Abstract
Calcium sulfate whisker (CSW) was prepared from flue gas desulfurization (FGD) gypsum by recrystallization method, and then was employed in preparing ZnO/CSW photocatalysts by impregnation method. CSW and ZnO/CSW were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS) and photoluminescence spectrum (PL). The photocatalytic activity of various ZnO/CSW photocatalysts was evaluated by photocatalytic degradation of methylene blue (MB) under simulated sunlight irradiation. The results showed that various ZnO/CSW photocatalysts exhibited much higher photocatalytic activity than pure ZnO and CSW. Among various ZnO/CSW photocatalysts, the photocatlytic activity of ZnO/CSW increased as increasing the ZnO loading amount from 1.2% to 8.7%, but decreased when the ZnO loading amount was beyond 8.7% due to the increasing crystalline size of ZnO and recombination of photogenerated hole/electron pairs. Besides ZnO loading amount, MB initial concentration and the dosage of photocatalyst also had significant influence on MB degradation rate, and MB degradation rate over ZnO/CSW reached 95.4% under optimum conditions. Kinetics study revealed that the photocatalytic degradation of MB over ZnO/CSW can be described by the pseudo-first-order kinetic model, and the apparent rate constant k versus ZnO loading amount L, MB initial concentration C0 and the dosage of photocatalyst D can be described as: k=0.5237L0.5193C −0.30740 D0.4589.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 21673290), the Joint Funds of the National Natural Science Foundation of China (No. U1662103) and Beijing Education Committee Science and Technology Project (KM202010017007).
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Lin, S., Tian, Y., Zhang, W. et al. Enhanced photocatalytic activity over ZnO supported on calcium sulfate whisker derived from desulfurization gypsum. Korean J. Chem. Eng. 39, 3267–3276 (2022). https://doi.org/10.1007/s11814-022-1208-y
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DOI: https://doi.org/10.1007/s11814-022-1208-y