Enhanced photocatalytic degradation of methylene blue dye under UV-light irradiation using Bi2S3/ZnS and ZnS/ Bi2S3 nanocomposites | ||||
| Egyptian Journal of Chemistry | ||||
| Volume 66, Issue 9, September 2023, Page 293-306 PDF (1.33 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2022.173941.7212 | ||||
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| Authors | ||||
Ashraf A. El-Bindary   1; Mokhtar S. Beheary2; Noha S. Samra2; Mina S. Adly3
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| 1Chemistry Department, Faculty of Science, Damietta University, New Damietta 34517, Egypt. | ||||
| 2Environmental Science Department, Faculty of Science, Port Said University, Port Said 42526, Egypt. | ||||
| 3Chemistry Department, Faculty of Science, Mansoura University, Mansoura 35511, Egypt. | ||||
| Abstract | ||||
| Bi2S3, ZnS, and different ratios of Bi2S3 to ZnS, and ZnS to Bi2S3 have been prepared by hydrothermal method to investigate their efficiency in the adsorption of a toxic cationic methylene blue (MB) dye from synthetic aqueous solutions, and to prove that the heterojunction addition of zinc sulfide to bismuth sulfide and bismuth sulfide to Zinc sulfide with different ratios (1.0, 3.0, 7.0 wt%) significantly improved their photocatalytic activity and methylene blue dye removal. Photodegradation time, initial dye concentrations, and adsorbent doses respectively have been studied. The optimum conditions of methylene blue (MB) dye adsorption were at a contact time of 120 min, 0.05 g/L of pure Bi2S3, pure ZnS, 1 wt% Bi2S3/ZnS, and 1 wt% ZnS/ Bi2S3) in an aqueous solution of pH=7, at room temperature, and the %removal of the dye under these conditions reached about (70%, 60%, 95%, and 91%) respectively, and the dye adsorption kinetic process has been analyzed using pseudo-first-order kinetic models. The results presented that the adsorption kinetics of methylene blue (MB) dye followed a pseudo-first-order model very well. FTIR, XRD, XPS, and TEM techniques have been conducted to illustrate the properties and characterizations of the prepared photocatalysts. The noticeable improvement we found in the properties and photodegradation rate of heterostructured photocatalysts compared to single photocatalysts hold considerable promise for the development of the novel as well as for the remediation of the environment. | ||||
| Keywords | ||||
| Heterojunction photocatalysts; Hydrothermal; Bi2S3; ZnS; methylene blue dye | ||||
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