Degradation of Crystal Violet Dye by Fenton and Photo-Fenton Oxidation Processes

2018 ◽  
Vol 232 (12) ◽  
pp. 1771-1786 ◽  
Author(s):  
Faiza Rehman ◽  
Murtaza Sayed ◽  
Javed Ali Khan ◽  
Luqman Ali Shah ◽  
Noor S. Shah ◽  
...  
Keyword(s):  
Ion Chromatography ◽  
Crystal Violet ◽  
Aqueous Media ◽  
Oxidative Degradation ◽  
Order Rate Constant ◽  
Oh Radical ◽  
Fenton Process ◽  
Operational Parameters ◽  
Oxidation Processes ◽  
Crystal Violet Dye

Abstract The oxidative degradation of CV dye in aqueous media has been evaluated using Fenton (Fe2+/H2O2) and photo-Fenton (Fe2+/H2O2/UV) processes. Various operational parameters like H2O2 dosages, Fe2+ dosages and [CV]0 were optimized of both Fenton and photo-Fenton processes for the removal of CV dye from aqueous media. Kinetic results indicated that photo-Fenton process (kobs=0.0097 min−1, t1/2=71.45 min) is more effective than Fenton process (kobs=0.0074 min−1, t1/2=93.66 min). Second order rate constant of ˙OH radical with CV dye was calculated to be 3.96×109 M−1s−1. De-methylated organic intermediates of CV dye detected by LC-MS and some other intermediates like CH3COO−, HCOO−, NH4+ and Cl− were identified by ion-chromatography.

The fate of peroxyl radicals in aqueous solution

1997 ◽  
Vol 35 (4) ◽  
pp. 9-15 ◽  
Author(s):  
Clemens von Sonntag ◽  
Peter Dowideit ◽  
Fang Xingwang ◽  
Ralf Mertens ◽  
Pan Xianming ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Aromatic Compounds ◽  
Advanced Oxidation Processes ◽  
Room Temperature ◽  
Oxidative Degradation ◽  
High Reactivity ◽  
Peroxyl Radicals ◽  
Oh Radical ◽  
Oxidation Processes ◽  
Water And Wastewater

The reactions of peroxyl radicals occupy a central role in oxidative degradation. Under the term Advanced Oxidation Processes in drinking-water and wastewater processing, procedures are summarized that are based on the formation and high reactivity of the OH radical. These react with organic matter (DOC). With O2, the resulting carbon-centered radicals O2 give rise to the corresponding peroxyl radicals. This reaction is irreversible in most cases. An exception is hydroxycyclohexadienyl radicals which are formed from aromatic compounds, where reversibility is observed even at room temperature. Peroxyl radicals with strongly electron-donating substituents eliminate O2.−, those with an OH-group in a-position HO2.. Otherwise organic peroxyl radicals decay bimolecularly. The tetroxides formed in the first step are very short-lived intermediates and decay by various pathways, leading to molecular products (alcohols, ketones, esters and acids, depending on the precursor), or to oxyl radicals, which either fragment by scission of a neighbouring C-C bond or, when they carry an a-hydrogen, undergo a (water-assisted) 1,2-H-shift.

Crystal Violet Dye Removal from Aqueous Solutions Using Elodea Canadensis as Biofilter

2017 ◽  
Vol 68 (10) ◽  
pp. 2270-275
Author(s):  
Anamaria Torok ◽  
Boldizsar Nagy ◽  
Szende Tonk ◽  
Erzsebet Buta ◽  
Robert Szep ◽  
...  
Keyword(s):  
Crystal Violet ◽  
Stress Responses ◽  
Active Sites ◽  
Aquatic Plant ◽  
Freundlich Isotherm ◽  
Elodea Canadensis ◽  
Second Order ◽  
Order Kinetic ◽  
Operational Parameters ◽  
Crystal Violet Dye

The phytoremediation of Crystal violet dye was developed using the aquatic plant Elodea canadensis as biofilter. We analyzed the role of functional groups in phytoremediation by aquatic plants using the Fourier transform infrared spectroscopy (FTIR). The aquatic plant�s abiotic stress responses were evaluated under exposure of 20 - 90 mg/L initial dye concentration, where a significant decrease of the photosynthetic pigments content suggests the plant�s biosynthesis deregulation at higher concentrations. We determined the effect of operational parameters such as contact time, plant quantity initial concentration, initial pH and temperature on the removal efficiency. Data were analysed using the kinetic (pseudo-first- and second-order) and isotherm (Langmuir, Freundlich and Dubinin-Radushkevich) models. Our results show that the phytoremediation process follows the pseudo-second-order kinetic model, meaning that it takes places as chemisorption. The Crystal violet uptake was successfully described using the Freundlich isotherm model as a multilayer adsorption with heterogeneous energetic distribution of active sites.

Oxidative degradation and mineralization of the phenylurea herbicide fluometuron in aqueous media by the electro-Fenton process

2017 ◽  
Vol 186 ◽  
pp. 197-206 ◽  
Author(s):  
Pape Abdoulaye Diaw ◽  
Nihal Oturan ◽  
Mame Diabou Gaye Seye ◽  
Atanasse Coly ◽  
Alponse Tine ◽  
...  
Keyword(s):  
Aqueous Media ◽  
Oxidative Degradation ◽  
Fenton Process ◽  
Phenylurea Herbicide

ADSORPTION OF CRYSTAL VIOLET DYE FROM AQUEOUS MEDIA BY ALGERIAN CLAY: STUDIES ON EQUILIBRIUM ISOTHERM, KINETIC AND THERMODYNAMIC OF INTERACTION

2021 ◽  
Vol 77 (9) ◽  
Author(s):  
Rania Remmani ◽  
Dámaris Núñez-Gómez ◽  
Rachid Makhloufi ◽  
Malek Miladi ◽  
Naim Sezgin ◽  
...  
Keyword(s):  
Crystal Violet ◽  
Aqueous Media ◽  
Equilibrium Isotherm ◽  
Crystal Violet Dye

scholarly journals The effect of operational parameters on decolourisation of textile dyes and comparison efficiencies of the UV/H2O2, fenton and photo-fenton processes: A review

2017 ◽  
Vol 15 (1) ◽  
pp. 23-34
Author(s):  
Slobodan Najdanovic ◽  
Jelena Mitrovic ◽  
Aleksandra Zarubica ◽  
Aleksandar Bojic
Keyword(s):  
Advanced Oxidation Processes ◽  
Current Knowledge ◽  
Advanced Oxidation ◽  
Review Article ◽  
Textile Dyes ◽  
H2o2 Concentration ◽  
Fenton Process ◽  
Operational Parameters ◽  
Oxidation Processes ◽  
Initial Ph

In this review article, we summarize the current knowledge about the applicability of advanced oxidation processes (AOPs) such as UV/H2O2, Fenton and photo-Fenton for removal of textile dyes from wastewater and the effect of operational parameters (initial dye concentration, initial H2O2 concentration, initial Fe2+ concentration and initial pH) on these processes. Numerous studies have reported the use of AOPs for degradation of textile dyes, and the results show that they are very effective. By comparing the results of the previous studies, it seems that the photo- Fenton process is more efficient than the Fenton and UV/H2O2 process.

scholarly journals Application of the Natural Cellulosic Supports for the Treatment of the Industrial Effluents

2021 ◽  
Vol 44 (3) ◽  
pp. 48-55
Author(s):  
Andreea BONDAREV
Keyword(s):  
Aqueous Solutions ◽  
Crystal Violet ◽  
Dye Removal ◽  
Agricultural Waste ◽  
Beech Wood ◽  
Aqueous Media ◽  
Industrial Effluents ◽  
Chemically Modified ◽  
Wood Sawdust ◽  
Crystal Violet Dye

Wastewater treatment is one of the most important concerns of the research studies in the field of environmental protection. The current study relates to the removal of Crystal violet dye from aqueous solutions through adsorption experiments onto natural cellulosic supports. Various waste materials that have in their composition lignocellulose are adsorbent supports with low costs for the removal of heavy metal ions and dyes from aqueous solutions. The use of chemically modified sawdust to obtain an inexpensive adsorbent for removing the Crystal violet dye (CV) from synthetic aqueous solutions has been presented in this research paper. The influence of some important parameters such as: initial dye concentration, adsorbent dose, contact time and temperature on adsorption efficiency for this dye removal have been studied. The Freundlich, Langmuir and Temkin mathematical models have been used to evaluate the data of Crystal violet adsorption from aqueous media using wood sawdust. The research study shows that beech wood sawdust (Fagus sylvatica), as an agricultural waste which is readily available and relatively inexpensive has the potential to be an applicable alternative adsorbent for Crystal violet dye removal from industrial effluents.

scholarly journals Synthesis and characterization of arginine-doped heliotrope leaves with high clean-up capacity for crystal violet dye from aqueous media

2021 ◽  
Author(s):  
Lahoucine Brini ◽  
Abdelghani Hsini ◽  
Yassine Naciri ◽  
Asmae Bouziani ◽  
Zeeshan Ajmal ◽  
...  
Keyword(s):  
Crystal Violet ◽  
Contact Time ◽  
Fourier Transforms ◽  
Low Cost ◽  
Aqueous Media ◽  
Dye Adsorption ◽  
Batch Process ◽  
Scanning Calorimetry ◽  
Crystal Violet Dye ◽  
Ft Ir

Abstract Novel an arginine-modified Heliotrope leaf (Arg@HL) was used as adsorbent for the crystal violet (CV) dye adsorption in a batch process. The physicochemical and morphological composition of Arg@HL were characterized by field-emission-scanning-electron-microscopy (FE-SEM), Fourier transforms infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC). The experiments were carried out to investigate the factors that influence the dye uptake by the adsorbent, such as the contact time under agitation, adsorbent amount, initial dye concentration, temperature and pH of dye solution. The optimum conditions of adsorption were found on the batch scale as followed: CV concentration of 20 mg·L−1, an amount of 0.75 g·L−1 of the adsorbent, 90 min contact time, 6 pH and 25 °C temperature for Arg@HL. The results confirmed a second-order model explaining the dye crystal violet's adsorption's kinetics by Arg-Heliotrope leaves. The Langmuir model effectively defines the adsorption isotherms. The results revealed that the Arg@HL has the potential to be used as a low-cost adsorbent for the removal of CV dye from aqueous solutions.

On-Demand Guest Release from MOF-5 Sealed with Nitrophenylacetic Acid Photocapping Groups

2019 ◽  
Author(s):  
Jingjing Yan ◽  
Rick Homan ◽  
Corrianna Boucher ◽  
Prem N. Basa ◽  
Katherine Fossum ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Crystal Violet ◽  
Dye Molecules ◽  
Phenyl Acetic Acid ◽  
On Demand ◽  
Crystal Violet Dye ◽  
Dye Diffusion ◽  
Triphenylacetic Acid

Recently, we demonstrated that triphenylacetic acid could be used to seal dye molecules within MOF-5, but guest release required digestion of the framework by treatment with acid. We prepared the sterically bulky photocapping group [bis-(3-nitro-benzyl)-amino]-(3-nitro-phenyl)-acetic acid (PC1) can prevent Crystal violet dye diffusion from inside MOF-5 until removed by photolysis.

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