Decolourization of Alizarin Red by Persulfate

2012 ◽  
Vol 610-613 ◽  
pp. 300-305
Author(s):  
Shen Xin Li ◽  
Wei Hu ◽  
Cheng Duan Wang
Keyword(s):  
Ionic Strength ◽  
Uv Irradiation ◽  
Degradation Products ◽  
Kinetics Model ◽  
Dye Wastewater ◽  
Alizarin Red ◽  
First Order ◽  
First Order Kinetics ◽  
Pseudo First Order

The decolourization of dye wastewater by persulfate was studied using alizarin red as a model dye wastewater. Effects of several parameters, such as dose of oxidant, ionic strength, pH, temperature and UV irradiation, were investigated in detail. The results showed that the decolourization reaction of alizarin red by persulfate could be fitted to a pseudo-first order kinetics model. In addition, no degradation products were observed during the decolourization of alizarin red by persulfate. The results are useful for the treatment of dye wastewater.

Decolourization of Methylene Blue by Persulfate

2013 ◽  
Vol 634-638 ◽  
pp. 76-80
Author(s):  
Wei Hu ◽  
Shen Xin Li ◽  
Cheng Duan Wang
Keyword(s):  
Methylene Blue ◽  
Ionic Strength ◽  
Uv Irradiation ◽  
Reaction Temperature ◽  
Uv Light ◽  
Kinetics Model ◽  
Dye Wastewater ◽  
First Order ◽  
First Order Kinetics ◽  
Pseudo First Order

The decolourization of dye wastewater by persulfate was studied using methylene blue as a model dye wastewater. Effects of several parameters, such as dose of oxidant, ionic strength, pH, temperature and UV irradiation, were investigated in detail. The results showed that the decolourization reaction of methylene blue by persulfate could be fitted to a pseudo-first order kinetics model. In addition, when the oxidant amount used is 2 times of methylene blue, pH 3.43 and reaction temperature for 60°C, after uv light under the irradiation of 20 min, methylene blue decolorization rate can reach more than 98%. The results are useful for the treatment of dye wastewater.

Decolourization of Kiscolon Scarlet 2KN by Persulfate

2013 ◽  
Vol 864-867 ◽  
pp. 256-260
Author(s):  
Wei Hu ◽  
Shen Xin Li ◽  
Wang Ying ◽  
Cheng Duan Wang
Keyword(s):  
Uv Irradiation ◽  
Reaction Temperature ◽  
Kinetics Model ◽  
Dye Wastewater ◽  
First Order ◽  
Decolorization Rate ◽  
First Order Kinetics ◽  
Pseudo First Order

The decolourization of dye wastewater by persulfate was studied using kiscolon scarlet2KN as a model dye wastewater. Effects of several parameters, such as dose of oxidant, pH, temperature and UV irradiation, were investigated in detail. The results showed that the decolourization reaction of kiscolon scarlet2KN by persulfate could be fitted to a pseudo-first order kinetics model. In addition, when the oxidant amount used is 70 times of kiscolon scarlet2KN, pH 5.71 and reaction temperature for 70°C, kiscolon scarlet2KN decolorization rate can reach more than 98%. The results are useful for the treatment of dye wastewater.Keywords:Kiscolon scarlet 2KN, Decolourization, Persulfate

New insights on the UV/TiO2 photocatalytic treatment of thiomersal and its 2-sulfobenzoic acid product

2021 ◽  
Vol 02 ◽  
Author(s):  
Emmanuel M. de la Fournière ◽  
Jorge M. Meichtry ◽  
Graciela S. Custo ◽  
Eduardo A. Gautier ◽  
Marta I. Litter
Keyword(s):  
Degradation Products ◽  
Acidic Ph ◽  
Cosmetic Products ◽  
Acid Product ◽  
First Order ◽  
First Order Kinetics ◽  
Photocatalytic Destruction ◽  
Pseudo First Order ◽  
Mineralization Degree ◽  
Suitable Technique

Background: Thiomersal (TM), a complex between 2-mercaptobenzoic acid (2-MBA) and ethylmercury (C2H5Hg+), is an antimicrobial preservative used in immunological, ophthalmic, cosmetic products, and vaccines. Objective: TM has been treated by UV/TiO2 photocatalysis in the presence or absence of oxygen at acidic pH. C2H5Hg+, 2-MBA, and 2-sulfobenzoic acid (2-SBA) were found as products. A 2-SBA photocatalytic treatment was undertaken to study sulfur evolution. Methods: Photocatalytic runs were performed using a UVA lamp (λmax = 352 nm), open to the air or under N2. A suspension of the corresponding TM or 2-SBA salt and TiO2 was prepared, and pH was adjusted. Suspensions were stirred in the dark for 30 min and then irradiated. TM, 2-MBA, 2-SBA, and C2H5Hg+ were quantified by HPLC, sulfur by TXRF, and the deposits on the photocatalyst were analyzed by chemical reactions. The mineralization degree was followed by TOC. Sulfate was determined using BaCl2 at 580 nm. Results: Photocatalytic destruction of TM and total C2H5Hg+ was complete under N2 and air, but TM degradation was much faster in air. The evolution of TM and the products followed a pseudo-first-order kinetics. Conclusion: TiO2-photocatalytic degradation is a suitable technique for the treatment of TM and its degradation products. In contrast to other organomercurial compounds, TM degradation is faster in the presence of O2, indicating that the oxidative mechanism is the preferred pathway. A significant TM mineralization (> 60%, NPOC and total S) was obtained. TM was more easily degraded than 2-SBA. Sulfate was the final product.

Decolorization and degradation of reactive dye during the dyed cotton fabric rinsing process

2010 ◽  
Vol 62 (4) ◽  
pp. 766-775 ◽  
Author(s):  
Deng-Hong Luo ◽  
Qing-Kang Zheng ◽  
Sheng Chen ◽  
Qing-Shu Liu ◽  
Xiu-Xing Wang ◽  
...  
Keyword(s):  
Reactive Dye ◽  
Dye Wastewater ◽  
Molecular Fragments ◽  
Active Oxidation ◽  
First Order ◽  
Dyeing Process ◽  
First Order Kinetics ◽  
Pseudo First Order ◽  
Colored Wastewater ◽  
Decolorization Kinetics

Dyeing process of textile consumes large quantities of water, which results in huge amounts of colored wastewater. Most of the dye wastewater treating methods focused on the treatment of wastewater after the rinsing process of dyed textile. In this paper, tetraacetylethylenediamine/hydrogen peroxide (TAED/H2O2) active oxidation (AO) system was developed to rinse dyed textile and decolorize the rinsing wastewater simultaneously. The results indicated that the decolorization ratio of the rinse effluent obtained by AO method were in the range of 51.72%–84.15% according to different dyes and the COD value decreased more than 30% compared with that of traditional rinsing process. The decolorization kinetics investigation showed that the decolorization of dyes during AO rinsing process followed the law of pseudo-first order kinetics. The result of UV-Vis and UPLC-MS analysis demonstrated that the dye was degraded into colorless organic molecular fragments and partly mineralized during the AO rinsing process.

Efficient degradation of tetracycline by ultraviolet-based activation of peroxymonosulfate and persulfate

2019 ◽  
Vol 79 (5) ◽  
pp. 911-920 ◽  
Author(s):  
Jiamin Hu ◽  
Jing Zhang ◽  
Qingguo Wang ◽  
Qian Ye ◽  
Hao Xu ◽  
...  
Keyword(s):  
Degradation Kinetics ◽  
Oxidative Capacity ◽  
Kinetics Model ◽  
Primary Radical ◽  
First Order ◽  
Uv Illumination ◽  
First Order Kinetics ◽  
Two Systems ◽  
Pseudo First Order ◽  
The Difference

Abstract In this study, the difference in oxidative capacity for removing antibiotics and the mechanism between the Cu(II)/peroxymonosulfate (PMS)/UV and Cu(II)/persulfate (PDS)/UV systems were compared under various conditions. The optimal Cu(II) concentration in the Cu(II)/PMS/UV system was 30 μM, and in the Cu(II)/PDS/UV system was 50 μM. With the PMS or PDS concentration increasing, higher tetracycline (TC) degradation in these two systems occurred. Investigation on the mechanism revealed that •OH was the primary radical in the Cu(II)/PMS/UV system, while SO4−• was the primary radical in the Cu(II)/PDS/UV system where •OH also played an important role. In these two systems, it was observed that Cu(I) was generated by PMS or PDS activated via UV illumination; however, oxygen alone could not promote TC removal. The degradation of TC was increased with the increasing pH level. In addition, TC degradation in the Cu(II)/PMS/UV system followed the pseudo-first-order kinetics model during the entire reaction period. It was found that the TC degradation kinetics in the Cu(II)/PDS/UV system can be divided into two parts (0 to 7 min and 10 to 50 min) and these two parts had good agreement with the pseudo-first-order kinetics model, respectively.

scholarly journals Photocatalytic removal of cefazolin from aqueous solution by AC prepared from mango seed+ZnO under UV irradiation

2018 ◽  
Vol 20 (2) ◽  
pp. 399-407 ◽  
Keyword(s):  
Activated Carbon ◽  
Kinetic Model ◽  
Uv Irradiation ◽  
Advanced Oxidation ◽  
Beam Radiation ◽  
Initial Concentration ◽  
First Order ◽  
First Order Kinetics ◽  
Pseudo First Order ◽  
Mango Seed

Presence of antibiotics in the environment specially in aqueous environments is considered a major warning about health and environment. Thus, this study aims the efficiency of coupled process of Activated Carbon (AC) prepared from mango seed+ZnO under UV irradiation as an advanced oxidation process in removing cefazolin antibiotic from aqueous solutions. This experimental study was carried out in a discontinuous reaction chamber with volume of one liter. In this process, the effect of initial pH parameters of the environment (3– 9), initial concentration of cefazolin (20 – 200 mg/L), concentration of modified, photocatalyzer (20 – 100 mg/L) and reaction time (10 – 60 min) were studied. The pilot used consisted of a low pressure mercury lamp with a 55-watt beam radiation power inside the steel chamber. The kinetic of the process was studied based on pseudo first order kinetics. Results showed that the highest removal efficiency of cefazolin antibiotics in the reaction of UV/AC + ZnO, at optimal conditions of pH= 3, contact time of 60 min, initial concentration of 100 mg/L and modified photocatalyzer of 0.1 g/L was equal to 96%. The kinetic model determined for the process followed kinetic model of pseudo- first order kinetics with high correlation of (R2 = 0.99). Results of present study revealed that photocatalyzer process of nanoparticles oxidation on synthetic activated carbon can be effectively used as an advanced oxidation reaction to remove cefazolin and similar pollutants.

scholarly journals Photodegradation of diclofenac in aqueous solution by simulated sunlight irradiation: kinetics, thermodynamics and pathways

2017 ◽  
Vol 75 (9) ◽  
pp. 2163-2170 ◽  
Author(s):  
N. Zhang ◽  
J. M. Li ◽  
G. G. Liu ◽  
X. L. Chen ◽  
K. Jiang
Keyword(s):  
High Performance ◽  
Degradation Products ◽  
Photobacterium Phosphoreum ◽  
Degradation Pathways ◽  
Simulated Sunlight ◽  
Liquid Chromatography Mass Spectrometry ◽  
Sunlight Irradiation ◽  
First Order ◽  
First Order Kinetics ◽  
Pseudo First Order

Diclofenac (DCF) is one of the most frequently detected pharmaceuticals in various water samples. This paper studied the effects of aquatic environmental factors (pH, temperature and dissolved organic matter) on photodegradation of DCF under simulated sunlight. The results demonstrate that degradation pathways proceed via pseudo first-order kinetics in all cases and the photodegradation of DCF by simulated sunlight. Thermodynamic study indicated that the photodegradation course is spontaneous, exothermic and irreversible. The rate constant gradually increased when the pH increased from 3 to 5, then decreased when the pH increased from 5 to 8, and finally increased when the pH further increased from 8 to 12. Humic acid inhibited the photodegradation of DCF. Three kinds of main degradation products were observed by high performance liquid chromatography/mass spectrometry and the degradation pathways were suggested. A toxicity test using Photobacterium phosphoreum T3 Sp indicated the generation of some more toxic products than DCF.

Electro-oxidative Decolouration and Degradation of Amaranth Dye Wastewater in Batch Setup using Novel Ti/TiO2-Ru2O-IrO2 Anode

2021 ◽  
Vol 18 (3) ◽  
pp. 69-77
Author(s):  
Prathamesh M. Khatu ◽  
Harshika Suman ◽  
Vikas Kumar Sangal ◽  
Manish Vashishtha ◽  
Tarun Chaturvedi
Keyword(s):  
Continuous Process ◽  
Research Work ◽  
Dye Wastewater ◽  
Optimum Conditions ◽  
First Order ◽  
First Order Kinetics ◽  
Stainless Steel Cathode ◽  
Electro Oxidation ◽  
Steel Cathode ◽  
Pseudo First Order

In this work, electro-oxidation of amaranth dye wastewater has been performed using dimensionally stable anode (DSA) and stainless-steel cathode. Ti/TiO2-Ru2O-IrO2 ternary electrode was used as the anode. Effect of various parameters such as current density, pH, voltage and time on the degradation and decolouration of dye was studied. Optimum conditions for the treatment of dye wastewater in batch setup were found. The complete decolouration was achieved in the first 5 min of the process. Decolouration and degradation of amaranth dye wastewater followed pseudo-first-order kinetics. The present research work unlocks the new horizon towards the degradation of dye wastewater employing the once through continuous process.

The photoconversion of gamma-hexachlorocyclohexane under UV irradiation in water, snow and ice

2013 ◽  
Vol 68 (11) ◽  
pp. 2479-2484 ◽  
Author(s):  
Honghai Xue ◽  
Xiaojian Tang ◽  
Chunli Kang ◽  
Jia Liu ◽  
Lei Shi ◽  
...  
Keyword(s):  
Chlorine Atom ◽  
Organic Pollutants ◽  
Uv Irradiation ◽  
Inorganic Ions ◽  
Kinetics Model ◽  
Inhibition Effect ◽  
First Order ◽  
First Order Kinetics ◽  
The Common ◽  
Snow And Ice

The photochemistry of organic pollutants has received increasing attention in ice and snow. In this work, the photoconversion of gamma-hexachlorocyclohexane (γ-HCH) under UV irradiation was investigated in water, snow and ice. The photoconversion rate, products and mechanisms were inspected, and the effect of inorganic ions (NO2−, NO3−, HCO3− and Fe2+) was discussed. The results showed that γ-HCH could be photoconverted in water, snow and ice, with the photoconversion rate being fastest in snow, and slowest in ice. All photoconversion could be described by the first-order kinetics model. In water, snow and ice, the common photoproducts of γ-HCH were alpha-hexachlorocyclohexane (α-HCH) and pentachlorocyclohexene. α-HCH was generated by a change in the bonding of a chlorine atom in γ-HCH; pentachlorocyclohexene was generated by the removal of a molecule of chlorine hydride from a molecule of γ-HCH. Different concentrations of NO2−, NO3− and HCO3− all inhibited the photoconversion of γ-HCH, and the inhibition effect decreased with increasing concentrations of NO2− and NO3−, but increased with the increasing concentrations of HCO3−. Different concentrations of Fe2+ promoted the photoconversion of γ-HCH in water and ice, but had little effect in snow.

The effect of photosensitizer on diclofenac photodegradation under simulated sunlight

2013 ◽  
Vol 67 (2) ◽  
pp. 418-423 ◽  
Author(s):  
N. Zhang ◽  
G. G. Liu ◽  
H. J. Liu ◽  
Y. L. Wang ◽  
T. Li
Keyword(s):  
High Performance ◽  
Degradation Products ◽  
Degradation Pathways ◽  
Simulated Sunlight ◽  
Liquid Chromatography Mass Spectrometry ◽  
First Order ◽  
Chemical Structures ◽  
First Order Kinetics ◽  
Photodegradation Rate ◽  
Pseudo First Order

This paper studies the effect of photosensitizer (acetone, H2O2, surfactant and pigment) on photodegradation of diclofenac (DCF) under simulated sunlight. The results demonstrate that degradation pathways proceed via pseudo first-order kinetics in all cases. The photodegradation rate was found to increase with increasing acetone and H2O2. Surfactant and pigment inhibited the photodegradation of DCF. Finally, four kinds of main degradation products were observed by high performance liquid chromatography/mass spectrometry and their chemical structures were suggested.

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