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- Title
Peculiarities on methyl orange adsorption by porous ZnIn<sub>2</sub>S<sub>4</sub> prepared in different conditions.
- Authors
Cadiş, A. I.; Mureșan, L. E.; Perhaița, I.; Pop, L. C.; Saszet, K.; Barbu-Tudoran, L.; Borodi, G.
- Abstract
Introduction: Synthesis of nanostructured materials with well-controlled morphology and large specific surface area is essential in adsorption and catalysis for environmental depollution applications. Methods and objectives: In the present work, several varieties of high porous zinc indium sulfide (ZnIn2S4) were prepared using microwave-assisted and oil bath precipitation. The role of synthesis temperature and zinc concentration on the morpho-structure, porosity, and optical properties of ZnIn2S4 was investigated. Results: Hexagonal ZnIn2S4 phase was formed at 180°C while disordered cubic ZnS-In2S3 phase was identified at 160°C. Based on ICP-OES measurements, it was found that all samples contain lower amounts of zinc than theoretically expected leading to non-stoichiometric compounds. The specific surface area increases from 88.4 to 425.6 m2/g with temperature and zinc amount, values that are higher than those reported in literature. The morphology of ZnIn2S4 is changing from agglomerated rounded nanoparticles to micro-flower, nano-petals, or hollow microspheres depending on the synthesis conditions. A growth mechanism was also proposed for all the nanostructures with different morphologies. The band gap of ZnIn2S4 decreases from 3.61 to 2.81 eV due to morpho-structural and porosity changes. The blue-green luminescence was attributed to different defect sites in ZnIn2S4 structures. Adsorption investigations of the methyl orange were carried out and discussed. Conclusion: Oil - bath samples present a higher adsorption ability than micro-wave samples due to structural and morphology differences.
- Subjects
ADSORPTION (Chemistry); MICROSPHERES; NANOSTRUCTURED materials; NONSTOICHIOMETRIC compounds; BAND gaps; SURFACE area; ZINC sulfide
- Publication
Journal of Nanoparticle Research, 2022, Vol 24, Issue 3, p1
- ISSN
1388-0764
- Publication type
Article
- DOI
10.1007/s11051-022-05458-8