Abstract
Malachite green (MG) is a synthetic cationic dye extensively utilized in the textile industry for colouring purposes. It is a mutagenic agent and potentially carcinogenic for living organisms in nature. Therefore, it is necessary to treat and discharge the industrial effluents covering MG to avoid irreversible and serious effects on both living organisms and the environment. The photocatalyst SnO2 was synthesized by a new method by complexation of sodium diethyldithiocarbamate with tin dichloride pentahydrate, followed by calcination at 450, 600 and 750°C and utilized for photocatalytic degradation of MG dye. The better degradation was obtained at calcination temperature 600°C. The fluorescent light exposure resulted better degradation % of MG dye within 20 min, and the absorbance measurements were noted after every 5 min. The degradation of MG dye improved with an increase in the dose of SnO2 photocatalyst up to 20 mg. The highest decomposition of MG dye was found at 10 pH which may be due to deprotonation. The effects of Na+, HCO3−, Ca2+, Cl−, K+, SO42− and Mg2+ on dye degradation were examined and results showed that the salts had no effect on degradation. The kinetics and isothermic studies were carried out where the kinetic model pseudo-second-order and Langmuir isotherm were highly fitted. The factorial design was also drawn to checked the combined effects of variables, such as pH, dose, concentration and irradiation time on the degradation of MG dye.
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Lanjwani, M.F., Khuhawar, M.Y., Lanjwani, A.H. et al. Photocatalytic degradation capability of SnO2 nanoparticles as a catalyst vs. malachite green dye: factorial design, kinetic and isotherm models. Bull Mater Sci 47, 1 (2024). https://doi.org/10.1007/s12034-023-03070-7
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DOI: https://doi.org/10.1007/s12034-023-03070-7