Comparison between batch and column experiments to determine the surface charge properties of rutile TiO2 powder

Li‐doped nanosized TiO2 powder with enhanced photocalatylic acivity under sunlight irradiation

“…6. The IEP of TiO 2 particles, close to 3.5, was much lower than the generally reported value IEP = 5-6, but it was close to that reported by Svecova et al [32] The difference in the IEP value may also be related to the preparation method leading to a surface with different hydroxylation state. Doping TiO 2 with Li + shifted the IEP to higher values, as shown in Fig.…”

“…Even though ζ -potential measurements were carried out in a highly diluted particle concentration, this does not affect the way the results are interpreted, as the ζ -potential value is practically independent of the dispersion concentration. [32] The ζ -potential values of the undoped TiO 2 and the Li + -doped TiO 2 particles vs suspension pH are shown in Fig. 6.…”

The Influence of Acids on Tuning the Pore Size of Mesoporous TiO2 Templated by Non‐Ionic Block Copolymers

“…On the contrary, perchlorate anions show the lowest affinity for titanium dioxide [31] and the complex they form in solution with Ti IV is not stable, [32] thus when HClO 4 is added, the clusters have the minimum repulsion. As a consequence, the clusters condensation might be faster, leading to the very narrow PSD (see Table S1) responsible for the broader hysteresis (see Figure 2A).…”

Sorption of selenium oxyanions on TiO2 (rutile) studied by batch or column experiments and spectroscopic methods

“…The material was finally washed with MilliQ water until the rinsing liquid exhibited a constant pH and conductivity. The physicochemical parameters of this rutile powder have been reported in detail in our previous article [52]: e.g. specific surface area 5 m 2 g −1 , diameters of particle aggregates mainly distributed between 200 nm and 1 m, and pH value of the point of zero charge (pH PZC ) ∼ 4.5-5.…”

“…(i) It can be used in both powder and single crystal forms [42,43], which allows studying the possible influence of surface termination on reactivity; (ii) it is stable over a wide pH range (from pH 2 to 10 [42,44]); (iii) its surface science has been widely investigated and the knowledge of the surface hydroxyl groups is well documented [42,45]; (iv) finally, experimental results can be compared to ab initio calculations thorough DFT modelling of TiO 2 surfaces as has recently been carried out [46][47][48][49]. Two recent studies have dealt with the sorption of selenium oxyanions on TiO 2 , mainly in the anatase phase [50,51], but to our knowledge, a complete study devoted to a well characterized rutile phase [52] has not yet been performed. The objective of the present paper is thus to study the sorption on the rutile surface of two oxyanions of selenium (selenite SeO 3 2− and its hydrogenated forms; selenate SeO 4 2− ) both in batch and column at dynamic conditions.…”