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Comparison of the degree of adsorption of sulfonated lignite by filter paper-templated Mg-Al metal oxides and by untemplated Mg-Al metal oxides (initial sulfonated lignite concentration: 200 mg/L and 250 mg/L; adsorbent dosage: 0.015 g; initial pH: 7; temperature set to 25 °C; stirring time: 12 h).
