Photo-Degradation of Methamidophos (An Insecticide) in Water Using Dye-Modified Nano-Crystalline TiO2 Supported onto Activated Carbon Surfaces

2020 ◽  
Vol 8 (2) ◽  
pp. 100-111
Author(s):  
Lamees Majad ◽  
Nidal Zatar ◽  
Sameer Amereih ◽  
Hikmat Hilal
Keyword(s):  
Activated Carbon ◽  
Uv Degradation ◽  
Photo Degradation ◽  
New Class ◽  
Nano Crystalline ◽  
Catalytic Sites ◽  
Modified Surfaces ◽  
Significant Temperature ◽  
A Charge ◽  
Catalyst Efficiency

Anatase TiO2 surfaces have been treated with 2, 4, 6-triphenylpyrylium hydrogen sulfate (TPPHS) or tripyridylporhpyrinatomanganese(II) (MnP) dyes to yield the modified TiO2/ dye surfaces. The modified TiO2/dye surface was then supported onto activated carbon (AC) surfaces to yield a new class of catalytic system AC/TiO2/dye. The catalytic activities of naked TiO2, dye solution, TiO2/dye, and AC/TiO2/dye systems were examined in photo-degradation of Methamidophos (insecticide) in water, using both UV and visible light. All examined systems showed catalytic activity when used either in the UV or the visible regions, but the AC/TiO2/ dye showed the highest activity. The dye role, in enhancing activity of modified surfaces in UV degradation of the examined contaminants, is understandable by a charge-transfer catalytic effect. AC role can be explained by its ability to adsorb contaminant molecules and bringing them closer to catalytic sites. There was no significant temperature effect on catalyst efficiency in Methamidophos photo-degradation. Oxygen is essential for semiconductor photocatalytic degradation of Methamidophos, but higher oxygen concentrations lead to a downturn of the reaction rate.

Photo-Degradation of Methamidophos (An Insecticide) in Water Using Dye-Modified Nano-Crystalline TiO2 Supported onto Activated Carbon Surfaces

2020 ◽  
Vol 8 (2) ◽  
pp. 100-111
Author(s):  
Lamees Majad ◽  
Nidal Zatar ◽  
Sameer Amereih ◽  
Hikmat Hilal
Keyword(s):  
Activated Carbon ◽  
Uv Degradation ◽  
Photo Degradation ◽  
New Class ◽  
Nano Crystalline ◽  
Catalytic Sites ◽  
Modified Surfaces ◽  
Significant Temperature ◽  
A Charge ◽  
Catalyst Efficiency

Anatase TiO2 surfaces have been treated with 2, 4, 6-triphenylpyrylium hydrogen sulfate (TPPHS) or tripyridylporhpyrinatomanganese(II) (MnP) dyes to yield the modified TiO2/ dye surfaces. The modified TiO2/dye surface was then supported onto activated carbon (AC) surfaces to yield a new class of catalytic system AC/TiO2/dye. The catalytic activities of naked TiO2, dye solution, TiO2/dye, and AC/TiO2/dye systems were examined in photo-degradation of Methamidophos (insecticide) in water, using both UV and visible light. All examined systems showed catalytic activity when used either in the UV or the visible regions, but the AC/TiO2/ dye showed the highest activity. The dye role, in enhancing activity of modified surfaces in UV degradation of the examined contaminants, is understandable by a charge-transfer catalytic effect. AC role can be explained by its ability to adsorb contaminant molecules and bringing them closer to catalytic sites. There was no significant temperature effect on catalyst efficiency in Methamidophos photo-degradation. Oxygen is essential for semiconductor photocatalytic degradation of Methamidophos, but higher oxygen concentrations lead to a downturn of the reaction rate.

Photo-catalytic Study of Malachite Green Dye Degradation Using Rice Straw Extracted Activated Carbon Supported ZnO Nano-particles

2020 ◽  
Vol 10 (6) ◽  
pp. 849-859
Author(s):  
Radwa A. El-Salamony ◽  
Abeer A. Emam ◽  
Nagwa A. Badawy ◽  
Sara F. El-Morsi
Keyword(s):  
Activated Carbon ◽  
Visible Light ◽  
Rice Straw ◽  
Malachite Green ◽  
Dye Degradation ◽  
Nano Particles ◽  
Oh Radicals ◽  
Impregnation Method ◽  
Photo Degradation ◽  
Malachite Green Dye

Objective: ZnO nanoparticles were synthesized using wet impregnation method, and activated carbon from rice straw (RS) prepared through chemical route. Methods: The nano-composites ZnO-AC series were prepared with different ZnO:AC ratio of 10, 20, 50, and 70% to optimize the zinc oxide nanoparticles used. The obtained composites were characterized by FE-SEM, XRD, SBET, and optical techniques then used for the photo-degradation of Malachite green dye (MG) under visible light. Results: It was found that 10ZnO-AC exhibited excellent visible light photo-catalytic performance. The ·OH radicals’ formation is matching with photo-activity of the prepared composites. The photo-degradation efficiency of MG increased from 63% to 93%, when the 10ZnO-AC photocatalyst amount was increased from 0.5 to 6 g/L. Conclusion: The GC-MS technique was used to analyze the intermediates formed; up to 15 kinds of chemicals were identified as the degradation products.

Selective Electroless Metallization of Patterned Ligand Surfaces

1992 ◽  
Vol 260 ◽  
Author(s):  
W. J. Dressick ◽  
C. S. Dulcey ◽  
J. M. Calvert ◽  
J. H. Georger ◽  
G. S. Calabrese ◽  
...  
Keyword(s):  
Metal Binding ◽  
Metal Ion ◽  
Ligand Interaction ◽  
Patterned Surface ◽  
Electroless Metallization ◽  
Catalytic Sites ◽  
Modified Surfaces ◽  
Deep Uv

ABSTRACTA process for creating patterns of metal-binding ligands on a variety of substrates is described. Deep UV patterning of chemisorbed ligand-bearing organosilane films creates modified surfaces that can selectively bind species such as Pd(II) via a covalent metal ion-ligand interaction. Patterned surface-bound Pd(II) is used to initiate additive electroless metallization at the catalytic sites. Metal adhesion to the substrate is controlled by the nature of the catalyst-ligand interaction.

RESOURCE STABILITY OF ACTIVATED CARBON FROM WOOD IN SUPERCAPACITORS WITH ORGANIC ELECTROLYTE

1970 ◽  
Vol 61 (11) ◽  
Author(s):  
Daria E. Vervikishko ◽  
Svetlana A. Kochanova ◽  
Alexander V. Dolzhenko ◽  
Irina A. Lipatova ◽  
Evgeny I. Shkolnikov
Keyword(s):  
Activated Carbon ◽  
Functional Groups ◽  
Activated Carbons ◽  
Autonomous Systems ◽  
Great Influence ◽  
Organic Electrolyte ◽  
Electrochemical Characteristics ◽  
High Resource ◽  
Electric Capacity ◽  
A Charge

One of advantages of supercapacitors in comparison with batteries is their potentially high resource. Resource stability, as well as a supercapacitor self-discharge, depends on many factors. The most important of them are impurities in electrolyte, carbon materials and functional groups on their surface. Authors have offered perspective carbon material – the activated carbon from wood received by thermochemical synthesis. The electric capacity around 160 F/g is reached in supercapacitors with aprotic organic electrolyte (1M tetraethylammonium tetrafluoroborate). Authors have conducted the research of properties of the developed activated carbons from wood aiming to check resource opportunities supercapacitors with aprotic organic electrolyte. Resource tests lasted more than 6.5 months. Today more than one million cycles of a charge – discharge are reached at charge current of 100 mA/cm2. It is established that functional groups have a great influence on a resource of supercapacitors. To achieve high levels of stability in the resource activation technology developed carbon is provided to minimize the number of functional groups. Heat treatment of carbons after activation in the environment of argon at the increased temperatures was in addition carried out. It is shown that electrochemical characteristics of the supercapacitor throughout resource tests are at the stable level. Thus, there are bases to believe that devices on the basis of this carbon will be able to work continuously during the large period of time that is especially important, for example, for the autonomous systems located in hard-to-reach spots.

Activated carbon fibers as a support for nickel diimine complexes and their application in ethylene oligomerization

2020 ◽  
Vol 44 (35) ◽  
pp. 15100-15108
Author(s):  
Yuri M. Variani ◽  
Christian W. Lopes ◽  
Bruna P. Nicola ◽  
Debora M. Meira ◽  
Sibele B. C. Pergher ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Ethylene Oligomerization ◽  
Synthesis And Characterization ◽  
Activated Carbon Fibers ◽  
New Class ◽  
Diimine Ligand ◽  
Diimine Complexes

In this work, we demonstrate the synthesis and characterization of a new class of β-diimine ligand combined with the alkoxysilane group CPTMS ((3-chloropropyl)trimethoxysilane), covalently anchored to the surface of activated carbon fibers (ACF).

scholarly journals Raman scattering and electrical conductivity in highly disordered activated carbon fibers

1993 ◽  
Vol 8 (3) ◽  
pp. 489-500 ◽  
Author(s):  
A.W.P. Fung ◽  
A.M. Rao ◽  
K. Kuriyama ◽  
M.S. Dresselhaus ◽  
G. Dresselhaus ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Activated Carbon ◽  
Raman Scattering ◽  
Carbon Fibers ◽  
Conduction Mechanism ◽  
Activated Carbon Fibers ◽  
Tunneling Conduction ◽  
A Charge ◽  
Two Peaks ◽  
Variable Range Hopping Conduction

Because of their unusually large specific surface area (SSA), Activated Carbon Fibers (ACF's) have a huge density of micropores and defects. The Raman scattering technique and low-temperature dc electrical conductivity measurements were used as characterization tools to study the disorder in ACF's with SSA ranging from 1000 m2/g to 3000 m2/g. Two peaks were observed in every Raman spectrum for ACF's and they could be identified with the disorder-induced peak near ∼1360 cm−1 and the Breit–Wigner–Fano peak near ∼1610 cm−1 associated with the Raman-active E2g2 mode of graphite. The graphitic nature of the ACF's is shown by the presence of a well-defined graphitic structure with La values of 20–30 Å. We observed that the Raman scattering showed more sensitivity to the precursor materials than to the SSA of the ACF's. From 4 K to room temperature, the dc electrical resistivity in ACF's is observed to follow the exp [(T0/T)1/2] functional form and it can be accounted for by a charge-energy-limited tunneling conduction mechanism. Coulomb-gap conduction and n-dimensional (n ≤ 3) variable-range hopping conduction models were also considered but they were found to give unphysical values for their parameters.

A charge-switchable, four-armed polymeric photosensitizer for photodynamic cancer therapy

2014 ◽  
Vol 50 (33) ◽  
pp. 4354-4357 ◽  
Author(s):  
Chung-Sung Lee ◽  
Wooram Park ◽  
Young Um Jo ◽  
Kun Na
Keyword(s):  
Cancer Therapy ◽  
Water Soluble ◽  
New Class ◽  
Photodynamic Cancer Therapy ◽  
Ph Dependent ◽  
A Charge

A water-soluble, charge-switchable, four-armed polymeric photosensitizer (C4P-PS), in which charge switching is pH dependent, has been designed as a new class of photosensitizer for photodynamic cancer therapy.

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