Effects of inorganic anions on cadmium sorption behaviours on titanate nanotube surfaces.

This manuscript describes the characterization of as-synthesized titanate nanotube (TNT) and its sorption behaviours on cadmium with the interactions of inorganic anions. The X-ray diffraction and transmission electron microscopy found that the nanotube is in sodium titanate crystal phase (Na2Ti3O7) and the pores of TNT are bimodally distributed with nominal pore sizes of 3 and 15 nm. In the binary systems between TNT and anions, the binding affinity is fluoride > phosphate > sulphate with sulphate being the least preferred.

A hierarchically assembled mesoporous ZnO hemisphere array and hollow microspheres for photocatalytic membrane water filtration.

A mesoporous ZnO hemisphere array has been prepared via a topotactic transition of Zn(4)(OH)(6)CO(3)·H(2)O (ZCHH) by chemical bath deposition. Each hemisphere is comprised of a radially oriented nanoflake shell grown on the hemispherical interior. Reaction time-dependent SEM analysis shows that the morphological formation of ZCHH involves a deposition-growth-secondary growth-redeposition procedure.

Selective sorption of divalent cations using a high capacity sorbent.

This manuscript describes the application of a novel sorbent, sodium titanate nanotube (STN) on partitioning of various divalent cations. Seven divalent cations, from alkaline earth, transition and post-transition groups, were used to determine the capacity and selectivity of STN. At pH 3 ± 0.

Sequestration of cadmium ions using titanate nanotube.

In this manuscript, titanate (Na(2)Ti(3)O(7)) nanotubes synthesized from alkali hydrothermal route, with high BET surface area (206 m(2)/g), were used as an effective sorbent to remove cadmium ions from water. Sorption capacity (q(m,Langmuir) = 1.1 mmol/g at pH 7) was higher than other sorbents.

Combination of one-dimensional TiO(2) nanowire photocatalytic oxidation with microfiltration for water treatment.

This paper proposed the fabrication of two different diameter one-dimensional TiO2 nanowires, 10 nm TNW10 and 20-100 nm TNW20, via hydrothermal process using different alkaline sources. TNW10 and TNW20 were used as photocatalysts for the degradation of humic acid (HA), the major natural organic matters (NOMs) in surface and ground water, followed by microfiltration. The evaluation of photocatalytic activities of them showed that TNW10 was superior to the commercial P25 TiO2 while TNW20 was as good as P25.

Self-etching reconstruction of hierarchically mesoporous F-TiO2 hollow microspherical photocatalyst for concurrent membrane water purifications.

We report a large-scale self-etching approach for the synthesis of monodispersed mesoporous F-TiO2 hollow microspheres. The self-etching derived from HF was elucidated by the morphology, chemical composition, and crystal size evolutions from solid to hollow microspheres with the increase in the concentration of H2SO4. The resulting TiO2 hollow microspheres exhibited ease for the concurrent membrane filtration and photocatalysis, providing high potential for engineering application in advanced water treatment, for not only increasing water production but also improving water quality.