Microwave-assisted synthesis of monoclinic–tetragonal BiVO4 heterojunctions with enhanced visible-light-driven photocatalytic degradation of tetracycline

RSC Advances ◽  
2015 ◽  
Vol 5 (110) ◽  
pp. 90255-90264 ◽  
Author(s):  
Ming Yan ◽  
Yan Yan ◽  
Yilin Wu ◽  
Weidong Shi ◽  
Yinqun Hua
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Microwave Assisted Synthesis ◽  
Crystalline Phases ◽  
Microwave Assisted ◽  
M Phase ◽  
Visible Light Driven ◽  
T Phase ◽  
Microwave Assisted Method

In this study, BiVO4 photocatalysts of different crystalline phases (monoclinic scheelite (M-phase), tetragonal zircon (T-phase) and monoclinic–tetragonal heterojunction (M–T)) have been successfully synthesized via a facile microwave-assisted method.

scholarly journals Synthesis of Porous Octahedral ZnO/CuO Composites from Zn/Cu-Based MOF-199 and Their Applications in Visible-Light-Driven Photocatalytic Degradation of Dyes

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Tran Thanh Minh ◽  
Nguyen Thi Thanh Tu ◽  
Tran Thi Van Thi ◽  
Le Thi Hoa ◽  
Hoang Thai Long ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Metal Organic Framework ◽  
Phenol Red ◽  
Microwave Assisted ◽  
Degradation Reactions ◽  
Degradation Of Dyes ◽  
Visible Light Driven ◽  
Metal Organic ◽  
Microwave Assisted Method

In the present paper, a porous octahedral (ZnO/CuO) composite is synthesized from zinc/copper-based metal-organic framework-199, and its applications in visible-light-driven photocatalytic degradation of dyes are demonstrated. The precursors of Zn-BTC, Cu-BTC, and Zn/Cu-BTC (BTC: benzene-1,3,5-tricarboxylate) were synthesized using a microwave-assisted method. Benzene-1,3,5-tricarboxylate acts as a sacrificial template and was removed from the precursors via thermal decomposition to form CuO, ZnO, and ZnO/CuO. ZnO/CuO with a large specific surface area of 32.5 m2·g–1 is composed of porous octahedral particles of 5–10 μm in diameter. Methylene blue (MB) was utilized as the dye model for photocatalytic degradation reactions. The porous octahedral ZnO/CuO exhibits superior visible-light-driven photocatalytic degradation of MB compared with single CuO or ZnO. The kinetic model of photocatalytic degradation was proposed as 1/KL×lnC+C=−krt+1/KL×lnCe+Ce, where KL is the Langmuir equilibrium constant and Ce is the MB concentration at equilibrium. The model significantly fits the kinetic data. In addition, the acquired catalyst manifests excellent photocatalytic degradation for several other dyes including phenol red, methyl orange, and Congo red.

scholarly journals Surfactant-Free Microwave-Assisted Synthesis of Fe-Doped ZnO Nanostars as Photocatalyst for Degradation of Tropaeolin O in Water under Visible Light

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Tsz-Lung Kwong ◽  
Ka-Fu Yung
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Irradiation Time ◽  
Catalyst Loading ◽  
Orthogonal Experimental Design ◽  
Microwave Assisted Synthesis ◽  
X Ray ◽  
Microwave Assisted ◽  
Vis Spectroscopy ◽  
Doped Zno

Iron-doped zinc oxide nanostar was synthesized by the microwave-assisted surfactant-free hydrolysis method. The as-synthesized Fe-doped ZnO nanostars catalyst was fully characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), powder X-ray diffraction (XRD), and diffuse reflectance UV-vis spectroscopy (UV-DRA). The photocatalytic activity of the photocatalyst was investigated for the photocatalytic degradation of Tropaeolin O under visible light irradiation. It is observed that the doping of Fe ions enhances the absorption of the visible light and thus the photocatalytic degradation rate of Tropaeolin O would increase. Despite the Taguchi orthogonal experimental design method, the photocatalytic conversion could be achieved at 99.8% in the Fe-doped ZnO catalyzed photodegradation reaction under the optimal reaction conditions of catalyst loading (30 mg), temperature (60°C), light distance (0 cm), initial pH (pH = 9), and irradiation time (3 h). The Fe-doped ZnO photocatalyst can also be easily recovered and directly reused for eight cycles with over 70% conversion.

Morphological evolution and visible light driven degradation of tetracycline by Bi3.84W0.16O6.24 nanostructures

RSC Advances ◽  
2015 ◽  
Vol 5 (82) ◽  
pp. 66940-66946 ◽  
Author(s):  
Xinying Li ◽  
Liping Wang ◽  
Weidong Shi ◽  
Chengjie Song ◽  
Dongbo Xu ◽  
...  
Keyword(s):  
Visible Light ◽  
Morphological Evolution ◽  
Microwave Assisted ◽  
Visible Light Driven ◽  
Microwave Assisted Method

In this work, two morphologies of Bi3.84W0.16O6.24 nanostructures, namely the nanobelt (T2) and nanooctahedral structure (T15), were synthesized via a simple, microwave-assisted method.

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