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Enhanced U(VI) separation from aqueous solution with plasma-reduced nZV Fe/Ni doped biochar: Performance and mechanism.

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Title: Enhanced U(VI) separation from aqueous solution with plasma-reduced nZV Fe/Ni doped biochar: Performance and mechanism.
Authors: Shaban, Muhammad1,2 (AUTHOR), Zhu, Yingshan1,2 (AUTHOR), Alharbi, Njud S.3 (AUTHOR), Ren, Xuemei1 (AUTHOR), Chen, Changlun1,4 (AUTHOR) clchen@ipp.ac.cn
Source: Separation & Purification Technology. Jul2025:Part 2, Vol. 361, pN.PAG-N.PAG. 1p.
Subjects: Zero-valent iron, Argon plasmas, Rice hulls, Radioactive elements, Environmental remediation, Uranium
Abstract: [Display omitted] • nZV Fe/Ni doped biochar was prepared through plasma reduction technique. • nZV Fe/Ni doped biochar enhance the separation of U(VI). • Removal mechanisms of U(VI) by nZV Fe/Ni doped biochar involve in adsorption and reduction. • nZV Fe/Ni doped biochar is promising materials for the remediation of U(VI) contamination. Uranium, a radioactive element, and its contamination in the solution will give rise to severe threats to the environment and human health, which draws attention to the development of long-lasting and creative techniques for its removal. This work presented a novel and highly effective adsorbent for uranium separation: biochar (BC) supported nanoscale zero-valent iron/nickel bimetallic composite (nZV BC@Fe/Ni). Hydrogen/argon plasma (70 W for 30 min) was utilized to reduce and uniformly distribute Fe and Ni on BC. The composite's U(VI) removal efficacy examined at four distinct mass ratios of Fe to Ni: 1:0.2, 1:0.4, 1:0.6, and 1:0.8. The nZV BC@Fe/Ni showed a remarkable removal capacity of 150.62 mg g−1 and a removal rate of 93.94 % at pH 6.0 and temperature of 303 K when the mass ratio of Fe to Ni was 1:0.4, demonstrating its high level of effectiveness. In addition, the comparative study among nZV BC@Fe/Ni, BC@Fe/Ni, BC@Fe, BC@Ni, and BC illustrated that the nZV bimetallic composite comes out to be more efficient than others for U(VI) removal. The removal mechanism of U(VI) by nZV BC@Fe/Ni was elucidated. These findings not only highlight the high efficiency of nZV BC@Fe/Ni in removing U(VI) but also suggest its potential for large-scale water treatment applications due to its cost-effectiveness and scalability. The use of rice husk biochar further underscores the environmental benefits by utilizing a renewable waste product. This work provides a promising approach for tackling U(VI) contamination in aqueous solution and can be extended to other harmful metal ions, contributing to more sustainable and affordable environmental remediation strategies. [ABSTRACT FROM AUTHOR]
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Abstract:[Display omitted] • nZV Fe/Ni doped biochar was prepared through plasma reduction technique. • nZV Fe/Ni doped biochar enhance the separation of U(VI). • Removal mechanisms of U(VI) by nZV Fe/Ni doped biochar involve in adsorption and reduction. • nZV Fe/Ni doped biochar is promising materials for the remediation of U(VI) contamination. Uranium, a radioactive element, and its contamination in the solution will give rise to severe threats to the environment and human health, which draws attention to the development of long-lasting and creative techniques for its removal. This work presented a novel and highly effective adsorbent for uranium separation: biochar (BC) supported nanoscale zero-valent iron/nickel bimetallic composite (nZV BC@Fe/Ni). Hydrogen/argon plasma (70 W for 30 min) was utilized to reduce and uniformly distribute Fe and Ni on BC. The composite's U(VI) removal efficacy examined at four distinct mass ratios of Fe to Ni: 1:0.2, 1:0.4, 1:0.6, and 1:0.8. The nZV BC@Fe/Ni showed a remarkable removal capacity of 150.62 mg g−1 and a removal rate of 93.94 % at pH 6.0 and temperature of 303 K when the mass ratio of Fe to Ni was 1:0.4, demonstrating its high level of effectiveness. In addition, the comparative study among nZV BC@Fe/Ni, BC@Fe/Ni, BC@Fe, BC@Ni, and BC illustrated that the nZV bimetallic composite comes out to be more efficient than others for U(VI) removal. The removal mechanism of U(VI) by nZV BC@Fe/Ni was elucidated. These findings not only highlight the high efficiency of nZV BC@Fe/Ni in removing U(VI) but also suggest its potential for large-scale water treatment applications due to its cost-effectiveness and scalability. The use of rice husk biochar further underscores the environmental benefits by utilizing a renewable waste product. This work provides a promising approach for tackling U(VI) contamination in aqueous solution and can be extended to other harmful metal ions, contributing to more sustainable and affordable environmental remediation strategies. [ABSTRACT FROM AUTHOR]
ISSN:13835866
DOI:10.1016/j.seppur.2025.131404