scholarly journals Selective Adsorption and Photocatalytic Degradation of Dyes Using Polyoxometalate Hybrid Supported on Magnetic Activated Carbon Nanoparticles under Sunlight, Visible, and UV Irradiation

2017 ◽  
Vol 2017 ◽  
pp. 1-15 ◽  
Author(s):  
Mehdi Taghdiri
Keyword(s):  
Activated Carbon ◽  
Photocatalytic Degradation ◽  
Uv Irradiation ◽  
Selective Adsorption ◽  
Thermal Analyses ◽  
Dye Adsorption ◽  
Oh Radicals ◽  
Direct Oxidation ◽  
Magnetic Activated Carbon ◽  
Degradation Of Dyes

In this study, magnetic activated carbon (MAC) nanoparticles were coated with an organic hybrid of silicotungstic acid that makes MAC suitable for adsorption and photocatalytic degradation of dyes. The prepared composite was characterized by Fourier transform infrared spectroscopy, powder X-ray diffraction, thermal analyses, scanning electron microscopy, vibrating sample magnetometer, and N2 adsorption-desorption isotherms. Dye adsorption and photocatalytic properties of composite were examined by studying the decolorization of model dyes methylene blue (MB), methyl orange (MO), rhodamine B (RhB), and their mixture solutions. The results show that the composite can selectively adsorb MB molecules from binary mixtures of MB/MO or MB/RhB, and its adsorption capacity is enhanced as compared with the MAC. The composite is also, unlike MAC, a good photocatalyst in the degradation of dyes under sunlight, visible, and UV irradiation and can be separated by magnet, recovered and reused. Removal is via combination of adsorption and then photocatalytic degradation through direct oxidation by composite or indirect oxidation by •OH radicals. While the sunlight is not able to degrade alone MO and RhB solution in the presence of composite, it degrades the MO and RhB mixed with MB solution.

scholarly journals Preparation of TiO2-Poly(3-Chloro-2-Hydroxypropyl Methacrylate) Nanocomposite for Selective Adsorption and Degradation of Dyes

Technologies ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 92 ◽  
Author(s):  
M. Hossan ◽  
Bungo Ochiai
Keyword(s):  
Uv Irradiation ◽  
Selective Adsorption ◽  
Industrial Effluents ◽  
Cationic Dyes ◽  
Adsorption Efficiency ◽  
Anionic Dyes ◽  
Propyl Methacrylate ◽  
Accelerated Degradation ◽  
Hydroxypropyl Methacrylate ◽  
Degradation Of Dyes

We report a new nanocomposite TiO2-poly(3-chloro-2-hydroxypropyl methacrylate) (TiO2-PCHPMA) for selective adsorption/degradation of cationic dyes and degradation of anionic dyes. TiO2-PCHPMA was prepared by free radical polymerization of CHPMA in the presence of TiO2 modified with 3-(trimethoxysilyl)propyl methacrylate. TiO2-PCHPMA adsorbed cationic methylene blue (MB), but did not adsorb anionic methyl orange (MO) in their aqueous solutions. The adsorption efficiency for MB reached 99% within 5 min at 28 °C, and adsorbed MB could be recycled in 96% efficiency. The adsorption accelerated degradation of MB under UV irradiation. The degradation of anionic MO proceeded completely with TiO2-PCHPMA under UV irradiation, and the efficiency was not affected by the PCHPMA layer. TiO2-PCHPMA is potentially applicable as a material capable of selective removal and recovery of cationic dyes, and degradation of other dyes from industrial effluents.

scholarly journals Rapid Photocatalytic Degradation of Methylene Blue under High Photon Flux UV Irradiation: Characteristics and Comparison with Routine Low Photon Flux

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Qian Zhang ◽  
Chaolin Li ◽  
Ting Li
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Degradation ◽  
Uv Irradiation ◽  
Irradiation Time ◽  
Photon Flux ◽  
Photocatalytic Process ◽  
Toc Removal ◽  
High Photon Flux ◽  
Degradation Of Dyes ◽  
Photonic Efficiency

This study examined the photocatalytic degradation efficiency under high UV photon flux (intensity normalized by photon energy) irradiation; the incident UV photon flux was einstein   made by a super high-intensity UV apparatus. A comparative study between high photon flux photocatalytic process and routine low photon flux photocatalytic process for methylene blue degradation has been made in aqueous solution. The experimental results showed that under the best conditions of high UV photocatalytic reaction 99% decolorization and 95% TOC removal of 20 mg L−1methylene blue could be achieved in 30 s and 120 s of UV irradiation time, respectively. To the best of our knowledge, photocatalytic decolorization and photocatalytic degradation of dyes in such a short time has not been reported. Aiming at the low photonic efficiency in high photon flux photocatalytic process, we found that reducing the density of excited electron-hole appropriately could improve initial apparent photonic efficiency effectively. The TOC experiments under high UV photon flux showed a faster mineralization rate and a different mineralization process compared to that under low UV photon flux.

Photocatalytic degradation of dyes on a magnetically separated photocatalyst under visible and UV irradiation

Chemosphere ◽  
2001 ◽  
Vol 44 (5) ◽  
pp. 1159-1168 ◽  
Author(s):  
Feng Chen ◽  
Yinde Xie ◽  
Jincai Zhao ◽  
Gongxuan Lu
Keyword(s):  
Photocatalytic Degradation ◽  
Uv Irradiation ◽  
Degradation Of Dyes

scholarly journals Fabrication of Magnetic Nanoparticles Integrated Carbon Matrix from Chrysopogon zizanioides Roots: Strong Dye Adsorption and Persulphate Assisted Photodegradation

2021 ◽  
Vol 34 (1) ◽  
pp. 201-208
Author(s):  
A.P. Mary Sri Archana ◽  
A. Edwin Vasu
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Magnetic Nanoparticles ◽  
Rhodamine B ◽  
Photocatalytic Oxidation ◽  
Surface Acidity ◽  
Dye Adsorption ◽  
Potassium Persulphate ◽  
Magnetic Activated Carbon ◽  
Chrysopogon Zizanioides

Activated carbon with magnetic nanoparticles was prepared from the roots of Chrysopogon zizanioides by impregnating the biomass with Fe3+ followed by carbonization in a muffle furnace. To assist the carbonization process, Zn2+ ions were also taken along with ferric ions during impregnation. The pHZPC, density of surface functional groups, surface acidity constants and advanced characterizations like FT-IR, N2 adsorption-desorption isotherms, SEM with EDAX, DLS, XRD and VSM analysis were carried out. The adsorption and natural sunlight induced photooxidation of two cationic dyes, namely, methylene blue and rhodamine B in presence of potassium persulphate were studied by varying parameters like time, dye concentration, pH of the dye solution, amount of magnetic activated carbon and concentration of persulphate ions. The adsorption capacities of methylene blue and rhodamine B were found to be 5.97 and 0.96 mg/g, respectively. Photocatalytic oxidation of the dyes was very rapid in the presence of persulphate with the observed rate constants being 5.3 × 10–3 min–1 for methylene blue and 13.0 × 10–3 min–1 for rhodamine B. The magnetic activated carbon is found to be effective even after five successive degradation experiments.

Photocatalytic degradation of salicylic acid with magnetic activated carbon-supported F-N codoped TiO2 under visible light

Vacuum ◽  
2017 ◽  
Vol 141 ◽  
pp. 157-165 ◽  
Author(s):  
Rongrong Ma ◽  
Xuejiang Wang ◽  
Jiayu Huang ◽  
Jingke Song ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Activated Carbon ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Magnetic Activated Carbon ◽  
Codoped Tio2
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