Singlet oxygen generation potential of two novel free-base-porphyrin photocatalysts was investigated. The free-base-porphyrin-sensitized Fe₃O₄ magnetic nanoparticles (MNPs) were tested for the degradation of the model pollutant Bisphenol A (BPA) in aqueous solution, for the first time. MNPs with either cubic or spherical shape were synthesized using the sonochemical approach, followed by sensitizing with photoactive 4,4′,4′′,4′′′-(Porphine-5,10,15,20-tetrayl)tetrakis(benzoic acid) (TCPP). The resulted photocatalysts were characterized in detail by scanning and transmission electron microscopy, Brunauer–Emmett–Teller analysis, spectral techniques and vibrating sample magnetometry. The electron spin resonance experiments have confirmed the high activity of the photocatalysts through the efficient formation of singlet oxygen in solution. The optimum operational parameters for BPA degradation were established as follows: 1.0 μmol L⁻¹ BPA, 1.0 g L⁻¹ of photocatalyst, 100 μmol L⁻¹ H₂O₂, under UVA irradiation. In these conditions, the results for both photocatalysts revealed that after only 10 min of reaction, over 64% and ca. 90% of BPA have been removed from solution in the absence and presence of H₂O₂, respectively. Whereas after 60 minutes of treatment, only 24% of BPA in real wastewater effluent samples were removed under UVA irradiation in the absence of H₂O₂, showing the high complexity of real wastewater. Moreover, both photocatalysts were successfully used for BPA removal in three consecutive runs, without significant loss of catalytic features.

研究了两种新型的游离碱卟啉光催化剂的单重态产氧潜力。游离碱卟啉敏化的Fe ₃ O ₄首次测试了磁性纳米颗粒（MNPs）在水溶液中对模型污染物双酚A（BPA）的降解。使用声化学方法合成立方或球形MNP，然后用光敏的4,4'，4''，4''-（Porphine-5,10,15,20-tetrayl）tetrakis（benzoic acid）敏化）（TCPP）。所得的光催化剂通过扫描和透射电子显微镜，Brunauer-Emmett-Teller分析，光谱技术和振动样品磁强分析法进行了详细表征。电子自旋共振实验已经通过在溶液中有效形成单重态氧证实了光催化剂的高活性。建立BPA降解的最佳操作参数如下：1.0μmolL ^-1 BPA，1.0 g L在UVA照射下，光催化剂^-1的浓度为100μmolL ^-1 H ₂ O ₂。在这些条件下，两种光催化剂的结果都表明，仅反应10分钟后，超过64％的催化剂就可以回收。在不存在和存在H ₂ O ₂的情况下，分别从溶液中去除了90％的BPA 。处理60分钟后，在没有H ₂ O ₂的情况下，在UVA照射下，实际废水流出样品中的BPA仅去除了24％，这表明实际废水的复杂性很高。此外，两种光催化剂已成功地用于连续三个运行中的BPA去除，而没有明显丧失催化性能。