A facile and controllable multi-templating approach based on a solo nonionic surfactant to preparing nanocrystalline bimodal meso-mesoporous titania

Insights into the Formation and Properties of Templated Dual Mesoporous Titania with Enhanced Photocatalytic Activity

“…The larger mesopores also contribute to reduce the limitation of the transport of the methyl orange molecules and provide more pathways for products to escape. [42][43][44][45][46]66 From the results reported here, one question arises: can similar results be obtained simply by mixing the two monomodal TiO 2 with different pore sizes? To answer this question, we have prepared a catalyst by mixing 50% of P0/ F100 with 50% of P100/F0.…”

“…In addition, the mesoporosity does not arise from a template effect but it is rather due to the calcination process ant that it can be attributed to an interparticular porosity. More recently based on a multi-templating approach based on a solo nonionic surfactant P123 and peroxotitanic acid, Ru et al have prepared bimodal mesomesoporous titania 46 . The authors assume that under their conditions at high concentration some P123 micelles coalesce.…”

“…More recently using a multitemplating approach based on a solo nonionic surfactant P123 and peroxotitanic acid, Ru et al have prepared bimodal meso-mesoporous titania. 46 The authors assume that under their conditions at high concentration some P123 micelles coalesce. These coalesced micelles are responsible for the formation of the larger mesopore size.…”

“…The first one at around 7 nm arises from the P123 micelles, and the second one at higher values (between 10 and 16 nm, depending on the synthesis conditions) is due to the coalesced micelles. 46 However, no detailed investigation has been performed to support this mechanism. In addition, the pore size distributions are very broad and the two maxima clearly appear only when the BJH method is applied on the desorption branch of the isotherm.…”

Effect of triblock copolymers on crystal growth and the photocatalytic activity of anatase TiO2 single crystals

“…29,30 In recent years, triblock copolymers (polyoxyethylene-polyoxypropylene-polyoxyethylene: PEO-PPO-PEO) have been widely used as blending compatibilizers and interface modiers in biomedical, architectural, chemical, and other, elds. 31,32 As very important water-soluble substances, triblock copolymers spontaneously form micelles in aqueous solution. The cores and the shells of the micelles were mainly composed of PPO and PEO, respectively, and, as growth regulators of inorganic crystals, triblock copolymers have been successfully applied to effectively control the morphology and structure of inorganic particles.…”