Journal of Guangxi Normal University(Natural Science Edition) ›› 2024, Vol. 42 ›› Issue (5): 150-162.doi: 10.16088/j.issn.1001-6600.2024030702

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Adsorption Effect of Red Mud-Polyacrylic Acid-Carboxymethyl Cellulose Hydrogel on Pb2+ in Water

FU Jiahui1,2,3, WANG Wei1,2,3, DENG Hua1,2,3*, ZHAO Dong1,2,3, ZHANG Shuyun1,2,3, YE Shunyun1,2,3, HU Lening1,2,3   

  1. 1. Guangxi Key Laboratory of Environmental Processes and Remediation in Ecologically Fragile Regions (Guangxi Normal University), Guilin Guangxi 541006, China;
    2. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin Guangxi 541006 China;
    3. College of Environment and Resources, Guangxi Normal University, Guilin Guangxi 541006, China
  • Received:2024-03-07 Revised:2024-04-14 Online:2024-09-25 Published:2024-10-11

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Abstract: In order to solve the pollution of lead (Pb) in the environment and to properly dispose of red mud,an industrial solid waste generated in alumina oxide smelting. In this study,red mud was used as raw material,sodium carboxymethyl cellulose (CMC) and acrylic acid (AA) were introduced through polymerization and cross-linking reaction to prepare red mud-polyacrylic acid-carboxymethyl cellulose (RMAAC) composite hydrogel. It had adsorption performance,strong stability and high recycling rate,which were used as adsorbents for adsorption of Pb2+ in water. The adsorption of Pb2+ by RMAAC was mainly attributed to monomolecular layer chemisorption with the involvement of physisorption. The adsorption mechanisms may include ion exchange,functional group complexation,cation-π and ligand chelation. The maximum adsorption amount calculated by Langmuir model was 730.16 mg/g,and excellent adsorption properties within a broad pH range of 3 to 6. RMAAC showed high selective adsorption capacity for Pb2+ in the pollution of multiple heavy metal ions.

Key words: hydrogel, red mud, complex material, lead, adsorption mechanism, selective adsorption

CLC Number:  X53
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