scholarly journals Kinetic Evaluation of Dye Decolorization by Fenton Processes in the Presence of 3-Hydroxyanthranilic Acid

2019 ◽  
Vol 16 (9) ◽  
pp. 1602 ◽  
Author(s):  
Cássia Sidney Santana ◽  
Márcio Daniel Nicodemos Ramos ◽  
Camila Cristina Vieira Velloso ◽  
André Aguiar
Keyword(s):  
Dye Degradation ◽  
Dye Decolorization ◽  
Redox Mediator ◽  
Phenol Red ◽  
Order Kinetic ◽  
Kinetic Evaluation ◽  
Chromotrope 2R ◽  
Different Temperatures ◽  
Oxidative Processes ◽  
Hydroxyanthranilic Acid

The fungal metabolite 3-hydroxyanthranilic acid (3-HAA) was used as a redox mediator with the aim of increasing dye degradation by Fenton oxidative processes (Fe2+/H2O2, Fe3+/H2O2). Its Fe3+-reducing activity can enhance the generation of reactive oxygen species as HO● radicals. Initially, the influence of 3-HAA on decolorization kinetics of five dyes (methylene blue, chromotrope 2R, methyl orange, phenol red, and safranin T) was investigated using decolorization data from a previous work conducted by the present research group. Fe3+-containing reaction data were well fitted with first-order and mainly second-order kinetic models, whereas the BMG (Behnajady, Modirshahla and Ghanbary) model obtained optimal fit to Fe2+. Improvements in kinetic parameters (i.e., apparent rate constants and maximum oxidation capacity) were observed with the addition of 3-HAA. In another set of experiments, a decrease in apparent activation energy was observed due to introducing 3-HAA into reactions containing either Fe2+ or Fe3+ in order to decolorize phenol red at different temperatures. This indicates that the redox mediator decreases the energy barrier so as to allow reactions to occur. Thus, based on recent experiments and the reaction kinetics models evaluated herein, pro-oxidant properties have been observed for 3-HAA in Fenton processes.

scholarly journals Effect Of Metal Ions On Triphenylmethane Dye Decolorization By Laccase From Trametes Versicolor

2015 ◽  
Vol 14 (2) ◽  
pp. 191-200 ◽  
Author(s):  
Daniela Chmelová ◽  
Miroslav Ondrejovič
Keyword(s):  
Metal Ions ◽  
Trametes Versicolor ◽  
Laccase Activity ◽  
Dye Decolorization ◽  
Redox Mediator ◽  
White Rot ◽  
Bromophenol Blue ◽  
Phenol Red ◽  
Triphenylmethane Dye ◽  
Monovalent Ions

Abstract The aim of this study was investigate the influence of different metal ions on laccase activity and triphenylmethane dye decolorization by laccase from white-rot fungus Trametes versicolor. Laccase activity was inhibited by monovalent ions (Li+, Na+, K+ and Ag+) but the presence of divalent ions increased laccase activity at the concentration of 10 mmol/l. The effect of metal ions on decolorization of triphenylmethane dyes with different structures namely Bromochlorophenol Blue, Bromophenol Blue, Bromocresol Blue and Phenol Red was tested. The presence of metal ions (Na+, K+, Mg2+, Ca2+, Ba2+, Mn2+, Zn2+) slightly decreased triphenylmethane dye decolorization by laccase from T. versicolor except Na+ and Mg2+, which caused the increase of decolorization for all tested dyes. Decolorization of selected dyes showed that the presence of low-molecular-weight compounds is necessary for effective decolorization. Hydroxybenzotriazole (HBT) is the most frequently used. Although HBT belongs to most frequently used redox mediator and generally increase decolorization efficiency, so its presence decreased decolorization percentage of Bromophenol Blue and Bromochlorophenol Blue, the influence of metal ions to dye decolorization by laccase has the similar course with or without presence of redox mediator HBT.

scholarly journals Fast and Effective Catalytic Degradation of an Organic Dye by Eco-friendly Capped ZnS and Mn doped ZnS nanocrystals

2021 ◽  
Author(s):  
Sabri Ouni ◽  
Naim Bel Haj Mohamed ◽  
Noureddine Chaaben ◽  
Adrian Bonilla-Petriciolet ◽  
Mohamed Haouari
Keyword(s):  
Statistical Physics ◽  
Thioglycolic Acid ◽  
Dye Degradation ◽  
Low Cost ◽  
Quantum Confinement Effect ◽  
Dye Adsorption ◽  
Blue Shift ◽  
Order Kinetic ◽  
Zns Nanocrystals ◽  
Mn Doped

Abstract Undoped and Mn-doped ZnS nanocrystals encapsulated with thioglycolic acid were synthetized and characterized with different techniques, and finally tested in the photodegradation of a methyl orange in aqueous solution under UV and sunlight irradiations. FTIR and X-ray diffraction results confirmed the functionalization of these nanocrystals surface by thioglycolic acid and the formation of crystalline structures of ZnS and Mn-doped ZnS with cubic and hexagonal phases. Calculated average size of ZnS nanocrystals was in the range of 2 - 3 nm. It was observed a blue shift of the absorbance threshold and the estimated bandgap energies were higher than that of Bulk ZnS thus confirming the quantum confinement effect of charge carriers. Photoluminescence spectra of ZnS nanocrystals exhibited emission in the range of 410- 490 nm and the appearance of an additional emission band around 580 nm (2.13eV) connected to the 4𝑇1→ 6𝐴1 transition of the Mn2+ions. Photodegradation of methylene orange with undoped and Mn-doped ZnS-TGA nanocrystals was investigated. Dye adsorption prior to photocatalysis using nanocrystals was studied via kinetic experiments and statistical physics models. The maximum dye adsorption capacity on doped ZnS-TGA was ~ 26.98 mg/g. The adsorption kinetic was found to follow the pseudo-second-order kinetic model.According to the statistical physics results, the calculated adsorption energy was 22.47-23.47 kJ/mol and it showed that the dye adsorption was associated to the hydrogen interaction where the removal process was feasible and multi-molecular. The photocatalytic activity of undoped ZnS nanoparticles under UV irradiation showed better efficiency than doped nanocrystals thus indicating that manganese doping generated a dropping of the photocatalytic degradation of the dye. Dye degradation efficiency of 81.37% using ZnS-TGA nanocrystals was achieved after 6 min, which indicated that ZnMnS-TGA nanocrystals may be considered as an alternative low cost and environmental friendly material for facing water pollution caused by organic compounds via photodegradation processes.

scholarly journals Phenol Red Adsorption from Aqueous Solution on the Modified Bentonite

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Nguyen Le My Linh ◽  
Tran Duong ◽  
Hoang Van Duc ◽  
Nguyen Thi Anh Thu ◽  
Pham Khac Lieu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Cetyltrimethylammonium Bromide ◽  
Nitrogen Adsorption ◽  
Isotherm Models ◽  
Phenol Red ◽  
Order Kinetic ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Red Dye ◽  
Adsorption Desorption

In the present work, the modified bentonites were prepared by the modification of bentonite with cetyltrimethylammonium bromide (CTAB), both cetyltrimethylammonium bromide and hydroxy-Fe cations and both cetyltrimethylammonium bromide and hydroxy-Al cations. X-ray diffraction (XRD), thermal analysis (TG-DTA), infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and nitrogen adsorption/desorption isotherms were utilized to characterize the resultant modified bentonites. The modified bentonites were employed for the removal of phenol red dye from aqueous solution. Phenol red adsorption agreed well with the pseudo-second-order kinetic model. The equilibrium data were analyzed on the basis of various adsorption isotherm models, namely, Langmuir, Freundlich, and Dubinin‒Radushkevich models. The highest monolayer adsorption capacity of phenol red at 30°C derived from the Langmuir equation was 166.7 mg·g−1, 125.0 mg·g−1, and 100.0 mg·g−1 for CTAB‒bentonite, Al‒CTAB‒bentonite, and Fe‒CTAB‒bentonite, respectively. Different thermodynamic parameters were calculated, and it was concluded that the adsorption was spontaneous (∆G° < 0) and endothermic (∆H° > 0), with increased entropy (∆S° > 0) in all the investigated temperature ranges.

Synthesis and Characterization of Green Tea Stabilized Iron Nanocatalysts for Brymothymol Blue (BTB) Degradation

2016 ◽  
Vol 42 ◽  
pp. 1-13
Author(s):  
David Mutuku Katithi ◽  
Immaculate N. Michira ◽  
Peterson M. Guto ◽  
Priscilla Gloria Lorraine Baker ◽  
Geoffrey N. Kamau ◽  
...  
Keyword(s):  
Green Tea ◽  
Dye Degradation ◽  
Degradation Kinetics ◽  
Environmental Pollutant ◽  
X Ray Diffraction ◽  
Tunneling Microscopy ◽  
X Ray ◽  
First Order Kinetics ◽  
Different Temperatures

Iron nanoparticles (FeNPs) were prepared from the green tea extracts at different temperatures through green synthesis procedure and characterized by various physicochemical techniques like UV-Visible spectroscopy, FTIR Spectroscopy, energy dispersive X-ray spectrometry (EDS), X-ray diffraction and high resolution tunneling microscopy (HRTEM) and the results confirmed the synthesis of polydisperse and stable FeNPs by the tea extracts. The catalytic activity of FeNPs was investigated using a common environmental pollutant BTB often used in textile industries for dyeing purposes. In these tests, catalytic degradation of BTB with FeNPs at a 10 μL or 30 μL concentration was done in the presence of 2% hydrogen peroxide. Results show no BTB degradation in the absence of the FeNPs. However, a 38% and 68% degradation of BTB was realized in the presence of 10μL and 30 μL FeNPs respectively indicating that the iron nanocatalysts were responsible for the dye degradation. The BTB degradation kinetics was found to follow pseudo-first order kinetics with rate constants at the two catalyst concentrations being 0.023 min-1 and 0.063 min-1 respectively.

Photocatalytic Degradation of Indigo Carmine Dye Using Hydrothermally Synthesized Anatase TiO2 Nanotubes under Ultraviolet Light Emitting Diode Irradiation

2016 ◽  
Vol 855 ◽  
pp. 45-57 ◽  
Author(s):  
Kalithasan Natarajan ◽  
Rukshana I. Kureshy ◽  
Hari C. Bajaj ◽  
Rajesh J. Tayade
Keyword(s):  
Photocatalytic Degradation ◽  
Band Gap ◽  
Organic Dyes ◽  
Light Emitting Diode ◽  
Indigo Carmine ◽  
Order Kinetic ◽  
Light Emitting ◽  
Order Kinetic Model ◽  
Different Temperatures ◽  
Adsorption Desorption

Anatase TiO2 nanotubes (ATNT) was synthesised by hydrothermal method using anatase TiO2 nanoparticles (AT) as precursor and calcined at two different temperatures (250 & 450 °C) for 2 h. The AT and synthesized ATNT photocatalysts were characterized by X-ray diffraction, transmission electron microscopy, N2 adsorption-desorption measurements, UV-vis diffuse reflectance and Fourier Transform Infra-red spectroscopy techniques for their structural, textural and electronic properties. The photocatalytic degradation of Indigo carmine (IC) dye aqueous solution has carried out using ATNT-250 and ATNT-450 photocatalysts under UVLED irradiation. The kinetic analysis has also revealed that the degradation of IC dye solution follows first order kinetic model. The overall study demonstrates the appropriate band gap of the photocatalysts used and the suitable irradiation source which could accelerate the rate of photocatalytic degradation. The band gap of the synthesised ATNT is not much affected due to the change in morphology from nanoparticle to nanotube. The results demonstrated that the irradiation of UV-LED could be utilised for the degradation of organic dyes

Electrical Plasma Technology for Dye Decolorization in a Continuous Reactor System

2013 ◽  
Vol 726-731 ◽  
pp. 2169-2172
Author(s):  
Bo Jiang ◽  
Jing Tang Zheng
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Plasma Reactor ◽  
Dye Decolorization ◽  
Input Voltage ◽  
Continuous Reactor ◽  
Order Kinetic ◽  
Subsequent Reaction ◽  
Initial Ph ◽  
Reaction Column

An airtight gas electrical plasma reactor was designed with subsequent reaction column to estimate performance of this treatment operating in continuous mode for the remediation of wastewater contaminated by organic dye. It was found that subsequent reaction column contributed great for final dye removal because generated ozone was sufficiently utilized in this system and decolorization behaviors in continuous processes were fitted well with first-order kinetic model.And operating under the conditions of input voltage 45kV, gas flow rate 40 L/h, virgin liquid conductivity and unmodified initial pH, the decolorization efficiencies were, at liquid flow rate of 1.5 L/h, 99.7% for 10 mg/L, 99.5% for 20 mg/L, 97.3% for 30 mg/L and 96.7% for 40 mg/L.

scholarly journals Hydrogen Peroxide/Zero Valent Iron/Persulfate Approach for Dye Degradation: Key Operating Parameter and Synergistic Effect

2021 ◽  
Author(s):  
Mehdi Ahmadi ◽  
rozhan feizi
Keyword(s):  
Hydrogen Peroxide ◽  
Dye Degradation ◽  
Operating Parameter ◽  
Zero Valent Iron ◽  
Reusable Catalyst ◽  
Aqueous Environment ◽  
Order Kinetic ◽  
Operational Parameters ◽  
Sunset Yellow ◽  
Solution Ph

Abstract Azo dyes due to the presence of benzene ring, toxicity, mutagenicity, carcinogenicity and low biodegradability have become a major problem in the aqueous environment. In this study, Zero Valent Iron (ZVI) was employed as a catalyst to activate persulfate (PS) and hydrogen peroxide (H2O2) for removal of Sunset Yellow (SY) from aqueous solutions using integrated H2O2/ZVI/PS process. The effects of operational parameters (solution pH, H2O2 concentration, PS concentration, and ZVI dose) were studied on SY removal. According to the results, about 100% efficiency was obtained by the H2O2/ZVI/PS for dye removal at: pH = 3, ZVI 50 mg/L, 1 mM H2O2 concentration, 1 mM PS concentration, and 30 min reaction time. The kinetic study implied that the H2O2/ZVI/PS process followed the first-order kinetic model. The total organic carbon (TOC) test showed that about 65% of mineralization was achieved after 30 min. Moreover, the ZVI particles showed a suitable efficiency after five cycles, and hence, it can be used as an eco-friendly, cost effective and reusable catalyst for the treatment of wastewaters contaminated with such dyes.

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 Biosorption of cationic and anionic dyes using the biomass of Aspergillus parasiticus CBS 100926T

2021 ◽  
Author(s):  
Hadj Daoud Bouras ◽  
Ahmed RédaYeddou ◽  
Noureddine Bouras ◽  
Abdelmalek Chergui ◽  
Lidia Favier ◽  
...  
Keyword(s):  
Aspergillus Parasiticus ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Isotherm Models ◽  
Phenol Red ◽  
Order Kinetic ◽  
Acid Dyes ◽  
Anionic Dyes ◽  
Adsorption Processes ◽  
Pseudo Second Order

Aspergillus parasiticus (A. parasiticus) CBS 100926T was used as a biosorbent for the removal of Methylene Blue (MB), Congo Red (CR), Sudan Black (SB), Malachite Green Oxalate (MGO), Basic Fuchsin (BF) and Phenol Red (PR) from aqueous solutions. The batch biosorption studies were carried out as a function of dye concentration and contact time. The biosorption process followed the pseudo-first-order and the pseudo-second-order kinetic models and the Freundlich and Langmuir isotherm models. The resulting biosorbent was characterized by Scanning Electron Microscopy (SEM), X-Ray Diffractometer and Fourier Transformer Infrared Spectroscopy (FTIR) techniques. The results of the present investigation suggest that A. parasiticus can be used as an environmentally benign and low cost biomaterial for the removal of basic and acid dyes from aqueous solution. HIGHLIGHTS Micro-fungi Aspergillus parasiticus CBS100926T was employed as a new biosorbent for the biosorption of six dyes. The maximum dye capacity was found to be 131.58 mg/g. Adsorption processes can reach equilibrium within 120 min. Adsorption processes follow the pseudo-second-order rate equation. The results of equilibrium sorption were described through Freundlich isotherm.

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