scholarly journals Construction of stable core–shell imprinted Ag-(poly-o-phenylenediamine)/CoFe2O4 photocatalyst endowed with the specific recognition capability for selective photodegradation of ciprofloxacin

RSC Advances ◽  
2017 ◽  
Vol 7 (77) ◽  
pp. 48894-48903 ◽  
Author(s):  
Ziyang Lu ◽  
Zehui Yu ◽  
Jinbo Dong ◽  
Minshan Song ◽  
Yang Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
High Photocatalytic Activity ◽  
Core Shell ◽  
Specific Recognition ◽  
Stable Core ◽  
Recognition Capability

The stable core–shell imprinted Ag-POPD/CoFe2O4 photocatalyst not only possessed high photocatalytic activity, but also exhibited the superior specific recognition capability for selective photodegradation of CIP.

Effect of Metal Gradient In Nano Wall of Stratified Type Photocatalyst

2009 ◽  
Vol 631-632 ◽  
pp. 339-344
Author(s):  
Tsugumi Hayashi ◽  
Yohei Baba ◽  
Toshiharu Taga ◽  
Shun Yokoyama ◽  
Hiroaki Suzuki ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Detailed Analysis ◽  
Crystalline Structure ◽  
Visible Light Irradiation ◽  
High Photocatalytic Activity ◽  
Core Shell ◽  
Shell Type ◽  
Metal Element ◽  
Egg Shell

Objective of study was the development of core-shell type ZnS-CdS photocatalyst with the stratified morphology. To form the stratified morphology, condition of the precursor is extremely important. For this purpose, three types of precursors, thus core-shell type, egg-shell type and uniform type, was tried to synthesize by utilizing the results of the calculation. The size of the synthesized precursor particles was about 40-100 nm. Main phase of the particle was gradually changed from ZnO (pH8.0) to Cd(OH)2 (pH9.5). Detailed analysis of the synthesized precursor was clearly demonstrated that these have the crystalline structure and each metal element was co-existed in one particle. Therefore, it could be concluded that core-shell type or uniform type precursor was successfully synthesized. Core-shell type ZnS-CdS stratified photocatalyst could be successfully synthesized by sulfurization for 1h, and it shows the high photocatalytic activity under visible light irradiation.

scholarly journals Dye-sensitized Pt@TiO2 core–shell nanostructures for the efficient photocatalytic generation of hydrogen

2014 ◽  
Vol 5 ◽  
pp. 360-364 ◽  
Author(s):  
Jun Fang ◽  
Lisha Yin ◽  
Shaowen Cao ◽  
Yusen Liao ◽  
Can Xue
Keyword(s):  
Photocatalytic Activity ◽  
High Photocatalytic Activity ◽  
Shell Structures ◽  
Core Shell ◽  
Synergic Effect ◽  
Proton Reduction ◽  
Dye Sensitization ◽  
Dye Sensitized ◽  
Shell Nanostructures ◽  
Photogenerated Electrons

Pt@TiO2 core–shell nanostructures were prepared through a hydrothermal method. The dye-sensitization of these Pt@TiO2 core–shell structures allows for a high photocatalytic activity for the generation of hydrogen from proton reduction under visible-light irradiation. When the dyes and TiO2 were co-excited through the combination of two irradiation beams with different wavelengths, a synergic effect was observed, which led to a greatly enhanced H2 generation yield. This is attributed to the rational spatial distribution of the three components (dye, TiO2, Pt), and the vectored transport of photogenerated electrons from the dye to the Pt particles via the TiO2 particle bridge.

scholarly journals High Photocatalytic Activity of Fe3O4-SiO2-TiO2Functional Particles with Core-Shell Structure

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Chenyang Xue ◽  
Qiang Zhang ◽  
Junyang Li ◽  
Xiujian Chou ◽  
Wendong Zhang ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Photocatalytic Activity ◽  
Shell Structure ◽  
Sol Gel ◽  
High Photocatalytic Activity ◽  
Core Shell ◽  
Large Area ◽  
Uniform Size ◽  
Functional Nanoparticles ◽  
Core Shell Structure

This paper describes a novel method of synthesizing Fe3O4-SiO2-TiO2functional nanoparticles with the core-shell structure. The Fe3O4cores which were mainly superparamagnetic were synthesized through a novel carbon reduction method. The Fe3O4cores were then modified with SiO2and finally encapsulated with TiO2by the sol-gel method. The results of characterizations showed that the encapsulated 700 nm Fe3O4-SiO2-TiO2particles have a relatively uniform size distribution, an anatase TiO2shell, and suitable magnetic properties for allowing collection in a magnetic field. These magnetic properties, large area, relative high saturation intensity, and low retentive magnetism make the particles have high dispersibility in suspension and yet enable them to be recovered well using magnetic fields. The functionality of these particles was tested by measuring the photocatalytic activity of the decolouring of methyl orange (MO) and methylene blue (MB) under ultraviolet light and sunlight. The results showed that the introduction of the Fe3O4-SiO2-TiO2functional nanoparticles significantly increased the decoloration rate so that an MO solution at a concentration of 10 mg/L could be decoloured completely within 180 minutes. The particles were recovered after utilization, washing, and drying and the primary recovery ratio was 87.5%.

scholarly journals Synthesis and Photocatalytic Activity of Magnetically Recoverable Core-Shell Nanoparticles

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Zhen Peng ◽  
Hua Tang ◽  
Yao Tang ◽  
Ke Fu Yao ◽  
Hong Hong Shao
Keyword(s):  
Photocatalytic Activity ◽  
High Efficiency ◽  
Sol Gel ◽  
High Photocatalytic Activity ◽  
Core Shell ◽  
Oily Wastewater ◽  
Strong Response ◽  
Shell Nanoparticles ◽  
Oil Concentration ◽  
Core Shell Nanoparticles

TiO2/SiO2/Fe3O4(TSF) core-shell nanoparticles with good photocatalytic activity that are capable of fast magnetic separation have been successfully prepared by chemical coprecipitation and two-step sol-gel process. The as-prepared TSF nanoparticles were calcined at high temperature in order to transform the amorphous titanium dioxide into a photoactive crystalline phase. The calcined nanoparticles are composed of a Fe3O4core with a strong response to external magnetic fields, a SiO2intermediary layer, and a TiO2outshell. Vibration sample magnetometer (VSM) analysis confirms the superparamagnetism of calcined nanoparticles, which can enhance the recoverable properties of the novel photocatalyst. When the TiO2/SiO2/Fe3O4core-shell nanoparticles are added to the crude oily wastewater, they exhibit high photocatalytic activity in the degradation of crude oily wastewater. The oil concentration could be reduced to lower than 30 ppm within 20 minutes for the case of initial oil concentration less than 350 ppm. It has been found that the TSF nanoparticles could be easily separated from the wastewater and withdrawn by using an external magnetic field. The recovered TSF nanoparticles possess high efficiency in the degradation of crude oily wastewater even after three times successive reuse. The present results indicate that TSF core-shell nanoparticles possess great application perspectives in the degradation of crude oily wastewater.

scholarly journals Photocatalytic Degradation of Sulfamethoxazole, Nitenpyram and Tetracycline by Composites of Core Shell g-C3N4@ZnO, and ZnO Defects in Aqueous Phase

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2609
Author(s):  
Godfred Kwesi Teye ◽  
Jingyu Huang ◽  
Yi Li ◽  
Ke Li ◽  
Lei Chen ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Photocatalytic Activity ◽  
Light Absorption ◽  
Charge Separation ◽  
Absorption Efficiency ◽  
High Photocatalytic Activity ◽  
High Load ◽  
Core Shell ◽  
Visible Light Absorption ◽  
Load Separation

The synthesis of photocatalysts with high charge separation and transfer efficiency are of immense significance in the process of using photocatalysis technology for wastewater treatment. In this study core shell g-C3N4@ZnO, and ZnO defects photocatalysts presented an improved morphology in its characterization using techniques such as SEM, DRS, PL, MS, EIS, and XRD, and enhanced photodegradation of sulfamethoxazole, Nitenpyram and Tetracycline. Different composites were obtained as confirmed by the various characterization techniques studied, including core shell g-C3N4@ZnO, and ZnO defects photocatalyst. The synthesized photocatalysts showed high visible light absorption efficiency within a range of ~655 to 420 nm. Core shell g-C3N4@ZnO, and ZnO defects photocatalysts demonstrated high photocatalytic activity ascribed to high load separation and transition as shown in PL, Photocurrent reaction and EIS. It is understandable that core shell g-C3N4@ZnO, and ZnO defects photocatalysts have been confirmed to be one of the ultimate promising entrants for photocatalyst scheming.

BiOCl/SnS2 Core-Shell Photocatalyst for the Degradation of Organic Pollutants

NANO ◽  
2016 ◽  
Vol 11 (08) ◽  
pp. 1650087 ◽  
Author(s):  
Hui Meng ◽  
Tingting Wang ◽  
Hongbin Chen ◽  
Yizhu Liu ◽  
Xiang Yu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Method ◽  
Organic Pollutants ◽  
Rhodamine B ◽  
High Performance ◽  
High Photocatalytic Activity ◽  
Cycle Life ◽  
Core Shell ◽  
Electron Hole ◽  
Fast Separation

BiOCl/SnS2 core-shell heterojunction is prepared by a facile and economic hydrothermal method. The obtained BiOCl/SnS2 heterojunction displays high photocatalytic activity in the degradation of Rhodamine B (RhB). The high performance is explained by the fast separation of the photoinduced electron–hole pairs promoted by the heterojunction. The cycle life of the heterojunction is also improved compared with individual BiOCl or SnS2.

THE PREPARATION AND APPLICATION OF MAGNETIC NANOPARTICLES WITH CORE-SHELL STRUCTURE

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1523-1528 ◽  
Author(s):  
ZHEN PENG ◽  
KE-FU YAO ◽  
ZHENHUA LIAO ◽  
WENPENG FU
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Magnetic Nanoparticles ◽  
Photocatalytic Degradation ◽  
Photocatalytic Performance ◽  
High Photocatalytic Activity ◽  
Core Shell ◽  
Economic Consideration ◽  
Wastewater Purification ◽  
The Cost

It is well-known that TiO 2 nanoparticles are highly efficient photocatalysts in decomposing organic substance in wastewater, especially when they are used in suspension state. However, if TiO 2 nanoparticles cannot be withdrawn and reused, it is difficult to apply them in purification of wastewater due to the economic consideration. In present work, TiO 2/ SiO 2/ Fe 3 O 4 core-shell magnetic nanoparticles, constituted by Fe 3 O 4 core, SiO 2 intermediary layer and the TiO 2 out-shell, have been prepared and applied in photocatalytic degradation of a modulated methylene blue containing water. The results indicate that the as-prepared TiO 2/ SiO 2/ Fe 3 O 4 nanoparticles possess high photocatalytic activity and the methylene blue in wastewater can be degraded quickly. Through comparing with the photocatalytic performance of the famous commercial P 25 TiO 2 nanoparticles in the same reaction condition, it has been found that as-prepared TiO 2/ SiO 2/ Fe 3 O 4 nanoparticles exhibit similar photocatalytic activity to commercial P 25 TiO 2 nanoparticles in the photocatalytic degradation of methylene blue containing water. But the TiO 2/ SiO 2/ Fe 3 O 4 nanoparticles used in suspension state can be simply recovered from the liquid by using a magnet or a magnetic field. So the cost of wastewater purification by photocatalytic degradation with TiO 2/ SiO 2/ Fe 3 O 4 nanoparticles can be significantly reduced through reuse of the photocatalyst. It implies that TiO 2/ SiO 2/ Fe 3 O 4 nanoparticles possess the potential for industrial application.

Copper Phthalocyanine/Fe3O4 Nanocomposite for Photocatalytic Degradation of Methylene Blue under Visible Irradiation

2011 ◽  
Vol 239-242 ◽  
pp. 2183-2186
Author(s):  
Kun Wang ◽  
Li Na Dai ◽  
He Nan Li ◽  
Chang Ju ◽  
Wei Liu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Hydrogen Peroxide ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Copper Phthalocyanine ◽  
High Photocatalytic Activity ◽  
Nano Composites ◽  
Core Shell ◽  
Visible Irradiation ◽  
Magnetically Separable

Magnetically separable copper phthalocyanine/Fe3O4(CuPc/Fe3O4) core–shell nano- composites were prepared by an organic-inorganic complexation technique, which could effectively catalyze photodegradation of the model pollutant methylene blue (MB), using hydrogen peroxide as oxidant under visible light irradiation. Moreover, the as-prepared functional nanocomposites could be easily separated from the photodegradation system by using an external magnetic field, which still kept high photocatalytic activity after 5 time’s continual utilization.

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