Adsorption and photocatalytic decomposition of methylene blue on mesoporous metallosilicates

Moriguchi, Isamu; Honda, Masakuni; Ohkubo, Taro; Mawatari, Yoshio; Teraoka, Yasutake

doi:10.1016/j.cattod.2004.04.034

Cited by 19 publications

(14 citation statements)

References 15 publications

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“…At lower pH, the competition between cationic MB and excess H + ions obstructed the adsorption process, but a decrease in the proton concentration with increasing pH favored the reaction [28]. The adsorption uptake at equilibrium slightly decreased at higher pH, possibly due to the competition between OH À ions and negatively charged MSN AP ions in the system [29].…”

Section: Performance Of Mesostructured Silica and Effect Of Initial Cmentioning

confidence: 98%

Amino modified mesostructured silica nanoparticles for efficient adsorption of methylene blue

Karim

Jalil

Triwahyono

et al. 2012

Journal of Colloid and Interface Science

141

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Section: Performance Of Mesostructured Silica and Effect Of Initial Cmentioning

confidence: 98%

Amino modified mesostructured silica nanoparticles for efficient adsorption of methylene blue

Karim

Jalil

Triwahyono

et al. 2012

Journal of Colloid and Interface Science

141

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“…(2) Intersection angle h quantifies the distance between the centers of any two adjacent spherical pores in a given nanotunnel. As h increases, the throats between the adjacent pores become larger, giving rise to a significant increase in the longitudinal component of the effective diffusion tensor (D 11 ). The impact of h on both the …”

Section: Discussionmentioning

confidence: 99%

“…Hence, the length-scale ratio is l=L $ 10 À4 . Moreover, the characteristic time scale of adsorption processes in mesoporous membranes, e.g., for methylene blue, is 11,34 1=c $ 40 À 80 min, while its diffusion coefficient is 35 D $ 10 À5 cm 2 s À 1 . Hence, the Damk€ ohler number is Da $ Oð10 À3 Þ, which allows its use as a small perturbation parameter.…”

Section: Discussionmentioning

confidence: 99%

“…1), in which nanotunnels composed of pores of radius R ¼ 40 nm are connected by microporous tubes of length l ¼ 10 nm. As h increases, the throats between the adjacent pores become large, giving rise to a significant increase in the longitudinal component of the effective diffusion tensor (D 11 ). The impact of h on both the transverse diffusion (D 22 ) and the effective reaction constant (c eff ) is less pronounced.…”

Section: B Intersection Angle Hmentioning

confidence: 99%

“…10 For instance, introduction of active sites onto pore surfaces of mesoporous metallosilicate materials is a promising venue for designing novel adsorbents and catalysis. 11 Embedment of microporous tubes 12 between layers of macro-and nanopores results in new materials with superior mechanical and thermal properties. 13 For example, hierarchical nanoporous carbons with mesopores and micropores have shown high specific electric double layer capacitances and high rate capability in an organic electrolyte.…”

Section: Introductionmentioning

confidence: 99%

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Design of nanoporous materials with optimal sorption capacity

Zhang

Urita

Moriguchi

et al. 2015

Journal of Applied Physics

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Modern technological advances have enabled one to manufacture nanoporous materials with a prescribed pore structure. This raises a possibility of using controllable pore-scale parameters (e.g., pore size and connectivity) to design materials with desired macroscopic properties (e.g., diffusion coefficient and adsorption capacity). By relating these two scales, the homogenization theory (or other upscaling techniques) provides a means of guiding the experimental design. To demonstrate this approach, we consider a class of nanoporous materials whose pore space consists of nanotunnels interconnected by nanotube bridges. Such hierarchical nanoporous carbons with mesopores and micropores have shown high specific electric double layer capacitances and high rate capability in an organic electrolyte. We express the anisotropic diffusion coefficient and adsorption coefficient of such materials in terms of the tunnels' properties (pore radius and inter-pore throat width) and their connectivity (spacing between the adjacent tunnels and nanotube-bridge density). Our analysis is applicable for solutes that undergo a nonequilibrium Langmuir adsorption reaction on the surfaces of fluid-filled pores, but other homogeneous and heterogeneous reactions can be handled in a similar fashion. The presented results can be used to guide the design of nanoporous materials with optimal permeability and sorption capacity. V C 2015 AIP Publishing LLC. [http://dx

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Direct Assembly of Mesoporous Silica Functionalized with Polypeptides for Efficient Dye Adsorption

Bastakoti

Pramanik

et al. 2015

Chemistry A European J

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Herein, we introduce a new polypeptide-functionalized mesoporous silica template fabricated from a biodegradable poly(ethylene oxide-b-ɛ-caprolactone) (PEO-b-PCL) diblock copolymer and a poly(tyrosine) (PTyr) biopolymer. The crystallization behavior of the PEO-b-PCL diblock copolymer changes after blending, but the secondary structure of PTry remains stable. After selective solvent extraction in THF, the PEO-b-PCL is removed, but PTyr remains within the silica matrix due to its different solubility. Fourier-transform IR spectroscopic analysis (FTIR), thermal gravitometry analysis (TGA), small-angle X-ray scattering (SAXS), and X-ray diffraction (XRD) studies confirm the retention of PTyr to form a polypeptide-functionalized mesoporous material. The adsorption of methylene blue hydrate (MB) from aqueous solution into the polypeptide-functionalized mesoporous silica is investigated, thus revealing that the nanocomposite exhibits a high adsorption capacity relative to pure silica due to hydrogen-bonding interactions between the hydroxy phenolic group of PTyr and the N-containing aromatic ring from MB.

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Adsorption and photocatalytic decomposition of methylene blue on mesoporous metallosilicates

Cited by 19 publications

References 15 publications

Amino modified mesostructured silica nanoparticles for efficient adsorption of methylene blue

Amino modified mesostructured silica nanoparticles for efficient adsorption of methylene blue

Design of nanoporous materials with optimal sorption capacity

Direct Assembly of Mesoporous Silica Functionalized with Polypeptides for Efficient Dye Adsorption

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