Abstract
The aim of this work is to develop a ligand-modified mesoporous silica adsorbent
for the removal and colorimetric determination of Zn(II) ions from water samples.
In this study, mesoporous (monolithic) silica material was synthesized in acidic
condition by using tetraethylorthosilicate (TEOS) and non-ionic surfactant Brij 56.
The organic ligand 5-Br-PADAP was successfully immobilized onto the
mesoporous silica. This adsorbent was characterized by FT-IR, SEM, EDX and
BET analysis. The experimental works were carried out by batch method. In
adsorption studies several parameters such as pH of solution, initial Zn(II) ion
concentration, interfering ions, color optimization and reusability of the adsorbent
were optimized. The experimental data showed that the maximum Zn(II)
adsorption was possible at pH 8. The maximum adsorption capacity was
determined and found to be 18.02 mg/g. Desorption of Zn (II) ions was possible
when 0.10 mol/L HCl was used. This adsorbent (5-Br-PADAP-doped silica
particles) showed a marked color change from orange to fuschia red in the
presence of Zn(II) ion depending on pH value of solution. Color changes of the
adsorbent were confirmed by Diffuse Reflectance Spectrometric (DRS)
measurements. The colorimetric data was shown the differences in the color hues
of the adsorbent phase with increases of Zn(II) concentration. The linear dynamic range for the colorimetric determination of Zn(II) was 5–100 μg/L. The adsorbent
showed a high chromogenic selectivity for Zn(II) over other ions with a detection
limit of 0.4 μg/L in solution. The relative standard deviation (RSD) for 6 replicate
measurements of 10 μg/L zinc was 2.7%. The developed colorimetric method was
applied to the extraction and determination of zinc in different certified reference
materials and real water samples.
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