Photocatalytic reduction of hexavalent chromium in wastewater has been widely investigated as an attractive treatment method. In this work, we reported an efficient method for photocatalytic reduction of Cr（VI） over...Photocatalytic reduction of hexavalent chromium in wastewater has been widely investigated as an attractive treatment method. In this work, we reported an efficient method for photocatalytic reduction of Cr（VI） over transparent polyvinyl alcohol/titanium dioxide （PVA/TiO2） nanocomposite films under sunlight irradiation. The trans- parent PVA/TiO2 nanocomposite films were prepared by a simple hydrothermal method combined with a solution casting process. The results revealed that the anatase TiO2 nanoparticles with size less than 10 nm were in-situ generated in PVA matrix, which endowed the films with high trans- parency. Photocatalytic reduction of Cr（VI） over PVA/TiO2 nanocomposite films exhibited superior visible light pho- tocatalytic activity. Mechanism investigation demonstrated that the PVA acted not only as a transparent support for TiO2 nanoparticles, but also as holes scavengers simultaneously to improve the separation of photogenerated holes and elec- trons. Meanwhile, the transparent PVA/TiO2 nanocomposite films displayed remarkable stability and excellent recyclabil- ity during multicycle Cr（VI） photoreduction. Furthermore, the PVA/TiO2 nanocomposite films showed selective adsorp- tion ability for Cr（III）, and thus totally removal of Cr（VI） was achieved after photoreduction process.展开更多
Porous organic polymers(POPs)are an emerging class of porous materials,having many promising applications in a variety of areas.Among them,covalent triazine frameworks(CTFs)featuring conjugated and porous structures c...Porous organic polymers(POPs)are an emerging class of porous materials,having many promising applications in a variety of areas.Among them,covalent triazine frameworks(CTFs)featuring conjugated and porous structures can be well applied in optoelectronics.To achieve high optoelectronic performance,usually the design and synthesis of CTFs based on appropriate building blocks is critical.Here we report the synthesis of two fluorescent CTFs based on typical fluorescent building blocks,in which CTF-Py constructed from a pyrene(Py)building block was reported for the first time,showing prospective applications in the sensing of nitroaromatics with high sensitivity,and photocatalytic water splitting and carbon dioxide reduction with high performance in comparison with other porous organic materials.展开更多
基金supported by the Joint Program of Beijing Natural Science Foundation and Beijing Academy of Science and Technology (L140005)the National Natural Science Foundation of China (51203094)
文摘Photocatalytic reduction of hexavalent chromium in wastewater has been widely investigated as an attractive treatment method. In this work, we reported an efficient method for photocatalytic reduction of Cr（VI） over transparent polyvinyl alcohol/titanium dioxide （PVA/TiO2） nanocomposite films under sunlight irradiation. The trans- parent PVA/TiO2 nanocomposite films were prepared by a simple hydrothermal method combined with a solution casting process. The results revealed that the anatase TiO2 nanoparticles with size less than 10 nm were in-situ generated in PVA matrix, which endowed the films with high trans- parency. Photocatalytic reduction of Cr（VI） over PVA/TiO2 nanocomposite films exhibited superior visible light pho- tocatalytic activity. Mechanism investigation demonstrated that the PVA acted not only as a transparent support for TiO2 nanoparticles, but also as holes scavengers simultaneously to improve the separation of photogenerated holes and elec- trons. Meanwhile, the transparent PVA/TiO2 nanocomposite films displayed remarkable stability and excellent recyclabil- ity during multicycle Cr（VI） photoreduction. Furthermore, the PVA/TiO2 nanocomposite films showed selective adsorp- tion ability for Cr（III）, and thus totally removal of Cr（VI） was achieved after photoreduction process.
基金supported by the National Natural Science Foundation of China(21875078 and 21975146)。
文摘Porous organic polymers(POPs)are an emerging class of porous materials,having many promising applications in a variety of areas.Among them,covalent triazine frameworks(CTFs)featuring conjugated and porous structures can be well applied in optoelectronics.To achieve high optoelectronic performance,usually the design and synthesis of CTFs based on appropriate building blocks is critical.Here we report the synthesis of two fluorescent CTFs based on typical fluorescent building blocks,in which CTF-Py constructed from a pyrene(Py)building block was reported for the first time,showing prospective applications in the sensing of nitroaromatics with high sensitivity,and photocatalytic water splitting and carbon dioxide reduction with high performance in comparison with other porous organic materials.
