onto TMONPs surface through electrostatic interactions and coordination bonding. It appears that the binding isotherm is well predicted by the Freundlich model, and binding kinetics are consistent with the pseudo-second-order model that involves intra-particle diffusion. The % desorption of mexiletine increases from TiO 2 (46.2%) to Co 3 O 4 (63.0%) due to their different surface properties.

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Synthesis of novel nanobioadsorbent for the effective removal of Pb2+ and Zn2+ ions—Adsorption, equilibrium, modeling, and optimization studies

Cited by 2 publications

References 31 publications

Investigation of Mexiletine Hydrochloride Binding on Transition Metal Oxide Nanoparticles by Capillary Electrophoresis

Investigation of Mexiletine Hydrochloride Binding on Transition Metal Oxide Nanoparticles by Capillary Electrophoresis

Capillary Electrophoresis for Assessing Static Adsorption/Desorption of Pharmaceutically Active Compounds onto/from Transition Metal Oxide Nanoparticles - Central Composite Design of Response Surface Methodology

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