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Ion-imprinted modified molecular sieves show the efficient selective adsorption of chromium(vi) from aqueous solutions.

ABSTRACT: Molecular sieve 5A was modified with (3-aminopropyl) triethoxysilane (APTES) as the support matrix, on which 4-VP was used as the ionic imprinting group. The as-prepared IIZMS-APTES was applied as the adsorbent for the recovery of chromium(vi) from aqueous solutions. The adsorbent was characterized via Fourier transform infrared spectroscopy (FT-IR), scanning electronic microscopy (SEM), and X-ray diffraction (XRD). The influences of adsorption time, concentration of the ions, initial pH, and temperature on the adsorption performance to Cr(vi) were investigated. The selectivity and reusability of IIZMS-APTES are also evaluated. The results showed that the maximum adsorption capacity reached 56.46 mg g^-1 when the initial concentration of metal ions was at 100 mg L^-1 at pH 2 and 30 °C. The adsorption process followed the pseudo-second-order kinetic model and Langmuir adsorption isotherm model. The IIZMS-APTES exhibits an efficient selective adsorption of Cr(vi) from aqueous solutions.

SUBMITTER: Li J

PROVIDER: S-EPMC9058396 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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Ion-imprinted modified molecular sieves show the efficient selective adsorption of chromium(vi) from aqueous solutions.

Li Junwen J Cheng Haiming H

RSC advances 20201101 71

Molecular sieve 5A was modified with (3-aminopropyl) triethoxysilane (APTES) as the support matrix, on which 4-VP was used as the ionic imprinting group. The as-prepared IIZMS-APTES was applied as the adsorbent for the recovery of chromium(vi) from aqueous solutions. The adsorbent was characterized <i>via</i> Fourier transform infrared spectroscopy (FT-IR), scanning electronic microscopy (SEM), and X-ray diffraction (XRD). The influences of adsorption time, concentration of the ions, initial pH, ...[more]

PMID: 35519671

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Project description:Cadmium is one of the most hazardous heavy metal contaminants, and it is usually abundant in the wastewater released from paint and pigment industries. Such effluents urgently need to be treated before their proper reuse for various industrial and agricultural purposes. Therefore, in this study, the process of Cd(ii) ion adsorption from waste aqueous-solutions was investigated using polystyrene (PS), ethanolamine-modified polystyrene (EA-PS), and chromium hydroxide-impregnated ethanolamine-modified polystyrene (Cr@EA-PS) as new effective sorbents. The structural and textual properties as well as the surface charges and particle sizes of the prepared sorbents were examined using Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), N2 adsorption-desorption surface area analysis, X-ray diffraction (XRD), dynamic light scattering (DLS) and zeta potential analysis. Herein, correlations between different features of the three adsorbents and their impacts on adsorption efficiency were extensively investigated. Adsorption kinetics and isotherm studies were also conducted to evaluate the sorption mechanisms and the achieved capacities of the presented adsorbents. Results showed that surface functionalization with ethanol amine particles significantly improved adsorption capacity owing to the introduction of amino groups, providing further interactions with heavy metal species. Moreover, the subsequent impregnation of Cr(OH)3 into the EA-PS structure could successively enhance surface properties and porosity, leading to observation of the highest adsorption capacity (13.6 mg g-1 for Cr@EA-PS). Such increased adsorption capacity is nearly 10-fold higher than the reported capacity of PS. Kinetic studies revealed that the adsorption process followed a pseudo-second-order model, indicating chemisorption as the primary adsorption mechanism. Isotherm analysis confirmed a favorable monolayer adsorption process exhibited by the three structures. The combination of chemical bonding and physical adsorption mechanisms was observed for Cr@EA-PS, explaining its performance superiority in removing Cd(ii) ions. Thus, the inorganic-organic composite exhibits the highest potential among the three introduced sorbents for practical applications in the field of wastewater treatment.

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Ion-imprinted modified molecular sieves show the efficient selective adsorption of chromium(vi) from aqueous solutions.

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Ion-imprinted modified molecular sieves show the efficient selective adsorption of chromium(vi) from aqueous solutions.

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