Different doping of biomass-derived carbon dots effect on the degradation efficiency of methylene blue

2021 ◽  
Author(s):  
yu han ◽  
yuan peng ◽  
Hongyan Zhang
Keyword(s):  
Methylene Blue ◽  
Carbon Dots ◽  
Degradation Efficiency

Catalytic degradation of methylene blue using iron and nitrogen-containing carbon dots as Fenton-like catalysts

2021 ◽  
Author(s):  
Sabrina A. Beker ◽  
Leadin S. Khudur ◽  
Ivan S Cole ◽  
Andy Ball
Keyword(s):  
Methylene Blue ◽  
Carbon Dots ◽  
Catalytic Degradation ◽  
Environmental Issue ◽  
Pollution Sources ◽  
Wastewater Pollution

Wastewater pollution is an existing and serious environmental issue. One of the main wastewater pollution sources is from the dyestuff industries and its discharge poses a serious threat to the...

Treatment of pesticide rinsate towards reuse by photosensitized Fenton-like process

2010 ◽  
Vol 62 (6) ◽  
pp. 1424-1431 ◽  
Author(s):  
W. S. Kuo ◽  
Y. Y. Ho
Keyword(s):  
Molecular Structure ◽  
Molecular Weight ◽  
Methylene Blue ◽  
Hydroxyl Radicals ◽  
Catalytic Effect ◽  
Degradation Efficiency ◽  
Alizarin Red S ◽  
Alizarin Red ◽  
Complete Destruction ◽  
Quinone Structure

A Fenton-like process with combination of dye has been used to enhance the treatment of carbofuran (2,3-dihydro-2,2-dimethylbenzofuran -7-yl methylcarbamate) pesticide rinsate. Results showed that as compared to Fenton-like process, this photosensitization Fenton-like process improved the degradation efficiency of carbofuran rinsate significantly. Among the conditions studied, the optimum dosage for the complete destruction of carbofuran molecular structure was found under a [H2O2]0/[Fe3 + ]0 ratio of 30–35 and a [Dye]0/[Fe3 + ]0 ratio of 2%, respectively, after an irradiance of 500 W/m2 for 20 min. As a result, the COD degradation efficiency of rinsate could be promoted from 37.1 to 61.2% and 66.0% by an addition of methylene blue (MB) and alizarin red S (ARS), respectively. Nevertheless, ARS showed a much more effective acceleration effect on the mineralization and microtoxicity reduction of carbofuran than MB. A mineralization efficiency of 57.2% and a microtoxicity reduction of 90% could be achieved with the addition of ARS. Because of its quinone structure unit, the dye ARS could play a role like hydroquinone to recycle Fe2 +  from Fe3 + , resulting in one more catalytic effect on the reduction of Fe3 +  and thus the mineralization and microtoxicity reduction of carbofuran was greatly promoted in the presence of ARS. In addition, it was found that carbofuran molecules could be decomposed quickly to lower-molecular-weight intermediates and even mineralized by attacking of hydroxyl radicals. Carbofuran was found to be decomposed to carbofuran phenol, 3-oxo carbofuran phenol, and 3-hydroxyl carbofuran phenol initially, and then further be degraded to smaller molecules, such as NO3−, CH3COOH, (COOH)2 and CO2. Accordingly, it was believed that the Fenton-like process along with the aid of a photosensitizer, such as ARS, under an appropriate ratio could be a feasible and potential technology for the treatment of pesticide rinsate.

Synthesis and characterization of anatase TiO2 nanolayer coating on Ni–Cu–Zn ferrite powders for magnetic photocatalyst

2010 ◽  
Vol 25 (1) ◽  
pp. 134-140 ◽  
Author(s):  
Yen-Pei Fu ◽  
Wen-Ku Chang ◽  
Hsin-Chao Wang ◽  
Chung-Wen Liu ◽  
Cheng-Hsiung Lin
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Degradation ◽  
Sol Gel ◽  
Titanium Isopropoxide ◽  
Degradation Efficiency ◽  
Ferrite Powder ◽  
Order Kinetic ◽  
Magnetic Photocatalyst ◽  
The Core ◽  
Zn Ferrite

In the current research, we successfully prepared TiO2/Ni–Cu–Zn ferrite composite powder for magnetic photocatalyst. The core Ni–Cu–Zn ferrite powder was synthesized using the steel pickling liquor and the waste solution of electroplating as the starting materials. The shell TiO2 nanocrystal was prepared by sol-gel hydrolysis precipitation of titanium isopropoxide [Ti(OC3H7)4] on the Ni–Cu–Zn ferrite powder followed by heat treatment. From transmission electron microscopy (TEM) image, the thickness of the titania shell was found to be approximately 5 nm. The core of Ni–Cu–Zn ferrite is spherical or elliptical shape, and the particle size of the core is in the range of 70–110 nm. The magnetic Ni–Cu–Zn ferrite nanopowder is uniformly encapsulated in a titania layer forming core-shell structure of TiO2/Ni–Cu–Zn ferrite powder. The degradation efficiency for methylene blue (MB) increases with magnetic photocatalyst (TiO2/Ni–Cu–Zn ferrite powder) content. When the magnetic photocatalyst content is 0.40 g in 150 mL of MB, the photocatalytic activity reached the largest value. With a further increase in the content of magnetic photocatalyst, the degradation efficiency slightly decreased. This occurs because the ultraviolet (UV) illumination is covered by catalysts, which were suspended in the methylene blue solution and resulted in the inhibition in the photocatalytic reaction. The photocatalytic degradation result for the relationship between MB concentration and illumination revealed a pseudo first-order kinetic model of the degradation with the limiting rate constant of 1.717 mg/L·min and equilibrium adsorption constant 0.0627 L/mg. Furthermore, the Langmuir–Hinshelwood model can be used to describe the degradation reaction, which suggests that the rate-determining step is surface reaction rather than adsorption is in photocatalytic degradation.

scholarly journals Preparation and properties of CA/ATP-g-CDs gel fibers for simultaneous detection and adsorption of methylene blue

RSC Advances ◽  
2018 ◽  
Vol 8 (40) ◽  
pp. 22577-22582 ◽  
Author(s):  
Fengying Dai ◽  
Mengjuan Wen ◽  
Jinna Wang ◽  
Wenzhe Jiang ◽  
Xuetao Tian ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Carbon Dots ◽  
Calcium Alginate ◽  
Simultaneous Detection ◽  
Absorbent Material

To detect and adsorb methylene blue (MB) from wastewater simultaneously, a solid fluorescent and absorbent material was designed by immobilizing attapulgite (ATP) on calcium alginate (CA) and reacting with carbon dots (CDs), then the CA/ATP-g-CDs gel fibers were prepared.

scholarly journals Enhanced photocatalytic and biological observations of green synthesized AC, AC/Ag and AC/Ag/TiO2 nanocomposites

2021 ◽  
Author(s):  
M AMALANATHAN ◽  
C. Parvathiraja ◽  
Asma A. Alothman ◽  
Saikh M. Wabaidur ◽  
Mohammad Ataul Islam
Keyword(s):  
Methylene Blue ◽  
Antibacterial Activity ◽  
Activated Carbon ◽  
Electron Microscope ◽  
Active Sites ◽  
Waste Water Treatment ◽  
Degradation Efficiency ◽  
Morphological Properties ◽  
X Ray ◽  
Flower Extract

Abstract In this study, AC/Ag/TiO2 nanocomposite was successfully synthesized by hydrothermal method using jasmine flower extract. The reactions of reduction, stabilization and capping was executed from the biomolecules of jasmine flower extract. The decoration of activated carbon and noble metal to the metal oxide enhanced the properties in all ways. As the modified structural, optical and morphological properties of as prepared nanocomposite was characterized using various techniques such as, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV-Visible spectroscopy, Scanning electron microscope (SEM) with Energy dispersive X-ray spectroscopy (EDX), and Transmission electron microscope (TEM). The photocatalytic activities under sunlight were evaluated by the degradation of methylene blue (MB). Antibacterial activity was tested against E-coli and S. aureus. The characterization results show that AC/Ag/TiO2 nanocomposite is crystalline, needle like morphology and highly optically active catalyst. The investigated AC/Ag/TiO2 nanocomposite shows 96% maximum degradation efficiency at the end of 120 minutes undervisible light irradiation. The degradation efficiency and antibacterial activity is readily higher than that of commercial TiO2. The plasmonic support to the activated carbon and titanium nanoparticles creates large surface area, active sites and accelerated the free radical generation. These characteristics demonstrated that the prepared AC/Ag/TiO2 nanocomposite material is highly suitable for the decomposition of methylene blue and waste water treatment.

scholarly journals Microwave Combustion Synthesis, Structural and Morphological Properties of Mg-doped CoFe2O4 Nano-Magnetic Photocatalyst

2019 ◽  
Vol 8 (12S) ◽  
pp. 1072-1075
Keyword(s):  
Methylene Blue ◽  
Degradation Efficiency ◽  
Morphological Properties ◽  
Optimal Conditions ◽  
Magnetic Photocatalyst ◽  
Microwave Assisted ◽  
Microwave Combustion ◽  
Nano Catalyst ◽  
Microwave Assisted Method ◽  
Mg Doped

In the present study, pure and Mg-doped CoFe2O4 nano-magnetic photocatalyst was rapidly prepared based on a microwave-assisted method. Magnetic nano-catalyst are potent heterogeneous photocatalysts for degradation of methylene blue (MB) and promising alternatives to conventional catalysts used in wastewater treatments. Powder XRD, FTIR, HRSEM, EDS, and VSM were performed to identify the structure of Mg-doped CoFe2O4 . The optimal conditions for maximum degradation efficiency were confirmed. The degradation efficiency was also reported to be 87.85% under optimal conditions. Finally, nano-magnetic photocatalyst could be reused for six further runs without remarkable changes in catalytic efficiencies; after six runs, adequate reusability and chemical stability were observed

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