零价铁改性生物炭微球的制备及其对水体中 Cr（Ⅵ）去除性能的研究

To address the challenge of treating highly toxic Cr （Ⅵ) contamination in water, the use of zero-valent iron-modif ied biochar microspheres （FeBCSA) f or Cr（Ⅵ) removal is proposed. First, a three-dimensional porous cage-structured FeBCSA is prepared. Subsequently, its perf ormance in removing Cr（Ⅵ) f rom water is investigated, along with the ef f ects of f actors such as initial concentration, adsorption time, pH, and coexisting ions on the removal perf ormance. Finally, the material’s properties are verif ied through XRD and XPS characterization, and the removal mechanism of Cr（Ⅵ) by FeBCSA is analyzed. The results show that under conditions of pH=4. 06 and an initial Cr（Ⅵ) concentration of 50 mg · L-1, FeBCSA achieves a Cr（Ⅵ) removal ef f iciency of 99. 47%, reducing the post-reaction Cr（Ⅵ) concentration to 0. 27 mg · L-1, which is below the limit specif ied in the Integrated Wastewater Discharge Standard. FeBCSA exhibits significantly higher Cr（Ⅵ) removal ef ficiency compared to non-crosslinked FeBC powder （88. 88%) and FeSA microspheres without bamboo-based biochar f ramework （60. 06%). FeBCSA ef f iciently removes Cr（Ⅵ) f rom water under acidic conditions, making it suitable f or treating acidic Cr（Ⅵ)-containing wastewater. At pH= 4. 06, it demonstrates both high ef f iciency and stability in Cr （Ⅵ) removal, maintaining a high removal rate even in the presence of dif f erent interf ering ions. The ef f iciency of Cr（Ⅵ) removal by FeBCSA is achieved through interf ace reductive-adsorption synergy. This study provides a green remediation material with both high perf ormance and potential f or engineering applications in Cr（Ⅵ) -contaminated water treatment.