The K2Ti4O9 whiskers were chosen for the catalyst carrier, TiO2/potassium titanate photocatalyst was prepared by Sol-gel method. The product was characterated by X-ray diffraction and SEM. EDS shows that, the main pec...The K2Ti4O9 whiskers were chosen for the catalyst carrier, TiO2/potassium titanate photocatalyst was prepared by Sol-gel method. The product was characterated by X-ray diffraction and SEM. EDS shows that, the main peck included Ti, O, and K in potassium titanate whisker. The main peak of K disappeared and the peaks of Ti, O stayed after whisker was covered. It directed that the surface of sample was covered by TiO2. XRD shows that diffraction peak appeared, which was corresponded to the peak of anatase TiO2. In the reaction device of photochemistry, using middle-pressure mercury lamp as illumination, rhodamine B as simulant pollutant, the photocatalytic performance of TiO2/potassium titanate was studied. Under the same conditions, the lower pH, the larger illuminance, the higher temperature, the greater aeration quantum and the lower initial concentration of rhodamine B, the higher decoloration rate was got. Under our experiment conditions: pH 6, the illuminance of 250W, the temperature of 313K, and the aeration quantum of 2.0L/min. When the concentration of rhodamine B was 8mg/L The photocatalyst of TiO2/potassium titanate was 0.01g/L. The decoloration rate of TiO2/potassium titanate dealt with the rhodamine B reach over 95% in 160min, and compare with TiO2, the decoloration rate of rhodamine B was improved 0.50~1.91 multiple. TiO2/potassium titanate can be used to treatment of dye wastewater.展开更多
Non-biodegradable and toxic photocatalysts pose as secondary threats to the environmental security.In this work,non-toxic biocomposites were prepared using natural bamboo cellulose fibers(CF),polyvinyl alcohols(PVAs),...Non-biodegradable and toxic photocatalysts pose as secondary threats to the environmental security.In this work,non-toxic biocomposites were prepared using natural bamboo cellulose fibers(CF),polyvinyl alcohols(PVAs),BiVO_(4),and carbon dots(CDs)from biomaterials.Thereafter,their optical properties,chemical characterizations,and photocatalytic performances were evaluated.The novel BiVO_(4)(-)CF@CDs(-)PVA composites were prepared via the combined implementation of in situ and impregnation methods.The optical properties revealed that the CDs and fibers increased the range and intensity of light absorption.The PVAs were used as the shield and dispersant to enhance stability because they have numerous chemical groups.In view of the various possible paths of electron migration,the enhanced photocatalytic activity of BiVO_(4)(-)CF@CDs(-)PVA composites for tetracycline degradation was observed under visible light illumination.The origins of the structure,morphology,and optical mechanism in the enhancement of the photocatalytic ability of BiVO_(4)(-)CF@CDs(-)PVA composites were discussed and demonstrated.展开更多
基金The Innovation Foundation of the Ministry of Science and Technology of China (No. 03C26213200932)the Natural Science Foundation of Henan Province (No.0624720029).
文摘The K2Ti4O9 whiskers were chosen for the catalyst carrier, TiO2/potassium titanate photocatalyst was prepared by Sol-gel method. The product was characterated by X-ray diffraction and SEM. EDS shows that, the main peck included Ti, O, and K in potassium titanate whisker. The main peak of K disappeared and the peaks of Ti, O stayed after whisker was covered. It directed that the surface of sample was covered by TiO2. XRD shows that diffraction peak appeared, which was corresponded to the peak of anatase TiO2. In the reaction device of photochemistry, using middle-pressure mercury lamp as illumination, rhodamine B as simulant pollutant, the photocatalytic performance of TiO2/potassium titanate was studied. Under the same conditions, the lower pH, the larger illuminance, the higher temperature, the greater aeration quantum and the lower initial concentration of rhodamine B, the higher decoloration rate was got. Under our experiment conditions: pH 6, the illuminance of 250W, the temperature of 313K, and the aeration quantum of 2.0L/min. When the concentration of rhodamine B was 8mg/L The photocatalyst of TiO2/potassium titanate was 0.01g/L. The decoloration rate of TiO2/potassium titanate dealt with the rhodamine B reach over 95% in 160min, and compare with TiO2, the decoloration rate of rhodamine B was improved 0.50~1.91 multiple. TiO2/potassium titanate can be used to treatment of dye wastewater.
基金the National Natural Science Foundation of China(Grant No.21908080)Natural Science Foundation of Jiangsu Province(Grant No.Bk20180884)。
文摘Non-biodegradable and toxic photocatalysts pose as secondary threats to the environmental security.In this work,non-toxic biocomposites were prepared using natural bamboo cellulose fibers(CF),polyvinyl alcohols(PVAs),BiVO_(4),and carbon dots(CDs)from biomaterials.Thereafter,their optical properties,chemical characterizations,and photocatalytic performances were evaluated.The novel BiVO_(4)(-)CF@CDs(-)PVA composites were prepared via the combined implementation of in situ and impregnation methods.The optical properties revealed that the CDs and fibers increased the range and intensity of light absorption.The PVAs were used as the shield and dispersant to enhance stability because they have numerous chemical groups.In view of the various possible paths of electron migration,the enhanced photocatalytic activity of BiVO_(4)(-)CF@CDs(-)PVA composites for tetracycline degradation was observed under visible light illumination.The origins of the structure,morphology,and optical mechanism in the enhancement of the photocatalytic ability of BiVO_(4)(-)CF@CDs(-)PVA composites were discussed and demonstrated.
