Reusable hybride CoFe2O4-ZnO hollow nanosphere photocatalysts

2012 ◽  
Vol 1406 ◽  
Author(s):  
A. Wilson ◽  
S. R. Mishra ◽  
B. K. Rai ◽  
R.K. Gupta ◽  
K. Ghosh
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Shell Thickness ◽  
Hybrid Structure ◽  
Core Shell ◽  
Magnetic Composite ◽  
Hollow Nanosphere ◽  
Carbon Nanospheres ◽  
Good Repeatability ◽  
Magnetically Separable

AbstractMagnetically separable and reusable core-shell CoFe2O4-ZnO photocatalyst nanospheres were prepared via hydrothermal synthesis technique using glucose derived carbon nanospheres as template. The morphology and phase of core-shell hybrid structure of CoFe2O4-ZnO was assessed via TEM, and XRD. The UV-vis photocatalytic activity of the composite was assessed via measuring the degradation rate of modeled pollutant methylene blue in water. The magnetic composite showed high UV photocatalytic activity for the degradation of methylene blue. The photocatalytic activity was found to be ZnO shell thickness dependent. Thicker ZnO shells lead to higher rate of photocatalytic activity. Hybrid nanospheres recovered using external magnetic field demonstrated good repeatability of photocatalytic activity. These results promise the reusability of hybrid nanospheres for photocatalytic activity.

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.

Preparation of magnetically separable and recyclable carbon dots/NiCo2O4 composites with enhanced photocatalytic activity for the degradation of tetracycline under visible light

2018 ◽  
Vol 5 (6) ◽  
pp. 1438-1444 ◽  
Author(s):  
Jinhui Jiang ◽  
Weilong Shi ◽  
Feng Guo ◽  
Songliu Yuan
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Carbon Dots ◽  
Magnetic Composite ◽  
Composite Photocatalysts ◽  
One Step ◽  
Magnetically Separable ◽  
Calcination Method

CDs/NiCo2O4 magnetic composite photocatalysts with enhanced photocatalytic activity were fabricated through a one-step calcination method.

scholarly journals Shell thickness dependent photocatalytic activity of TiO2/ZnS core-shell nanorod arrays

2020 ◽  
Vol 6 (12) ◽  
pp. 1250b3
Author(s):  
Xiuyan Li ◽  
Zhu Shi ◽  
Jiani Liu ◽  
Jian Wang
Keyword(s):  
Photocatalytic Activity ◽  
Shell Thickness ◽  
Core Shell ◽  
Nanorod Arrays

Enhanced visible-light-driven photocatalytic activity of Au@Ag core–shell bimetallic nanoparticles immobilized on electrospun TiO2 nanofibers for degradation of organic compounds

2017 ◽  
Vol 7 (3) ◽  
pp. 570-580 ◽  
Author(s):  
Mrinmoy Misra ◽  
Narendra Singh ◽  
Raju Kumar Gupta
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Organic Compounds ◽  
Shell Thickness ◽  
Bimetallic Nanoparticles ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Tio2 Nanofibers ◽  
Visible Light Driven ◽  
Core Shell Nanoparticles

In this work, Au@Ag core–shell nanoparticles (NPs) with variable Ag shell thickness were synthesized and immobilized on TiO2 nanofibers (TNF).

Synthesis of core–shell ZIF-67@Co-MOF-74 catalyst with controllable shell thickness and enhanced photocatalytic activity for visible light-driven water oxidation

CrystEngComm ◽  
2018 ◽  
Vol 20 (47) ◽  
pp. 7659-7665 ◽  
Author(s):  
Changyan Guo ◽  
Jia Guo ◽  
Yonghong Zhang ◽  
Di Wang ◽  
Li Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Water Oxidation ◽  
Ligand Exchange ◽  
Shell Thickness ◽  
Photocatalytic Properties ◽  
Core Shell ◽  
Exchange Method ◽  
Visible Light Driven

Core–shell ZIF-67@Co-MOF-74 catalysts with improved photocatalytic properties were synthesized via the ligand exchange method.

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.

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