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Ó¢ÎÄ£ºThe adsorbents are rich in cellulose, hemicellulose and lignin, which can provide hydroxyl, carboxyl and other functional groups. On the other hand, more active functional groups were introduced after the modification with different types of carboxylic acids, which were beneficial to the adsorption of heavy metal ions.

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Polysaccharides such as  cellulose, hemicellulose and lignin (components of the adsorbents¿ÉÒÔÊ¡ÂÔ) contain hydroxyl, carboxyl and other functional groups(ôÇ»ùΪÖ÷°É£¿. Additional carboxylic functional groups were introduced after the modification with different acids, which contributed to the adsorption of heavy metal ions.
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