Construction of upconversion fluoride/attapulgite nanocomposite for visible-light-driven photocatalytic nitrogen fixation

Abstract

Developing photocatalysts with wide spectrum absorption and strong nitrogen activation is critical for nitrogen fixation under mild conditions. Herein, one-dimensional natural clay attapulgite (ATP) supported YF₃:Sm³⁺ were successfully synthesized via microwave hydrothermal method, and the composites were employed as the catalyst for photocatalytic nitrogen fixation under visible-light irradiation. Results indicated that the production of ammonia reached as high as 41.2 mg·L⁻¹ within 3 h when the molar ratio of Sm³⁺ and the mass fraction of YF₃:Sm³⁺ were optimized. The enhanced fixation performance is mainly due to that the modified ATP fibber with abundant active sites and the doped fluoride with defective vacancy facilitate the adsorption and activation of N₂. Furthermore, the upconversion property of YF₃:Sm³⁺ increases the harvesting of visible-light energy, meanwhile the Z-scheme heterostructure built between YF₃:Sm³⁺ and modified ATP inhibits the recombination of charge carriers and retains high redox potentials for N₂ reduction.

Keywords

photocatalysis / nitrogen fixation / attapulgite / upconversion / Z-scheme

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51674043 and 51702026) and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (SJCX18_0951).

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2020 Higher Education Press