РОССИЙСКАЯ АКАДЕМИЯ НАУК

УРАЛЬСКОЕ ОТДЕЛЕНИЕ

ИНСТИТУТ ХИМИИ TBEPДОГО ТЕЛА
   
| | | | |
| | | |
 09.01.2008   Карта сайта     Language По-русски По-английски
Новые материалы
Экология
Электротехника и обработка материалов
Медицина
Статистика публикаци


09.01.2008



Holding on to heavy metals



08 January 2008



Structurally simple ligands that selectively bind to mercuric chloride could help remove this toxic salt from the environment, say scientists from India.


The tripodal ligands, developed by Parimal Bharadwaj and colleagues at The Indian Institute of Technology Kanpur, exploit the ready reactivity of mercuric chloride (MgCl2) with nitrogen and oxygen atoms. The ligand binds the salt, in 90-95 per cent yield, through a central nitrogen atom, and one or more of the three ethereal oxygen atoms that form the ligand's legs. The team claims their ligands selectively bind mercuric chloride in the presence of other metal ions.


Bharadwaj has also shown that the ligands can be recycled. Adding silver hexafluorophosphate to a solution of the mercury-ligand complex displaces the mercury, giving a complex where the ligands surround a hexafluorophosphate anion. Extracting an aqueous solution of this complex with organic solvent returns the free ligand, which can be reused to trap mercury.


 


hexafluorophosphate and ligands








The tripodal ligands can by recycled by forming complexes with hexafluorophosphate ions



 


'Mercuric chloride is extremely toxic and can easily enter biological cycles - to remove it from its place of formation is a challenging problem,' said Bharadwaj. The salt can be found in crude oil, and is formed during electrochemical processes, added Bharadwaj. 'We've shown that simple and cheap tripodal ligands can selectively bind mercuric chloride, and the entire process can be recycled many times.'


David Atwood, University of Kentucky, US, who has developed mercury ion-binding ligands, commented that the Kanpur team haven't shown that their tripodal ligands actually work in the environment. 'Their reactions aren't run in water, or in hydrocarbons for the oil application, but rather in methanol,' he said.


We are continuing to develop ligands that can selectively bind heavy metals ions, said Bharadwaj. 'Binding a particular metal ion in the presence of many others remains a challenging problem, although there are a few ground rules we can follow,' he said.


James Mitchell Crow




Link to journal article



Binding of HgCl2 by tripodal ligands controlled by AgPF6: receptors for the PF6 anion
Ashutosh S. Singh and Parimal K. Bharadwaj, Dalton Trans., 2008
DOI: 10.1039/b714654j


Дизайн и программирование N-Studio 
А Б В Г Д Е Ё Ж З И Й К Л М Н О П Р С Т У Ф Х Ц Ч Ш Щ Ъ Ы Ь Э Ю Я
  • Chen Wev .  honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

  • © 2004-2019 ИХТТ УрО РАН
    беременность, мода, красота, здоровье, диеты, женский журнал, здоровье детей, здоровье ребенка, красота и здоровье, жизнь и здоровье, секреты красоты, воспитание ребенка рождение ребенка,пол ребенка,воспитание ребенка,ребенок дошкольного возраста, дети дошкольного возраста,грудной ребенок,обучение ребенка,родить ребенка,загадки для детей,здоровье ребенка,зачатие ребенка,второй ребенок,определение пола ребенка,будущий ребенок медицина, клиники и больницы, болезни, врач, лечение, доктор, наркология, спид, вич, алкоголизм православные знакомства, православный сайт творчeства, православные рассказы, плохие мысли, православные психологи рождение ребенка,пол ребенка,воспитание ребенка,ребенок дошкольного возраста, дети дошкольного возраста,грудной ребенок,обучение ребенка,родить ребенка,загадки для детей,здоровье ребенка,зачатие ребенка,второй ребенок,определение пола ребенка,будущий ребенок