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. 2022 Apr 18;8(4):e09279.
doi: 10.1016/j.heliyon.2022.e09279. eCollection 2022 Apr.

A unique, inexpensive, and abundantly available adsorbent: composite of synthesized silver nanoparticles (AgNPs) and banana leaves powder (BLP)

Mona A Darweesh  1 , Mahmoud Y Elgendy  2 , Mohamed I Ayad  2 , Abdel Monem M Ahmed  3 , N M Kamel Elsayed  4 , W A Hammad  1
Affiliations

A unique, inexpensive, and abundantly available adsorbent: composite of synthesized silver nanoparticles (AgNPs) and banana leaves powder (BLP)

Mona A Darweesh et al. Heliyon. .

Abstract

The purpose of this study is to investigate the development of a new and inexpensive adsorbent by immobilization synthesized silver nanoparticles (AgNPs) onto banana leaves powder (BLP), and the prepared composite (BLP)/(AgNPs) was used as an adsorbent for Zn(II), Pb(II), and Fe(III) ion removal from aqueous solutions under the influence of various reaction conditions. (BLP)/(AgNPs) demonstrated remarkable sensitivity toward Zn (II), Pb (II), and Fe (III) ions; metal ions eliminations increased with increasing contact time, agitation speed, adsorbent dose, and temperature, yielding adequate selectivity and ideal removal efficiency of 79%, 88%, and 91% for Zn (II), Pb (II), and Fe (III) ions, respectively, at pH = 5 for Zn(II) and pH = 6 for Pb(II), and Fe(III). The equilibrium contact time for elimination of Zn (II), Pb (II), and Fe (III) ions was reaches at 40 min. Langmuir, Freundlich, and Temkin equations were used to test the obtained experimental data. Langmuir isotherm model was found to be more accurate in representing the data of Zn(II), Pb(II), and Fe(III) ions adsorption onto (BLP)/(AgNPs), with a regression coefficient (R2 = 0.999) and maximum adsorption capacities of 190, 244, and 228 mg/g for Zn(II), Pb(II), and Fe(III) ions, respectively. The thermodynamic parameters proved that adsorption of metal ions is spontaneous, feasible, and endothermic, whereas Kinetic studies revealed that the process was best described by a pseudo second order kinetics.

Keywords: Adsorption isotherm; Adsorption kinetics; Agriculture waste; Banana leaves; Heavy metals; Ions removal; Silver nanoparticles.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
XRD spectra of BLP and (BLP)/(AgNPs) composite.
Figure 2
Figure 2
FTIR spectra of BLP and BLP/AgNPs composite.
Figure 3
Figure 3
SEM image of BLP/AgNPs composite.
Figure 4
Figure 4
Effect of contact time on the removal percentage of (50 ppm) Zn (II), Pb (II), and Fe (III) ions on BLP/AgNPs.
Figure 5
Figure 5
Effect of adsorbent dose on the removal percentage of Zn (II), Pb (II), and Fe (III) ions.
Figure 6
Figure 6
Effect of metal ions' concentration on the removal percentage of Zn (II), Pb (II), and Fe (III) ions.
Figure 7
Figure 7
Influence of temperature on the removal percentage of Zn (II), Pb (II), and Fe (III) ions.
Figure 8
Figure 8
Plot of ln Kc and 1/T at the temperature range under consideration.
Figure 9
Figure 9
Agitation speed effect on the removal percentage of Zn(II), Pb(II), and Fe(III) ions.
Figure 10
Figure 10
Effect of pH on the removal percentage of Zn(II), Pb(II), and Fe(III) ions.
Figure 11
Figure 11
The Langmuir isotherm for Zn (II), Pb (II), and Fe (III) ions adsorption onto BLP/AgNPs surface.
Figure 12
Figure 12
The Freundlich isotherm for Zn (II), Pb (II), and Fe (III) ions adsorption onto BLP/AgNPs surface.
Figure 13
Figure 13
The Temkin isotherm for Zn (II), Pb (II), and Fe (III) ions adsorption onto BLP/AgNPs surface.
See this image and copyright information in PMC

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