Evaluation of Hydrocalumite-Like Compounds as Catalyst Precursors in the Photodegradation of 2,4-Dichlorophenoxyacetic Acid

Sánchez‐Cantú, Manuel; Barcelos-Santiago, Clara; Gómez, Camilo Ernesto; Ramos-Ramírez, Esthela; Peralta, Ma. de Lourdes Ruiz; Tepale, Nancy; González-Coronel, Valeria J.; Mantilla, A.; Tzompantzi, Francisco

doi:10.1155/2016/5256941

Cited by 14 publications

(3 citation statements)

References 64 publications

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“…These electrons react with O 2 to produce radicals O − 2 • , which are the main electron-accepting species. The superoxide radical interacts with water to promote the production of radicals OH • are considered oxidizing agents that promote the mineralization of pollutants and generate CO 2 and produce H 2 O, which are considered final degradation products [29,88]. According to Djebbar and Sehili [89], about 70% of the conversion of 2,4-D involves hydroxyl radicals and about 30% can be associated with the capture of positive holes by adsorbed 2,4-D on semiconductors.…”

Section: Mineralization Of Organic Compoundsmentioning

confidence: 99%

Effect of the Precursor on the Synthesis of ZnO and Its Photocatalytic Activity

et al. 2022

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Zinc nitrate (ZnON) and zinc acetate (ZnOA) were used as precursors for the synthesis of zinc oxide (ZnO) nanoparticles by the sol–gel method. The ZnO powder was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectroscopy, X-ray diffraction (UV–Vis DRS), Fourier transform infrared spectroscopy (FTIR), physisorption of nitrogen, and X-ray photoelectron spectroscopy (XPS). On the other hand, the photocatalytic activity of the samples was tested in the degradation of 2,4-Dichlorophenoxyacetic acid (2,4-D) and 2,4-Dichlorophenol (2,4-DCP) under UV-light irradiation. The ZnON and ZnOA showed polycrystalline irregular structures and rod-like morphology with mean sizes of 40 and 99 nm, respectively. The precursor type influenced the bandgap, crystallite size, surface area, total pore volume, and pore diameter. The XPS results showed high contents of C and N in the ZnO samples, and as a consequence, the solids present remarkable differences in the C/N, O/C, and O/Zn atomic ratios, which significantly influenced the physicochemical characteristics. The ZnON and ZnOA exhibit photocatalytic properties against 2,4-D (74.7 and 90.9%, respectively) and 2,4-DCP (78.4 and 86.7%, respectively) and better performance of ZnOA. These results are promising and indicate the potential to use this material as a photocatalyst to degrade organic pesticides.

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Section: Mineralization Of Organic Compoundsmentioning

confidence: 99%

Effect of the Precursor on the Synthesis of ZnO and Its Photocatalytic Activity

et al. 2022

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“…Although some work was carried out using other LDH solids, mainly hydrotalcite-type (an LDH family similar to hydrocalumite), hydrocalumite solids are very scarcely used for investigating the degradation of emerging pollutants. Sánchez-Cantú et al have used hydrocalumite-type compounds as catalyst precursors in the photodegradation of 2,4-dichlorophenoxyacetid acid [55]. Thus, in this work, hydrocalumites with the theoretical formula Ca 2 Al 1−m Fe m (OH) 6 Cl•2H 2 O, incorporating variable amounts of Fe 3+ , were prepared following the methodology recently reported by Jiménez et al for the preparation of hydrocalumite from aluminum saline slags [8].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Ca2Al1–mFem(OH)6Cl·2H2O-Doped Hydrocalumites and Application of Their Derived Mixed Oxides in the Photodegradation of Ibuprofen

et al. 2022

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Aluminum from saline slags generated during the recycling of this metal, extracted under reflux conditions with aqueous NaOH, was used in the synthesis of hydrocalumite-type solids with the formula Ca2Al1–mFem(OH)6Cl·2H2O. The characterization of the obtained solids was carried out by powder X-ray diffraction, infrared spectroscopy, thermal analysis, element chemical analysis, N2 adsorption-desorption at −196 °C and electron microscopy. The results showed the formation of Layered Double Hydroxide-type compounds whose characteristics varied as the amount of incorporated Fe3+ increased. These solids were calcined at 400 °C and evaluated for the catalytic photodegradation of ibuprofen, showing promising results in the elimination of this drug by advanced oxidation processes. The CaAl photocatalyst (without Fe) showed the best performance under UV light for the photodegradation of ibuprofen.

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“…In order to remove this kind of organic pollutant from water, several methods have been developed, including adsorption, photoinduced degradation, biodegradation, electrochemical degradation and advanced oxidation processes (AOP), using photocatalysts under UVA or solar light irradiation . Several materials have been reported as photocatalysts for these kinds of reactions, including mixed oxides, hydrotalcites, etc . Studies have been made of the effect of doping photocatalytic materials such as titanium dioxide (TiO 2 ) doped with lanthanide ions having 4f electron configurations, for example La 3+ , Nd 3+ , Pr 3+ , Sm 3+ and Eu 3+ , where a significant improvement in the separation rate of the photo‐induced charge carriers, and the consequent enhancement of the photocatalytic activity, has been reported …”

Section: Introductionmentioning

confidence: 99%

Sol-gel synthesis of Tb-doped hydroxyapatite with high performance as photocatalyst for 2, 4 dichlorophenoxyacetic acid mineralization

Jiménez-Flores

Suárez-Quezada

Rojas-Trigos

et al. 2017

J. Chem. Technol. Biotechnol

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BACKGROUND Tb3+doped hydroxyapatite was synthetized by the sol–gel technique, using amounts of the dopant source ranging from 2 to 12 wt%, with respect to the calcium former material. The solids were analyzed using several techniques in order to determine their structural, textural and optical properties. The photoactivity of the materials was tested in the degradation of 2,4‐dichlorophenoxyacetic acid, under UV irradiation. RESULTS The analysis of the samples by X‐ray diffraction, energy‐dispersive X‐ray spectroscopy and Fourier transform infrared spectroscopy indicates the formation of hydroxyapatite with calcium deficiency, with a stoichiometry close to the ideal in the sample doped with 10 wt% of terbium. The highest photoluminescence emission, production of •OH radicals under UV in the terephtalic acid reaction, as well as photocatalytic activity in the photodegradation of 2,4‐dichlorophenoxyacetic acid (2,4‐D) was found in the sample doped with 10 wt% of terbium, reaching almost total degradation and 95% of mineralization of the organic molecule, after 240 min irradiation. CONCLUSION Terbium doping during the synthesis of hydroxyapatite significantly improves its efficiency as photocatalyst. © 2017 Society of Chemical Industry

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Evaluation of Hydrocalumite-Like Compounds as Catalyst Precursors in the Photodegradation of 2,4-Dichlorophenoxyacetic Acid

Cited by 14 publications

References 64 publications

Effect of the Precursor on the Synthesis of ZnO and Its Photocatalytic Activity

Effect of the Precursor on the Synthesis of ZnO and Its Photocatalytic Activity

Preparation of Ca2Al1–mFem(OH)6Cl·2H2O-Doped Hydrocalumites and Application of Their Derived Mixed Oxides in the Photodegradation of Ibuprofen

Sol-gel synthesis of Tb-doped hydroxyapatite with high performance as photocatalyst for 2, 4 dichlorophenoxyacetic acid mineralization

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