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Adsorbents, including cotton stalk (CS), sulphuric acid treated cotton stalk (SCS) and phosphoric acid treated cotton stalk (PCS), were used for removing methylene blue (MB) from aqueous solutions. Compared with the CS prepared activated carbons, less specific surface area and more functional groups on these adsorbents were found. The adsorption capacity was in the order of SCS>PCS>CS. It was...
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