scholarly journals Layer-by-Layer Assembly and Photocatalytic Activity of Titania Nanosheets on Coal Fly Ash Microspheres

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Xing Cui ◽  
Jianwen Shi ◽  
Zhilong Ye ◽  
Zhaoji Zhang ◽  
Bin Xu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Fly Ash ◽  
Coal Fly Ash ◽  
Layer By Layer ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Visible Absorption ◽  
Layer By Layer Assembly ◽  
Decoloration Rate ◽  
Layer Assembly

In order to address the problem with titania distribution and recovery, series of Ti0.91O2/CFA photocatalysts (Ti0.91O2/CFA-n,n=2,4,6,and8) were fabricated by assembling Ti0.91O2nanosheets on coal fly ash (CFA) microspheres via the layer-by-layer assembly (LBLA) process and characterized by scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), N2-sorption, and ultraviolet-visible absorption (UV-vis) techniques. The SEM images and UV-vis spectra illustrated that Ti0.91O2nanosheets were immobilized successfully on the CFA by the LBLA approach and changed the characteristics of CFA noticeably. The photocatalytic activity of Ti0.91O2/CFA was evaluated by the photodegradation of methylene blue (MB) under UV irradiation. The results demonstrated that Ti0.91O2/CFA-6 showed the best photocatalytic activity among the series of Ti0.91O2/CFA irradiated for 60 min, with a decoloration rate above 43%. After photocatalysis, the Ti0.91O2/CFA could be easily separated and recycled from aqueous solution and Ti0.91O2nanosheets were still anchored on the CFA.

Facile Fabrication and Efficient Photocatalytic Activity of 3D-Ordered Macroporous ZnO Film

2012 ◽  
Vol 509 ◽  
pp. 259-265
Author(s):  
Hao Xie ◽  
Tao Zeng ◽  
Xue Lai Wang ◽  
Xiu Jian Zhao
Keyword(s):  
Photocatalytic Activity ◽  
Solar Light ◽  
Latex Film ◽  
Layer By Layer ◽  
X Ray Diffraction ◽  
Zno Film ◽  
Visible Absorption ◽  
Simulated Solar Light ◽  
Facile Fabrication ◽  
Ordered Macroporous

Three-dimensionally (3D) ordered macroporous ZnO film was fabricated on a glass slide by layer-by-layer depositing and hydrolysis of Zn(CH3COO)2using 3D-ordered latex film as template followed by calcination at 450 °C for 2 h to remove the organic template. The as-prepared 3D-ordered macroporous ZnO film was characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), diffusive reflectance UV-visible absorption spectra (DRUV-VIS), photoluminescence (PL), and photoelectrochemical measurement. Its photocatalytic activity was evaluated by the photocatalytic degradation of crystal violet (CV) aqueous solution at ambient temperature under the irradiation of simulated solar light. It was found that the 3D-ordered ZnO film exhibits efficient photocatalytic activity for photodegradation of CV under the irradiation of simulated solar light.

Characterization of nano-structured poly(ε-caprolactone) membranes with DNA-doped polypyrrole via sonication-induced layer-by-layer assembly

2018 ◽  
Vol 89 (7) ◽  
pp. 1267-1275
Author(s):  
Geon Jin Kim ◽  
Kee Jong Yoon ◽  
Ick Soo Kim ◽  
Kyu Oh Kim
Keyword(s):  
Contact Angle ◽  
Fiber Diameter ◽  
Good Survival ◽  
Cytotoxicity Test ◽  
Layer By Layer ◽  
X Ray Diffraction ◽  
Force Microscopy ◽  
Atomic Force ◽  
Layer By Layer Assembly ◽  
Layer Assembly

In this study, the formation of conductive nano-structured polypyrrole (PPy) on electrospun poly(ɛ-caprolactone) (PCL) nanofibers was successfully achieved using a DNA dopant (PCL/DNA-PPy) via sonication-induced layer-by-layer assembly. After PPy containing positive charges was accumulated on PCL, DNAs with negative charges deposited such that they were evenly distributed. The resulting PCL/DNA-PPy nanomembrane exhibited increased fiber diameter (PCL/DNA-PPy 5LBL: 328.11 ± 48 nm) and deformation morphology compared to pure PCL (average fiber diameter of 247.25 ± 32 nm, fibrous uniform morphology), as observed using scanning electron microscopy and atomic force microscopy. As the number of layers increased, the crystallinity of PCL/DNA–PPy nanomembranes decreased, as observed using X-ray diffraction. It was observed that the PPy-DNA deposited on the surface of PCL connected to form a nano-sheath and significantly increased the thermal stability of PCL. Moreover, the contact angle of the PCL/DNA-PPy nanomembrane (contact angle of pure PCL: 79.3 ± 1.2°) demonstrated its high hydrophilicity. The results indicate that the composites showed very good survival in a cytotoxicity test on U-118 glioma cells and excellent electrical conductivity (the highest value was 1.1 × 10−3 S/m). The manufactured PCL/DNA–PPy nanomembranes are considered to be promising materials for applications in the scaffold, sensor, and electronic fields.

Layer-by-layer assembly of TiO2nanowire/carbon nanotube films and characterization of their photocatalytic activity

2011 ◽  
Vol 22 (19) ◽  
pp. 195701 ◽  
Author(s):  
Mária Darányi ◽  
Tamás Csesznok ◽  
Ákos Kukovecz ◽  
Zoltán Kónya ◽  
Imre Kiricsi ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Carbon Nanotube ◽  
Layer By Layer ◽  
Layer By Layer Assembly ◽  
Layer Assembly ◽  
Nanotube Films

Layer-by-layer assembly of Ag2S quantum dots-sensitized ZnO/SnO2 core-shell nanowire arrays for enhanced photocatalytic activity

2020 ◽  
Vol 384 (26) ◽  
pp. 126708
Author(s):  
Jinshen Lan ◽  
Mengyao Gao ◽  
Choonyian Haw ◽  
Imran Khan ◽  
Jingtian Zhao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Nanowire Arrays ◽  
Core Shell ◽  
Layer By Layer ◽  
Layer By Layer Assembly ◽  
Ag2s Quantum Dots ◽  
Layer Assembly

Complex formation of modified chitosan and carboxymethyl cellulose and its effect on paper properties

TAPPI Journal ◽  
2009 ◽  
Vol 8 (6) ◽  
pp. 29-35 ◽  
Author(s):  
PEDRAM FATEHI ◽  
LIYING QIAN ◽  
RATTANA KITITERAKUN ◽  
THIRASAK RIRKSOMBOON ◽  
HUINING XIAO
Keyword(s):  
Carboxymethyl Cellulose ◽  
Polymer System ◽  
Layer By Layer ◽  
Paper Strength ◽  
Anionic Polymer ◽  
Paper Properties ◽  
Modified Chitosan ◽  
Layer By Layer Assembly ◽  
Polyelectrolyte Titration ◽  
Layer Assembly

The application of an oppositely charged dual polymer system is a promising approach to enhance paper strength. In this work, modified chitosan (MCN), a cationic polymer, and carboxymethyl cellulose (CMC), an anionic polymer, were used sequentially to improve paper strength. The adsorption of MCN on cellulose fibers was analyzed via polyelectrolyte titration. The formation of MCN/CMC complex in water and the deposition of this complex on silicon wafers were investigated by means of atomic force microscope and quasi-elastic light scattering techniques. The results showed that paper strength was enhanced slightly with a layer-by-layer assembly of the polymers. However, if the washing stage, which was required for layer-by-layer assembly, was eliminated, the MCN/CMC complex was deposited on fibers more efficiently, and the paper strength was improved more significantly. The significant improvement was attributed to the extra development of fiber bonding, confirmed further by scanning electron microscope observation of the bonding area of fibers treated with or without washing. However, the brightness of papers was somewhat decreased by the deposition of the complex on fibers. Higher paper strength also was achieved using rapid drying rather than air drying.

Stabilization of starch-based microgel-lysozyme complexes using a layer-by-layer assembly technique

2017 ◽  
Vol 214 ◽  
pp. 213-217 ◽  
Author(s):  
Bao Zhang ◽  
Yi Pan ◽  
Hanqing Chen ◽  
Tengfei Liu ◽  
Han Tao ◽  
...  
Keyword(s):  
Layer By Layer ◽  
Layer By Layer Assembly ◽  
Assembly Technique ◽  
Layer Assembly
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