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. 2022 Nov 9:1–14. Online ahead of print. doi: 10.1007/s11356-022-24064-8

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© The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2022, corrected publication 2022Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

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Fig. 8 — FTIR spectrum graph of SNL and SNL Cr(VI) (before and after adsorption process). (I), Complete spectra range from 4000 to 400 cm⁻¹. (II), Spectra range from 1700 to 1200 cm⁻¹. (III), Spectra range from 860 to 400 cm.⁻¹