Abstract
Mesoporous Al-MCM-41@Ag/TiO2 nanocomposites were synthesized successfully by combining the sol-gel method and hydrothermal treatment, using titanium isopropoxide (TTIP), AgNO3, and Vietnamese bentonite as precursors of Ti, Ag, and Si, respectively. The synthesized materials were well characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption isotherm measurements, energy dispersive X-ray spectroscopy (EDX), UV-visible diffuse reflectance spectroscopy (UV-Vis/DRS), and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity was evaluated by the photodegradation of dibenzothiophene (DBT) under both UV and visible light irradiation. MCM-41@Ag/TiO2 catalyst exhibited high catalytic activity for the oxidative desulfurization (ODS) of DBT reaching almost 100% conversions at 50°C after 2 h under UV and visible light irradiations. The significant enhanced degradation of DBT over Al-MCM-41@Ag/TiO2 might be due to the synergy effects of high surface area of MCM-41, well-distributed TiO2 anatase, and reduced electron-hole recombination rates due to the dispersion of Ag nanoparticles.
Highlights
Dibenzothiophene presenting in diesel is one of the main sulfur-containing organic pollutants in fuel oils and is difficult to be removed [1]. is organic pollutant is difficult to be reduced using the conventional hydrodesulfurization (HDS) due to its steric hindrance [2, 3]
The use of metalTiO2 powders in the treatment of aqueous organic pollutants has some drawbacks such as difficult recovery and poor adsorption capacity due to its low surface area and agglomeration Journal of Chemistry in suspension [13]. erefore, noble metal nanoparticles doping on titania with improved crystallinity, surface area, and surface properties to achieve higher adsorption capacity and photocatalytic activity [14] have been studied extensively such as metal-titania nanoparticles coated on the high surface area supports and thermally stable core materials [15, 16]
In a typical Al-MCM-41 synthesis, 1.2 g CTAB was added to 20 mL distilled water. en, 42 mL of the supernatant was added to the above solution and stirred at room temperature for 6 h at pH of about 9-10, which was adjusted
Summary
Dibenzothiophene presenting in diesel is one of the main sulfur-containing organic pollutants in fuel oils and is difficult to be removed [1]. is organic pollutant is difficult to be reduced using the conventional hydrodesulfurization (HDS) due to its steric hindrance [2, 3]. Erefore, noble metal nanoparticles doping on titania with improved crystallinity, surface area, and surface properties to achieve higher adsorption capacity and photocatalytic activity [14] have been studied extensively such as metal-titania nanoparticles coated on the high surface area supports and thermally stable core materials [15, 16]. Nanoporous materials such as ordered mesoporous silica [17,18,19], activated carbon [20, 21], microporous zeolites [22, 23], and metal organic frameworks [24, 25] have been widely used as TiO2 carriers due to their versatile structures and high porosity to achieve more active sites per unit area, a higher photocatalytic reaction rate. F127 was removed by calcining the obtained solid at 450°C in air for 5 h
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