Nitroxoline Azo Dye Complexes as Effective Heterogeneous Catalysts for Color Removal and Degradation of Some Organic Textile Dyes

2017 ◽  
Vol 49 (7) ◽  
pp. 464-476 ◽  
Author(s):  
Nadia El-Wakiel ◽  
Hoda El-Ghamry
Keyword(s):  
Azo Dye ◽  
Heterogeneous Catalysts ◽  
Textile Dyes ◽  
Color Removal

Evaluation of color removal and degradation of a reactive textile azo dye on nanoporous TiO2 thin-film electrodes

2004 ◽  
Vol 49 (22-23) ◽  
pp. 3807-3820 ◽  
Author(s):  
Patricia A. Carneiro ◽  
Marly E. Osugi ◽  
Jeosadaque J. Sene ◽  
Marc.A. Anderson ◽  
Maria Valnice Boldrin Zanoni
Keyword(s):  
Thin Film ◽  
Azo Dye ◽  
Tio2 Thin Film ◽  
Color Removal ◽  
Thin Film Electrodes

scholarly journals USING METAL WASTE SLAGS AS THE HETEROGENEOUS CATALYSTS OF OZONE FOR TREATMENT OF PULP WASTEWATER

2020 ◽  
Vol 58 (3A) ◽  
pp. 1
Author(s):  
Hu Tap Van
Keyword(s):  
Organic Compounds ◽  
Removal Efficiency ◽  
Heterogeneous Catalysts ◽  
Catalytic Ozonation ◽  
Cod Removal ◽  
Color Removal ◽  
Order Kinetic ◽  
First Order ◽  
Iron Slag ◽  
Ozonation Process

Catalytic ozonation is one of the promising treatment methods for removal of persistent organic compounds from water and wastewater. In this study, some metal slags such as: iron slag, lead slag, zinc slag, cadmium slag and copper slag originated from solid waste of Thai Nguyen Non-ferrous Metals Limited Company, Vietnam were used as heterogeneous catalysts for ozonation process to remove organic compounds from pulp wastewater. The effects of the initial pH (pHi) of pulp wastewater and the metal slag dosage on efficiency of decolorization and mineralization of pulp wastewater, in term of COD were investigated. The results indicated that iron slag was the most suitable catalyst for treatment of pulp wastewater by ozonation process with the highest removal efficiency of COD, namely, after 120 min of ozonation (with flowrate of O3 of 3.038 g/h) of the pulp wastewater (initial COD 1809 mg/L), COD removal efficiency, respectively, reached 91,16%; 84%; 83,83 %; 83,91%; 83,41% and 83,14% in the presence of iron, copper, zinc, lead, cadmium slag and ozone alone. Simultaneously, the color was almost completely removed (95.55 – 98.79%) by ozonation processes with using all before-mentioned metal slags as heterogeneous catalysts and ozone alone. Maximum COD and color removal efficiency obtained at pH 7 for ozonation alone and its combinations with iron slag. Moreover, an increase in the iron slag dosage from 0.125 g/L to 2.0 g/L for O3/iron slag could enhance COD and color removal of pulp wastewater. The K values (apparent first-order rate constant values) showed that the COD removal rate followed the pseudo-first-order kinetic model. This study also indicated that the main constituent FeO presence in iron slag reaction with O3 in heterogeneous catalytic ozonation system enhances removal efficiency of color and COD of pulp wastewater.

scholarly journals Supported Zinc Oxide Photocatalyst for Decolorization and Mineralization of Orange G Dye Wastewater under UV365 Irradiation

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Ming-Chin Chang ◽  
Hung-Yee Shu ◽  
Tien-Hsin Tseng ◽  
Hsin-Wen Hsu
Keyword(s):  
Reaction Time ◽  
Azo Dye ◽  
Textile Wastewater ◽  
Color Removal ◽  
Fluorescent Light ◽  
Preparation Temperature ◽  
Steel Mesh ◽  
Toc Removal ◽  
Photocatalytic System ◽  
Orange G

To solve the environmental challenge of textile wastewater, a UV/ZnO photocatalytic system was proposed. The objective of this study was to prepare a photocatalytic system by utilizing both cold cathode fluorescent light (CCFL) UV irradiation and steel mesh supported ZnO nanoparticles in a closed reactor for the degradation of azo dye C.I. Orange G (OG). Various operating parameters such as reaction time, preparation temperature, mixing speed, ZnO dosage, UV intensity, pH, initial dye concentration, and service duration were studied. Results presented efficient color and total organic carbon (TOC) removal of the OG azo dye by the designed photocatalytic system. The optimal ZnO dosage for color removal was 60 g m−2. An alkaline pH of 11.0 was sufficient for photocatalytic decolorization and mineralization. The rate of color removal decreased with the increase in the initial dye concentration. However, the rate of color removal increased with the increase in the UV intensity. The steel mesh supported ZnO can be used repeatedly over 10 times without losing the color removal efficiency for 120 min reaction time. Results of Fourier transform infrared (FTIR) and ion chromatography (IC) indicated the breakage of N=N bonds and formation of sulfate, nitrate, and nitrite as the major and minor products. The observation indicated degradation of dye molecules.

scholarly journals The Use of HRP in Decolorization of Reactive Dyes and Toxicological Evaluation of Their Products

2010 ◽  
Vol 2010 ◽  
pp. 1-7 ◽  
Author(s):  
Michelle Reis da Silva ◽  
Lívian Ribeiro Vasconcelos de Sá ◽  
Carlos Russo ◽  
Elita Scio ◽  
Viridiana Santana Ferreira-Leitão
Keyword(s):  
Reaction Time ◽  
Horseradish Peroxidase ◽  
Reactive Dyes ◽  
Artemia Salina ◽  
Textile Dyes ◽  
Color Removal ◽  
Toxicological Evaluation ◽  
Reaction Media ◽  
Potential Use

This work studied the potential use of horseradish peroxidase (HRP) in the decolorization of the following textile dyes: Drimarene Blue X-3LR (DMBLR), Drimarene Blue X-BLN (DMBBLN), Drimarene Rubinol X-3LR (DMR), and Drimarene Blue CL-R (RBBR). Dyes were individually tested in the reaction media containing 120 mg⋅L-1, considering the following parameters: temperature (20–45°C), H2O2 concentration (0–4.44 mmol⋅L-1), and reaction time (5 minutes, 1 and 24 h). The following conditions: 35°C, 0.55 mmol⋅L-1, and 1h, provided the best set of results of color removal for DMBLR (99%), DMBBLN (77%), DMR (94%), and RBBR (97%). It should be mentioned that only 5 minutes of reaction was enough to obtain 96% of decolorization for DMBLR and RBBR. After the decolorization reactions of DMBLR, DMR, and RBBR, it was possible to observe the reduction of Artemia salina mortality and the no significant increase in toxicity for the products generated from DMBBLN.

scholarly journals Degradation of Reactive Dyes by Thermally Activated Persulfate and Reuse of Treated Textile Dye-Bath

2021 ◽  
Author(s):  
Amanda Basilio ◽  
Lucas Dohler ◽  
Matheus Servin ◽  
Carlos Gouvea ◽  
Ronny Ribeiro ◽  
...  
Keyword(s):  
Textile Industry ◽  
Dye Degradation ◽  
Textile Dyes ◽  
Color Removal ◽  
Textile Dye ◽  
Reactive Black 5 ◽  
Thermally Activated ◽  
Good Potential ◽  
High Concentrations ◽  
Activated Persulfate

Due to the usual resistance of textile dyes to conventional biological treatment processes, the color removal of dyeing wastewaters remains a challenge for the textile industry. This work evaluates the capacity of advanced oxidation processes based on thermally-activated persulfate concerning textile dyes’ degradation in aqueous solution and the reuse of dyeing baths. Preliminary studies were carried out in a bench-scale jacketed reactor, using Reactive Black 5 (40 mg L-1) as a model dye. Almost complete dye degradation was observed in 60 min in this stage, using 300 mg L-1 of persulfate and activation temperatures of 80 ºC, basically due to the action of radical sulfate. The use of high concentrations of persulfate (1000 mg L-1) allowed efficient color removal of dyeing baths containing remazol dyes in processes activated at 80 and 90 ºC. However, the wastewaters treated under these conditions did not lead to high dyeing efficiency in reuse studies, probably due to residual persulfate presence. In contrast, low concentrations of persulfate (250 mg L-1) lead to partial color removal and a better dyeing quality. The results suggest a good potential for treating high-temperature dyeing baths, saving water and auxiliary agents used in textile dyeing processes.

scholarly journals Decolorization of Textile Dyes and Degradation of Mono-Azo Dye Amaranth by Acinetobacter calcoaceticus NCIM 2890

2011 ◽  
Vol 51 (4) ◽  
pp. 501-508 ◽  
Author(s):  
Gajanan Ghodake ◽  
Umesh Jadhav ◽  
Dhawal Tamboli ◽  
Anuradha Kagalkar ◽  
Sanjay Govindwar
Keyword(s):  
Azo Dye ◽  
Acinetobacter Calcoaceticus ◽  
Textile Dyes

scholarly journals Biodegradation of Model Azo Dye Methyl Red and other Textile Dyes by Isolate Bacillus circulans NPP1

2016 ◽  
Vol 10 (4) ◽  
pp. 2793-2800 ◽  
Author(s):  
Niranjan Patil ◽  
Avinash Bholay ◽  
Balu Kapadnis ◽  
Vishwas Gaikwad
Keyword(s):  
Azo Dye ◽  
Textile Dyes ◽  
Bacillus Circulans ◽  
Methyl Red

scholarly journals Photodegradation Kinetics and Color Removal of 2-(4-hydroxyphenylazo) Benzoic Acid by Advanced Oxidation Processes

2021 ◽  
pp. 40-49
Author(s):  
Yeliz Karaman ◽  
Emine Baltaci
Keyword(s):  
Hydrogen Peroxide ◽  
Benzoic Acid ◽  
Sodium Hypochlorite ◽  
Ultraviolet Irradiation ◽  
Azo Dye ◽  
Ph Value ◽  
Degradation Kinetics ◽  
Experimental Studies ◽  
Color Removal ◽  
Optimum Ph

Degradation kinetics and color removal of 2-(4-hydroxyphenylazo)benzoic acid azo dye by the hydrogen peroxide/ultraviolet irradiation and sodium hypochlorite/ultraviolet irradiation processes were carried out in Spectroline CM-10A Model ENF-260C/FE photoreactor which has ultraviolet lamps irradiating at 254 and 365 nm wavelengths. All experimental studies were performed at room temperature in 0.04 M Britton Robinson buffer (pH 2-12). For this purpose, the degradation kinetics of 2-(4-hydroxyphenylazo)benzoic acid was investigated depending on pH, initial dye concentration and hydrogen peroxide concentration. Optimum pH and hydrogen peroxide concentration were determined as pH 10 and 3.57x10-2 M, respectively, for 3.5x10-5 M 2-(4-hydroxyphenylazo)benzoic acid. Optimum pH value in 1.55x10-3 M sodium hypochlorite medium has been found as pH 8 for 3.5x10-5 M azo dye. These methods used for degradation of dye are compared, it is concluded that sodium hypochlorite/ultraviolet irradiation and sodium hypochlorite methods are more effective than hydrogen peroxide/ultraviolet irradiation and hydrogen peroxide methods because of color removal of 83% and 64%, respectively.

COLOR REMOVAL OF REACTIVE TEXTILE DYES FROM AQUEOUS SOLUTION BY RAW AND MODIFIED FUNGAL BIOSORBENT

2015 ◽  
Vol 14 (10) ◽  
pp. 2353-2363
Author(s):  
Ahmet Cabuk ◽  
Serap Gedikli ◽  
Pinar Aytar ◽  
Meltem Celikdemir
Keyword(s):  
Aqueous Solution ◽  
Textile Dyes ◽  
Color Removal
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