127 research outputs found
Enhanced photocatalytic degradation of acetaminophen from wastewater using WO3/TiO2/SiO2 composite under UV–VIS irradiation
peer-reviewedThe full text of this article will not be available in ULIR until the embargo expires on the 26/8/2019This study investigates the photocatalytic degradation of acetaminophen (Ace) from synthetic
wastewater by individual TiO2, TiO2/SiO2 and/or WO3/TiO2/SiO2 composite under UV-VIS
illumination. To characterize changes in their morphology and crystal structures before and after
treatment, Χ-ray diffraction (ΧRD), Fourier transform infrared spectroscopy (FTIR) , DRS
UV-VIS absorption spectra, Brunaer-Emmer-Teller (BET) and scanning electron microscopy
(SEM) techniques were used. The effects of varying loading ratios of the WO3 on the TiO2/SiO2
composite for Ace degradation were studied. Operating parameters such as initial concentration,
reaction time, dose of photocatalyst and pH were tested. Degradation by-products were also
presented. It is found that the photodegradation performance of the WO3/TiO2/SiO2 composite as
a photocatalyst in this study could be enhanced by optimizing the loading ratio of the WO3.
About 3% (w/w) of WO3/TiO2/SiO2 was found to improve the degradation of Ace from 33% to
95% at the same initial concentration of 5 mg/L. The resulting oxidation by-products included
hydroquinone and 1,4-benzoquinone. Under the same conditions, the result of photocatalytic
degradation by the 3% (w/w) of WO3/TiO2/SiO2 composite was significantly higher (95%) than
that by the individual TiO2/SiO2 (42%) and/or by the TiO2 alone (33%). Under optimized
conditions (1.5 g/L; 3% (w/w) of WO3/TiO2/SiO2 composite; pH 9; 4 h of reaction time), 95% of
Ace removal with an initial concentration of 5 mg/L could be attained. However, the treated
effluents still could not meet the discharge standard of less than 0.2 mg/L set by China’s and US
legislation. This indicates that further subsequent treatment like biological processes is still
necessary for completing the removal of target pollutant from the wastewater samples
The relationship between local structure and photo-Fenton catalytic ability of glasses and glass-ceramics prepared from Japanese slag
Local structure and the photo-Fenton reactivity of iron-containing glasses and glass-ceramics prepared from Japanese domestic waste slag were investigated. The largest rate constant (k) of (2.8 ± 0.08) × 10−2 min−1 was recorded for the methylene blue degradation test by using H2O2 with a heat-treated ‘model slag’. The 57Fe Mössbauer spectrum was composed of a paramagnetic doublet with isomer shift of 0.18 ± 0.01 mm s−1 attributed to distorted FeIIIO4 tetrahedra. These results indicate that the paramagnetic Fe3+ provided strong photo-Fenton catalytic ability, and that waste slag can thus be recycled as an effective visible-light activated photocatalyst
Porous nanoplate-like tungsten trioxide/reduced graphene oxide catalyst for sonocatalytic degradation and photocatalytic hydrogen production
A highly efficient visible-light responsive sprayed WO3/FTO photoanode for photoelectrocatalytic degradation of brilliant blue
Photocatalytic hydrogen production using TiO2 nanogranules prepared by hydrothermal route
Enhanced photocatalytic performance of ultrasound treated GO/TiO2 composite for photocatalytic degradation of salicylic acid under sunlight illumination
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