负载疏水敏化剂的磁性纳米粒子-聚合物复合材料用于光降解偶氮染料,ACS Applied Nano Materials

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负载疏水敏化剂的磁性纳米粒子-聚合物复合材料用于光降解偶氮染料
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2022-04-28 , DOI: 10.1021/acsanm.2c01453
María Belén Rivas Aiello ₁ , Gabriel C. Lavorato ₁ , Julio C. Azcárate ₂ , Juan M. Orozco-Henao ₃ , Pedro Mendoza Zélis ₃ , Carlos J. Cobos ₁ , Mariano H. Fonticelli ₁ , Daniel O. Mártire ₁ , Carolina Vericat ₁

Affiliation

油酸酯保护的氧化铁磁性纳米粒子 (MNPs) 用两亲梳状聚合物聚 (马来酸酐alt -1-十八碳烯) (PMAO) 封装，以实现向水性介质的相转移并将所得的 MNP-PMAO 组件与苯那酮加载(PN)，一种疏水光敏剂，单线态氧产生的量子产率接近统一。稳态荧光测量与密度泛函理论计算以及发射寿命实验相辅相成，使我们得出结论，混合纳米材料中的 PN 分子确实位于疏水环境中。此外，激光闪光光解测定证实了 PN 三重态的产生及其被 O _2猝灭，表明单线态分子氧（¹ O ₂）的形成。对于边长为 23 nm 的单分散磁性纳米立方体 (MNC)，可以通过磁倾析有效去除 MNC-PMAO-PN 纳米杂化物。我们对偶氮衍生物酸性黑 10B (AB10B) 进行了光降解实验，这是一种常用于化妆品行业且存在于废水中的染料。^{在存在 MNC-PMAO-PN 组件（200 mg L -1}，以氧化铁浓度表示）的情况下，将 0.01 mM AB10B 溶液辐照 120 分钟导致染料在 pH 值约为 6 时分解 76%。与其他基于 Fenton 过程的方法，我们的策略在不添加 H ₂ O _{2的情况下达到显着的光降解效率}或酸。类似的系统可用于封装疏水性光敏剂以用于其他目的，例如细菌灭活以及光动力和磁热疗联合治疗。

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Magnetic Nanoparticle–Polymer Composites Loaded with Hydrophobic Sensitizers for Photodegradation of Azoic Dyes

Oleate-protected iron oxide magnetic nanoparticles (MNPs) were encapsulated with amphiphilic comb polymer poly(maleic anhydride alt-1-octadecene) (PMAO) in order to achieve the phase transfer to aqueous media and to load the resulting MNP–PMAO assemblies with phenalenone (PN), a hydrophobic photosensitizer with a quantum yield of singlet oxygen production close to unity. Steady-state fluorescence measurements complemented with density functional theory calculations, together with emission lifetime experiments, led us to conclude that PN molecules in the hybrid nanomaterial are indeed localized in a hydrophobic environment. In addition, laser flash-photolysis assays confirmed the generation of the triplet state of PN and its quenching by O₂, an indication of the formation of singlet molecular oxygen (¹O₂). For monodisperse magnetic nanocubes (MNCs) 23 nm in edge length, the MNC–PMAO–PN nanohybrids can be efficiently removed by magnetic decantation. We performed photodegradation experiments of azoic derivative acid black 10B (AB10B), a dye commonly used in the cosmetic industry and which is found in wastewaters. Irradiation of a 0.01 mM AB10B solution for 120 min in the presence of the MNC–PMAO–PN assemblies (200 mg L⁻¹, expressed as iron oxide concentration) led to a 76% decomposition of the dye at pH around 6. Unlike other methods based on Fenton processes, our strategy reaches a significant photodegradation efficiency without the addition of H₂O₂ or acids. Similar systems could be used to encapsulate hydrophobic photosensitizers for other purposes, such as bacterial inactivation and combined photodynamic and magnetic hyperthermia therapies.

更新日期：2022-04-28

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