Efficient photocatalytic degradation of methylene blue by using GO/hemin/TiO 2 nanocomposite under visible irradiation

2018 ◽  
Vol 13 (5) ◽  
pp. 646-651 ◽  
Author(s):  
Hongming Shang ◽  
Liang Chen ◽  
Yujie Wang ◽  
Hanyu Liu
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Degradation ◽  
Visible Irradiation

scholarly journals Methylene Blue Photodegradation under Visible Irradiation on Ag-Doped ZnO Thin Films

2020 ◽  
Vol 2020 ◽  
pp. 1-11 ◽  
Author(s):  
William Vallejo ◽  
Alvaro Cantillo ◽  
Carlos Díaz-Uribe
Keyword(s):  
Thin Films ◽  
Methylene Blue ◽  
Raman Spectroscopy ◽  
Photocatalytic Degradation ◽  
Physicochemical Characterization ◽  
Zno Thin Films ◽  
Visible Range ◽  
X Ray ◽  
Visible Irradiation ◽  
Doped Zno

This study synthesized and characterized Ag-doped ZnO thin films. Doped ZnO powders were synthesized using the sol-gel method, and thin films were fabricated using the doctor blade technique. The Ag content was determined by optical emission spectrometers with inductively coupled plasma (ICP plasma). Additionally, X-ray diffraction, Raman spectroscopy, Atomic Force Microscopy (AFM), diffuse reflectance, and X-ray photoelectron spectroscopy (XPS) measurements were used for physicochemical characterization. Finally, the photocatalytic degradation of methylene blue (MB) was studied under visible irradiation in aqueous solution. The Langmuir-Hinshelwood model was used to determine the reaction rate constant of the photocatalytic degradation. The physicochemical characterization showed that the samples were polycrystalline, and the diffraction signals corresponded to the ZnO wurtzite crystalline phase. Raman spectroscopy verified the ZnO doping process. The AFM analysis showed that roughness and grain size were reduced after the doping process. Furthermore, the optical results indicated that the presence of Ag improved the ZnO optical properties in the visible range, and the Ag-doped ZnO thin films had the lowest band gap value (2.95 eV). Finally, the photocatalytic degradation results indicated that the doping process enhanced the photocatalytic activity under visible irradiation, and the Ag-doped ZnO thin films had the highest MB photodegradation value (45.1%), as compared to that of the ZnO thin films (2.7%).

scholarly journals Effect of several commercial rubber as substrates for zinc oxide in the photocatalytic degradation of methylene blue under visible irradiation

2020 ◽  
Vol 14 (9) ◽  
pp. 838-847
Author(s):  
R. Nordin ◽  
N. Latiff ◽  
R. Yusof ◽  
W. I. Nawawi ◽  
M. Z. Salihin ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Zinc Oxide ◽  
Photocatalytic Degradation ◽  
Visible Irradiation

scholarly journals Methylene Blue Photocatalytic Degradation under Visible Irradiation on In2S3 Synthesized by Chemical Bath Deposition

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
William Vallejo ◽  
Carlos Díaz-Uribe ◽  
Kathy Rios
Keyword(s):  
Methylene Blue ◽  
Raman Spectroscopy ◽  
Photocatalytic Degradation ◽  
Chemical Bath Deposition ◽  
Visible Region ◽  
Physicochemical Characterization ◽  
Ion Source ◽  
Electromagnetic Spectrum ◽  
Visible Irradiation ◽  
Diffraction Patterns

In this work, we synthesized In2S3 powder through chemical bath deposition method (CBD) in acid medium; we used thioacetamide as sulphide source and InCl3 as indium ion source. X-ray diffraction, diffuse reflection, and Raman spectroscopy measurements were used for In2S3 powder physicochemical characterization. Optical analysis indicated that In2S3 was active in the visible region of electromagnetic spectrum; it had a band gap of 2.47 eV; the diffraction patterns and Raman spectroscopy suggested that powder had polycrystalline structure. Furthermore, we also studied the adsorption process of methylene blue (MB) on In2S3 powder; adsorption studies indicated that the Langmuir model describes experimental data. Finally, photocatalytic degradation of MB was studied under visible irradiation in aqueous solution; besides, pseudo-first-order model was used to obtain kinetic information about photocatalytic degradation; results indicated that the powder catalyst reduces 26% concentration of MB under visible irradiation.

Influence of anatase and rutile phase in TiO2 upon the photocatalytic degradation of methylene blue under solar irradiation in presence of activated carbon

2014 ◽  
Vol 69 (11) ◽  
pp. 2184-2190 ◽  
Author(s):  
J. Matos ◽  
R. Montaña ◽  
E. Rivero ◽  
A. Escudero ◽  
D. Uzcategui
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Activated Carbon ◽  
Photocatalytic Degradation ◽  
Anatase Phase ◽  
Rutile Phase ◽  
Solar Irradiation ◽  
Exponential Trend ◽  
Visible Irradiation ◽  
Binary Material

The influence of activated carbon (AC) on the photocatalytic activity of different crystalline TiO2 phases was verified in the photocatalytic degradation of methylene blue under UV and solar irradiation. The results showed a volcano trend with a maximum photoactivity for the crystalline phase ratio of anatase:rutile equal to 80:20 both under UV or solar irradiation. By contrast, in presence of AC the photocatalytic activity of the binary materials of TiO2/AC followed an exponential trend, increasing as a function of the increase in anatase proportion in the TiO2 framework. The increase in the photoactivity of the binary material TiO2/AC relative to neat TiO2 was up to 22 and about 17 times higher under UV and visible irradiation, respectively. The present results suggest that AC interacts more efficiently with anatase phase than with rutile phase.

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