Catalytic wet oxidation of reactive dyes in water

Kim, S. C.; Jeong, Bora; Lee, D. K.

doi:10.1007/s11244-005-2521-5

Cited by 10 publications

(5 citation statements)

References 37 publications

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“…13 Mesoporous silica systems graed with a Schiff base moiety can be used as efficient catalysts for the degradation of dye molecules such as methyl orange, phenol red, methylene blue, rosebengal, sudan-III and reactive red. [14][15][16][17][18] The development of inexpensive, stable, efficient and band-gap tunable MOF based photocatalysts is still a major challenge, since they have a tendency to absorb the dye molecules by electrostatic interactions with surface containing hydroxyl groups. The high surface area materials have a tendency to absorb and activate the dye molecules to their excited states.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and photocatalytic studies of mesoporous silica grafted Ni(ii) and Cu(ii) complexes

Reddy

Balasubramanian

2015

RSC Adv.

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The mesoporous silica grafted nickel(II) and copper(II) complexes of the Schiff base ligand were synthesized. The functionalization of the ligand was achieved by the Schiff base condensation of 3-APTES and O,Oˈ-mono methylene bis(salicylidene). The Schiff base moiety was subsequently grafted with MCM41, followed by complexation with the metal salts. The compounds were characterized by spectral( Fourier Transform Infrared spectroscopy (FTIR), diffuse reflectance UV-Vis spectroscopy (DRS/UV-Vis), X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS)), thermal (Thermo Gravimetric Analysis (TGA)) microscopic(High Resolution Transmission Electron Microscopy (HRTEM) ) and surface Brunauer-Emmett-Teller (BET) method, N 2 -sorption isotherms) analysis. The compounds were employed in the photo oxidation of Methyl Orange (MO) and Reactive Red198 (RR). The copper complex exhibits higher activity in the photo degradation of the dyes. The reusable photocatalysts show comparable activity to that of fresh catalyst without loss of their catalytic nature

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Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and photocatalytic studies of mesoporous silica grafted Ni(ii) and Cu(ii) complexes

Reddy

Balasubramanian

2015

RSC Adv.

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“…161 Pd-Pt on alumina was used to remove reactive dye with an excess of oxygen and in the presence of 1% of hydrogen. 162,163 TOC removal increased from ∼40% to almost 100% by adding a small amount of hydrogen to the gas under the same process conditions. The dye was found to be adsorbed easier on the reduced Pt surface than on the oxidized Pt surface, and this is an essential step of CWAO.…”

Section: Oxidation Of Carboxylic Acidsmentioning

confidence: 95%

“…The use of hydrogen peroxide for the catalytic treatment of reactive dyes in the presence of the Al−Cu on pillared clay resulted in complete removal of color within 20 min at 383 K under atmospheric pressure . Pd−Pt on alumina was used to remove reactive dye with an excess of oxygen and in the presence of 1% of hydrogen. , TOC removal increased from ∼40% to almost 100% by adding a small amount of hydrogen to the gas under the same process conditions. The dye was found to be adsorbed easier on the reduced Pt surface than on the oxidized Pt surface, and this is an essential step of CWAO.…”

Section: Catalystsmentioning

confidence: 99%

“…Al−Cu on pillared clay reactive dyes SR, 353 K, atm. pressure, hydrogen peroxide Kim and Lee 161 Pd−Pt/Al 2 O 3 reactive dyes (black 5, blue 19, red 198) SR, 473 K, 2.43 MPa (total pressure) Kim et al. , CoAlPO 4 5- and ceria reactive dye (b-21) SR, 398−438 K, 1.0 MPa (oxygen partial pressure) Chang et al polyoxytungstates acid dye Orange II SR, 433−563 K, 0.6−3.0 MPa (oxygen partial pressure) Arslan and Balcioglu 165 Pt on multiwalled carbon nanotubes (MWNT) monoazo dye (Chromotrop 2R), diazo dye (erionyl red B), and triazo dye (solophenhyl green) SR, 493 K, 0.69 MPa Garcia et al …”

Section: Catalystsmentioning

confidence: 99%

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Catalytic Wet Air Oxidation: Are Monolithic Catalysts and Reactors Feasible?

Cybulski

2007

Ind. Eng. Chem. Res.

113

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The paper provides the literature data on heterogeneous catalysts for catalytic wet air oxidation (CWAO). A survey of investigations on process mechanism and kinetics of the CWAO is presented. The performance of various reactors types is analyzed using experimental data and results of simulations. Monolithic catalysts for the CWAO are discussed. The possibility of application of monolithic reactors for the CWAO process is analyzed.

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“…Thus, Schiff-base complexes that immobilised in a mesoporous silica network showed a dramatic change in their stability and activity as a catalyst [29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Predominant role of grafted iron(III) Schiff-base complex in oxidation of gaseous and aqueous reactants: A visible light responsive photocatalyst

Tabari

Jamali

2017

Journal of Photochemistry and Photobiology A: Chemistry

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The visible light response and photocatalytic activities of covalently bonded iron(III)-Schiff base complex is evaluated by photooxidation of nitric oxide under visible light exposure. In addition, this study reports the existing of dominant active sites on the surface of grafted complex toward water adsorption, which leads to the generation of hydroxyl radicals under illumination. Moreover, the morphological analysis exhibits high surface area (575 m 2 /g) with an average pore diameter of 21 nm; in this context, XRD analysis shows that the characteristic peaks of the Schiff-base complex are covered by the amorphous structure of the silica network, however, the microscopic analysis reveals the irregular shape of the grafted catalyst. Furthermore, the catalytic activity was evaluated by photooxidation of reactive blue 13 dye in aqueous solution under ambient light illumination. Also, the reaction variables such as the amount of catalyst, pH value, concentration and temperature of the dye solution were studied and discussed in detail. It seems, the enhanced activity of the photocatalyst toward the dye decolourization is a consequence of its uniform surface, large surface area, fine particles and active surface for the water adsorption.

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Catalytic wet oxidation of reactive dyes in water

Abstract: In the presence of small amount of H 2 the Pd-Pt/Al 2 O 3 bimetallic catalysts showed excellent activity toward wet oxidation of reactive dyes due to the combined roles of faster redox cycle and the formation of H 2 O 2 .

Cited by 10 publications

References 37 publications

Synthesis, characterization and photocatalytic studies of mesoporous silica grafted Ni(ii) and Cu(ii) complexes

Synthesis, characterization and photocatalytic studies of mesoporous silica grafted Ni(ii) and Cu(ii) complexes

Catalytic Wet Air Oxidation: Are Monolithic Catalysts and Reactors Feasible?

Predominant role of grafted iron(III) Schiff-base complex in oxidation of gaseous and aqueous reactants: A visible light responsive photocatalyst

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