Journal of Guangxi Normal University(Natural Science Edition) ›› 2023, Vol. 41 ›› Issue (5): 105-115.doi: 10.16088/j.issn.1001-6600.2022110901

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Adsorption Performance of Red Mud-Sodium Alginate Hydrogel on Pb(Ⅱ) in Water

WANG Wei1,2, DENG Hua1,2*, HU Lening1,2, LI Yang3   

  1. 1. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection(Guangxi Normal University) Guilin Guangxi 541006, China;
    2. College of Environment and Resources, Guangxi Normal University, Guilin Guangxi 541006, China;
    3. Guangxi Zhuang Autonomous Region Academy of Environmental Protection Science, Nanning Guangxi 530022, China
  • Received:2022-11-09 Revised:2023-03-04 Published:2023-10-09

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Abstract: Red mud-sodium alginate hydrogel (RMSA) was prepared by cross-linking reaction using red mud and sodium alginate as raw materials. The effects of initial pH of solution, adsorption temperature, adsorption time, initial concentration and multiple heavy metal systems on the adsorption effect of RMSA on Pb(Ⅱ) were investigated by batch experiments and combined with XRD, FTIR and SEM-EDS characterization analysis, its adsorption characteristics on Pb(Ⅱ) was studied. The experimental results showed that the proposed secondary kinetic adsorption model and Langmuir adsorption isotherm model could better describe the adsorption process of RMSA on Pb(Ⅱ), which belonged to single molecular layer chemisorption. The maximum theoretical adsorption capacity of RMSA on Pb(Ⅱ) was 454.54 mg/g under the optimal conditions of pH=6, temperature of 25 ℃, adsorption time of 900 min and initial concentration of Pb(Ⅱ) of 30-900 mg/L. The adsorption of RMSA on Pb(Ⅱ) was more selective in the adsorption experiments of multivariate heavy metal systems. The analysis showed that ion exchange was the main mechanism of Pb(Ⅱ) adsorption by RMSA. In addition, RMSA still maintained high adsorption performance in the five-cycle experiment, which had a good application prospect in terms of economic applicability.

Key words: red mud, hydrogel, Pb(Ⅱ), sodium alginate, adsorption

CLC Number:  X53
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