Synthesis and characterization of mesoporous silica films encapsulating titanium dioxide particlesPhotodegradation of 2,4-dichlorophenol

Adams, William A.; Bakker, Martin G.; Macias, Transito; Jefcoat, Irvin A.

doi:10.1016/j.jhazmat.2004.05.015

Cited by 21 publications

(16 citation statements)

References 17 publications

(17 reference statements)

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“…Hence, it is often preferred to use prefabricated nanoparticles with tailored properties to enhance the performance of the final material. Similar to the precursor-based routes, nanoparticles can both be introduced into the mesoporous matrix by a wet-impregnation process [14,15] or be directly incorporated into the sol-gel mixture [1,2,[16][17][18]. Several attempts have been made to introduce titania nanoparticles into a mesoporous matrix to enhance the photocatalytic performance.…”

Section: Introductionmentioning

confidence: 99%

“…Several attempts have been made to introduce titania nanoparticles into a mesoporous matrix to enhance the photocatalytic performance. Adams et al synthesized mesoporous silica films with TiO 2 nanoparticles from an acidic silicic acid solution together with a P123 block copolymer [17]. They observed aggregation of the nanoparticles in mesoporous silica film with a potential reduction in the efficiency of photodegradation.…”

Section: Introductionmentioning

confidence: 99%

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Colloidal aspects relating to direct incorporation of TiO2 nanoparticles into mesoporous spheres by an aerosol-assisted process

Vasiliev

Faure

et al. 2008

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Colloidal aspects relating to direct incorporation of TiO2 nanoparticles into mesoporous spheres by an aerosol-assisted process

Vasiliev

Faure

et al. 2008

Journal of Colloid and Interface Science

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“…With a view to overcome these constraints, concerted efforts have been devoted during last few years to prepare various nano-structured semiconducting materials, so as to improve their surface-to-volume ratio and hence the reaction efficiency, as is reviewed in several articles [2,3]. Another approach has been to confine these nano-particles in certain porous silicate matrices in order to ensure easier catalyst recovery after completion of the reaction and at the same time to provide a hydrophobic environment to catalyst particles [4][5][6][7][8][9][10][11][12]. We have reported recently that the CdS nanocrystallites anchored over certain water-repellent polymeric surface not only exhibit a high catalytic activity for visible light-driven hydrogen production from water splitting, they also maintain a significantly long active life because of the hydrophobic nature of the support [13].…”

Section: Introductionmentioning

confidence: 99%

Structure Sensitivity of Nano-structured CdS/SBA-15 Containing Au and Pt Co-catalysts for the Photocatalytic Splitting of Water

2007

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Photocatalysts containing nanocrystallites of cadmium sulphide dispersed in the channels of mesoporous silicate SBA-15 exhibited enhanced activity for visiblelight mediated splitting of water, as compared to bulk CdS. Whereas the incorporation of 1 wt.% Pt co-catalyst in CdS/ SBA-15 led to a substantial increase in H 2 yield, Au at similar loading resulted in marginally decreased activity.The results indicate that the photocatalytic activity of CdS crystallites is structure sensitive. Similarly, the role of a noble metal may be associated with the particle size dependent micro-structural features, rather than its electronic properties such as the work function or the heat of adsorption of reactant or product molecules.Keywords Nano-structured cadmium sulphide Á Photocatalysis Á Structure sensitivity Á Splitting of water Á Role of noble metal co-catalyst

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“…Examples of the usage of SBA-15 as a host for catalysts are: incorporation of Ti for hydrogen storage and photovoltaic applications [42][43][44], addition of FeW for hydrotreating heavy gas oil, and storage of methanol [45].…”

Section: Hosts For Catalystsmentioning

confidence: 99%

Mesoporous Building Blocks: Synthesis and Characterization of Mesoporous Silica Particles and Films

Björk¹

2013

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On the cover, the structure of SBA-15 is illustrated. Inside the pores SEM micrographs have been inserted showing (clockwise from the top): rods, fibers, a film consisting of rods grown on a substrate, a film consisting of platelets grafted on a substrate, short rods, and platelets. In the center the sheet morphology is presented.© Emma Björk, unless otherwise stated.ISBN: 978-91-7519-516-2 ISSN: 0345-7524 Printed by LiU-tryck, Linköping, Sweden, 2013 Research is formalized curiosity. It is poking and prying with a purposeZora Neale Hurston (1903Hurston ( -1960 i ABSTRACTCatalyst supports, drug delivery systems, hosts for nanoparticles, and solar cells are just some examples of the wide range of exciting applications for mesoporous silica. In order to optimize the performance of a specific application, controlling the material's morphology and pore size is crucial. For example, short and separated particles are beneficial for drug delivery systems, while for molecular sieves, the pore size is the key parameter.In this thesis, mesoporous silica building blocks, crystallites, with hexagonally ordered cylindrical pores were synthesized, with the aim to understand how the synthesis parameters affect the particle morphology and pore size. The synthesis of the particles is performed using a sol-gel process, and in order to increase the pore size, a combination of low temperature, and additions of heptane and NH 4 F was used. By variations in the amounts of reagents, as well as other synthesis conditions, the particle morphology and pore size could be altered. Separated particles were also grown on or attached to substrates to form films. Also, a material with spherical pore structure was synthesized, for the first time using this method.It was found that a variation in the heptane concentration, in combination with a long stirring time, yields a transition between fiber and sheet morphologies. Both morphologies consist of crystallites, which for the fibers are joined end to end, while for the sheets they are attached side by side such that the pores are accessible from the sheet surface. The crystallites can be separated to a rod morphology by decreasing the stirring time and tuning the HCl concentration, and it was seen that these rods are formed within 5 min of static time, even though the pore size and unit cell parameters were evolving for another 30 min. Further studies of the effects of heptane showed that the shape and mesoscopic parameters of the rods are affected by the heptane concentration, up to a value where the micelles are fully saturated with heptane. It was also observed that the particle width increases with decreasing NH 4 F concentration, independent of heptane amount, and a platelet morphology can be formed. The formation time of the particles decrease with decreasing NH 4 F, and the growth mechanism for platelets was further studied. The pore sizes for various morphologies were altered by e.g. variations in the hydrothermal treatment conditions, or the method for removing the surfactants.ii T...

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Synthesis and characterization of mesoporous silica films encapsulating titanium dioxide particlesPhotodegradation of 2,4-dichlorophenol

Cited by 21 publications

References 17 publications

Colloidal aspects relating to direct incorporation of TiO2 nanoparticles into mesoporous spheres by an aerosol-assisted process

Colloidal aspects relating to direct incorporation of TiO2 nanoparticles into mesoporous spheres by an aerosol-assisted process

Structure Sensitivity of Nano-structured CdS/SBA-15 Containing Au and Pt Co-catalysts for the Photocatalytic Splitting of Water

Mesoporous Building Blocks: Synthesis and Characterization of Mesoporous Silica Particles and Films

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