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. 2021 Aug 23;29(1):251–263. doi: 10.1007/s11356-021-15187-5

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Fig. 9 — Metal adsorption tests performed in 500 ppm metal solutions. The NSs adsorption capacity is expressed as a percentage of the removed amount of metal (b) and ppm before/after absorption (a). UV spectra of βNS-Citr 1:4 (batch and TSE) (c) and βNS-Citr 1:8 (batch and TSE) (d) are reported