Perfluorooctanoic acid (PFOA, C₇F₁₅COOH) has raised global concerns because of its ubiquitous occurrence and resistance to most conventional water treatment techniques. In this work, we first used metal–organic framework (MOF) derived In₂O₃ nanospheres (In₂O₃ NS) and rods for photocatalytic degradation of PFOA under UV light irradiation. XRD was used to confirm the successful preparation of MOF-derived In₂O₃. SEM images show that In₂O₃ NS and rods were obtained by the calcination of different indium (III)–benzenedicarboxylate (In–BDC) MOFs. In₂O₃ NS and rods demonstrated enhanced performances for photodegradation of PFOA compared with the commercial In₂O₃. The results show that PFOA was completely decomposed in 3 h, and its shorter-chain products were further mineralized in 6 h in the presence of In₂O₃ NS under 254 nm UV light irradiation. MOF-derived In₂O₃ is super-hydrophilic with a contact angle of ∼20° and possesses larger specific surface area, which facilitate the adsorption and tight coordination of PFOA with In₂O₃. Moreover, EIS Nyquist spectra show that the as-prepared In₂O₃ NS and rods have higher efficiency in charge separation and migration compared with the commercial In₂O₃. All these properties contribute to the destruction of PFOA.

中文翻译：

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易于制备亲水性In2O3纳米球和棒，具有改善的性能，可用于PFOA的光催化降解

全氟辛酸（PFOA，C ₇ F ₁₅ COOH）因其普遍存在且对大多数常规水处理技术具有抵抗力而引起了全球关注。在这项工作中，我们首先使用衍生自In ₂ O ₃纳米球（In ₂ O ₃ NS）和棒的金属-有机骨架（MOF）在紫外光照射下光催化降解PFOA。用XRD证实成功制备了MOF衍生的In ₂ O ₃。SEM图像显示，通过煅烧不同的铟（III）-苯二甲酸（In-BDC）MOF ，可以得到In ₂ O ₃ NS和棒。在与商用In ₂ O ₃相比， ₂ O ₃ NS和棒显示了PFOA光降解的增强性能。结果表明，在254 nm紫外线照射下，在In ₂ O ₃ NS存在下，PFOA在3 h内完全分解，短链产物在6 h内进一步矿化。MOF衍生的In ₂ O ₃具有超亲水性，接触角约为20°，并且具有较大的比表面积，这有利于PFOA与In ₂ O ₃的吸附和紧密配位。此外，EIS Nyquist光谱表明，所制备的In ₂ O ₃与商业化的In ₂ O ₃相比，NS和棒在电荷分离和迁移方面具有更高的效率。所有这些特性都有助于破坏PFOA。