Novel Magnetic Pomelo Peel Biochar for Enhancing Pb(II) And Cu(II) Adsorption: Performance and Mechanism
2020
Chen, Yaoning | Liu, Yihuan | Li, Yuanping | Chen, Yanrong | Wu, Yanxin | Li, Hui | Wang, Sha | Peng, Zhen | Xu, Ran | Zeng, Ziping
A novel magnetic pomelo peel biochar (MPPB) was prepared by hydrothermal pretreatment coupled with pyrolysis at 550 °C. Batch experiments were employed to investigate adsorption properties on biochar for Pb(II) and Cu(II). FTIR, SEM, XRD, XPS, and zeta potential were applied to characterize the biochar. The surface morphology of MPPB was rough, loose, and negatively charged and contained carboxyl and hydroxyl functional groups, which were favorable for adsorption. The MPPB showed excellent adsorption performances for Pb(II) with maximum capacity (205.391 mg/g), and the maximum amount on MPPB for Cu(II) was 81.909 mg/g. Pseudo-second-order kinetic and Langmuir isotherm depicted well with adsorption behavior on biochar. It could be concluded that chemical complexation occurs during metal adsorption from change of the spectra of XPS and XRD. The competitive relation of coexisting cations with target metal inferred that ion exchange is not a key mechanism. Chemical complexation with functional groups and electrostatic attraction between MPPB and metals are the main adsorption mechanisms. The MPPB developed from pomelo peel was testified to be a potential adsorbent for water purification.
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