Linear Free Energy Relationship for Actinide Sorption to Graphene Oxide

ACS Applied Materials & Interfaces
Yu Xie, Brian A Powell

Abstract

Th(IV) and Np(V) sorption to graphene oxide (GO) was studied as a function of pH from 0-7.5 and analyte concentrations (0.01-1 mg/L for Th(IV) at pH 3 and 0.005-10 mg/L for Np(V) at pH 7). Starting at pH 1, greater than 90% Th(IV) sorption to GO occurred while significant Np(V) sorption to GO started at pH 5. Surface complexation modeling (SCM) using an electrostatic double layer model simultaneously modeled Th(IV) and Np(V) sorption to GO over the pH and the analyte concentration ranges. The SCM indicated that Th(IV) complexation to sulfonate sites dominated at a low pH 0-3 and its complexation to carboxylate sites dominated at a higher pH 3-7.5. In contrast, Np(V) showed a stronger affinity for sulfonate sites than carboxylate sites over the pH and concentration ranges examined in this work. Combining the results from a previous study on Eu(III) and U(VI) sorption to GO, the affinities of actinide/lanthanide sorption to GO was found to follow the trend in actinide/lanthanide ion effective charges (e.g., Th4+ (+4) > UO22+ (+3.2) > Eu3+ (+3) > NpO2+ (+2.2)), which is similar to actinide sorption to iron oxides and clay minerals. Moreover, a linear free energy relationship was observed between the stability constants for actinid...Continue Reading

References

Dec 23, 2008·Journal of Environmental Radioactivity·Xie ShuiboWang Jingsong
Apr 5, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·Guixia ZhaoXiangke Wang
Nov 13, 2012·Journal of Hazardous Materials·Dien Li, Daniel I Kaplan
Jan 9, 2013·Physical Chemistry Chemical Physics : PCCP·Anna Yu RomanchukJames M Tour
Apr 26, 2013·Environmental Science & Technology·James D BeggAnnie B Kersting
Nov 20, 2014·Physical Chemistry Chemical Physics : PCCP·Wencheng SongXiangke Wang
Jan 12, 2016·Environmental Science & Technology·Yu XieBrian A Powell

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Citations

Sep 28, 2018·Advanced Materials·Zicheng ZuoYuliang Li
Sep 10, 2020·ACS Applied Materials & Interfaces·Nicolas BoulangerAlexandr V Talyzin

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