Abstract
The cheap and efficient heavy metal adsorbents were developed with the forestry and agricultural residues. In this study, three kinds of adsorbents, original ginkgo leaf (GL), NaOH modified ginkgo leaf (NaOH-GL), and KMnO4-modified ginkgo leaf (KMnO4-GL), were prepared and used to adsorb Cd (II) in aqueous solution respectively. The effects of the concentration of Cd (II), absorption time, the dosage of absorbent, and pH of solution on the adsorption process were explored by adsorption experiments. The results showed that the maximum adsorption capacity of Cd (II) by GL, NaOH-GL, and KMnO4-GL was 10.20 mg/g, 39.99 mg/g, and 48.82 mg/g, respectively, under the conditions of room temperature, adsorbent dosage 1g/L, adsorption time 300 min, and pH 6.0. The adsorption of Cd (II) by the three adsorbents accorded with the pseudo-second-order kinetic model and Langmuir isothermal adsorption model, which indicated that the rate-limiting step in the adsorption process was chemical adsorption process and mainly monolayer adsorption. The reason why NaOH-GL and KMnO4-GL could effectively adsorb Cd (II) was that the surface of the modified adsorbent was rough and porous, the number of active groups on the surface increased, and Na and Mn elements could promote the precipitation of Cd (II). The mechanism analysis of KMnO4-GL, which had the best adsorption effect, showed that the adsorption mechanism of Cd (II) might be surface adsorption, ion exchange, and complexing precipitation.
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Funding
This work was financially supported by LiaoNing Revitalization Talents Program (XLYC1907173), the Science and Technology General Project of Liaoning Provincial Education Department (LQ2019003, LQ2020014, LJ2020014), the Open Fund of State Environmental Protection Key Laboratory of Coastal Ecosystem (202103), and the Open Fund of Institute of Ocean Research (BDHYYJY 2021006, BDHYYJY2020014).
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YC: writing, methodology, review and editing, supervision. YS: writing original draft, data curation. CC: writing, methodology, review and editing, supervision. All authors had read and agreed to the published version of the manuscript.
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Cai, Yr., Song, Y. & Chang, C. Adsorption properties and mechanism of ginkgo biloba leaf-based materials for Cd (II) in aqueous solution. Environ Sci Pollut Res 29, 78499–78508 (2022). https://doi.org/10.1007/s11356-022-21310-x
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DOI: https://doi.org/10.1007/s11356-022-21310-x