Carbon-supported PO₄³⁻/Fe³⁺-based nanocomposites were prepared by a thermal hydrolysis method. The influence of the molar ratio PO₄³⁻/Fe³⁺ upon the kinetics of adsorption and photocatalytic degradation of methylene blue was evaluated. In terms of the surface reaction rate, up to 8 times higher photoactivity (99 % dye conversion) than the commercial F400 activated carbon (39 % dye conversion) was found for the sample containing a ratio PO₄³⁻/Fe³⁺ ca. 0.5. This composite was selected for a carefully study of spin-trapping of OH and O₂‾ adduct formation. O₂‾. A preferential formation of O₂‾ and a strong inhibiting effect was observed in the formation of these reactive oxygen species attributed to the phosphate-based groups. In addition, a composite was prepared using the best carbon-supported P-Fe-based photocatalysts and a commercial TiO₂. An inhibiting effect of the photocatalytic activity of TiO₂ was observed in presence of P-containing catalysts in agreement with the decrease in the spin-trapping signals. A mechanism for the trimer aggregation of methylene blue adsorption on carbon-supported P-Fe-based nanocomposite following degradation under UV–vis irradiation is proposed.

通过热水解法制备碳负载的PO ₄ ^3- / Fe ³⁺基纳米复合材料。评价了摩尔比PO ₄ ^3- / Fe ³⁺对亚甲基蓝的吸附动力学和光催化降解动力学的影响。就表面反应速率而言，发现含有比例为PO ₄ ^3- / Fe ³⁺ ca的样品的光活性（99％染料转化率）是商业F400活性炭（39％染料转化率）的8倍。0.5。该复合物选择的自旋捕集的仔细研究OH和O ₂〜加合物的形成。Ø ₂〜。在这些归因于磷酸酯基的活性氧的形成中，观察到O _{2 2的}优先形成和强抑制作用。此外，使用最佳的碳载P-Fe基光催化剂和市售TiO ₂制备了复合材料。与自旋俘获信号的减少一致，在含P的催化剂存在下观察到TiO ₂的光催化活性的抑制作用。提出了在紫外可见辐射降解后，碳负载的P-Fe基纳米复合材料吸附亚甲基蓝的三聚体聚集机理。