GO Nanosheets for Solar Assisted Dye Degradation in Aqueous Solution

2019 ◽  
pp. 81-87
Author(s):  
Mahima Sharma ◽  
Kannikka Behl ◽  
Subhasha Nigam ◽  
Monika Joshi
Keyword(s):  
Aqueous Solution ◽  
Dye Degradation

scholarly journals Effect of thermal treatment on the catalytic activity of a Fe-rich bentonite for the photo-Fenton reaction

Cerâmica ◽  
2019 ◽  
Vol 65 (373) ◽  
pp. 147-152 ◽  
Author(s):  
B. M. Zimmermann ◽  
S. Silvestri ◽  
J. Leichtweis ◽  
G. L. Dotto ◽  
E. S. Mallmann ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Rhodamine B ◽  
Fenton Reaction ◽  
Dye Degradation ◽  
Mesoporous Structure ◽  
Iron Leaching ◽  
Visible Irradiation ◽  
Reaction Cycles ◽  
Adsorption Desorption ◽  
Thermally Treated

Abstract The objective of this work was to evaluate the degradation of rhodamine B dye from aqueous solution by photo-Fenton reaction under visible irradiation using a Fe-rich bentonite as a catalyst. The material was thermally treated at a low temperature (200 °C) and characterized by XRD, N2 adsorption-desorption isotherms, FTIR, SEM-EDS and XRF. Iron leaching in aqueous solution after the photo-Fenton reaction was evaluated by atomic absorption spectroscopy. The material exhibited a mesoporous structure, containing a specific surface area of 99 m2.g-1. The catalytic results showed significant dye degradation, reaching 95% of decolorization and 72% of mineralization at 300 min of reaction. The catalyst showed high chemical stability in four reaction cycles. Therefore, this thermally treated Fe-rich bentonite can be considered as a promising catalyst in the heterogeneous photo-Fenton reaction for the degradation of rhodamine B from aqueous solution.

Analysis and understanding of amido black 10B dye degradation in aqueous solution by electrocoagulation with the conventional oxidants peroxomonosulfate, peroxodisulfate and hydrogen peroxide

2015 ◽  
Vol 1 (1) ◽  
pp. 108-119 ◽  
Author(s):  
Kadarkarai Govindan ◽  
Mohan Raja ◽  
Subramanian Uma Maheshwari ◽  
Michael Noel
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Dye Degradation ◽  
Amido Black 10B ◽  
Amido Black

Degradation of amido black 10B dye by electrocoagulation processes assisted by conventional oxidants: peroxomonosulfate, peroxodisulfate and hydrogen peroxide.

Oxidation pathways of natural dye hematoxylin in aqueous solution

2010 ◽  
Vol 75 (11) ◽  
pp. 1097-1114 ◽  
Author(s):  
Romana Sokolová ◽  
Ilaria Degano ◽  
Magdaléna Hromadová ◽  
Jana Bulíčková ◽  
Miroslav Gál ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Aqueous Solution ◽  
Gas Chromatography ◽  
Cyclic Voltammetry ◽  
Dissociation Constants ◽  
Dye Degradation ◽  
Oxidation Mechanism ◽  
Oxidation Products ◽  
Mass Spectrometry Detection ◽  
Vis Spectroscopy

The oxidation mechanism of hematoxylin was studied in phosphate buffers and 0.1 M KCl by cyclic voltammetry and UV-Vis spectroscopy under deaerated conditions. The redox potential of hematoxylin in buffered solution strongly depends on pH. A two electron oxidation is preceded by deprotonation. The homogeneous rate of deprotonation process of hematoxylin in 0.1 M phosphate buffer is kd = (2.5 ± 0.1) × 104 s–1. The cyclic voltammetry under unbuffered conditions shows the distribution of various dissociation forms of hematoxylin. The dissociation constants pK1 = 4.7 ± 0.2 and pK2 = 9.6 ± 0.1 were determined using UV-Vis spectroscopy. The final oxidation product was identified by gas chromatography with mass spectrometry detection as hemathein. The distribution of oxidation products differs under buffered and unbuffered conditions. The dye degradation in natural unbuffered environment yields hemathein and hydroxyhematoxylin, which is absent in buffered solution.

Comparative study of UV/TiO2, UV/ZnO and photo-Fenton processes for the organic reactive dye degradation in aqueous solution

2007 ◽  
Vol 148 (1-2) ◽  
pp. 477-484 ◽  
Author(s):  
Igor T. Peternel ◽  
Natalija Koprivanac ◽  
Ana M. Lončarić Božić ◽  
Hrvoje M. Kušić
Keyword(s):  
Aqueous Solution ◽  
Comparative Study ◽  
Dye Degradation ◽  
Reactive Dye

Mechanistic study of carmoisine dye degradation in aqueous solution by Fenton process

2020 ◽  
Author(s):  
A. Wakrim ◽  
A. Dassaa ◽  
Z. Zaroual ◽  
S. EL Ghachtouli ◽  
J. Jamal Eddine ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Dye Degradation ◽  
Mechanistic Study ◽  
Fenton Process

scholarly journals Relevance of Toxicity Assessment in Wastewater Treatments: Case Study—Four Fenton Processes Applied to the Mineralization of C.I. Acid Red 14

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Rajaa Idel-aouad ◽  
Manuel Valiente ◽  
Carmen Gutiérrez-Bouzán ◽  
Mercè Vilaseca ◽  
Abdlrani Yaacoubi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Oxidation Process ◽  
Dye Degradation ◽  
Degradation Products ◽  
Toxicity Assessment ◽  
Ph Adjustment ◽  
Low Toxicity ◽  
Fenton Oxidation Process ◽  
Short Time

Fenton and Fenton-like processes, both in homogeneous and heterogeneous phases, have been applied to an aqueous solution containing the dye AR 14 in order to study the mineralization and toxicity of the solutions generated after color elimination. The mineralization of AR 14 occurred slower than the decolorization. The Microtox analysis of the treated solutions showed low toxicity intrinsic to the chemicals used in the process rather than the degradation products obtained after the treatment of the dye solution. The dye degradation for the Fenton oxidation process was initially faster than for the Fenton-like process but after a short time, the four processes showed similar degradation yields. All processes have shown good results being the heterogeneous process the most convenient since the pH adjustment is not necessary, the catalyst is recovered and reused and the generation of contaminated sludge is avoided.

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.

UV/Chlorine process for dye degradation in aqueous solution: Mechanism, affecting factors and toxicity evaluation for textile wastewater

2020 ◽  
Vol 8 (5) ◽  
pp. 104244 ◽  
Author(s):  
Behnaz Nikravesh ◽  
Asma Shomalnasab ◽  
Aliyehsadat Nayyer ◽  
Nafiseh Aghababaei ◽  
Rahil Zarebi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Dye Degradation ◽  
Textile Wastewater ◽  
Affecting Factors ◽  
Toxicity Evaluation ◽  
Solution Mechanism

scholarly journals Synergistic Effect of Dielectric Barrier Discharge Plasma and TiO2-Pillared Montmorillonite on the Degradation of Rhodamine B in an Aqueous Solution

Catalysts ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 359
Author(s):  
Mikhail F. Butman ◽  
Andrey A. Gushchin ◽  
Nikolay L. Ovchinnikov ◽  
Grigoriy I. Gusev ◽  
Nikolay V. Zinenko ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Dielectric Barrier Discharge ◽  
Rhodamine B ◽  
Barrier Discharge ◽  
Dye Degradation ◽  
Energetic Efficiency ◽  
Dbd Plasma ◽  
Catalytic Method ◽  
Dielectric Barrier ◽  
Pillared Montmorillonite

Photocatalytic, plasma and combined plasma–photocatalytic processes were applied for the destruction of a model pollutant, Rhodamine B dye, in an aqueous solution (concentration of 40 mg/L). For this purpose TiO2-pillared montmorillonite was used as a photocatalyst (characterized by X-ray analysis and low-temperature nitrogen adsorption/desorption). It was prepared by the method of intercalation of titanium hydroxocomplexes, including hydrothermal activation of the process and preliminary mechanical treatment of the layered substrate. The dielectric barrier discharge (DBD) plasma in the presence of photocatalysts increases the efficiency of dye degradation (100%, 8 s) compared to plasmolysis (94%) and UV photolysis (92%, 100 min of UV irradiation); in contrast to photolysis, destructive processes are more profound and lead to the formation of simple organic compounds such as carboxylic acids. The plasma–catalytic method enhances by 20% the energetic efficiency of the destruction of Rhodamine B compared to DBD plasma. The efficiency of dye destruction with the plasma–catalytic method increases with the improvement of the textural properties of the photocatalyst.

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