Adsorption of low-concentration mercury in water by 3D cyclodextrin/graphene composites: Synergistic effect and enhancement mechanism
作者： Peipeng Qiu , Shuting Wang , Chen Tian , Zhang Lin
DOI: 10.1016/J.ENVPOL.2019.06.034
关键词:
摘要: Abstract The efficient removal of mercury from aqueous media remains a severe challenge in ensuring environmental safety, especially for low-concentration mercury, which requires adsorbents with high affinity. In this work, we reported nanocomposite β-cyclodextrin and three-dimensional graphene (3D CD@RGO) to enhance the adsorption affinity capacity low concentrations. Characterization revealed that cyclodextrin was well dispersed on 3D support structure provide highly exposed hydroxyl groups. Adsorption experiments showed CD@RGO exhibited different behaviors within concentration ranges 0.2–4.0 mg/L 4.0–10.0 mg/L, former range ( K L = 10.05 L/mg) 1.5 times higher than latter = 6.69 L/mg). Moreover, had efficiency 96.6% superb (172.09 L/g) at C e = 0.01 mg/L, is 6.70 41.25 RGO RCD (physical mixture cyclodextrin), respectively, indicating synergistic effect adsorption. This enhancement can be attributed transformation mechanism outer-sphere force electrostatic interaction inner-sphere surface complexation CD@RGO.
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