Titanium Pyrophosphate for Removal of Trivalent Heavy Metals and Actinides Simulated by Retention of Europium

Table 3

Eu (III) sorption equilibria onto titanium pyrophosphate and other compounds and associated constants.

Surface complex	log	Compound	Reference
≡XOH + Eu^3+ + ↔  (≡XOH)Eu		TiP2O7	This work
≡XOH + Eu^3+ + ↔  (≡XO)2EuNO3		TiP2O7	This work
2(≡ZrOH) + Eu^3+  ↔ (≡ZrOH)2Eu^3+		ZrP2O7	[38]
2(≡POH) + Eu^3+ + ↔  (≡PO)2Eu + 2H^+		ZrP2O7	[38]
2≡XOH + Eu^3+ + ↔  ≡(XOH)2Eu		ZrP2O7	[40, 41]
2≡XOH + Eu^3+ + ↔  ≡(XO)2EuNO3 + 2H^+	(P2O7)	Th(PO4)4P2O7	[37, 40, 41]
2≡XOH + Eu^3+ + ↔  ≡(XO)2EuNO3 + 2H^+	(PO4)	Th(PO4)4P2O7	[37, 40, 41]
2≡XOH + Eu^3+ + ↔  ≡(XO)2EuNO3 + 2H^+	(PO4)	Zr2O(PO4)2	[37, 40]
2≡XOH + Eu^3+ + ↔  ≡(XO)2EuNO3 + 2H^+	(oxo)	Zr2O(PO4)2	[37, 40]