Ion Exchange and Sorption Properties of Titanium Phosphates

Titanium phosphates are a diverse class of inorganic materials characterised by a framework of titanium centres coordinated to phosphate groups and hydroxyl moieties. In their protonated form, these materials exhibit considerable ion-exchange capabilities, with exchangeable protons readily replaced by metal cations. The layered and tunnel structures of many titanium phosphate phases afford high surface areas and accessible exchange sites, yielding pronounced affinity for a range of inorganic ions. Sorption arises from a combination of ion-exchange, surface complexation and, in some cases, precipitation within the phosphate matrix. These mechanisms underpin applications in water treatment, heavy-metal remediation, lithium-salt purification and the immobilisation of radionuclides. The tunable porosity, chemical stability and ease of synthesis—via sol–gel, hydrothermal or precipitation routes—have prompted extensive investigation into tailoring particle size, crystallinity and composite formation. By controlling functionalisation and hybridisation with carbonaceous supports, titanium phosphates can be optimised for selectivity, kinetics and capacity, addressing global challenges in environmental protection and resource recovery.

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Ion Exchange and Sorption Properties of Titanium Phosphates publication trend

The graph below shows the total number of articles in ion exchange and sorption properties of titanium phosphates across all publications each year (not limited to Nature Index journals).

Technical terms

Ion exchange: Reversible replacement of ions in the solid lattice by ions in solution.

Sorption: Combined processes of adsorption and ion exchange leading to removal of solutes from solution.

Cation exchange capacity (CEC): Maximum number of exchangeable cations per unit weight of material.

Intraparticle diffusion: Rate-controlling step involving migration of ions into internal pores.

Pseudo-second-order kinetics: A sorption kinetic model assuming rate proportional to the square of unoccupied sites.

References

1. Comparison of the Sorption Kinetics of Lead(II) and Zinc(II) on Titanium Phosphate Ion-Exchanger. International Journal of Molecular Sciences (2020).
2. Easily Prepared Titanium Phosphate-Based Composites for the Remediation of Synthetic and Real Wastewaters. Water, Air, & Soil Pollution (2023).
3. Investigation on Purification of Saturated LiNO3 Solution Using Titanium Phosphate Ion Exchanger: Kinetics Study. International Journal of Molecular Sciences (2022).