Uptake of Zn2+ and As3+ from Wastewater by Adsorption onto Imine Functionalized Magnetic Nanoparticles

Abstract

Abstract:In this paper, imine functionalized magnetic nanoparticles (MNP-Maph) were employed to aqueous solutions for the uptake of Zn(II) and As(III). Characterization of the material showed the successful synthesis of this material. Factors affecting the uptake of metal ions in aqueous solution such as change in pH, time, adsorbent dose, adsorbate concentration, and temperature were investigated and optimized to determine the best experimental conditions for the effective adsorption of Zn(II) and As(III) from wastewater samples. The adsorption capacity of MNP-Maph followed similar patterns as that of amine functionalized magnetic nanoparticles (MNP-NH 2 ) for the uptake of both metal ions from aqueous solution when solution pH was varied. Higher pH values favored the uptake of Zn(II) and As(III) by using both adsorbents. Also, increasing the contact time and temperature yielded a higher uptake of Zn(II) and As(III). Both processes can best be described with a pseudo-second order kinetic model, while the Langmuir maximum adsorption capacity (q m ) for Zn(II) increased from 35.83 to 54.53 mg g −1 , and for As(III) from 50.08 to 57.60 mg g −1 .Of note is that the q m of As(III) was higher than that of Zn(II) because of the lower concentration of As(III) in solution compared to that of Zn(II), and thermodynamic parameters indicated that the adsorption processes were heat absorbing and rapid in nature. Experiments to evaluate if the adsorbent could be recycled showed excellent recyclability capacity of MNP-Maph after seven runs. Lastly, application of MNP-Maph for the uptake of Zn(II) and As(III) from municipal wastewater samples showed remarkable sorption performance confirming the potential of imine functionalized magnetic nanoparticles as an excellent adsorbent for the uptake of metal ions from aqueous solutions.

The Status of Arsenic Pollution in the Greek and Cyprus Environment: An Overview

“…Ojemaye et al [95] employed imine functionalized magnetic nanoparticles to aqueous solutions for the removal of As(III) and concluded that these magnetic nanoparticles are a good contender as a potential adsorbent for the removal of As(III) from aqueous solutions without separation difficulty.…”

Multiple nitrogen functionalized magnetic nanoparticles as an efficient adsorbent: synthesis, kinetics, isotherm and thermodynamic studies for the removal of rhodamine B from aqueous solution

“…Table 3, shows that Langmuir model best describes the process for the adsorption of Rh-B from aqueous solution by MNP-Tppy. This conclusion was made on the ground that the origin software 31 employed for the linear square analysis of these data takes into consideration the highest coefficient of squares ( R 2 ). From this result (Table 3), it can be observed that Langmuir model has the highest R 2 value across all temperatures.…”

“…Amine functionalized silica magnetic nanoparticles was prepared by treating silica magnetic nanoparticles with 3-aminopropyltriethoxysilane (APTES) according to a method reported in our previous study 31 . A small amount of APTES was added to silica magnetic nanoparticles (150 mg) previously dispersed in 30 mL absolute ethanol.…”

“…For kinetic and isotherm studies, the model with highest R 2 was considered best for describing the adsorption process. Similarly, spectral were obtained by plotting the data generated from the various instruments with the origin software 31 .…”

Chromium and cadmium adsorption on radiation-grafted polypropylene copolymers: regeneration, kinetics, and continuous fixed bed column studies

“…After adsorption, Cr content was reduced to 0.12 ppm, which corresponds to a 25% decrease, after passing of 1900 BV (i.e., 9 liters) of actual wastewater sample (data not shown). The decrease in adsorption performance maybe due to the complexity of the matrix, competing for the active sites of amino adsorbent [27][28][29]. Further experiments should, therefore, be performed to validate this conclusion.…”