The highly desired goal is to employ visible light for the photocatalytic reduction of toxic Cr(Ⅵ)to environmentally friendly Cr(Ⅲ).Metal-organic frameworks(MOFs)are considered one of the most promising materials fo...The highly desired goal is to employ visible light for the photocatalytic reduction of toxic Cr(Ⅵ)to environmentally friendly Cr(Ⅲ).Metal-organic frameworks(MOFs)are considered one of the most promising materials for the photoreduction of Cr(Ⅵ).Nevertheless,developing MOFs with high stability and activity is still challenging.Herein,we report a stable Zn-based MOF(named DZU-64)with an anthracene functionalized ligand,and its reduction of Cr(Ⅵ)under sunlight irradiation was investigated.DZU-64 exhibits excellent chemical stability in pH range of 2-14 aqueous solution,and remarkable thermal stability to570℃.For the photoreduction of Cr(Ⅵ)under visible light irradiation,DZU-64 gives a record rate constant of 0.467 min^(-1)and a high Cr(Ⅵ)reduction rate of 6.68 mg Cr_((Ⅵ))g^(-1)_(cata)min^(-1)at p H 2.Moreover,under real solar light,DZU-64 can also efficiently reduce Cr(Ⅵ)to Cr(Ⅲ)while retaining its catalytic activity throughout 5 cycles without any notable decline,further demonstrating its great application prospect.By combining the photovoltaic performance tests and electron spin resonance test,the possible photoreduction of Cr(Ⅵ)mechanism in DZU-64 was analyzed.展开更多
Sensors capable of recognizing cell surface carbohydrates,such as sialyl Lewis X（sLe-x）,are invaluable research tools and for the diagnosis and early detection of many forms of cancer.In this paper,we report the des...Sensors capable of recognizing cell surface carbohydrates,such as sialyl Lewis X（sLe-x）,are invaluable research tools and for the diagnosis and early detection of many forms of cancer.In this paper,we report the design and synthesis of a series of bisboronic acids 6（a-f） as fluorescent sensors towards mono-/oligosaccharides.Among them,compounds 6d and 6e showed strong binding affinities with glucose and fructose,while compound 6c,in which two anthracene-based boronic acid units were linked by a hexamethylene spacer,was able to recognize sLe-x selectivity and stained HEPG2 cells at 1 μmoI/L.展开更多
基金supported by the National Natural Science Foundation of China(Nos.21601028 and 21902022)the Natural Science Foundation of Shandong Province(Nos.ZR2022QB058,ZR2018LB018 and ZR2019QB026)+1 种基金Qingchuang Science and Technology Plan of Shandong Province(No.2021KJ054)the Scientific Research Foundation of Dezhou University(Nos.HXKT2022309,HXKT2022344 and HXKT2022182)。
文摘The highly desired goal is to employ visible light for the photocatalytic reduction of toxic Cr(Ⅵ)to environmentally friendly Cr(Ⅲ).Metal-organic frameworks(MOFs)are considered one of the most promising materials for the photoreduction of Cr(Ⅵ).Nevertheless,developing MOFs with high stability and activity is still challenging.Herein,we report a stable Zn-based MOF(named DZU-64)with an anthracene functionalized ligand,and its reduction of Cr(Ⅵ)under sunlight irradiation was investigated.DZU-64 exhibits excellent chemical stability in pH range of 2-14 aqueous solution,and remarkable thermal stability to570℃.For the photoreduction of Cr(Ⅵ)under visible light irradiation,DZU-64 gives a record rate constant of 0.467 min^(-1)and a high Cr(Ⅵ)reduction rate of 6.68 mg Cr_((Ⅵ))g^(-1)_(cata)min^(-1)at p H 2.Moreover,under real solar light,DZU-64 can also efficiently reduce Cr(Ⅵ)to Cr(Ⅲ)while retaining its catalytic activity throughout 5 cycles without any notable decline,further demonstrating its great application prospect.By combining the photovoltaic performance tests and electron spin resonance test,the possible photoreduction of Cr(Ⅵ)mechanism in DZU-64 was analyzed.
基金supported by the National Natural Science Foundation of China(NSFC)(No.21372060)Hebei Province Natural Science Fund for Distinguished Young Scholars(No.B2015201005)
文摘Sensors capable of recognizing cell surface carbohydrates,such as sialyl Lewis X（sLe-x）,are invaluable research tools and for the diagnosis and early detection of many forms of cancer.In this paper,we report the design and synthesis of a series of bisboronic acids 6（a-f） as fluorescent sensors towards mono-/oligosaccharides.Among them,compounds 6d and 6e showed strong binding affinities with glucose and fructose,while compound 6c,in which two anthracene-based boronic acid units were linked by a hexamethylene spacer,was able to recognize sLe-x selectivity and stained HEPG2 cells at 1 μmoI/L.
