Photocatalytic Degradation of 2,4-Dichlorophenol on NiAl-Mixed Oxides Derivatives of Activated Layered Double Hydroxides

Ramos-Ramírez, Esthela; Ortega, Norma Leticia Gutiérrez; Tzompantzi-Morales, Francisco; Barrera-Rodríguez, Arturo; Castillo-Rodríguez, J.C.; Tzompantzi-Flores, C.; Santolalla-Vargas, C.E.; Guevara-Hornedo, María del Pilar

doi:10.1007/s11244-020-01269-0

Cited by 12 publications

(9 citation statements)

References 51 publications

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“…According to these data, the degradation rate of both pollutants is higher than the mineralization process. Ramos-Ramírez et al [6] mentioned that this phenomenon is attributed to the different absorption bands detected in the UV-Vis study, particularly for the aromatic group located at 210.5 nm. They suggested that the absence of oxygen limits According to these data, the degradation rate of both pollutants is higher than the mineralization process.…”

Section: Mineralization Of Organic Compoundsmentioning

confidence: 97%

“…They suggested that the absence of oxygen limits According to these data, the degradation rate of both pollutants is higher than the mineralization process. Ramos-Ramírez et al [6] mentioned that this phenomenon is attributed to the different absorption bands detected in the UV-Vis study, particularly for the aromatic group located at 210.5 nm. They suggested that the absence of oxygen limits the formation of superoxide radicals, which promotes partial dechlorination of organic pollutants; therefore, the aromatic structure of phenol present in both studied pollutants is maintained, avoiding the total degradation and mineralization.…”

Section: Mineralization Of Organic Compoundsmentioning

confidence: 97%

“…The absorbance spectra in the photodegradation of 2,4-D and 2,4-DCP exhibited three characteristic absorption bands centered at 210.5, 245, and 283 nm for 2,4-D, and 210.5, 245, and 285 nm for 2,4-DCP. The primary and secondary transitions were due to the aromatic group, while the third band belongs to the n → π* transition, which is attributed to the C-Cl bond [6]. The shoulder absorption corresponding to 2,4-D (283 nm) and 2,4-DCP (285 nm) showed a significant decrease as the irradiation time increased (360 min), indicating the degradation of 2,4-D and 2,4-DCP, respectively, which is associated with the decomposition of the organic compounds in both catalysts studied [81].…”

Section: Degradation Of Organic Compoundsmentioning

confidence: 99%

“…Although the Federal Drugs Administration (FDA) and World Health Organization (WHO) have banned these products in Mexico, they are still used [3][4][5]. When the concentration of 2,4 D and 2,4-DCP is significant, these compounds can reach the aquifers and lead to intestinal diseases, and their accumulation in humans can cause carcinogenesis after water consumption [6]; the presence of these compounds in water has been reported [7,8]. Furthermore, the Advance Oxidation Process (AOP) is a technological option for water treatment, in which photocatalysts play an important role [9].…”

Section: Introductionmentioning

confidence: 99%

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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: 97%

Section: Mineralization Of Organic Compoundsmentioning

confidence: 97%

Section: Degradation Of Organic Compoundsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…Figure 1 shows the laminar structure of a hydrotalcite Mg/Al with carbonate ions and water molecules in the interlaminar space. Due to its anion exchange capacity in the interlaminar space, hydrotalcites have been used to remove from water mono-, di-, and polyvalent anions, organochlorine compounds [30,31], heavy metals [32,33], and synthetic dyes [5,[34][35][36]. In addition, the chemical composition of hydrotalcites, as well as their physicochemical properties, have allowed their application in various areas such as catalysis [37], electrocatalysis [38,39], energy storage [40,41], and photocatalysis [5,29,31].…”

Section: Introductionmentioning

confidence: 99%

Photoelectrocatalytic Degradation of Congo Red Dye with Activated Hydrotalcites and Copper Anode

et al. 2021

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Photoelectrocatalysis is a novel technique that combines heterogeneous photocatalysis with the application of an electric field to the system through electrodes for the degradation of organic contaminants in aqueous systems, mainly of toxic dyes. The efficiency of these combined processes depends on the semiconductor properties of the catalysts, as well as on the anodic capacity of the electrode. In this study, we propose the use of active hydrotalcites in the degradation of Congo red dye through processes assisted by ultraviolet (UV) irradiation and electric current. Our research focused on evaluating the degradation capacity of Congo red by means of photolysis, catalysis, photocatalysis, electrocatalysis, and photoelectrocatalysis, as well as identifying the effect of the properties of the active hydrotalcites in these processes. The results show that a maximum degradation was reached with the photoelectrocatalysis process with active hydrotalcites and a copper anode at 6 h with 95% in a half-life of 0.36 h. The degradation is favored by the attack of the OH• radicals under double bonds in the diazo groups where the electrode produces Cu2+ ions, and with the photogenerated electrons, the recombination speed of the electron–hole in the hydrotalcite catalyst is reduced until the complete degradation.

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