Evaluation of hydroxyapatite/poly(acrylamide-acrylic acid) for sorptive removal of strontium ions from aqueous solution

Development of titanium doped hydroxyapatite for efficient removal of radioactive strontium from contaminated water

“…It is worth noting that the positive value of Δ G ° for HA indicates an endothermic process, while the negative value of Δ G ° for Ti-HA indicates the spontaneous nature of the adsorption process. 5,59 This shows the different behaviors of the Ti-HA surface for Sr( ii ) adsorption because of Ti doping. The increase in the negative Δ G ° value with increasing temperature supports the energetically favorable adsorption at higher temperatures for Sr( ii ) as shown in Table 3.…”

Synthesis and polymeric modification of hydroxyapatite from biogenic raw material for adsorptive removal of Co2+ and Sr2+

“…The IR band at 2926 cm −1 represents symmetric stretching vibration of -CH 2 , the peak observed at 2245 cm −1 corresponds to CN stretching of nitrile group, C=O stretching is indicated by the peak at 1734 cm −1 . The IR bands at 1038 and 566 cm −1 are assigned to the P-O vibration stretching of HAP, and these two bands indicate the existence of apatite intercalated with a polymeric chain [30], the IR bands at 1563, 1508 cm −1 could be attributed to -NO stretching, and the band at 1169 cm −1 could be due to C-O stretching.…”

Controlled bi-functionalization of silica microbeads through grafting of amidoxime/methacrylic acid for Sr(II) enhanced sorption

“…[14][15][16][17][18]. Zeolite, silica and clays have been used under their raw form [19][20][21][22], after chemical modification [23][24][25][26][27], magnetite incorporation [5,28], or extractant impregnation [29]. Sorbents impregnated with Prussian Blue and analogues have also been successfully tested for Sr(II) removal [30,31].…”