Sheet-like orthorhombic MoO3 nanostructures prepared via hydrothermal approach for visible-light-driven photocatalytic application
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In the present work, sheet-like α-MoO3 nanostructures (NS) were prepared by a simple hydrothermal method using ammonium heptamolybdate tetrahydrate as a molybdenum source and nitric acid. The synthesized α-MoO3 NS have been characterized structurally and morphologically using various analytical techniques. The PXRD, FT-IR, Raman and XPS spectroscopic analysis results revealed the formation of phase pure α-MoO3. The SEM–EDX analysis further confirms the purity of the synthesized α-MoO3 NS. FE-SEM and HR-TEM results indicated that the synthesized α-MoO3 has sheet-like morphology. Further, the obtained α-MoO3 NS could be used as the effective photocatalyst for the degradation of methylene blue and rhodamine B dyes. It was found that > 95% dye degradation efficiency was achieved for both the organic dyes within 90 min irradiation times. This enhanced photocatalytic activity of α-MoO3 can be attributed to the presence of a greater number of active sites in the sheet-like morphology that are more vulnerable for adsorption of organic dyes and subsequent elimination by decomposition under visible-light condition.
Keywordsα-MoO3 nanostructures Hydrothermal method Photocatalyst Degradation Organic dyes
The authors are very thankful for the provided financial support through the Technical Education Quality Improvement program (TEQIP II), Anna University, BIT Campus, Tiruchirappalli, India. Also, CSIR-CECRI, Karaikudi, is acknowledged for providing lab facility and a Central Instrumentation Facility.
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Conflicts of interest
The authors declare that there is no conflict of interest.