Nanoparticles of ZnO and Mg-doped ZnO: Synthesis, characterization and efficient removal of methyl orange (MO) from aqueous solution

Photocatalytic behavior of TiO2 and TiO2/CS nanoparticles under UV irradiation

“…The patterns have been indexed for the JCPDS 89-4921 reported in Ref [4], with crystal structure corresponding to the tetragonal anatase phase. The crystallite size estimation was determined using Scherrer´s formula reported in Ref [7]. Here, the (101) plane was fitted by a Gaussian function to determine the 2 peak and the line broadening β (FWHM) of the NPs.…”

“…This procedure was made for each sample. In addition, a calibration plot based on the Beer-Lambert law was established by relating the absorbance to the concentration, and the percentage of MO degradation was calculated using the expression % 𝜂 = (𝐶 0 −𝐶) 𝐶 0 𝑥 100 % [7], where Co is the initial concentration and C is the concentration of MO under UV light.…”

Nano-biointerface entre semiconductor y membrana celular: fenómenos fisicoquímicos implicados en la nanotoxicidad y la capacidad antifúngica de las nanopartículas de óxido de cinc

“…Para ilustrar el efecto de las ZnO-NPs en ciertos sistemas biológicos, se indican a continuación resultados obtenidos recientemente en nuestro laboratorio después de una rigurosa observancia de los protocolos establecidos para realizar los ensayos correspondientes, los cuales se describen detalladamente en los artículos publicados y en los trabajos referenciados. Además, las ZnO-NPs empleadas se sintetizaron en nuestro laboratorio siguiendo rutas químicas, como el método diol (Patiño-Portela, et al, 2021;Arciniegas-Grijalba, et al, 2019;Erazo, et al, 2019), el sol-gel (Arciniegas-Grijalba, et al, 2017, el complejo polimérico de Pechini (Vargas, et al, 2021), o precipitación controlada (Rodríguez-Páez, 2013; Rodríguez-Páez, et al, 2019).…”

“…Las ZnO-NPs utilizadas por Benítez-Salazar en su trabajo de grado (2021), se obtuvieron empleando el método del complejo polimérico de Pechini (Vargas, et al, 2021). Estas nanopartículas presentaron una morfología esferoidal, con un tamaño de partícula primaria menor a los 100 nm, las cuales experimentaron una aglomeración especial generando partículas secundarias con forma de barras o láminas, del orden de las micras.…”

Effect of Ethylene Glycol: Citric Acid Molar Ratio and pH on the Morphology, Vibrational, Optical and Electronic Properties of TiO2 and CuO Powders Synthesized by Pechini Method

“…An ongoing quest of the scientific community is discovering the ways in which the synthesis might influence the optical and electronic properties of these materials. Metal oxide-based semiconductor materials have been obtained using different methods, including chemical vapor synthesis [ 3 ], sol-gel [ 4 , 5 ], hydrothermal [ 6 ], controlled precipitation [ 7 ] and polymeric precursor [ 8 ]. The polymeric precursor method, commonly known as the Pechini method, is one of the most economical and easily implemented methods to produce metal complexes from concentrated solutions of polyfunctional organic acids, salts or oxides of the cations required for the formation of metal oxides [ 9 ]; it combines low-temperature processing and versatility in the proportions of citric acid and metal cations to control the stoichiometry and the morphology of the particles and/or agglomerates, obtain compositional homogeneity and ensure low toxicity to produce a single-phase nanometric powder [ 10 , 11 ].…”