Hydrodechloration Of Diclofenac Using Nanoparticles Of Zerovalent Iron (nZVI) and nZVI supported
Abstract
Diclofenac (DFC) is well known as a non-steroidal anti-inflammatory drug and its high production and consumption make it an emerging pollutant. DFC tends to accumulate in aquatic systems inducing toxicity along food chains. Developing alternatives for the elimination of emerging pollutants must be one of the challenges of environmental chemistry, so this research focused on the catalytic hydrodechlorination (HDC) of diclofenac (DCF) using zero-valent iron nanoparticles (nZVI) supported on alumina (Al2O3) and activated carbon (AC). The catalysts were obtained from Fe(NO3)3.9H2O by two reduction methods: extract of pine of the Cypress variety (Cupressus sempervirens) and the second one using NaBH4. The catalysts were characterized by studying the physicochemical and morphological properties characterized by the techniques of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Transmission Electron Microscopy (TEM) and Raman spectroscopy. Catalytic activity tests were performed by means of DCF HDC reactions with each catalyst, constantly monitoring with the high performance liquid chromatography (HPLC) technique. The nZVI-P/CA and nZVI-P/Al2O3 catalysts presented good dispersion and activity, with conversions close to 100%. The nZVI-P/CA showed greater selectivity towards the desired products, while the nZVI-P/Al2O3 was more stable over time. This research addresses the environmental risk of bioaccumulation of this type of organochlorine compounds and proposes a promising solution for their treatment
Keywords
Diclofenac; 2-Anilinophenylacetate; Hydrodechlorination; Zerovalent iron; Nanoparticles.
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