共价有机框架(COFs)在电催化析氧反应(OER)中的应用得到了广泛的关注。然而,大多数无金属共价有机框架(COFs)的导电性较差,不利于OER反应。四硫富瓦烯(TTF)是一种良好的电子供体,具有快速的电子转移能力,将TTF整合到共价有机框架骨架中...共价有机框架(COFs)在电催化析氧反应(OER)中的应用得到了广泛的关注。然而,大多数无金属共价有机框架(COFs)的导电性较差,不利于OER反应。四硫富瓦烯(TTF)是一种良好的电子供体,具有快速的电子转移能力,将TTF整合到共价有机框架骨架中将有助于电子的转移。在此,我们报道了一种基于四硫富瓦烯的二维无金属共价有机框架材料,JUC-630。与不含四硫富瓦烯的同类材料(Etta-TdCOF)相比,JUC-630具有较低的过电位(400m V)和塔菲尔斜率(104 m V·dec^(-1))。本研究提出了合理设计功能基元的策略,这有助于大大提高COF材料的OER催化活性。展开更多
This paper mainly elaborated the recent developments of the studies on the new type zeohite molecular sieve host-nanoguest composite materials composing of molecular sieve chaimels or cages encapsulated nanoscale mate...This paper mainly elaborated the recent developments of the studies on the new type zeohite molecular sieve host-nanoguest composite materials composing of molecular sieve chaimels or cages encapsulated nanoscale materials from the point of nanochemistry and material science,and the trends of development in this field. As the research of the properties of this kind of materials are gomg on. it is possible that this kind of host-guest nanocomposite materials will be usd in some fields. such as science and high technology fields. as the new type of ptical. electrical and magnetic materials in the level of molecular assembly. This paper contains the following contents:hosts and guests; the sizes and shapes of guests; the optical, electrical and magnetic properties of the materials; the syntheses and characterizations of the materials; the applications of the materials and forecast.展开更多
The hexagonal silica mesoporous material SBA-15 with ordered 2-dimensional channel structure was used as a suppport to the immobilization of emzyme. α-Chymotrypsin, an enzyme, was assembled in the channel of SBA-15 b...The hexagonal silica mesoporous material SBA-15 with ordered 2-dimensional channel structure was used as a suppport to the immobilization of emzyme. α-Chymotrypsin, an enzyme, was assembled in the channel of SBA-15 by immersion method. The absorbed amount of enzyme in SBA-15 and the activity of the immobilized enzyme were studied. It was found that there was more absorbed enzyme in SBA-15 than in other carrier and the activity of the immobilized α-chymotrypsin was increased compared with the free enzyme. It suggests that silica mesoporous material SBA-15 is a good support for immobilization of enzyme.展开更多
Silica mesoporous materials were synthesized and used as the supporting materials for immobilization of enzyme.Penicillin G acylase,an enzyme which was used to produce 6-APA in pharmaceutical industry,was immobilized ...Silica mesoporous materials were synthesized and used as the supporting materials for immobilization of enzyme.Penicillin G acylase,an enzyme which was used to produce 6-APA in pharmaceutical industry,was immobilized in the mesoporous materials by the immersion method.The stabilities of the immobilized penicillin G acylase were studied.After incubation at 60 ℃ for 2 h,the activity of immobilized penicillin G acylase remained 80% in the best case.At higher or lower pH,the free enzyme was deactivated quickly,while the immobilized enzyme still retained active.The result of operational stability showed that the immobilized(enzyme) retained 70% of its initial activity after operating for 6 times.These results showed that the stabilities of immobilized penicillin G acylase,related to the pore size of mesoporous materials,were increased significantly compared with those of free enzyme.The improvement of stabilities of immobilized enzyme was significant when the pore size of the mesoporous materials matched the enzyme molecule size.展开更多
A new inorganic-organic hybrid framework microporous material Cd 3(BDC) 0.5(BTC) 2·(DMF)(H 2O)·3DMF·H 3O·H 2O, in which two kinds of carboxylate ligands coordinate with cadmium ions synchronously, ...A new inorganic-organic hybrid framework microporous material Cd 3(BDC) 0.5(BTC) 2·(DMF)(H 2O)·3DMF·H 3O·H 2O, in which two kinds of carboxylate ligands coordinate with cadmium ions synchronously, was obtained under a mild synthesis condition. The titled compound is crystallized in a monoclinic system, space group P2(1)/c with a=1.584 7(7) nm, b=1.426 7(6) nm, c=1.936 3(6) nm, β=113.186(7)°, V=4.024 6(3) nm 3, Z=4, D X=1.947 mg/m 3, M r=1 179.92, μ=1.662 mm -1, F(000)=2 344, R=0.074 8, wR=0.215 1. Three cadmium centers link with each other through BDC or BTC ligand to form a 3-D open framework.展开更多
文摘共价有机框架(COFs)在电催化析氧反应(OER)中的应用得到了广泛的关注。然而,大多数无金属共价有机框架(COFs)的导电性较差,不利于OER反应。四硫富瓦烯(TTF)是一种良好的电子供体,具有快速的电子转移能力,将TTF整合到共价有机框架骨架中将有助于电子的转移。在此,我们报道了一种基于四硫富瓦烯的二维无金属共价有机框架材料,JUC-630。与不含四硫富瓦烯的同类材料(Etta-TdCOF)相比,JUC-630具有较低的过电位(400m V)和塔菲尔斜率(104 m V·dec^(-1))。本研究提出了合理设计功能基元的策略,这有助于大大提高COF材料的OER催化活性。
文摘This paper mainly elaborated the recent developments of the studies on the new type zeohite molecular sieve host-nanoguest composite materials composing of molecular sieve chaimels or cages encapsulated nanoscale materials from the point of nanochemistry and material science,and the trends of development in this field. As the research of the properties of this kind of materials are gomg on. it is possible that this kind of host-guest nanocomposite materials will be usd in some fields. such as science and high technology fields. as the new type of ptical. electrical and magnetic materials in the level of molecular assembly. This paper contains the following contents:hosts and guests; the sizes and shapes of guests; the optical, electrical and magnetic properties of the materials; the syntheses and characterizations of the materials; the applications of the materials and forecast.
文摘The hexagonal silica mesoporous material SBA-15 with ordered 2-dimensional channel structure was used as a suppport to the immobilization of emzyme. α-Chymotrypsin, an enzyme, was assembled in the channel of SBA-15 by immersion method. The absorbed amount of enzyme in SBA-15 and the activity of the immobilized enzyme were studied. It was found that there was more absorbed enzyme in SBA-15 than in other carrier and the activity of the immobilized α-chymotrypsin was increased compared with the free enzyme. It suggests that silica mesoporous material SBA-15 is a good support for immobilization of enzyme.
文摘Silica mesoporous materials were synthesized and used as the supporting materials for immobilization of enzyme.Penicillin G acylase,an enzyme which was used to produce 6-APA in pharmaceutical industry,was immobilized in the mesoporous materials by the immersion method.The stabilities of the immobilized penicillin G acylase were studied.After incubation at 60 ℃ for 2 h,the activity of immobilized penicillin G acylase remained 80% in the best case.At higher or lower pH,the free enzyme was deactivated quickly,while the immobilized enzyme still retained active.The result of operational stability showed that the immobilized(enzyme) retained 70% of its initial activity after operating for 6 times.These results showed that the stabilities of immobilized penicillin G acylase,related to the pore size of mesoporous materials,were increased significantly compared with those of free enzyme.The improvement of stabilities of immobilized enzyme was significant when the pore size of the mesoporous materials matched the enzyme molecule size.
文摘A new inorganic-organic hybrid framework microporous material Cd 3(BDC) 0.5(BTC) 2·(DMF)(H 2O)·3DMF·H 3O·H 2O, in which two kinds of carboxylate ligands coordinate with cadmium ions synchronously, was obtained under a mild synthesis condition. The titled compound is crystallized in a monoclinic system, space group P2(1)/c with a=1.584 7(7) nm, b=1.426 7(6) nm, c=1.936 3(6) nm, β=113.186(7)°, V=4.024 6(3) nm 3, Z=4, D X=1.947 mg/m 3, M r=1 179.92, μ=1.662 mm -1, F(000)=2 344, R=0.074 8, wR=0.215 1. Three cadmium centers link with each other through BDC or BTC ligand to form a 3-D open framework.
