TiO 2 nanocrystals are inserted in the pores of monodispersed mesoporous SiO 2 nanospheres with 20–35 nm diameter by a facile two-step method involving vacuum-rotary evaporation and subsequent calcination. Characterization by XRD, TEM, EDX, FT-IR and N 2 sorption techniques suggests that, the pores of the mesoporous SiO 2 nanosphere can effectively stabilize the anatase phase of TiO 2 nanocrystals with size about 6 nm even at high temperature of 750 °C. The photocatalytic activities of the samples with different TiO 2 loading amount were evaluated by the degradation of Rhodamine B dye in aqueous solution under UV-light irradiation. It is found that photocatalytic efficiencies of these materials are much better than commercial P25. Where the sample with TiO 2 loading of 43 % exhibits the highest photocatalytic efficiencies with complete degradation of Rhodamine B within 32 min, which is attributed to the balance between high surface area and suitable TiO 2 loading amount.
Utilising a general protocol for making surface-imprinted core–shell microparticles via a RAFT-mediated approach, we developed a Cu(II) imprinted polymer with a novel magnetic nanosphere, γ-Fe2O3@meso-SiO2, as support. Attributed to the controlled/living polymerization mechanism of the RAFT polymerization process, the Cu(II) imprinted polymer prepared by RAFT polymerization (IIP-RAFT) presented a more well-defined morphology, more mono-dispersed properties, and much higher magnetic responsiveness, compared to the Cu(II) imprinted polymer prepared by traditional free-radical polymerization (IIP-TP). Moreover, in the static saturation binding experiments, a higher binding capacity of IIP-RAFT (210 mg g−1) than IIP-TP (145 mg g−1) was also found. Afterwards, a series of adsorption experiments were carried out to systematically evaluate the adsorption performance of the as-prepared IIP-RAFT. And the results showed that IIP-RAFT exhibited excellent selectivity, good reusability and desirable dynamic adsorption behavior, and could be an ideal candidate for SPE sorbents for the removal of Cu(II) in real wastewater.
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