Pertechnetate removal by macroporous polymer impregnated with 2-nitrophenyl octyl ether (NPOE)

The loading kinetics of TcO4- from water and I M NaOH solution to macroporous polymer (MPP) impregnated with 2-nitrophenyl octyl ether (NPOE) are reported. The loading process can be simply expressed as: - ln(1 - [TcO4-](MPP)/[TcO4-](MPP,e)) = kt + A, where [TcO4-](MPP) and [TcO4-](MPP,e) respectively refer to the pertechnetate concentration in the MPP phase at time t and the equilibrated value, and A is a constant. With TcO4- in water and in I M NaOH as loading solutions, the overall mass transfer coefficients k are estimated to be 0.058 min(-1) and 0.067 min(-1) and the saturated loading capacities of TcO4 are 8.0 x 10(-8) mol/g wet MPP and 5.6 x 10(-8) mol/g wet MPP, respectively. TcO4- can be easily stripped from loaded MPP by >1 M HNO3 solution. Loading-stripping cycling and breakthrough experiments demonstrate a good performance of NPOE-impregnated MPP, in particular with TcO4- -containing water as the loading feed.