In situ sorption of technetium using activated carbon

Adsorptive removal of technetium‐99 using macroporous poly(GMA‐co‐EGDMA) modified with diethylene triamine

“…Various synthetic and natural materials have been investigated for their potential use for the removal of Tc from the environment. TcO 4 À can be strongly sorbed on activated carbon, 4,7,8 various synthetic resins and sponges, [9][10][11][12] elemental iron, 13 strongly magnetic iron sulfide material, 6 organic polymers, 14 chitin, and chitosan. 15 The acrylic-based resins are almost ideal for the removal of toxic pollutants like Cu, Co, Ni, Zn, and Cd 16,17 as well as Pb and Hg, 18,19 because they are very stable in a range of buffers from pH 1.0 to 11.0 and resistant to microbial degradation.…”

Determination of technetium-99 in environmental samples: A review

“…Activated carbon adsorption has also been reported for pre-concentration of 99 Tc from water samples [77]. Because of the large specific surface area (400-1600 m 2 g -1 ), 99 Tc can be effectively adsorbed from water samples using activated carbon.…”

“…Since the concentration of 99 Tc in environmental water samples is normally very low, it requires sample pre-treatment to pre-concentrate 99 Tc. The enrichment of 99 Tc can be achieved by a few approaches, including evaporation [76], activated carbon adsorption [77], co-19 precipitation [21,38,40,59,75], and anion exchange chromatography [2,6] according to the volume and the salt content of the sample.…”

“…Because of the large specific surface area (400-1600 m 2 g -1 ), 99 Tc can be effectively adsorbed from water samples using activated carbon. It has been reported that 99 Tc can be rapidly (5 L min -1 ) concentrated from very large volume (several hundred liters) of environmental waters on commercial cartridge filters impregnated with activated carbon [77]. The adsorption efficiency of 99 Tc can be enhanced when 99 Tc is reduced to the low oxidation state of Tc(IV).…”

Testing Guidelines for Technetium-99 Absorption on Activated Carbon

“…Figure 3-3 (excerpted from Gu et al [1996]) shows the Kd dependence on solution pH. Holm et al (2000) examined pH conditions across a larger spectrum and determined that Kd values reach a peak at approximately pH 4, and the Kd will then begin to decrease as the solution pH is decreased below pH 4. Therefore, testing pH dependence during adsorption experiments appears to be a necessary component of the batch adsorption testing.…”