Iron-nickel bimetallic nanoparticles for reductive degradation of azo dye Orange G in aqueous solution

2008 ◽  
Vol 79 (3) ◽  
pp. 270-278 ◽  
Author(s):  
Alok D. Bokare ◽  
Rajeev C. Chikate ◽  
Chandrashekhar V. Rode ◽  
Kishore M. Paknikar
Keyword(s):  
Aqueous Solution ◽  
Azo Dye ◽  
Bimetallic Nanoparticles ◽  
Reductive Degradation ◽  
Orange G ◽  
Iron Nickel ◽  
Degradation Of Azo Dye

scholarly journals EFFECT OF RADICAL SCAVENGERS AND PROPOSED PATHWAYS FOR DEGRADATION OF AZO DYE IN AQUEOUS SOLUTION UNDER PRESENCE OF IRON(III) AND PERSULPHATE

2017 ◽  
Vol 60 (4) ◽  
pp. 88
Author(s):  
Heng Zhong ◽  
Hui Zhao ◽  
Jun Li ◽  
Lei Sun ◽  
Aihua Xu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Carboxylic Acids ◽  
Azo Dye ◽  
Water Discharge ◽  
Radical Scavenging ◽  
Degradation Process ◽  
Ionization Mass ◽  
Radical Scavengers ◽  
Acid Orange 7 ◽  
Degradation Of Azo Dye

The degradation process of Acid Orange 7 (AO7) in aqueous solutions by iron(III) under activation by persulfate (PS, S2O82-) oxidation and Visible (Vis) light (≥420 nm) exposure has been studied. The radical scavenging effect was examined by using ethanol (EtOH), tert-butyl alcohol (TBA) and sodium azide to state that the hydroxyl radical (·OH) is regarded as the predominant reactive oxidant for the AO7 decolorization, while the sulfate radical (SO4·-) and singlet oxygen(1O2) are also make their contribution to dye's degradation. The reaction intermediates were determined by electrospray ionization-mass spectrometry (ESI-MS) analysis, and a probable degradation pathway mechanism has been proposed. It was suggested, that firstly an initial successive radical attacks the N atom of the dye, which decompose to p-phenolsulfonic acid and 1,2-naphthaquinone through the contemporaneous break of two C-N bonds. Afterwards, subsequent oxidation of these products and loss of the −SO3− group are observed. Finally, the acyclic carboxylic acids are formed from the central ring-opening, and then the further oxidation to simple carboxylic acids is evident. The work can provide a simple, effective and economic system for the treatment of non-biodegradable azo dye. The recommendations were proposed on organization of an effective quality control of technological water discharge and products of its processing at the local wastewater treatment facilities of industrial plants for prevention of the ingress of hazardous biological substances to the hydrosphere.Forcitation:Heng Zhong, Hui Zhao, Jun Li, Lei Sun, Aihua Xu, Dongsheng Xia, Nevsky A.V. Effect of radical scavengers and proposed pathways for degradation of azo dye in aqueous solution under presence of iron (III) and persulphate. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 4. P. 88-94.

Photocatalytic degradation of azo dye in TiO2 suspended solution

2001 ◽  
Vol 43 (2) ◽  
pp. 313-320 ◽  
Author(s):  
C.-H. Hung ◽  
P.-C. Chiang ◽  
C. Yuan ◽  
C.-Y. Chou
Keyword(s):  
Reaction Time ◽  
Light Intensity ◽  
Photocatalytic Degradation ◽  
Azo Dye ◽  
Batch Reactor ◽  
Reaction Rates ◽  
Pseudo First Order Reaction ◽  
Degradation Rates ◽  
Orange G ◽  
Degradation Of Azo Dye

The photocatalysis of azo dye, Orange G, by P-25 anatase TiO2 was investigated in this research. The experiments were conducted in a batch reactor with TiO2 powder suspension. Four near-UV lamps were used as the light source. The experimental variables included solution pH level, amount of TiO2, illumination light intensity, and reaction time. A pseudo-first order reaction kinetic was proposed to simulate the photocatalytic degradation of Orange G in the batch reactor. More than 80% of 10 mg/L Orange G decomposition in 60-minute reaction time was observed in this study and fast decomposition of Orange G only occurred in the presence of both TiO2 and suitable light energy. Faster degradation of Orange G was achieved under acid conditions. The degradation rates of Orange G at pH = 3.0 were about two times faster than those at pH = 7.0. Faster degradation of azo dye was observed for greater irradiated light intensity and more TiO present during the reaction. The reaction rates were proportional to TiO2concentration and light intensity with the power order of 0.726 and 0.734, respectively.

Highly efficient degradation of azo dye Orange G using laterite soil as catalyst under irradiation of non-thermal plasma

2019 ◽  
Vol 246 ◽  
pp. 211-220 ◽  
Author(s):  
Jean-Baptiste Tarkwa ◽  
Elie Acayanka ◽  
Bo Jiang ◽  
Nihal Oturan ◽  
Georges Y. Kamgang ◽  
...  
Keyword(s):  
Thermal Plasma ◽  
Azo Dye ◽  
Laterite Soil ◽  
Highly Efficient ◽  
Orange G ◽  
Non Thermal Plasma ◽  
Degradation Of Azo Dye

Decolourization of the azo dye Orange G in aqueous solution via a heterogeneous Fenton-like reaction catalysed by goethite

2012 ◽  
Vol 33 (14) ◽  
pp. 1545-1552 ◽  
Author(s):  
Honghai Wu ◽  
Xiaowen Dou ◽  
Dayi Deng ◽  
Yufeng Guan ◽  
Liguo Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Azo Dye ◽  
Heterogeneous Fenton ◽  
Orange G

Catalytic Degradation of Azo Dye Congo Red in Aqueous Solution by LiMn2O4

2013 ◽  
Vol 634-638 ◽  
pp. 500-503
Author(s):  
Yun Hui Long ◽  
Jun Ming Guo ◽  
Du Shu Huang ◽  
Gui Yang Liu
Keyword(s):  
Aqueous Solution ◽  
Congo Red ◽  
Azo Dye ◽  
Orthogonal Experiment ◽  
Catalytic Degradation ◽  
Spinel Limn2o4 ◽  
Experimental Conditions ◽  
Initial Ph ◽  
Degradation Of Azo Dye

Catalytic degradation of azo dye Congo red in aqueous solution by spinel LiMn2O4 was studied. Degradation conditions were also optimized by orthogonal experiment. The results showe that the optimal degradation experimental conditions are: The initial pH is 3.0; The amount of catalyst is 10.0 mg; The amount of 30% H2O2 is 2.00 mL. The decolourization ratio of 20 mL 20 mg/L Congo red solution is 85.95%.

scholarly journals Oxidative degradation of Orange G in aqueous solution by persulfate activated with pyrite

2020 ◽  
Author(s):  
Xin Zhang ◽  
Yingzhi Qin ◽  
Weiting Zhang ◽  
Yali Zhang ◽  
Guang-En Yuan
Keyword(s):  
Aqueous Solution ◽  
Azo Dye ◽  
Dye Degradation ◽  
Oxidative Degradation ◽  
Reactive Species ◽  
Lower Solution ◽  
Solution Ph ◽  
Paramagnetic Resonance ◽  
Orange G ◽  
Electron Paramagnetic

Abstract Orange G (OG), a typical azo dye in textile wastewaters, has been the subject of intense investigations. This study investigated oxidative degradation of OG in aqueous solution by persulfate (PS) activated with pyrite. A complete destruction of OG was achieved within 60 min in the pyrite/PS system. Lower solution pH, smaller pyrite particles and higher pyrite dosage was beneficial for OG degradation. Higher PS concentration was also in favour of OG degradation, but excess PS would decrease the removal efficiency of OG. The addition of HCO3− and H2PO4− but Cl− had inhibitory effects on the destruction of OG. The results of quenching experiments and electron paramagnetic resonance tests proved that SO4•− and •OH were the dominant reactive species responsible for OG degradation in the pyrite/PS system. The azo bond, naphthalene ring and benzene ring of OG were all destroyed by the generated reactive species. The mineralization rate of OG reached 34.4% after 60 min of reaction. This work will provide information for understanding azo dye degradation by pyrite activated PS.

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