Este estudio tiene como objetivo explorar, por primera vez, el efecto de las especies de aniones en la actividad fotocatalítica de los compuestos TiB₂, TiC y TiN para la producción de H₂. Por lo tanto, los compuestos de titanio no-óxidos se han investigado como materiales semiconductores alternativos para reemplazar al TiO₂. En este caso, se evaluaron estos materiales no-óxidos como fotocatalizadores para la producción de hidrógeno debido a sus energías negativas de la banda de conducción, que facilitan la acumulación de electrones en la superficie y promueven la reacción de división del agua...

Los polvos de g-C₃N₄ fueron tratados mediante la técnica de microondas en tres medios diferentes, tanto acuosos como orgánicos (HNO₃, NaOH y N,N-dimetilformamida). Todos los polvos fueron analizados por difracción de rayos X (XRD), revelando que el g-C₃N₄ mantiene su estructura. La morfología de las muestras se analizó mediante microscopía electrónica de barrido, donde las micrografías revelan que la modificación ocurre en la superficie del g-C₃N₄. La actividad fotocatalítica de las muestras se evaluó en la degradación de la ciprofloxacina, la producción de hidrógeno y en la oxidación parcial selectiva del 4-metoxibencilalcohol (4-MBA) a su aldehído...

La teoría del comportamiento planificado de Ajzen (1991) da un enfoque pertinente para estudiar la intención hacia un comportamiento deseado, en este trabajo se emplea un modelo de intención emprendedora desarrollado por Liñán et al.(2013). La investigación tiene como objetivo determinar si existe una influencia positiva y significativa entre el enfoque de la teoría del comportamiento planificado medido por las variables Normas Subjetivas (NS), Actitud Personal (AP), y Comportamiento Conductual Percibido (CCP) y la Intención Emprendedora de los estudiantes de las carreras que se imparte en la Universidad. Incorporando también en el modelo el rol de la cultura junto con las motivaciones, habilidades y conocimiento del ambiente empresarial...

This research reports obtaining the bismuth molybdate phase α-Bi₂Mo₃O₁₂ by a microwave-assisted hydrothermal method using sustainable environmental conditions compared to the typical material synthesis by solid-state reaction. The α-Bi₂Mo₃O₁₂ sample obtained by microwave assistance (BMO) was evaluated for the photocatalytic degradation of tetracycline (TC) using simulated sunlight and compared against the same phase obtained by the typical solid-state reaction (BSS). BMO presented a higher TC degradation efficiency (56%) than BSS (35%)...

g-C₃N₄ powders were double exfoliated by means of the microwave technique and heat treatment. X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), N₂ physisorption, and UV–visible (UV–vis) were carried out for the evaluation of composition, structure, morphology, surface area, and optical properties. XRD and FTIR analysis confirmed that the crystal structure and functional groups of g-C₃N₄ is maintained after the double exfoliation...

This chapter discusses topics related to tungsten trioxide (WO₃) and its application in water treatment. It examines the influence of morphology, the effect of the starting precursor on the synthesis and crystalline structure, on the photocatalytic properties of WO₃. It also addresses the synthesis of nanostructures, composites, and/or heterostructures of WO₃ to increase their photocatalytic performance...

CuO thin films were obtained by DC Sputtering varying the deposit time: 10, 20 and 30 min with the thickness of 60, 120 and 180 nm, respectively. These films were used photocatalysts in two different photocatalytic processes: hydrogen production and CO₂ photoreduction under simulated sunlight. The film with 120 nm of thickness generated the highest amount of hydrogen (24 μmol) of the films tested. Furthermore, the ellipsometry results showed that this film absorbs the simulated light in the UV-to-IR region...

KBiO3/g-C3N4 composites were prepared under microwave irradiation to different weight ratio of KBiO₃ (5, 10, 20, 30, 40, 50, 60, 70 80, 90 %wt) using a Mars-6 for 30 min at 100 W...

TiO₂ nanorods were prepare by hydrothermal method over TiO₂ seed layers deposited by DC Sputtering. From the XRD structural characterization, it has been stated that TiO₂ seed layer present mainly the anatase phase with some contributions of rutile phase, while for TiO₂ nanorods are presented the rutile phase...

BiVO₄ film has been fabricated using a screen printing process on common glass. XRD analysis indicated that the film after calcination at 400 °C for 2 h appear to be the optimal conditions...

KBiO₃ was synthesized by three methods: chemical substitution, hydrothermal and sonochemical. All reaction products were analyzed by means of X-ray powder diffraction and reveals that KBiO₃ presents a cubic structure...

In this work, the WO₃/g-C₃N₄ heterojunction system has been prepared through a sonochemical process at 37 kHz. The composites were characterized by powder X-ray diffraction, diffuse reflectance and Fourier transform infrared spectroscopies, scanning electron microscopy and nitrogen adsorption-desorption measurements. The photocatalytic activity of the coupled system was evaluated by the photodegradation of the Orange G dye and the ciprofloxacin antibiotic under solar-like irradiation conditions....

Novel Fe-impregnated BiVO₄ was synthetized by a sonochemistry method, then the Fe-impregnation was prepared through an easy and low-cost method by the directly hydrolyzes iron salt onto BiVO₄ nanoparticles. Scanning electron microscope equipped with an energy dispersive spectrometer analysis indicated the presence of Fe on the impregnated BiVO₄. Half-time of Fe-BiVO₄ (1%) sample was 10 times greater than BiVO₄ pure in the ciprofloxacin degradation by a dual effect process under UV-Vis light irradiation...

TiO₂ nanorods were prepared by hydrothermal method over TiO₂ seed layers deposited by DC Sputtering. From the XRD structural characterization, it has been stated that TiO₂ seed layer present mainly the anatase phase with some contributions of rutile phase, while for TiO₂ nanorods, the rutile phase is present. The thin film thickness were measured using a profilometer, resulting in a thickness of 310 nm for the seed layer and ∼400 nm for TiO₂ nanorods. ...

In this work, visible-active BaBiO₃ perovskite photocatalysts were prepared by solid state and hydrothermal methods. The physicochemical characterization of the materials was carried out by XRD, SEM, UV–vis, PL and EIS analysis. It was found that the materials exhibit a base centered monoclinic structure with morphology of dense irregular particles and an absorption edge near to 620nm (∼2eV) in the visible region...

Limited visible light absorption, slow charge transference, and high recombination are some of the main problems associated with low efficiency in photocatalytic processes. For these reasons, in the present work, we develope novel zirconate–FeS₂ heterostructured photocatalysts with improved visible light harvesting, effective charge separation and high photocatalytic water splitting performance.

In the present work, we report the electrophoretic deposition of lead molybdate nanoparticles which were synthesized by an ultrasonic-assisted method using Pb(NO₃)₂ and H₂MoO₄ as precursors...

This work reports the synthesis of a variety of materials with an ilmenite-type structure MTiO₃ formula, where M= Fe, Co, and Ni, these materials were synthesized by the method of solvo-combustion, a simple and rapid method...

Novel visible light-driven PbMoO₄/g-C₃N₄ hybrid composites were synthesized with loadings 0, 20, 50, 80 and 100 wt.% of PbMoO₄ by sonochemical method. The PbMoO₄/g-C₃N₄ hybrid composites were characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS)...

Copper oxides are considered efficient photocatalysts for H₂ generation. In addition, due to their interesting properties such as surface plasmon resonance, they are applied in photo-induced reactions. In heterogeneous photocatalysis, CuO and Cu₂O are the main oxides...

CaBi₆O₁₀ nanoplates were synthesized by a sonochemical method using a high-power ultrasonic processor. Also, the CaBi₆O₁₀ was synthesized by an impregnation-calcination method in order to compare the effect of the synthesis method on the photocatalytic activity of the photocatalyst...

The graphite-like C₃N₄ was prepared by means the polycondensation of melamine at 500 C for 4 h. The polymeric photocatalyst was characterized by several techniques such as X-ray powder diffraction (XRD), UV–vis diffuse reflectance spectroscopy (DRS) and scanning electron microscopy (SEM)...

Bi₂O₃ nanoplates were synthesized by an ultrasound-assisted precipitation method in aqueous solution with different times of exposure to ultrasound radiation. The formation of Bi₂O₃ oxide with a monoclinic structure was confirmed by X-ray powder diffraction (XRD)...

In the present work WO₃ nanoparticles by two synthesis methods were prepared: microwave assisted hydrothermal and ultrasound synthesis method assisted with CTAB. The nanoparticles were characterized by XRD, SEM, UV-vis and surface area by BET method...

BiVO₄ with monoclinic-type structure were successfully synthesized by microwave-assisted hydrothermal method (BiMH) and hydrothermal reaction (BiH500) in aqueous medium. The materials were characterized by X-ray diffraction, scanning electron microscopy, Barrett–Emmett–Teller technique...

In this study, it was synthesized strontium zirconate (SrZrO₃) powders using three methods: a traditional solid-state reaction, molten salts and ultrasound-assisted synthesis. The structural, morphological, optical and textural properties of the prepared powders were investigated using...

WO₃ 2D nanostructures have been prepared by ultrasound synthesis method assisted with CTAB using different molar ratios. The formation of monoclinic crystal structure of WO₃ was confirmed by X-ray powder diffraction (XRD)....

Significant attention has been paid on the photocatalytic production of hydrogen from water splitting by using semiconductor materials. The NaTaO₃ phase has been studied for this purpose due to its high potential to generate charge carriers by absorbing the photons energy...

WO₃ nanoparticles with hexagonal and monoclinic structures were synthesized via a microwave-assisted hydrothermal process without the use of any additives in which the microwave hydrothermal reaction time was 30 or 60 min and was followed by different thermal treatments...

This paper reports the development of a solvo-combustion synthesis route using acetylacetone as the novel fuel and ethanol as the solvent, with water excluded from the system. MoO₃ and Sm₂O₃ materials synthesized by this route were characterized by various physicochemical techniques...

Tungsten(VI) oxide (WO₃) powders have been synthesized from a precursor material prepared via a simple precipitation method in ethanol medium followed by thermal treatments at 500 and 700 °C. Structural characterization by X-ray Rietveld refinement...

WO₃ nanoparticles were synthesized by citric acid-assisted precipitation method using a 1:1.5 molar ratio of ammonium paratungstate hydrate (H₄₂N₁₀O₄₂W₁₂·xH₂O):citric acid (C₆H₈O₇). The formation of monoclinic crystal structure of WO₃ at different temperatures was confirmed by...

WO₃ nanoparticles were synthesized by a precipitation method in presence of urea at different calcination temperatures. The characterization of the WO₃ samples was carried out by X-ray powder diffraction (XRD)...

WO₃ nanoparticles were synthesized by the precipitation method varying the time employed in the formation of their precursor in aqueous media and the calcination temperature. The WO₃ crystallization process and morphology of the synthesized samples were ...

The photocatalytic activity of the semiconductor oxide Bi₂MoO₆ by visible light in the degradation of Rhodamine B in aqueous solution was evaluated in this research. The Bi₂MoO₆ was synthesized by solid state in the two crystaline forms...