Self-Assembly of Active Bi2O3/TiO2Visible Photocatalyst with Ordered Mesoporous Structure and Highly Crystallized Anatase

2008 ◽  
Vol 112 (16) ◽  
pp. 6258-6262 ◽  
Author(s):  
Zhenfeng Bian ◽  
Jian Zhu ◽  
Shaohua Wang ◽  
Yong Cao ◽  
Xufang Qian ◽  
...  
Keyword(s):  
Self Assembly ◽  
Mesoporous Structure ◽  
Ordered Mesoporous

scholarly journals Ni-containing catalysts based on ordered mesoporous MgO–Al2O3for methane dry reforming

2018 ◽  
Vol 5 (1) ◽  
pp. 59-66 ◽  
Author(s):  
Svetlana Pavlova ◽  
Yuliya Fedorova ◽  
Arkadii Ishchenko ◽  
Maxim Melgunov ◽  
Elena Melgunova ◽  
...  
Keyword(s):  
Self Assembly ◽  
Mesoporous Structure ◽  
Dry Reforming ◽  
One Pot ◽  
Methane Dry Reforming ◽  
Pluronic P123 ◽  
Ordered Mesoporous ◽  
Evaporation Induced Self Assembly ◽  
The One ◽  
Adsorption Desorption

Abstract The ordered mesoporous Mg- and Ni-Mg-alumina samples of general formula xwt%Mg-Al2O3 and ywt%Nixwt% Mg-Al2O3(x, y = 5, 10 % wt) have been prepared by the one-pot evaporation induced self-assembly (EISA) method using Pluronic P123 as a template. The textural and structural properties of the prepared samples have been characterized by N2adsorption-desorption analysis, BET, XRD, TEM with EDX, HAADF-STEM, and H2-TPR. The samples calcined at 700°C had an ordered mesoporous structure with a SSA of 170-250 m2/g, a pore volume of 0.5-0.64 cm3/g and a narrow distribution of the pore size (mean 12-16 nm). For the catalysts prepared by the one-pot EISA method, the size of the metal Ni particles was in the range of 3-12 nm and was conditioned by their confinement in the mesopores and the interaction with MgO and Al2O3. Testing in methane dry reforming in the 15v.% CH4+ 15v.%CO2feed, with He balance, at 650-750°C and the contact time of 0.015 s has shown the higher activity and stability of the ordered mesoporous 10w%Ni- 10w%Mg-Al2O3catalysts prepared by the one-pot method as compared with the catalyst of the same composition obtained by impregnation.

scholarly journals Synthesis and characterization of boron-doped ordered mesoporous carbon by evaporation induced self-assembly under HCl conditions

RSC Advances ◽  
2017 ◽  
Vol 7 (14) ◽  
pp. 8250-8257 ◽  
Author(s):  
Yan Zhang ◽  
Wenwen Dai ◽  
Yujian Liu ◽  
Binge Ma
Keyword(s):  
Self Assembly ◽  
Driving Force ◽  
Mesoporous Carbon ◽  
Boron Content ◽  
Mesoporous Structure ◽  
Synthesis And Characterization ◽  
Boron Doped ◽  
Ordered Mesoporous ◽  
Evaporation Induced Self Assembly

With double-layer hydrogen bonding and electrostatic Coulomb forces acting as the driving force, the obtained B-OMC has the well-ordered mesoporous structure, highest surface area (689.85 m2 g−1) and boron content (1.96 wt%) when pH = 4.

Preparation of Hierarchical and Ordered Porous Nanostructured Carbons

2014 ◽  
Vol 912-914 ◽  
pp. 273-276
Author(s):  
Jiang Tao Cai ◽  
An Ning Zhou ◽  
Xiao Yan Li ◽  
Ju Yan Yan ◽  
Li Juan Wang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Carbon Materials ◽  
Physical Adsorption ◽  
Mesoporous Structure ◽  
Alcohol Solution ◽  
Bet Surface Area ◽  
Ordered Mesoporous ◽  
Evaporation Induced Self Assembly ◽  
Nanostructured Carbons ◽  
Ordered Porous

The hierarchical and ordered porous nanostructured carbons (HOPNCs) have a very wide application in catalysis, adsorption separation, energy storage and other fields. In this paper, the HOPNCs was prepared through a dual-template method and the resole resin as the carbon precursor,followed by the ethanol solvent evaporation induced self-assembly process. The morphology and microstructure of the as-made products were characterized by SEM, XRD, TEM,and physical adsorption instrument. The results showed that the orderliness of mesoporous carbon materials are significantly enhanced while the ratio of P123/F127 was 1/3,a proper low concentration of template and alcohol solution was helpful to the solvent induced selfassembly formed ordered mesoporous structure of nanocarbons.The as-made HOPNCs have large pores of 200 nm or so, mesopores of 8 and 3 nm or so, the pore volume of 0.2527 cm3/g , the BET surface area of 510m2/g.

Nitrogen-doped ordered mesoporous carbon sphere with short channel as an efficient metal-free catalyst for oxygen reduction reaction

RSC Advances ◽  
2015 ◽  
Vol 5 (86) ◽  
pp. 70010-70016 ◽  
Author(s):  
Jinlei Li ◽  
Zelong Li ◽  
Jinhui Tong ◽  
Chungu Xia ◽  
Fuwei Li
Keyword(s):  
Self Assembly ◽  
Mesoporous Carbon ◽  
Mesoporous Structure ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Carbon Sphere ◽  
Short Channel ◽  
Nitrogen Doped ◽  
Assembly Method ◽  
Ordered Mesoporous

N-OMCS has been fabricated by an aqueous self-assembly method. The formation of the mesoporous structure with short channel facilitates the mass transfer in ORR. The N-OMCS-1.5-900 shows excellent catalytic activity and durability in alkaline media.

scholarly journals Mesoporous MgTa2O6 thin films with enhanced photocatalytic activity: On the interplay between crystallinity and mesostructure

2012 ◽  
Vol 3 ◽  
pp. 123-133 ◽  
Author(s):  
Jin-Ming Wu ◽  
Igor Djerdj ◽  
Till von Graberg ◽  
Bernd M Smarsly
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Calcination Temperature ◽  
Self Assembly ◽  
Sol Gel ◽  
Mesoporous Structure ◽  
Ordered Mesoporous ◽  
Mesoporous Film ◽  
Evaporation Induced Self Assembly ◽  
Poly Ethylene

Ordered mesoporous, crystalline MgTa2O6 thin films with a mesoscopic nanoarchitecture were synthesized by evaporation-induced self-assembly (EISA) in combination with a sol–gel procedure. Utilization of novel templates, namely the block copolymers KLE (poly(ethylene-co-butylene)-b-poly(ethylene oxide)) and PIB6000 (CH3C(CH3)2(CH2C(CH3)2)107CH2C(CH3)2C6H4O(CH2CH2O)100H), was the key to achieving a stable ordered mesoporous structure even upon crystallization of MgTa2O6 within the mesopore walls. The effect of the calcination temperature on the ability of the mesoporous films to assist the photodegradation of rhodamine B in water was studied. As a result, two maxima in the photocatalytic activity were identified in the calcination temperature range of 550–850 °C, peaking at 700 °C and 790 °C, and the origin of this was investigated by using temperature-dependent X-ray scattering. Optimal activity was obtained when the mesoporous film was heated to 790 °C; at this temperature, crystallinity was significantly high, with MgTa2O6 nanocrystals of 1.6 nm in size (averaged over all reflections), and an ordered mesoporous structure was maintained. When considering the turnover frequency of such photocatalysts, the optimized activity of the present nanoarchitectured MgTa2O6 thin film was ca. four times that of analogous anatase TiO2 films with ordered mesopores. Our study demonstrated that high crystallinity and well-developed mesoporosity have to be achieved in order to optimize the physicochemical performance of mesoporous metal-oxide films.

Synthesizing a surface-imprinted polymer based on the nanoreactor SBA-15 for optimizing the adsorption of salicylic acid from aqueous solution by response surface methodology

2021 ◽  
Vol 45 (14) ◽  
pp. 6192-6205
Author(s):  
Haiqing Xu ◽  
Yuhang Gao ◽  
Qiantu Tao ◽  
Aiping Li ◽  
Zhanchao Liu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Response Surface Methodology ◽  
Salicylic Acid ◽  
Response Surface ◽  
Molecularly Imprinted Polymer ◽  
Adsorption Property ◽  
Mesoporous Structure ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Ordered Mesoporous

The molecularly imprinted polymer prepared on the nanoreactor SBA-15 displayed excellent ordered mesoporous structure and superior adsorption property for salicylic acid.

Ordered Mesoporous Materials from Metal Nanoparticle-Block Copolymer Self-Assembly

Science ◽  
2008 ◽  
Vol 320 (5884) ◽  
pp. 1748-1752 ◽  
Author(s):  
S. C. Warren ◽  
L. C. Messina ◽  
L. S. Slaughter ◽  
M. Kamperman ◽  
Q. Zhou ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Mesoporous Materials ◽  
Self Assembly ◽  
Metal Nanoparticle ◽  
Ordered Mesoporous Materials ◽  
Ordered Mesoporous

scholarly journals Covalent Organic Framework-Functionalized Magnetic CuFe2O4/Ag Nanoparticles for the Reduction of 4-Nitrophenol

2020 ◽  
Author(s):  
Chen Hou ◽  
Dongyan Zhao ◽  
Wenqiang Chen ◽  
Hao Li ◽  
Sufeng Zhang ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Silver Ions ◽  
Mesoporous Structure ◽  
Order Rate Constant ◽  
High Specific Surface Area ◽  
Stacking Interactions ◽  
First Order ◽  
Pi Stacking ◽  
Ordered Mesoporous ◽  
Nano Catalysts

In this work, magnetic CuFe2O4/Ag nanoparticles activated by porous covalent organic frameworks (COF) was fabricated to evaluate the heterogenous reduction of 4-nitrophenol (4-NP). The core-shell CuFe2O4/Ag@COF was successfully prepared by polydopamine reduction of silver ions on CuFe2O4 nanoparticles, followed by COF layer condensation. With integrating the intrinsic characteristics of the magnetic CuFe2O4/Ag core and COF layer, the obtained nanocomposite exhibited features of high specific surface area (464.21 m2 g-1), ordered mesoporous structure, strong environment stability, as well as fast magnetic response. Accordingly, the CuFe2O4/Ag@COF catalyst showed good affinity towards 4-NP via π-π stacking interactions and possessed enhanced catalytic activity compared with CuFe2O4/Ag and CuFe2O4@COF. The pseudo-first-order rate constant of CuFe2O4/Ag@COF (0.77 min-1) is 3 and 5 times higher than CuFe2O4/Ag and CuFe2O4@COF, respectively. The characteristics of bi-catalytic CuFe2O4/Ag and the porous COF shell of CuFe2O4/Ag@COF made a contribution to improve the activity of 4-NP reduction. The present work demonstrated a facile strategy to fabricate COF activated nano-catalysts with enhanced performance in the fields of nitrophenolic wastewater treatment.

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