scholarly journals Exploiting the Potential of Supported Magnetic Nanomaterials as Fenton-like Catalysts for Environmental Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2902
Author(s):  
Jorge González-Rodríguez ◽  
María Gamallo ◽  
Julio J. Conde ◽  
Zulema Vargas-Osorio ◽  
Carlos Vázquez-Vázquez ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Dye Degradation ◽  
Silica Matrix ◽  
Emerging Pollutants ◽  
Magnetic Nanomaterials ◽  
Iron Hydroxides ◽  
Nanoparticle Coating ◽  
Degradation Of Dyes ◽  
Treated Effluent ◽  
Operational Variables

In recent years, the application of magnetic nanoparticles as alternative catalysts to conventional Fenton processes has been investigated for the removal of emerging pollutants in wastewater. While this type of catalyst reduces the release of iron hydroxides with the treated effluent, it also presents certain disadvantages, such as slower reaction kinetics associated with the availability of iron and mass transfer limitations. To overcome these drawbacks, the functionalization of the nanocatalyst surface through the addition of coatings such as polyacrylic acid (PAA) and their immobilization on a mesoporous silica matrix (SBA15) can be factors that improve the dispersion and stability of the nanoparticles. Under these premises, the performance of the nanoparticle coating and nanoparticle-mesoporous matrix binomials in the degradation of dyes as examples of recalcitrant compounds were evaluated. Based on the outcomes of dye degradation by the different functionalized nanocatalysts and nanocomposites, the nanoparticles embedded in a mesoporous matrix were applied for the removal of estrogens (E1, E2, EE2), accomplishing high removal percentages (above 90%) after the optimization of the operational variables. With the feasibility of their recovery in mind, the nanostructured materials represented a significant advantage as their magnetic character allows their separation for reuse in different successive sequential batch cycles.

scholarly journals Tribocatalytic degradation of dyes by tungsten bronze ferroelectric Ba2.5Sr2.5Nb8Ta2O30 submicron particles

RSC Advances ◽  
2021 ◽  
Vol 11 (22) ◽  
pp. 13386-13395
Author(s):  
Chaozhong Sun ◽  
Xiaoying Guo ◽  
Changzheng Hu ◽  
Laijun Liu ◽  
Liang Fang ◽  
...  
Keyword(s):  
Environmental Remediation ◽  
Dye Degradation ◽  
Tungsten Bronze ◽  
Submicron Particles ◽  
New Approach ◽  
Degradation Of Dyes

Searching for a new approach in environmental remediation in terms of dye degradation is important in industrialized society.

Electrogeneration of Active Chlorine in a Filter-Press-Type Reactor Using a New Sb2O5 Doped Ti/RuO2-ZrO2 Electrode: Indirect Indigoid Dye Oxidation

2017 ◽  
Vol 15 (2) ◽  
Author(s):  
Francisca A. Rodríguez ◽  
Eligio P. Rivero ◽  
Ignacio González
Keyword(s):  
Mass Transfer ◽  
Dye Degradation ◽  
Indigo Carmine ◽  
Chloride Concentration ◽  
Electrochemical Reactor ◽  
Filter Press ◽  
Active Chlorine ◽  
Visible Absorption ◽  
First Order Kinetics

Abstract This paper presents the study on active chlorine mediated electrochemical oxidation of model solutions that simulate textile effluents containing an indigoid dye (indigo carmine) and sodium chloride (0.05 M) using a new Sb2O5-doped Ti/RuO2-ZrO2 electrode. The study was carried out in a filter-press electrochemical reactor specially designed to minimize flow deviations and provide homogeneous mass transfer flux over the electrode surface. Firstly, the mass-transfer-limited chloride oxidation reaction was studied in the absence of dye in order to understand the active chlorine formation process. Changes in pH, chloride concentration and UV-visible absorption spectra during electrolysis reveal the formation of active chlorine (mainly hypochlorite) with current efficiencies for chloride oxidation of 0.558 and 0.503 at 10 and 20 mA cm−2, respectively. Secondly, chloride oxidation was investigated in the presence of indigo carmine dye (0.5 mM) where in-situ generated active chlorine was responsible for -C=C- bond breaking and dye degradation. The solution discoloration followed a pseudo-first order kinetics where kinetic coefficient was inversely proportional to dye concentration. The oxidation with active chlorine had an average efficiency of 0.7 and a very competitive energy consumption between 49.2 and 128.5 kW h (kg COD removed)−1 depending on current density and flow rate.

scholarly journals Kinetic and ecotoxicological evaluation of the direct orange 26 dye degradation by Fenton and solar photo-Fenton processes

2018 ◽  
Vol 22 ◽  
pp. 5 ◽  
Author(s):  
Rayany Magali da Rocha Santana ◽  
Graziele Elisandra do Nascimento ◽  
Polyana Karynne de Aguiar Silva ◽  
Alex Leandro Andrade de Lucena ◽  
Thamara Figueiredo Procópio ◽  
...  
Keyword(s):  
Working Conditions ◽  
Dye Degradation ◽  
Oxygen Demand ◽  
Kinetic Studies ◽  
Textile Dye ◽  
Degradation Of Dyes ◽  
Ecotoxicological Evaluation ◽  
Portulaca Grandiflora ◽  
Oxidative Processes ◽  
Nonlinear Kinetic

The presence of color in textile effluents has been studied because of the need for more effective treatments. Therefore, advanced oxidative processes (AOP) have been used in the degradation of dyes, as well as in the conversion of organic matter. This study evaluated the degradation of the direct orange 26 textile dye by Fenton and photo-Fenton processes (with natural solar radiation). A statistical analysis, based on factorial 23 indicated the best working conditions, being: [H2O2] = 100 mg·L-1 and pH 3-4, for both AOP in that the [Fe] =  1 e 5 mg·L-1, for photo-Fenton and Fenton, respectively. The results of the kinetic studies demonstrated a good fit to the nonlinear kinetic model proposed by Chan and Chu, with values of R2 > 0,996 (photo-fenton) and R2 > 0,939 (Fenton). The tests performed to evaluate the chemical oxygen demand indicated conversions of 62.05% (Fenton) and 66.41% (photo-Fenton). Finally, the ecotoxicity study indicated that the post-treatment samples were non-toxic to the bacteria Escherichia coli and Proteus mirabilis but showed growth inhibition for Lactuca sativa (Fenton and photo-Fenton) seeds and for Brassica juncea and Portulaca grandiflora (Fenton).

scholarly journals Microwave-assisted hydrothermal synthesis of chrysanthemum-like Ag/ZnO prismatic nanorods and their photocatalytic properties with multiple modes for dye degradation and hydrogen production

RSC Advances ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 6027-6038 ◽  
Author(s):  
Zichan Xin ◽  
Li Li ◽  
Xiuli Zhang ◽  
Wenzhi Zhang
Keyword(s):  
Hydrothermal Synthesis ◽  
Hydrogen Production ◽  
Photocatalytic Degradation ◽  
Dye Degradation ◽  
Photocatalytic Properties ◽  
Multiple Modes ◽  
Microwave Assisted ◽  
Degradation Of Dyes

A series of chrysanthemum-like composites Ag/ZnO were prepared by the microwave-assisted hydrothermal synthesis, which well showed the ability of photocatalytic degradation of dyes and hydrogen production.

Silver nanoparticles: facile synthesis and their catalytic application for the degradation of dyes

RSC Advances ◽  
2015 ◽  
Vol 5 (33) ◽  
pp. 25781-25788 ◽  
Author(s):  
Kamaldeep Sharma ◽  
Gurpreet Singh ◽  
Gurpreet Singh ◽  
Manoj Kumar ◽  
Vandana Bhalla
Keyword(s):  
Room Temperature ◽  
Dye Degradation ◽  
Catalytic Efficiency ◽  
Organic Dye ◽  
Facile Synthesis ◽  
Catalytic Application ◽  
Degradation Of Dyes ◽  
Organic Dye Degradation ◽  
Aldehyde Groups

The aggregates of pentacenequinone, HPB and PDI derivatives 3, 5 and 7 having aldehyde groups bind strongly with Ag+ and serve as reactors and stabilizers for the preparation of AgNPs at room temperature. In situ generated AgNPs show high catalytic efficiency for industrially important organic dye degradation.

Removal of hydrophobic dyestuff from dyeing wastewater by photo-sensitization process

2001 ◽  
Vol 43 (2) ◽  
pp. 305-312
Author(s):  
S. M. Tsui ◽  
W. Chu ◽  
P. C. Fung ◽  
K. M. Sin
Keyword(s):  
Photochemical Reaction ◽  
Dye Degradation ◽  
Solvent System ◽  
Quantum Yields ◽  
Dyeing Wastewater ◽  
Solution Ph ◽  
Treatment Processes ◽  
Treated Effluent ◽  
Acetone Water ◽  
Water Ratio

Recently, photochemical reaction became more important in view of using UV in textile dyeing wastewater treatment processes, in which neither chemical sludges nor toxic residues are left in the treated effluent. The photodegradation of hydrophobic dye (Palanil Yellow 5R, PY-5R) in the presence of acetone, which performs as a solvent and/or a photo-sensitizer, was investigated in this study. The results demonstrated that photochemical reaction in the presence of acetone could rapidly and effectively enhance color removal at a wavelength of 253.7 nm. The photodegradation follows pseudo first-order decay. The rate constants and decay quantum yields of dye degradation by UV depend on the solution pH and solvent system, (i.e., acetone to water ratio). The photosensitization of the disperse dye was found to be optimized at pH 9 and in 0.5 (v:v) acetone-water ratio.

Kinetic and thermodynamic studies for evaluation of adsorption capacity of fungal dead biomass for direct dye

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Asma Hassan ◽  
Haq Nawaz Bhatti ◽  
Munawar Iqbal ◽  
Arif Nazir
Keyword(s):  
Dye Degradation ◽  
Carbon Sources ◽  
Industrial Effluents ◽  
Nitrogen Sources ◽  
White Rot ◽  
White Rot Fungus ◽  
Dead Biomass ◽  
Degradation Of Dyes ◽  
Freundlich Adsorption Isotherm ◽  
Pseudo Second Order

AbstractThis study focuses on evaluation of degradation aptitude of white rot fungus (Coriolus versicolor) against Indosol Turquoise FBL dye. The outcome of numerous parameters including pH, temperature, carbon sources, nitrogen sources, C/N ratio and effect of dye concentration were studied. Maximum decolorization (99.896%) of Indosol Turquoise FBL was obtained by C. versicolor under optimized conditions. After three days, the maximum dye degradation (98%) was observed at pH 4 and 30 °C. Six carbon sources fructose, glucose, maltose, sucrose, rice bran and wheat bran were used and 96.66% degradation was observed by maltose at its optimum growth concentration (0.1 g/100 mL). Various nitrogen sources were employed for decolorization but ammonium nitrate decolorized dye up to 98.05%. The activity of three different enzymes laccase, Lignin peroxidase (LiP) and Manganese peroxidase (MnP) were calculated. The dead biomass of White rot fungus (WRF) was used for biosorption experiments. Maximum q (36 mg/g) was obtained at pH 2, at 30 °C using 0.05 g biosorbent. An increase in the q value was observed with increase in dye concentration. Freundlich adsorption isotherm and pseudo second order kinetics were followed by the data. It can be concluded that C. versicolor could be an efficient source for degradation of dyes from industrial effluents.

scholarly journals Transition Metal Oxides and Their Composites for Photocatalytic Dye Degradation

2021 ◽  
Vol 5 (3) ◽  
pp. 82
Author(s):  
Preety Ahuja ◽  
Sanjeev Kumar Ujjain ◽  
Rajni Kanojia ◽  
Pankaj Attri
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Dye Degradation ◽  
Carbon Composites ◽  
Dye Sensitization ◽  
Degradation Of Dyes ◽  
Flexible Surface ◽  
Photocatalytic Dye Degradation ◽  
Future Utilization

Transition metal oxides (TMO) and their carbon composites have become a glittering upcoming material science candidate. Their interesting properties, such as their meticulous morphology, plentiful availability, flexible surface chemistry along with outstanding mechanical, thermal, and optical properties make them ideal for efficient photocatalytic dye degradation. An extensive range of TMO, and their carbon composites are reviewed highlighting the progression and opportunities for the photocatalytic degradation of dyes. Here, we concisely describe the numerous techniques to extend the optical absorption of these TMOs involving dye sensitization, metal doping, etc. Besides this, an overview of all aspects of dye degradation along with the prevailing challenges for future utilization and development of such nanocomposites towards highly efficient dye degradation system are also reported.

scholarly journals An overview to photo-catalytic degradation of dyes in waste water

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Mohd Hanief Najar ◽  
Ishtiyaq Ahmed Najar
Keyword(s):  
Waste Water ◽  
Environmental Remediation ◽  
Organic Dyes ◽  
Dye Degradation ◽  
Environmentally Benign ◽  
Nano Composites ◽  
High Toxicity ◽  
Food Industries ◽  
Degradation Of Dyes ◽  
Carcinogenic Effects

Organic dyes used in textile and food industries are the important sources of environmental contaminations due to their non-bio degradability and high toxicity to aquatic creatures and carcinogenic effects on humans. This demands environmental remediation by the use of techniques which are environmentally benign. For this purpose, a general overview of dye degradation by light in the presence of materials as photo-catalysts has been given. The mechanism of action has also been described. Importantly, the materials involved in dye degradation usually involve nano-composites of either conducting polymers or metal-oxidesor graphene based systems which are insoluble in aqueous solutions, hence will be environmentally benign and can therefore be recovered after use.

Facile Synthesis of CuO Semiconductor Nanorods for Time Dependent Study of Dye Degradation and Bioremediation Applications

2017 ◽  
Vol 46 ◽  
pp. 154-164 ◽  
Author(s):  
Gurjinder Singh ◽  
Sudhakar Panday ◽  
Mohit Rawat ◽  
Deepak Kukkar ◽  
Soumen Basu
Keyword(s):  
Dye Degradation ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Spectroscopic Characterization ◽  
Great Promise ◽  
Methylene Orange ◽  
Degradation Of Dyes ◽  
Bio Monitoring ◽  
One Step ◽  
Lower Diffusion

The manuscript reports facile one step synthesis of CuO semiconductor nanorods by sol-gel aaproach for photocatalytic and bioremediation applications. Spectroscopic characterization along with X-ray diffractometry and electron microscopy studies confirmed the formation of nanorods with 12 to 14 nm diameter and 50-100 nm length. As synthesized nanorods were subjected to photocatalytic degradation of dyes viz. Methylene Orange (MO), Methylene Blue (MB), Eriochrome Black T (ET) and Congo Red (CR) in a time bound study. Comparative analysis of the data depicted that time taken for degradation of equal amount of CR was more compared to the other three dyes owing to its high molecular weight and lower diffusion rate in aqueous medium. Subsequently, the antibacterial properties of the nanorods were investigated against the gram negative Escherichia coli and gram positive Bacillus bacteria. Zone of clearance was observed in disk diffusion assays, thereby confirming the antibacterial characteristics of the nanorods. These nanorods thus hold great promise as a simple, selective and a sensitive analytical platform for the effective bio-monitoring and photocatalyst for dye degradation.

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