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Fe3O4-loaded phosphoric acid-modified walnut shell biochar for uranium adsorption from simulated groundwater
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DOI：10.1039/d6nj00709k.png)
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Abstract
En 中文
Uranium contamination in groundwater poses a serious threat to human health and ecological security, necessitating the development of efficient and sustainable remediation materials. In this work, a magnetic biochar composite, Fe3O4-loaded phosphoric acid-modified walnut shell biochar (Fe3O4/P-WSBC), was synthesized and evaluated for U(VI) removal from simulated groundwater. Batch adsorption experiments showed that equilibrium was reached within 60 min, and the kinetic data were well described by the pseudo-second-order model (R-2 = 0.998). The Langmuir isotherm provided the best fit, yielding a maximum monolayer adsorption capacity of Q(max) = 23.05 mg g(-1) at 40 degrees C. Thermodynamic analysis indicated that the adsorption process was spontaneous (DG < 0) and endothermic (DH > 0). Fe3O4/P-WSBC shows good U(VI) selectivity against common coexisting ions, with removal efficiency decreasing by <10% even with Cu2+, Mn2+, Zn2+, K+, especially Cu2+. After five consecutive adsorption-desorption cycles, the adsorbent still exhibited a good adsorption capability. X-ray photoelectron spectroscopy (XPS) revealed that U(VI) removal involved electrostatic attraction and complexation with surface-OH, C-O, and CQO groups, accompanied by partial reduction of U(VI) to U(IV) by Fe2+. These quantitative results establish Fe3O4/P-WSBC as an efficient and reusable material for the remediation of uranium-contaminated groundwater.
Keywords:
ACTIVATED CARBON
POTENTIAL APPLICATION
WASTE-WATER
REMOVAL
U(VI)
ADSORBENT
EU(III)
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