The preparation of amino-reinforced phosphorylated biochar for efficient uranium adsorption

Zhang, Nan; Li, Jinfeng; Tian, Bo; Li, Tuo; Zhang, Jianwei; Zhao, Haitao

doi:10.1007/s10967-023-09025-w

Cited by 4 publications

(1 citation statement)

References 42 publications

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“…Figure 6a represents the high-resolution XPS full spectra of PC and PCNi3. The characteristic peaks located at ~284.9 eV, ~400.4 eV, ~532.8 eV, and ~134.4 eV for the two samples correspond to C 1s, N 1s, O 1s, and P 2p, respectively, which can be attributed to by-products produced by H3PO4 activation and the self-contained nitrogen element in the biomass itself [31]. Compared with PC, the peak that represents Ni 2p (~856.9 eV) appeared in the XPS pattern of PCNi3, reconfirming the successful loading of nickel onto the surface of the biochar.…”

Section: The Physicochemical Properties Of Adsorbentsmentioning

confidence: 97%

Enhancing Cr (VI) Adsorption of Chestnut Shell Biochar through H3PO4 Activation and Nickel Doping

Hu,

Zhang,

Chen

et al. 2024

Molecules

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A high-efficiency nickel-doped porous biochar (PCNi3) has been successfully synthesized from chestnut shell waste via a two-step chemical activation treatment with H3PO4. The influences of microstructure, surface morphology, elemental composition, surface functional groups, specific surface area, porosity, pore-size distribution, and chemical properties of the surface state on the removal of Cr (VI) from water were thoroughly investigated by using XRD, FESEM, FTIR, Raman, BET, and XPS testing methods, N2 adsorption, and XPS testing techniques respectively. The results indicate that the treatment of H3PO4 activation and nickel doping can effectively improve microstructure characteristics, thus promoting Cr (VI) adsorption capacity. The effects of initial solution pH, solution concentration, time, and temperature on remediation are revealed. The Cr (VI) uptake experiments imply that the adsorption curves of PCNi3 fit well with the Freundlich model, the pseudo-second-order kinetic model, and the Elovich model. The adsorption process of PCNi3 can be regarded as a spontaneous endothermic reaction limited by diffusion among particles and porosity. The adsorption mechanisms of PCNi3 are ion exchange, complexation, electrostatic adsorption, and coprecipitation with the assistance of surface active sites, porosity, Ni0 particles, and Ni7P3. With these advantages, PCNi3 reveals an extraordinary Cr (VI) removal capacity and a strong ability to reduce Cr (VI) to Cr (III).

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Section: The Physicochemical Properties Of Adsorbentsmentioning

confidence: 97%