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The Regulation Effect of Phosphoryl Group on Amino Acid Side Chain

Science China Chemistry 1993年第12期36卷 1451-1458页

作者：赵玉芬李艳梅尹应武李援朝 Department of Chemistry Tsinghua Uniuersity Beijing 100084 PRC

The amino acids’ side chains act as the relay device to modulate the chemical reactivity of the N-phosphoryl amino acids. The N-dialkyl phosphoryl cysteine is stable, but the N-dialkyl phosphoryl serine or threoine was converted into many kinds of products at 40℃. The N-dialkyl phosphoryl gltamic acid is a stable compound, while the N-dislkyl phosphoryl aspartic acid was transferred into the peptides, esters and the phosphoryl ester-exchanged products under mild conditions. The N-dialkyl phosphoryl histidine has the similar reactivity through the co-participation of the side chain, carboxyl and phosphoryl groups. A hexacoordinate phosphorus.was proposed to account for this differentiation and promotion effect.

关键词： N-phosphoryl amino acid amino acid aide chain’s regulation effect partieipation of phosphoryl group hexaeoordinate phosphorus.

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Ab Initio Study of Aluminum-phosphorus.Co-doped Graphene

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Journal of Physical Science and Application 2017年第1期7卷 1-7页

作者： Victor Eduardo Comparan Padilla Maria Teresa Romero de la Cruz Carlos Eduardo Rodriguez Garcia ReyesGarcia Diaz Gregorio Hernandez Cocoletzi Facultad de Ciencias Quimicas Universidad Autonoma de Coahuila Blvd. Venustiano Carranza C.P. 25280 Saltillo CoahuilaMexico Facultada de Ciencias Fisico Matematica Universidad Autonoma de Coahuila Blvd. Venustiano Carranza C.P. 25280 SaltilloCoahuila Mexico Instituto de Fisica Luis Rivera Terrazas Benemerita Universidad Autonoma de Puebla Av. San Claudio y Blvd. 18 Sur C.P.72570 Puebla Puebla Mexico

In the present work it is studied the phosphorus.aluminum co-doping effect on the electronic and structural graphene properties using ab initio calculations in the framework of DFT （density functional theory）. The doping of graphene with substituent heteroatoms can modify the band structures as well as the electron transfer, improving the electronic performance that could enhance the sensing ability in gas sensor devices. The incorporation of heteroatoms in the graphene monolayer alters the unit cell. The alteration degree depends on the dopant concentration. Furthermore, the electronic properties were modified by opening the gap up to 0.61 eV produced by the combination of phosphorus.and aluminum as dopants. The dopant concentration can be controlled, which causes different degrees of semiconductor behavior on the co-doped graphene.

关键词： Density functional theory graphene co-doping band gap aluminum phosphorus.

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Experimental Study of Diatomite Static Adsorption on TP Removal in Bovine Urine Wastewater

Experimental Study of Diatomite Static Adsorption on TP Remo...

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中国材料大会2012

作者： Xueying Li Guangfei Qu Yilu Lin Faculty of Environmental Science and Engineering Kunming University of Science ＆Technology

ISBN: (纸本)9783037856062;3037856068

Pollutions of livestock and poultry breeding to the environment have evolved into a serious social problem, while phosphorus.is a non-renewable resource. This study aims to not only remove the phosphorus.in bovine urine wastewater effectively, but also make it recyclable and reduce the load of the follow-up sewage disposal. Choosing the diatomite as the adsorption material, its adsorption effects and the influence factors of diatomite were investigated by static adsorption method, and the adsorption isothermal curves studied. The results showed that the best adsorption condition was as follows, i.e.,taking 50mL bovine urine wastewater with TP 45.67mg/L, when the diatomite dosage was 3.0g, the pH was 7.0, the adsorption time was at 6.0h with the temperature of 30℃, TP concentrations could be reduced to 9.86mg/L and total phosphorus.removal rate reached at 78.41%. Freundlich equation was better than Langmuir equation in describing the behaviour of adsorption phosphorus.on diatomite. It is believed that diatomite is feasible to be used as adsorption agent for phosphorus.removal from bovine urine wastewater and this promotes the potential of diatomite being used as sewage treatment materials.

关键词： Diatomite Bovine urine Wastewater Adsorption phosphorus.

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