SCHEDULED MAINTENANCE
Facile preparation of hydrophilic In2O3 nanospheres and rods with improved performances for photocatalytic degradation of PFOA†
Abstract
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.
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