Abstract
Higher efficient degradation of methyl orange (MO) was demonstrated with nanometer-sized high-silica SAPO-5. By a hydrothermal process, synthesized high-silica SAPO-5 and low-silica SAPO-5 showed Si-to-Al ratios of 4.20 and 0.11, respectively. High-silica SAPO-5 showed much better MO degradation efficiency with a dosage of 70 mg in MO solution with a concentration of 10 mg/L under ultraviolet illumination. High-silica SAPO-5 also exhibited good producibility for preparation and stable photocatalytic activity even after the fifth recycling test. Optical characterizations of DRS, XPS, photocurrent density and time-resolved fluorescence were carried out for SAPO-5 samples. Finally, free radical and hole scavenging experiments were investigated for high-silica SAPO-5, and a MO photodegradation mechanism based on the charge transfer excited state of [Al2+–O−]* was proposed. This work highlights great prospects of high-silica SAPO-5 for organic pollutant removal with virtues of ideal efficiency and environmental friendliness.
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Acknowledgements
Financial supports from the National Natural Science Foundation of China (No. 51363007), Natural Science Foundation of Jiangxi Province (No. 20171BAB206008), the Doctoral Scientific Research Starting Foundation of Jiangxi Science and Technology Normal University (No. 2017BSQD003) and Project of Sci-Tech Innovative Team for Nano Functional Materials of Jiangxi Science and Technology Normal University (No. YC 2017-X17) are gratefully acknowledged.
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Qiu, L., Zhou, Z., Yu, Y. et al. Fabrication of nanometer-sized high-silica SAPO-5 and its enhanced photocatalytic performance for methyl orange degradation. Res Chem Intermed 45, 1457–1473 (2019). https://doi.org/10.1007/s11164-018-3675-7
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DOI: https://doi.org/10.1007/s11164-018-3675-7