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Wet chemical extraction of silicon from natural palygorskite for preparing a mesoporous molecular sieve of Al-SBA-16

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Three-dimensional mesoporous molecular sieve, Al-SBA-16, was successfully prepared via a wet chemical route, which involved co-condensation of silicon source from natural palygorskite by alkali-melting extraction, and acidic mixture of templating agent F127 and aluminum sulfate. XRF and Raman spectra confirmed quantitative incorporation of aluminum into ordered cubic mesostructure. Pyridine-probed Fourier transformed infrared spectroscopy and 1H magic-angle spinning nuclear magnetic resonance showed a doubling of the Brønsted and Lewis acidity after aluminum activation. At neutral pH, the Al-SBA-16 was used as an adsorbent for the removal of aniline and basic fuchsin with the maximum adsorption capacities of 46.22 and 70.08 mg g−1, respectively. Adsorption kinetics and isotherm indicated that adsorption of aniline and basic fuchsin was occurred by their lone pair electrons on N atom interacting with the Brønsted and Lewis acid sites of Al-SBA-16. The adsorbed material could be easily regenerated by a simple process of acid washing. It was reused for five times with basic fuchsin removal rate still up to above 90%.

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This work was supported primarily by the National Natural Science Foundation of China (21876015), the Natural Science Foundation of Jiangsu Province (BK20161277), the Natural Science Foundation of Jiangsu Education Department (16KJB610002) and the Postdoctoral Science Foundation of China (2017M611784).

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Correspondence to Shaomang Wang.

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Guan, Y., Wang, S., Sun, C. et al. Wet chemical extraction of silicon from natural palygorskite for preparing a mesoporous molecular sieve of Al-SBA-16. Chem. Pap. 73, 2655–2666 (2019).

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