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. 2021 Nov 26;14(23):7231. doi: 10.3390/ma14237231

Figure 14.

Figure 14

Influence of regeneration cycle on the adsorption of sulfonated lignite by filter paper-templated Mg-Al metal oxides (initial sulfonated lignite concentration: 200 mg/L; adsorbent dosage: 0.015; initial pH: 7; temperature set to 25 °C; stirring time: 12 h).