Nanocatalisador sustentável à base de sílica e nanopartículas de trióxido de molibdênio para aplicação na remoção do corante rodamina 6G
Palavras-chave:
SiO2, MoO3, fotocatálise, biossíntese.Resumo
A contaminação de corpos hídricos por corantes sintéticos, como a rodamina 6G (Rh6G), representa um grave problema ambiental, devido à toxicidade e resistência à degradação desses poluentes. Paralelamente, resíduos agroindustriais apresentam elevado potencial poluidor, quando descartados de forma inadequada, como as cascas de arroz. Neste contexto, a fotocatálise heterogênea surge como uma tecnologia promissora para a degradação de contaminantes orgânicos, especialmente com o uso de nanocatalisadores obtidos por rotas verdes. Neste contexto, o presente trabalho tem como objetivo desenvolver e caracterizar um nanocatalisador sustentável à base de sílica e nanopartículas de trióxido de molibdênio (SiO2/MoO3-NPs) a partir da casca de arroz e extrato de folhas de Araucaria angustifólia, para aplicação na remoção do corante Rh6G. SiO2/MoO3-NPs apresentou elevada área superficial (263 m2.g-1), energia de band gap de 2,7 eV e mesoporosidade favorável. A condição ideal foi [SiO2/MoO3-NPs] = 4,17 g.L-1, pH 7, [Rh6G] = 1,63 mg.L-1, com uma remoção de 99,9% de remoção da Rh6G (k = 0,027 min-1; R2 = 0,989), evidenciando seu potencial como catalisador para a remediação ambiental.
Referências
1. Khan, W. U.; Ahmed, S.; Dhoble, Y.; Madhav, S. A critical review of hazardous waste generation from textile industries and associated ecological impacts. J. Indian Chem. Soc. 2023, 100(1), 100829–100836.
2. Singh, R.; Das, R.; Sangwan, S.; Rohatgi, B.; Khanam, R.; Peera, S. K. P. G.; et al. Utilisation of agro-industrial waste for sustainable green production: a review. Environ. Sustain. 2021, 4(4), 619–636.
3. Thangamuniyandi, P.; Umapathy, D.; Nagarajan, L.; Velanganni Arockiam, A. J. Blue-LED assisted Photodegradation kinetics of rhodamine-6G dye, enhanced anticancer activity and cleavage of plasmids using Au-ZnO nanocomposite. Heliyon 2025, 11(1), 1–16.
4. Rani, M.; Yadav, J.; Shanker, U.; Wang, C. Recent updates on remediation approaches of environmentally occurring pollutants using visible light-active nano-photocatalysts. Environ. Sci. Pollut. Res.2024, 31(15), 22258–22283.
5. Dikshit, P.; Kumar, J.; Das, A.; Sadhu, S.; Sharma, S.; Singh, S.; et al. Green Synthesis of Metallic Nanoparticles: Applications and Limitations. Catalysts 2021, 11(8), 902–936.
6. Bhattacharjee, J.; Roy, S. Exploration of Molybdenum Oxide Compounds-A Review. Catalysis Research 2024, 04(03), 1–19.
7. Bukhari, M. A.; Bukhari, S. M. Z. S.; Khalid, M. Y.; Arif, Z. U. Advancing photocatalytic activity through a green route: Bismuth ferrite@molybdenum trioxide heterostructure for sustainable water treatment. J. Mol. Struct. 2024, 1315, 138811–138820.
8. Oviedo, L. R.; Muraro, P. C. L.; Pavoski, G.; Espinosa, D. C. R.; Ruiz, Y. P. M.; Galembeck, A.; et al. Synthesis and characterization of nanozeolite from (agro)industrial waste for application in heterogeneous photocatalysis. Mater. Today Proc. 2022, 29(3), 3794–3807.
9. Oviedo, L. R.; Druzian, D. M.; Nora, L. D. D.; Da Silva, W. L. Biosynthesis and characterization of a novel supported nanocatalyst for the methylene blue dye photodegradation: Machine learning modeling and photocatalytic activity. Catal. Today 2024, 441, 114888–114894.
10. Li, Y.; Lu, Y.; Li, X.; Zhong, W.; Zhu, B.; Liu, K. Enhanced activation of peroxymonosulfate for tetracycline degradation via Cu-doped natural pyrite-based CuFeS2@FeS2 composite catalysts: Elucidating the catalytic mechanism and synergistic effect of dual catalytic sites. J. Chem. Eng. 2025, 509, 161454–161468.
11. Anabalón Fuentes, P.; Kopp Pailañir, M.; Rocha Mella, S.; González Quijón, M. E.; Marzialetti Bernardi, T.; Cea Lemus, M. Development of bifunctional biochar/iron oxide composites for tetracycline removal from synthetic wastewater. J. Water Process Eng. 2024, 64, 105509–105525.
12. Brum, L. F. W.; Da Silva, M. D. C. R.; Dos Santos, C.; Pavoski, G.; Espinosa, D. C. R.; Da Silva, W. L. Green synthesis of niobium (V) oxide nanoparticles using pecan nutshell (Carya illinoinensis) and evaluation of its antioxidant activity. Catal. Today 2025, 445, 115106–115109.
13. Rubina, S.; Vineetha, P. K.; Anas, S. An efficient polymer supported Fenton type catalyst for photodegradation of organic dyes. J. Photochem. Photobiol. A: Chem. 2024, 449, 115410–115418.
14. Thompson, W. A.; Sanchez Fernandez, E.; Maroto-Valer, M. M. Probability Langmuir-Hinshelwood based CO2 photoreduction kinetic models. J. Chem. Eng. 2020, 384, 123356–123367.
15. Shabna, S.; Singh, C. J. C.; Dhas, S. D. S. J.; Jeyakumar, S. C.; Biju, C. S. An overview of prominent factors influencing the photocatalytic degradation of cationic crystal violet dye employing diverse nanostructured materials. J. Chem. Technol. Biotechnol. 2024, 99(5), 1027–1055.
16. Lukiyanchuk, I. V.; Vasilyeva, M. S.; Adigamova, M. V.; Morozova, V. P.; Budnikova, Yu. B.; Korochentsev, V. V. Ferromagnetic PEO coatings on titanium as photo-Fenton-like heterogeneous catalysts. J. Phys. Chem. Solids. 2024, 193, 112154–112166.
17. Liang, Z.; Yang, Y.; Zhang, Y.; Li, S.; Zhang, W.; Zhang, L.; et al. Synergistic photocatalysis of mesoporous confinement effect and Si-O-Ti interface for organic pollutants degradation. J. Surf. 2024, 51, 104715.
18. Zhang, H.; Liu, J.; Xu, T.; Ji, W.; Zong, X. Recent Advances on Small Band Gap Semiconductor Materials (≤2.1 eV) for Solar Water Splitting. Catalysts 2023, 13(4), 728–757.
19. Rangelova, N.; Aleksandrov, L.; Yaneva, S. Synthesis and structure of amorphous SiO2/ZnO composites with potential application for azo dye degradation. Mater. Today: Proc. 2022, 61, 1272–1279.
20. Castellanos-Espinoza, R.; González-Uribe, G.; Arjona, N.; Rodríguez-González, C.; Ramos-Castillo, C. M.; Álvarez-Contreras, L.; et al. The impact of the design of MoO3 nanorods on the bactericidal performance. Appl. Surf. Sci. 2025, 684, 161889–161899.
21. Aziri, S.; Bozetine, H.; Meziane, S.; Allam, D.; Berkane, N.; Bakri, R.; et al. Screening and optimization of the most influencing factors during the photodegradation of Rhodamine B by zinc oxide photocatalyst: application of Plackett–Burman and central composite designs. Reac. Kinet. Mech. Cat. 2024, 137(4), 2395–2414.
22. Al-Zaqri, N. Highly operative near full spectrum Cu doped NiO/ZnO photocatalyst: Photodegradation of phenol and organic dyes. Opt. Mater. 2023, 143, 114139–114148.
