Among the substantial amount of photocatalyst materials,TiO2 has been enthusiastically studied for a few decades due to its outstanding photocatalytic activity and stability.Recently,black TiO2 consisting of approxima...Among the substantial amount of photocatalyst materials,TiO2 has been enthusiastically studied for a few decades due to its outstanding photocatalytic activity and stability.Recently,black TiO2 consisting of approximately 2 nm of thin disorder layer around the surface showed surprisingly high solar hydrogen generation ability.The disorder layer of TiO2 can enhance its light absorption,charge separation,and surface reaction abilities,however exact fundamentals of photocatalytic water-splitting pathways are still ambiguous.Herein,recent progress and investigations on exact functions of disorder layer and its application in photocatalytic CO2 reduction will be discussed.Throughout the comprehensive studies on disorder layer of TiO2,disorder engineering on photocatalyst materials will suggest the further extension of developing solarfuel production technologies.展开更多
An efficient toluene removal in air using a plasma photocatalytic system（PPS） not only needs favorable surface reactions over photocatalysts under the action of plasma,but also requires the photocatalysts to efficie...An efficient toluene removal in air using a plasma photocatalytic system（PPS） not only needs favorable surface reactions over photocatalysts under the action of plasma,but also requires the photocatalysts to efficiently absorb light emitted from the discharge for driving the photocatalytic reactions. We report here that the PPS constructed by integrating a black titania（B-TiO2）photocatalyst with a dielectric barrier discharge（DBD） can effectively remove toluene with above 70% CO2 selectivity and remarkably reduced the concentration of secondary pollutants of ozone and nitrogen oxides at a specific energy input of 1500 J·l-1,while exhibiting good stability. Photocatalyst characterizations suggest that the B-TiO2 provides a high concentration of oxygen vacancies for the surface oxidation of toluene in DBD,and efficiently absorbs ultraviolet–visible light emitted from the discharge to induce plasma photocatalytic oxidation of toluene. The presence of B-TiO2 in the plasma region also results in a high discharge efficiency,facilitating the generation of large numbers of reactive species and thus the oxidation of toluene towards CO2. The greatly enhanced performance of the PPS integrated with B-TiO2 in toluene removal offers a promising approach to efficiently remove refractory volatile organic compounds from air at low temperatures.展开更多
Photocatalytic discoloration kinetics of Reactive Black 5 (RB5), a vinylsulfone dye, has been studied spectrophotometrically by following the decrease in dye concentration with time at ambient conditions using a flow ...Photocatalytic discoloration kinetics of Reactive Black 5 (RB5), a vinylsulfone dye, has been studied spectrophotometrically by following the decrease in dye concentration with time at ambient conditions using a flow loop reactor. UV lump, Black Light Blue (BLB) emitting at maximum wavelength of 365 nm and Ahlstrom Research Service paper consistent of TiO2 P500 coated on non woven paper was used respectively as source of UV light and photocatalyst. At natural pH, the result shows that photolysis of RB5 and its adsorption in the presence of photocatalyst was negligible while the photocatalytic oxidation (PCO) permits 30.8% of RB5 degradation. The degradation of dye was studied under a variety of conditions such as volumetric flow rate, initial pH, photocatalyst reuse, and in the presence of electron acceptor such as sodium persulphate ((Na)2S2O8). The degradation rates were found to be strongly influenced by all the above parameters. The circulation flow rate of 108 L/h was the best. The rate constant calculated when the initial pH was varied shows that pH 3 was more favorable for RB5 removal. Peroxydisulphate ions have the strong effect on RB5 discoloration even in dark without and with photocatalyst. When UV light was used in the presence of photocatalyst, 50 min was enough for quasi-total removal of RB5 with (0.2 M).展开更多
基金Sungsoon Kim and Yoonjun Cho contributed equally to this study.This study was supported by the National Research Foundation of Korea(2015M1A2A2074663,NRF-2019M1A2A2065612,and 2019R1A4A1029237)This study was also supported by the Korea Institute of Energy Technology Evaluation and Planning and the Ministry of Trade,Industry&Energy of the Republic of Korea(No.20163010012450).
文摘Among the substantial amount of photocatalyst materials,TiO2 has been enthusiastically studied for a few decades due to its outstanding photocatalytic activity and stability.Recently,black TiO2 consisting of approximately 2 nm of thin disorder layer around the surface showed surprisingly high solar hydrogen generation ability.The disorder layer of TiO2 can enhance its light absorption,charge separation,and surface reaction abilities,however exact fundamentals of photocatalytic water-splitting pathways are still ambiguous.Herein,recent progress and investigations on exact functions of disorder layer and its application in photocatalytic CO2 reduction will be discussed.Throughout the comprehensive studies on disorder layer of TiO2,disorder engineering on photocatalyst materials will suggest the further extension of developing solarfuel production technologies.
基金supported by National Natural Science Foundation of China (No. 21808024)Fundamental Research Funds for the Central Universities (DMU 3132018175)
文摘An efficient toluene removal in air using a plasma photocatalytic system（PPS） not only needs favorable surface reactions over photocatalysts under the action of plasma,but also requires the photocatalysts to efficiently absorb light emitted from the discharge for driving the photocatalytic reactions. We report here that the PPS constructed by integrating a black titania（B-TiO2）photocatalyst with a dielectric barrier discharge（DBD） can effectively remove toluene with above 70% CO2 selectivity and remarkably reduced the concentration of secondary pollutants of ozone and nitrogen oxides at a specific energy input of 1500 J·l-1,while exhibiting good stability. Photocatalyst characterizations suggest that the B-TiO2 provides a high concentration of oxygen vacancies for the surface oxidation of toluene in DBD,and efficiently absorbs ultraviolet–visible light emitted from the discharge to induce plasma photocatalytic oxidation of toluene. The presence of B-TiO2 in the plasma region also results in a high discharge efficiency,facilitating the generation of large numbers of reactive species and thus the oxidation of toluene towards CO2. The greatly enhanced performance of the PPS integrated with B-TiO2 in toluene removal offers a promising approach to efficiently remove refractory volatile organic compounds from air at low temperatures.
文摘Photocatalytic discoloration kinetics of Reactive Black 5 (RB5), a vinylsulfone dye, has been studied spectrophotometrically by following the decrease in dye concentration with time at ambient conditions using a flow loop reactor. UV lump, Black Light Blue (BLB) emitting at maximum wavelength of 365 nm and Ahlstrom Research Service paper consistent of TiO2 P500 coated on non woven paper was used respectively as source of UV light and photocatalyst. At natural pH, the result shows that photolysis of RB5 and its adsorption in the presence of photocatalyst was negligible while the photocatalytic oxidation (PCO) permits 30.8% of RB5 degradation. The degradation of dye was studied under a variety of conditions such as volumetric flow rate, initial pH, photocatalyst reuse, and in the presence of electron acceptor such as sodium persulphate ((Na)2S2O8). The degradation rates were found to be strongly influenced by all the above parameters. The circulation flow rate of 108 L/h was the best. The rate constant calculated when the initial pH was varied shows that pH 3 was more favorable for RB5 removal. Peroxydisulphate ions have the strong effect on RB5 discoloration even in dark without and with photocatalyst. When UV light was used in the presence of photocatalyst, 50 min was enough for quasi-total removal of RB5 with (0.2 M).
