Le V.S.,Medisotec |
Nguyen C.D.,ChoRay Hospital |
Journal of Radioanalytical and Nuclear Chemistry | Year: 2014
Method of W separation from fission-99Mo solution was studied using alumina column and H2SO4/HNO3 eluents. The distribution coefficients of WO4 2- and MoO4 2- ions and the column loading/eluting conditions were investigated to optimize the separation process. 4-6 M H2SO4 solutions were successfully used to elute/separate 99MoO4 2- ions from the alumina column which strongly retained WO4 2- ions without significant W-breakthrough. The developed W/99Mo separation process is fit for being in-line incorporated/integrated in the alkaline dissolution-based process of fission-99Mo recovery currently used in LEU target-based 99Mo production. © 2014 Akadémiai Kiadó, Budapest, Hungary.
Medisotec | Date: 2014-09-19
The invention relates to a method for producing a sorbent material, comprising firstly providing a porous silica substrate, said substrate comprising a plurality of silanol groups on a surface thereof then reacting said silanol groups with either a silicon compound of formula R_(n)Si(OR)_(4-n), where R is an alkyl group and n is 0 or 1, or an aminoalkyl silane of formula R_(m)R_(n)Si(OR)_(4-n-m )having at least two hydrolysable groups attached to silicon, where R is an aminoalkyl group, m is 1 or 2 and n is 0 or 1s or a compound of formula M(OR)_(4), or a mixture of any two or more of the preceding compounds, hydrolysing the product, men reacting hydroxyl groups formed with one or more reagents, wherein each reagent is independently selected from the group consisting of an aminoalkyl silane having at least two hydrolysable groups attached to the silicon and a compound of formula M(OR)_(4), and finally hydrolysing the product, wherein each OR independently is a hydrolysable group and each M independently is Zr, Ti, Hf, Sn, Th, Pb or Ge. There is also described a sorbent material and use of a sorbent material for purifying, separating and concentrating processes.