Solar light sensitive samarium-doped ceria photocatalysts: microwave synthesis, characterization and photodegradation of Acid Orange 7 at atmospheric conditions and in the absence of any oxidizing agents

RSC Advances ◽  
2015 ◽  
Vol 5 (54) ◽  
pp. 43081-43091 ◽  
Author(s):  
Bappaditya Mandal ◽  
Aparna Mondal
Keyword(s):  
Microwave Synthesis ◽  
Solar Light ◽  
Doped Ceria ◽  
Atmospheric Conditions ◽  
Acid Orange 7 ◽  
Acid Orange ◽  
Catalytic Activities ◽  
Oxidizing Agents ◽  
Ph Range

A microwave synthesized Sm3+-doped CeO2 photocatalyst exhibits excellent catalytic activities for degrading Acid Orange 7 under sunlight only over a broad pH range.

scholarly journals Mechanistic and kinetic study of solar-light induced photocatalytic degradation of Acid Orange 7 in aqueousTiO2suspensions

2003 ◽  
Vol 5 (2) ◽  
pp. 59-67 ◽  
Author(s):  
Maria Stylidi ◽  
Dimitris I. Kondarides ◽  
Xenophon E. Verykios
Keyword(s):  
Photocatalytic Degradation ◽  
Initial Rate ◽  
Reaction Pathway ◽  
Full Range ◽  
Inorganic Ions ◽  
Reaction Rates ◽  
Solar Light ◽  
Acid Orange 7 ◽  
Acid Orange ◽  
Solution Kinetic

The photocatalytic degradation of aqueous solutions of Acid Orange 7 inTiO2suspensions has been investigated with the use of a solar light simulating source. It has been found that, when the full range of emitted photons is used, decolorization and complete mineralization of the solution is achieved with satisfactory rates, depending on initial dye concentration. A reaction pathway is proposed according to which degradation of the dye molecules adsorbed on the photocatalyst surface takes place via a series of oxidation steps, which lead to decolorization and formation of a number of intermediates, mainly aromatic and aliphatic acids, which are further oxidized toward compounds of progressively lower molecular weight. Eventually, mineralization is achieved leading to the formation of gas phaseCO2and inorganic ions in solution. Kinetic results show that the initial rate of decolorization depends strongly on surface coverage and on incident photon energy. Visible light photons contribute to decolorization, via the photosensitization mechanism, but with reaction rates which are more than two orders of magnitude lower than the corresponding ones induced by photons of energy higher than that of the band gap of the semiconductor. In both cases, the initial rate of decolorization is significantly reduced for dye coverages close to monolayer.

TiO2-assisted degradation of acid orange 7 textile dye under solar light

2007 ◽  
Vol 91 (15-16) ◽  
pp. 1492-1495 ◽  
Author(s):  
Susana Flores Villanueva ◽  
Susana Silva Martínez
Keyword(s):  
Solar Light ◽  
Textile Dye ◽  
Acid Orange 7 ◽  
Acid Orange

Cu(II)-enhanced degradation of acid orange 7 by Fe(II)-activated persulfate with hydroxylamine over a wide pH range

Chemosphere ◽  
2020 ◽  
Vol 238 ◽  
pp. 124533 ◽  
Author(s):  
Xin Liu ◽  
Baoling Yuan ◽  
Jing Zou ◽  
Lingbin Wu ◽  
Lin Dai ◽  
...  
Keyword(s):  
Acid Orange 7 ◽  
Acid Orange ◽  
Wide Ph Range ◽  
Ph Range ◽  
Activated Persulfate ◽  
Enhanced Degradation

Photocatalytic mineralization of azo dye Acid Orange 7 under solar light irradiation

2012 ◽  
Vol 48 (1-3) ◽  
pp. 245-251 ◽  
Author(s):  
Soon-An Ong ◽  
Li-Ngee Ho ◽  
Yee-Shian Wong ◽  
Ohm-Mar Min ◽  
Li-Sze Lai ◽  
...  
Keyword(s):  
Azo Dye ◽  
Light Irradiation ◽  
Solar Light ◽  
Acid Orange 7 ◽  
Acid Orange ◽  
Solar Light Irradiation

Preparation of cationic waste paper and its application in poisonous dye removal

2013 ◽  
Vol 67 (11) ◽  
pp. 2560-2567 ◽  
Author(s):  
Fan Yang ◽  
Xiaojie Song ◽  
Lifeng Yan
Keyword(s):  
Low Cost ◽  
Aqueous Suspension ◽  
Order Kinetic ◽  
Acid Orange 7 ◽  
Anionic Dyes ◽  
Experimental Conditions ◽  
Adsorption Models ◽  
Acid Orange ◽  
Initial Ph ◽  
Pseudo Second Order

Cationic paper was prepared by reaction of paper with 2,3-epoxypropyltrimethylammonium chloride in aqueous suspension, and tested as low-cost adsorbent for wastewater treatment. The experimental results revealed that anionic dyes (Acid Orange 7, Acid Red 18, and Acid Blue 92) were adsorbed on the cationic paper nicely. The maximum amount of dye Acid Orange 7 adsorbed on cationic paper was 337.2 mg/g in experimental conditions. The effects of initial dye concentration, temperature, and initial pH of dye solution on adsorption capacity of cationic paper were studied. The pseudo-first-order and pseudo-second-order kinetic models were applied to describe the kinetic data. The Freundlich and Langmuir adsorption models were used to describe adsorption equilibrium. The thermodynamic data indicated that the adsorption process of dye on cationic paper occurred spontaneously.

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