1．Large-surface mesoporous TiO2 nanoparticles: Synthesis, growth
and photocatalytic performance
UV light source was provided by a mercury lamp (TQ150, 300W with characteristic wavelength at 365 nm). In a typical procedure, 20 mg TiO2 powders were added into 100 ml dye solution with a concentration of 30 mg/ L. Then, the suspension was stirred in dark for 30 min before UV irradiation. Samples were collected at a 5 min interval for UV/Vis adsorption spectra, conducted by Varian Cary 5 UV–VIS–NIR. Commercial TiO2 (P25) powder was used for comparison in this work.
2. Mesoporous Fe2O3-doped TiO2 nanostructured fibers with higher
photocatalytic activity
The photocatalytic activity of the mesoporous Fe2O3-doped TiO2 fibers was investigated by cleaning methylene blue (MB) in water under UV irradiation. In a typical process, 1.0 mg of the catalysts was added into 100.0 mL MB solution with a concentration of 10 mg/L, and the solution was irradiated by a 300W high pressure mercury lamp (k = 365 nm, Shanghai Yaming Co., China) while stirring.At given irradiation time intervals, the maximum absorbance of MB solution (max = 664 nm) was monitored by using a UV-vis spectrophotometer
3. A high activity photocatalyst of hierarchical 3D flowerlike ZnO microspheres: Synthesis, characterization and catalytic activity
The photocatalytic activity of sample was evaluated for a degradation of Rhodamin B (Rh B, 99%) by UV light irradiation from a 300W high-pressure mercury lamp (the irradiation wavelength is mainly 365 nm). In a typical photocatalytic experiment, 10 mg ZnO photocatalyst was added into a 100 mL quartz photoreactor containing 40 mL aqueous solution of Rh B (2 mg /L). The mixture was sonicated for 30 min in the dark in order to reach the adsorption equilibrium of dye and then irradiated for different times at room temperature under magnetic stirring.
4. Facile synthesis of Bi2S3 hierarchical nanostructure with enhanced
photocatalytic activity
Photocatalytic activities of the samples were measured by the degradation of methyl orange (MO) under UV irradiation using a 300W mercury lamp. Typically, 10 mg of photocatalysts was added into 20 mL of 10 mg/L MO aqueous solution. The suspension was continuously stirred for 1 h in the dark to ensure the adsorption–desorption equilibrium between the photocatalyst and the MO. The solution was then shined under UV irradiation. At a given irradiation time, 5 mL of the suspension was collected and centrifuged to remove the photocatalyst then analyzed by recording the UV-vis spectra of MO at the maximum absorption wavelength. All the experiments were conducted at room temperature.
5. Vacancy Associates Promoting Solar-Driven Photocatalytic
Activity of Ultrathin Bismuth Oxychloride Nanosheets Photocatalytic Measurement.
Photocatalytic activities of the as prepared products were evaluated by examining the photodegradation of Rhodamine B (RhB) under simulated solar irradiation from a 150W Xe lamp (PLS-SXE300/300UV, Trusttech Co., Ltd. Beijing). For comparison, the UV and visible light photocatalytic activities were also evaluated with a 150 W high-pressure mercury lamp (λ = 365 nm) or a 150 W Xe lamp with a 420 nm cutoff filter as the UV or visible light source, respectively. Typically, 5 mg of catalyst was added into 100 mL of 10?5 M RhB aqueous solution. Before illumination, the suspension was placed in the dark under constant stirring for 120 min to reach adsorption/desorption equilibrium. Five milliliters of the suspension was withdrawn every 5 min under irradiation and centrifuged to remove the photocatalyst for UV?vis absorption spectrum measurements. The concentration of RhB was determined by monitoring its characteristic absorption at 554 nm.
6. Enhanced photocatalytic activity of Fe2O3 decorated Bi2O3
Evaluation of the photocatalytic activity
All photocatalytic decolorization experiments were performed in a SGY-II photochemical reactor (Kai Feng HXSCI Science Instrument Factory, China). The irradiation source was a 500 W high-pressure mercury lamp with a maximum emitting radiation of 365 nm and 350 W Xe lamp (simulated solar light), respectively; the lamps were encapsulated in a cooling quartz jacket and positioned in the middle of the reactor. Quartz test tubes were located around the lamp and the distance from the lamp to the quartz test tubes was 10 cm. The initial concentration of MO solution was 10 mg/L. 50 mg of the prepared photocatalyst was added into 50 mL MO solution and the reaction mixture was continuously aerated by a pump to provide oxygen and aid in the mixing of the reaction solution. The decolorization reaction was performed at room temperature. The pH value of the reaction solution was 7.0. After regular intervals, the samples were removed and centrifuged (6000 rpm) to separate the photocatalyst for analysis. The concentration of MO was measured by a 756 PC spectrophotometer at 460 nm and analyzed by Lambert–Beer law. All reported data were the average values of three parallel determinations.
7. Hydrothermal fabrication of porous MoS2 and its visible light
photocatalytic properties
Photocatalytic studies: The photocatalytic performance of the prepared porous MoS2 was evaluated by the degradation of methylene blue (MB). An amount of 20 mg of the prepared porous MoS2 was dispersed in 100 mL of MB aqueous solution (10 mg/L). The above mixture was stirred for 30 min in the dark to establish MB adsorption equilibrium on the porous MoS2. Similar to previous reports [12], 0.1 mL H2O2 (30% aqueous solution) was added to the solution to serve as an electron scavenger. The photocatalytic process was performed in a glass reactor irradiated by a 100 W xenon light source (Shanghai Yaming-lighting Ltd.). The experiments were performed for 150 min, and the MB solution samples were taken every 30 min. The
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