Effective nitrosamines trap derived from the in situ carbonized mesoporous silica MCM-41

Yang, Jincai; Yang, Jing; Zhou, Yu; Wei, Lin; Wang, Hong Ji; Zhu, Jian Hua

doi:10.1016/j.jhazmat.2009.11.072

Cited by 18 publications

(15 citation statements)

References 32 publications

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“…Besides, the carbon content of 5%Mg/M41c (8.8%) was less than that of 5%Mg(Ac) 2 /M41c (9.8%, Table , Figure b), owing to the contribution of acetate in carbonization. The characteristic exothermic peak appeared at 530 K for 5%Mg/M41c, whereas it was at 700 K for 5%Mg(Ac) 2 /M41c sample, because various carbon particles with different morphology were crowded in mesoporous channels; hence, their combustion temperature was different.…”

Section: Resultsmentioning

confidence: 97%

“…Also, it is hard for the bulky TSNA molecule (0.4–0.8 nm) to enter the small micropores (smaller than 0.4 nm) formed by these micelles. One method to overcome this awkward situation is to in situ carbonize these micelles, emptying the space inside the channel and forming carbon particles to alter the surface curvature of the channel wall . As a result, the pore volume of M41-c sample reached 0.61 cm 3 g –1 while the mesoporous diameter was adjusted to 2.9 nm (Table ) because it contained 7.9% of carbon (Table ).…”

Section: Discussionmentioning

confidence: 99%

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Creating an Optimal Microenvironment within Mesoporous Silica MCM-41 for Capture of Tobacco-Specific Nitrosamines in Solution

Sun

Wang

et al. 2017

ACS Appl. Mater. Interfaces

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To meet the requirement of capturing tobacco-specific nitrosamines (TSNA) for environment protection, a unique microenvironment was carefully created inside the channels of mesoporous silica MCM-41. In situ carbonization of template micelles at 923 K, combined with the excess aluminum used in one-pot synthesis of MCM-41, is adopted to tailor the tortuosity of mecsoporous channels, while loaded metal oxides (5 wt %) and the Al component in the framework are employed to exert the necessary electrostatic interaction toward the target carcinogens TSNA in solution. The elaborated microenvironment created in mesoporous sorbents was characterized with XRD, N adsorption-desorption, TEM, XPS, and TG-DSC methods. Various solutions of Burley- and Virginia-type tobaccos were used to assess the adsorption performance of new mesoporous sorbents, and the influence of the solid-to-liquid ratio, adsorption time, and loading amount of CuO on the adsorption was carefully examined. The representative sample 5%Cu/AM-10c could capture 27.2% of TSNA in Burley tobacco solution, and its capacity reached 0.3 mg g in Snus tobacco extract solution, offering a promising candidate for the protection of the environment and public health.

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Section: Resultsmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Creating an Optimal Microenvironment within Mesoporous Silica MCM-41 for Capture of Tobacco-Specific Nitrosamines in Solution

Sun

Wang

et al. 2017

ACS Appl. Mater. Interfaces

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“…The distribution of organic carbon precursors in mesostructured silica is a crucial factor to prepare MCS materials with good structural and textural properties via the carbonization process. The encapsulation of organic substance in mesoporous silica channels via wet impregnation 1 , 2 and chemical functionalization of mesostructured silica surface with organosilanes or organic compounds 4 , 13 resulted in the poor distribution of carbon phase in obtained nanocomposites. However, mesostructured organic–inorganic nanocomposites prepared using the evaporation-induced co-assembly method in the presence of phenolic resin-based precursors 15 provided MCS nanocomposites with high carbon content and well-dispersed carbon moieties 15 due to the high dispersion of the polymeric carbon precursor in the mesostructured silicate framework.…”

Section: Resultsmentioning

confidence: 99%

“…Mesoporous carbon/silica nanocomposites (MCS) have received considerable attention in catalysis 1 , adsorption 2 , energy storage 3 , 4 , and drug delivery 5 owing to the combined advantages of inorganic silica and organic carbon in their mesostructure. Silica framework provides high mesoporosity, specific surface area, and thermal/mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

Natural rubber as a renewable carbon source for mesoporous carbon/silica nanocomposites

Yousatit

Pitayachinchot

Wijitrat

et al. 2020

Sci Rep

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This study is the first report on the preparation of mesoporous carbon/silica (MCS) nanocomposites with tunable mesoporosity and hydrophobicity using natural rubber (NR) as a renewable and cheap carbon source. A series of mesoporous nanocomposites based on NR and hexagonal mesoporous silica (HMS) were prepared via an in situ sol-gel process and used as precursors; then, they were converted into MCS materials by controlled carbonization. The NR/HMS precursors exhibited a high dispersion of rubber phase incorporated into the mesostructured silica framework as confirmed by small-angle X-ray scattering and high-resolution transmission electron microscopy. An increase in the carbonization temperature up to 700 °C resulted in MCS nanocomposites with a well-ordered mesostructure and uniform framework-confined wormhole-like channels. The NR/HMS nanocomposites possessed high specific surface area (500-675 m 2 g −1) and large pore volume (1.14-1.44 cm 3 g −1). The carbon content of MCS (3.0-16.1 wt%) was increased with an increase in the H 2 So 4 concentration. Raman spectroscopy and X-ray photoelectron spectroscopy revealed the high dispersion of graphene oxidelike carbonaceous moieties in MCS materials; the type and amount of oxygen-containing groups in obtained MCS materials were determined by H 2 So 4 concentration. The enhanced hydrophobicity of MCS nanocomposites was related to the carbon content and the depletion of surface silanol groups, as confirmed by the water sorption measurement. The study on the controlled release of diclofenac in simulated gastrointestinal environment suggests a potential application of MCS materials as drug carriers. Mesoporous carbon/silica nanocomposites (MCS) have received considerable attention in catalysis 1 , adsorption 2 , energy storage 3,4 , and drug delivery 5 owing to the combined advantages of inorganic silica and organic carbon in their mesostructure. Silica framework provides high mesoporosity, specific surface area, and thermal/mechanical stability. Due to the high density of silanol groups, the silica surface can be simply modified by either direct co-condensation or postsynthesis grafting to acquire various chemically active functionalities to serve a wide range of applications 6,7. However, amorphous carbon is characterized by its tunable physicochemical properties by controlling the ratio of sp 2 /sp 3 bonds and quantity of heteroatoms (i.e., oxygen) 8,9. The oxygen-containing functional groups on the carbon surface provide acidic (i.e., carboxyl, lactone, and phenol) and basic (i.e., pyrone, chromene, ether, and carbonyl) properties 10. An increase in the amount of sp 2-hybridized carbon transforms amorphous carbon into graphite-like carbon with enhanced textural properties and chemical reactivity 11,12. Typically, the preparation of MCS materials consists of two steps. The first step is to introduce an organic substance (e.g., glucose, furfuryl alcohol, phenol, and formaldehyde) as a carbon source into mesostructured silica. Then, the organic substance is converted to ...

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“…These data are 140% higher than that of commercially activated carbons (usually less than 100 F g –1 , The high electrochemical performance of PC800 resulted from its high surface N-content, special sheet morphology, and the special porous structure. Proper doped nitrogen provided lots of adsorption sites for the charges, while sheet morphology improved the rapid mass transfer of electrolyte.…”

Section: Resultsmentioning

confidence: 99%

Facilely Fabricating Multifunctional N-Enriched Carbon

Wan

Sun

et al. 2016

ACS Appl. Mater. Interfaces

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A new synthetic strategy, named "carbonization in limited space" and based on the specific interaction between eutectic salt and dual-ionic liquids (dual-ILs), is reported in this article. N-Containing dual-ILs (1,4-diethyl-1,4-diazaniabicyclo[2,2,2]octane imidazolide-4,5-dicyanoiazolide, [2C2DABCO](2+)[Im](-)[CN-Im](-)) were synthesized as new carbon-nitrogen precursors, while eutectic salt was chosen as a reuseable template in order to facilely fabricate the N-doped porous carbon with sheetlike morphology. Nitrogen can be directly and efficiently incorporated into the porous carbon, resulting in the materials with suitable N content, tunable pore structure, and controllable thickness of sheet as well as high surface area. They exhibited good performance as electrodes for supercapacitors, photocatalysts in degradation of methyl orange (MO) under visible light, and the sorbent to capture tobacco-specific N-nitrosamines (TSNAs) in solution, offering a new simplified but effective method to prepare versatile carbon material.

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Effective nitrosamines trap derived from the in situ carbonized mesoporous silica MCM-41

Cited by 18 publications

References 32 publications

Creating an Optimal Microenvironment within Mesoporous Silica MCM-41 for Capture of Tobacco-Specific Nitrosamines in Solution

Creating an Optimal Microenvironment within Mesoporous Silica MCM-41 for Capture of Tobacco-Specific Nitrosamines in Solution

Natural rubber as a renewable carbon source for mesoporous carbon/silica nanocomposites

Facilely Fabricating Multifunctional N-Enriched Carbon

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