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The global energy crisis and water pollution drive the researchers to develop highly effective and less energy intensive water purification technologies. In this study, a highly active WO@TiO-SiO nanocomposite was synthesized and used for photocatalytic degradation of persistent organic pollutants under simulated solar light. The optimum WO@TiO-SiO prepared with 2 wt% WO loading and calcination at 800 °C exhibited higher photocatalytic activity, as the rate constant (k) for phenanthrene degradation was ∼7.1 times of that for the commercial TiO (P25). The extremely large specific surface area (>400 m/g) of WO@TiO-SiO afforded it with enlarged pollutants adsorption performance and abundant active surface sites. The heterojunction of anatase with SiO as well as loading of WO decreased the band gap energy (E) of TiO, which extended the utilization spectrum of TiO to visible region. Formation of Ti-O-Si band indicated the excess charges can cause Brønsted acidity due to the absorption of protons to compensate the charges. Moreover, the migration of photo-excited electrons from the conduction band of anatase to WO and holes in the opposite direction restrained the electron-hole recombination. The photocatalytic degradation mechanism and pathway for phenanthrene degradation were proposed based on experimental analysis and density functional theory (DFT) calculation, and the toxicities of the degradation intermediates were evaluated by quantitative structure-activity relationship (QSAR) analysis. WO@TiO-SiO also showed good separation (settling) performance and high stability. Our work is expected to offer new insight into the photocatalytic mechanism for WO, TiO and SiO based heterojunctions, and rational design and synthesis of highly efficient photocatalysts for environmental application.
This article was published in the following journal.
Name: Water research
Graphene modified anatase/titanate nanosheets (G/A/TNS) synthesized through hydrothermal treatment were used for solar-light-driven photocatalytic degradation of a typical pharmaceutically active comp...
Improvement of light harvesting and reaction kinetics is of great importance for achieving efficient solar-driven CO2 reduction. Here, a Ni modified low-crystalline Ni-Ge containing hydroxide with Lew...
Hydrogen production from coal gasification provides a cleaning approach to convert coal resource into chemical energy, but the key procedures of coal gasification and thermal catalytic water-gas shift...
Catalytic C1 chemistry based on the activation/conversion of synthesis gas (CO + H2), methane, carbon dioxide and methanol offers great potential for the sustainable development of hydrocarbon fuels t...
Developing hierarchical TiO2 superstructures with novel morphologies and intriguing photoelectric properties for utilizing solar energy is known to be an effective approach to alleviate the serious pr...
The investigators will conduct a stepped wedge cluster-randomized controlled trial in maternity care facilities in Uganda to evaluate the impact of the provision of a reliable light source...
This is a pilot study designed to evaluate the cutaneous effect of systemic inhibition of the tyrosine kinase pathway in the presence or absence of solar simulated light exposure. A maxim...
Evaluation of the pharmacokinetics for [14C]-benzo[a]pyrene ([14C]-BaP) and metabolites in plasma and urine over 48 hours following a 50 ng dose (5.4 nCi) alone or with 1250 ng phenanthren...
The purpose of this research study is to better understand how people respond to cancer-causing chemicals in cigarette smoke. Some people are able to get rid of these chemicals as harmles...
Melasma is a fairly common condition resulting in hyperpigmented macules on the face. Melasma is difficult to treat and has a significant negative impact on the patient's quality of life. ...
Lasers with a semiconductor diode as the active medium. Diode lasers transform electric energy to light using the same principle as a light-emitting diode (LED), but with internal reflection capability, thus forming a resonator where a stimulated light can reflect back and forth, allowing only a certain wavelength to be emitted. The emission of a given device is determined by the active compound used (e.g., gallium arsenide crystals doped with aluminum or indium). Typical wavelengths are 810, 1,060 and 1,300 nm. (From UMDNS, 2005)
Light driven chloride ion pumps that are ubiquitously found in halophilic archaea (HALOBACTERIALES).
Proton-translocating ATPases which produce ADENOSINE TRIPHOSPHATE in plants. They derive energy from light-driven reactions that develop high concentrations of protons within the membranous cisternae (THYLAKOIDS) of the CHLOROPLASTS.
Ozone in the Earth's stratosphere. It is produced continuously by the action of solar ULTRAVIOLET RAYS on oxygen in the stratosphere. The stratospheric ozone (especially at the ozone layer) blocks much of the solar UV radiation of wavelengths of 320 nanometers or less from being transmitted to lower ATMOSPHERE of the Earth.
Treatment using irradiation with light of low power intensity so that the effects are a response to the light and not due to heat. A variety of light sources, especially low-power lasers are used.