Photo-oxidative degradation of the pesticide permethrin catalysed by irradiated TiO2 semiconductor slurries in aqueous media

1992 ◽  
Vol 64 (2) ◽  
pp. 247-254 ◽  
Author(s):  
Hisao Hidaka ◽  
Kayo Nohara ◽  
Jincai Zhao ◽  
Nick Serpone ◽  
Ezio Pelizzetti
Keyword(s):  
Aqueous Media ◽  
Oxidative Degradation

scholarly journals Silica-Supported Co3O4 Nanoparticles as a Recyclable Catalyst for Rapid Degradation of Azodye

2016 ◽  
Vol 11 (3) ◽  
pp. 284 ◽  
Author(s):  
Ali Baghban ◽  
Esmail Doustkhah ◽  
Sadegh Rostamnia ◽  
Khadijeh Ojaghi Aghbash
Keyword(s):  
Silica Nanoparticles ◽  
Aqueous Media ◽  
Oxidative Degradation ◽  
Ammonium Persulfate ◽  
Recyclable Catalyst ◽  
Co3o4 Nanoparticles ◽  
Media Effect ◽  
Rapid Degradation ◽  
Ft Ir ◽  
20 Nm

<p>In this paper, silica nanoparticles with particle size of ~ 10-20 nm were selected as a support for the synthesis of Co<sub>3</sub>O<sub>4</sub> nanoparticles by impregnation of silica nanoparticles in solution of Co(II) in a specific concentrations and then calcination to 800 <sup>o</sup>C. This nanocomposite was then, used as a catalyst for oxidative degradation of methyl orange (MO) with ammonium persulfate in aqueous media. Effect of pH, temperature, contact time, amount of oxidant and catalyst were studied in the presence of manuscript. Scanning electron microscope (SEM), electron dispersive spectroscopy (EDS), FT-IR, and ICP-AES analyses were used for analysis of silica-supported Co<sub>3</sub>O<sub>4</sub> (Co<sub>3</sub>O<sub>4</sub>/SiO<sub>2</sub>). Treating MO with ammonium persulfate in the presence of Co<sub>3</sub>O<sub>4</sub>/SiO<sub>2 </sub>led to complete degradation of MO under the optimized conditions. Also, the catalyst exhibited recyclability at least over 10 consecutive runs. Copyright © 2016 BCREC GROUP. All rights reserved</p><p><em>Received: 12<sup>nd</sup> December 2015; Revised: 27<sup>th</sup> January 2016; Accepted: 27<sup>th</sup> January 2016</em></p><p><strong>How to Cite</strong>: Baghban, A., Doustkhah, E., Rostamnia, S., Aghbash, K.O. (2016). Silica-Supported Co<sub>3</sub>O<sub>4</sub> Nanoparticles as a Recyclable Catalyst for Rapid Degradation of Azodye. <em>Bulletin of Chemical Reaction Engineering &amp; Catalysis</em>, 11 (3): 284-291 (doi:10.9767/bcrec.11.3.568.284-291)</p><p><strong>Permalink/DOI</strong>: <a href="http://doi.org/10.9767/bcrec.11.3.568.284-291">http://doi.org/10.9767/bcrec.11.3.568.284-291</a></p>

Oxidative degradation and mineralization of the phenylurea herbicide fluometuron in aqueous media by the electro-Fenton process

2017 ◽  
Vol 186 ◽  
pp. 197-206 ◽  
Author(s):  
Pape Abdoulaye Diaw ◽  
Nihal Oturan ◽  
Mame Diabou Gaye Seye ◽  
Atanasse Coly ◽  
Alponse Tine ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Oxidative Degradation ◽  
Fenton Process ◽  
Phenylurea Herbicide

scholarly journals Contribution of copper binding to the inhibition of lipid oxidation by plasmalogen phospholipids

1999 ◽  
Vol 340 (2) ◽  
pp. 377-383 ◽  
Author(s):  
Daniela HAHNEL ◽  
Thomas HUBER ◽  
Volker KURZE ◽  
Klaus BEYER ◽  
Bernd ENGELMANN
Keyword(s):  
Lipid Oxidation ◽  
Copper Ions ◽  
Aqueous Media ◽  
Oxidative Degradation ◽  
Direct Interaction ◽  
Molar Ratio ◽  
Protective Effects ◽  
Copper Binding ◽  
Enol Ether

The role of plasmalogen phospholipids for copper-induced lipid oxidation was evaluated. Using 1H-NMR we observed that the copper (CuSO4)-promoted oxidative degradation of polyunsaturated fatty acids in micellar solution was dose-dependently attenuated by the plasmalogen lysoplasmenylethanolamine from bovine brain (lysoBP-PtdEtn). This was due to a direct interaction of copper ions with the plasmalogen-specific enol ether double bond. The enol ether methine 1H signal decreased on the addition of copper, saturation being reached at a molar ratio of lysoBP-PtdEtn to copper of 1:1. The original 1H signal was recovered almost completely after the addition of EDTA. Enrichment of micelles and low-density lipoproteins (LDLs) with plasmalogen phospholipids led to a decrease in the Cu(II) concentration in the aqueous media. After loading of LDLs in vitro with BP-PtdEtn, the LDL-dependent formation of Cu(I) was decreased, in particular in particles experimentally supplemented with α-tocopherol. The suppression of copper-promoted lipid oxidation that was observed in the presence of plasmalogen phospholipids plus α-tocopherol was greater than the sum of the protective effects elicited by the two substances alone. In conclusion, the formation of a complex between copper ions and the plasmalogens accounts partly for their inhibition of copper-induced lipid oxidation.

Activation of Peroxymonosulfate by CuNi@C Derived from Metal–Organic Frameworks Precursor

2018 ◽  
Vol 71 (11) ◽  
pp. 874 ◽  
Author(s):  
Xue Huang ◽  
Jing Zhang ◽  
Xiao Zhang ◽  
Qing-Ping Wu ◽  
Chun-Hui Yan
Keyword(s):  
Photoelectron Spectroscopy ◽  
Metallic Copper ◽  
Metal Organic Frameworks ◽  
Aqueous Media ◽  
Oxidative Degradation ◽  
Acid Orange 7 ◽  
X Ray Diffraction ◽  
X Ray ◽  
Initial Ph ◽  
Metal Organic

Calcined Cu-based metal–organic frameworks impregnated with nickel nitrate catalysts (CuNi@C) were synthesised. X-Ray diffraction, scanning electronic microscopy, energy dispersive X-ray spectrometry, and X-ray photoelectron spectroscopy techniques were applied for the characterisation of the synthesised catalyst, which revealed an octahedral particle shape, rough surface, and metallic copper (Cu, CuO) and nickel (Ni, NiO) particles. CuNi@C was fabricated as a novel peroxymonosulfate (PMS) activator for the oxidative degradation of Acid Orange 7 (AO7) in aqueous media. Results showed that the CuNi@C/PMS system can efficiently degrade nearly 100 % of 0.02 mmol L−1 AO7 within 60 min. In addition, the trapping experiments confirmed the participation of sulfate radicals (SO4•−) and hydroxyl radicals (HO•) as reactive species in the system. Furthermore, the effects of parameters including catalyst and PMS dosages, initial concentration of AO7, and pH were studied. Results showed that the decolourisation efficiency increased with the increase of catalyst dosage, but decreased with the increase of AO7 concentration. The optimal PMS concentration was 0.675 mmol L−1, and initial pH showed no significant effect on the degradation of AO7. Moreover, the CuNi@C could be reused four times with good activity and reusability. Findings revealed that the CuNi@C/PMS system shows potential for degrading contaminants in the environment, due to its catalytic activity and non-negligible adsorption.

scholarly journals Oxidative degradation of phenol in aqueous media using ultrasound

1994 ◽  
Vol 1 (2) ◽  
pp. S97-S102 ◽  
Author(s):  
J. Berlan ◽  
F. Trabelsi ◽  
H. Delmas ◽  
A.M. Wilhelm ◽  
J.F. Petrignani
Keyword(s):  
Aqueous Media ◽  
Oxidative Degradation

Degradation of Crystal Violet Dye by Fenton and Photo-Fenton Oxidation Processes

2018 ◽  
Vol 232 (12) ◽  
pp. 1771-1786 ◽  
Author(s):  
Faiza Rehman ◽  
Murtaza Sayed ◽  
Javed Ali Khan ◽  
Luqman Ali Shah ◽  
Noor S. Shah ◽  
...  
Keyword(s):  
Ion Chromatography ◽  
Crystal Violet ◽  
Aqueous Media ◽  
Oxidative Degradation ◽  
Order Rate Constant ◽  
Oh Radical ◽  
Fenton Process ◽  
Operational Parameters ◽  
Oxidation Processes ◽  
Crystal Violet Dye

Abstract The oxidative degradation of CV dye in aqueous media has been evaluated using Fenton (Fe2+/H2O2) and photo-Fenton (Fe2+/H2O2/UV) processes. Various operational parameters like H2O2 dosages, Fe2+ dosages and [CV]0 were optimized of both Fenton and photo-Fenton processes for the removal of CV dye from aqueous media. Kinetic results indicated that photo-Fenton process (kobs=0.0097 min−1, t1/2=71.45 min) is more effective than Fenton process (kobs=0.0074 min−1, t1/2=93.66 min). Second order rate constant of ˙OH radical with CV dye was calculated to be 3.96×109 M−1s−1. De-methylated organic intermediates of CV dye detected by LC-MS and some other intermediates like CH3COO−, HCOO−, NH4+ and Cl− were identified by ion-chromatography.

Photo-oxidative degradation of toluene in aqueous media by hydroxyl radicals

2010 ◽  
Vol 215 (1) ◽  
pp. 59-68 ◽  
Author(s):  
Arzu Hatipoglu ◽  
Davide Vione ◽  
Yelda Yalçın ◽  
Claudio Minero ◽  
Zekiye Çınar
Keyword(s):  
Hydroxyl Radicals ◽  
Aqueous Media ◽  
Oxidative Degradation

scholarly journals EFFECT OF NANOCARBON ADDITIVES ON STABILITY OF POLYMER COMPOSITES

2020 ◽  
Vol 63 (11) ◽  
pp. 4-12
Author(s):  
Eldar B. Zeynalov ◽  
Minira M. Agaguseynova ◽  
Nazila I. Salmanova
Keyword(s):  
Composite Materials ◽  
Polymer Composites ◽  
Polymer Composite ◽  
Aqueous Media ◽  
Oxidative Degradation ◽  
Fullerene Molecule ◽  
Industrial Applications ◽  
Polymer Composite Materials ◽  
Optimal Dosage ◽  
Interfacial Compatibility

This review briefly describes a state of research on the effect of fullerenes and carbon nanotubes (CNTs) on a durability of various polymer composite materials under extreme conditions. Fullerenes C60, C70, fullerene soot and CNTs integrated into the polymer matrix effectively prevent both thermal and thermo-oxidative degradation, as well as photo-oxidation processes. The stabilization mechanism of the carbon nanocompounds (CNC) is likewise and consists of the substantial end-capping termination of oxidation destructive chains on the nanocarbon skeleton. At that, the data array unequivocally indicates the predominant addition of carbon-centered alkyl radicals. Various polymer composite materials based on polyolefins, polyacrylates, polyamides, polycarbonates, elastomers are involved into the consideration. The approaches described are mostly aimed to increase the level of stabilizing activity of the polymer composites using different combinations of nanocarbon additives. The optimal dosage of CNC and interfacial compatibility between the polymer and fillers can significantly increase the heat resistance of the composites. The replacement of carbon atoms in the fullerene molecule with heteroatoms can also change its electronic properties and improve the antiradical and antioxidant activity. Areas for the effective use of fullerene C60 in aqueous media can be significantly expanded by modification with hydrophilic polymers. Thus, the performance of CNC integrated in the polymer composites is similar with those for strong synthetic stabilizers. CNC have good prospects for real industrial applications.

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