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Construction of a Carbon/Lignosulfonate Adsorbent to Remove Pb²⁺ and Cu².

ABSTRACT: Removing heavy metal ions from water is an important issue to improve water quality. However, using cost-effective and more environmentally friendly adsorbents to achieve efficient adsorption capacity remains a challenge. Carbon spheres were prepared by the hydrothermal method and then combined with sodium lignosulfonate to form a lignosulfonate carbon (C/SL) adsorbent. C/SL achieved the adsorption of Pb²⁺ and Cu²⁺ after 60 min (the adsorption capacity was 281 mg g^-1 for Pb²⁺ and 276mg g^-1 for Cu²⁺) and had good selectivity and reusability (5 cycles). The simulated experimental data show that the pseudo-second-order kinetics and Langmuir isotherm are closer to the actual adsorption. Thermodynamic studies show that the adsorption of Pb²⁺ and Cu²⁺ is enhanced by the spontaneous process at higher temperature. This study also shows that functional groups such as hydroxyl and amino groups play an important role in the adsorption process.

SUBMITTER: Bai L

PROVIDER: S-EPMC8756795 | biostudies-literature |

REPOSITORIES: biostudies-literature

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