Achieving global optimization of inorganic sorbent efficacy, as well as tailoring sorbent specificity for target sorbates would facilitate increased wide-spread use of these materials in applications such as producing potable water or nuclear waste treatment. Sodium titanates have long been known as sorbents for radionuclides;90 Sr and transuranic elements in particular. We have developed a related class of materials, which we refer to as peroxo-titanates: these are sodium titanates or hydrous titanates processing, storing and utilizing the peroxo-titanate as an aqueous slurry rather than a dry powder, and post-synthesis acidification. All three synthesis modifications; addition of hydrogen peroxide, use of a slurry form and acidification can be applied more broadly to the optimization of other metal oxide sorbents and other ion separations processes.

Page 13107, Figure 3. The reported isotope effect 18 k bridge for hydrolysis of the monoanion of mNBP is in error; the correct value is 1.0157 ( 0.0009. For comparison, 18 k bridge for pNPP monoanion hydrolysis is 1.0087. Since the maximum 18 k bridge for the alkyl leaving group mNBP is expected to be about twice 1 that for the aryl leaving group in pNPP, the KIEs for the two monoanion reactions are similar in proportion to their respective upper limits. This indicates a similar extent of P-O bond fission in the two reactions. The other data reported in the paper are unaffected. The major conclusion, that the data are most consistent with a pre-equilibrium proton transfer followed by rate-determining P-O bond fission for both pNPP and mNBP, is unchanged.