Background: Selenium’s popularity in a wide variety of products and industries means
that it has, unfortunately, become a common environmental pollutant, particularly from sources such
as industrial wastewater discharge and agricultural runoff.
Objective: Quantification of the selenium (IV) ion content of natural water sources via atomic fluorescence
spectrophotometry (AFS) was performed using hollow ZnO microflowers as the enriched
materials. The hollow ZnO microflowers were prepared via a hydrothermal method with polystyrene
(PS) microspheres as the template.
Methods: Since the pH of the selenium (IV) solution is known to influence the degree of adsorption
onto the sorbent, both the acidity of adsorption and elution were studied at various pH values to obtain
the adsorption isotherm and adsorption capacity of the sorbent. AFS was used to quantify the
amount of selenium ion that was present in the samples. The structure of the hollow ZnO microflowers
was characterized using XRD, SEM, and TEM characterization methodologies.
Results: When the pH was between 6.0 and 7.0, the percentage of Se (IV) adsorption was as high as
93%. It was found that the amount of Se (IV) that was eluted from the sorbent exceeded 96% with
5.0 mL of a 0.01 mol L−1 NaOH solution over the course of 10 minutes. The maximum adsorption
capacity was 31.5, 31.8, and 32.0 mg·g−1 at 273, 333, and 353 K, respectively.
Conclusion: The LOD for Se (IV) detection via enrichment was achieved at 0.006 μg L−1 with a linear
range between 0.1 and 200 μg L−1. Thus, this method is applicable to the analysis of natural water
samples and GBW(E)080394.