科研之友
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摘要
A novelty and economy of [3-cyclodextrin ([3-CD) functionalized sycamore leaf-based biochar (BC) was synthesized, namely [3-BC, and was used to study the potential adsorption mechanism of Pb(II) in water. Through scanning electron microscopy, Brunauer-Emmett-Teller, Fourier-transform infra-red spectroscopy and X-ray diffraction characterization analyses, it was confirmed that the [3-CD was successfully loaded. A succession of kinetic adsorption, isothermal adsorption and influenc-ing factor experiments were carried out. The results showed that when compared with BC, the time for [3-BC to reach adsorption equilibrium was reduced by half, and the removal efficiency increased from 89.84% to 98.48%. Meanwhile, the optimal pH was 5.0 and the dosage of [3-BC was 0.05 g. The pseudo-second model and Freundlich isotherm model fitted the adsorption process for [3-BC well. The maximum adsorption of Pb(II) in a single system was 151.2 mg g-1, and the adsorp-tion of binary systems was 92.03 mg g-1, it was proved that Cd(II) has exert a competitive effect on Pb(II). The results demonstrated that [3-BC has efficient and fast removal of Pb(II), it was primar-ily attributed to electrostatic action, complexation, hydrogen bonding of a wealth of oxygenated groups on the surface, and host-object interaction in the [3-CD cavity. This research confirmed the extraordinary potential of [3-BC to treat heavy metals in wastewater.
