scholarly journals Efficient Degradation of Mordant Blue 9 Using the Fenton-Activated Persulfate System

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2532 ◽  
Author(s):  
Md. Nahid Pervez ◽  
Felix Y. Telegin ◽  
Yingjie Cai ◽  
Dongsheng Xia ◽  
Tiziano Zarra ◽  
...  
Keyword(s):  
Butyl Alcohol ◽  
Textile Dye ◽  
Oh Radicals ◽  
Operational Parameters ◽  
Reaction Conditions ◽  
Tert Butyl Alcohol ◽  
Initial Ph ◽  
Fe Complex ◽  
Optimal Reaction ◽  
Activated Persulfate

In this study, a Fenton-activated persulfate (Fe2+/PS) system was introduced for the efficient degradation of Mordant Blue 9 (MB 9) as a textile dye in an aqueous solution. Results showed that the degradation of MB 9 was markedly influenced by operational parameters, such as initial pH, PS concentration, Fe2+ concentration, and initial dye concentration. Optimal reaction conditions were then determined. Inorganic anions, such as Cl− and HCO3−, enhanced the degradation efficiency of MB 9 under optimal conditions. Addition of HCO3− reduced the degradation performance of MB 9, whereas the addition of Cl− increased the degradation percentage of MB 9. In addition, quenching experiments were conducted using methanol and tert-butyl alcohol as scavengers, and methanol was identified as an effective scavenger. Thus, the degradation of MB 9 was attributed to S O 4 • − and •OH radicals. The degradation and mineralization efficiency of MB 9 was significantly reduced using the conventional Fenton process i.e., Fe2+/ hydrogen peroxide (HP) because of the formation of a Fe complex during degradation. Meanwhile, the Fe2+/persulfate (PS) system improved the degradation and mineralization performance.

Radicals induced from peroxomonosulfate by nanoscale zero-valent copper in the acidic solution

2016 ◽  
Vol 74 (8) ◽  
pp. 1946-1952 ◽  
Author(s):  
Peng Zhou ◽  
Bei Liu ◽  
Jing Zhang ◽  
Yongli Zhang ◽  
Gucheng Zhang ◽  
...  
Keyword(s):  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Acidic Solution ◽  
Butyl Alcohol ◽  
First Order ◽  
First Order Kinetics ◽  
Tert Butyl Alcohol ◽  
Initial Ph ◽  
Reactive Radicals ◽  
Reactive Oxidant

A highly efficient advanced oxidation process for the degradation of benzoic acid (BA) during activation of peroxomonosulfate (PMS) by nanoscale zero-valent copper (nZVC) in acidic solution is reported. BA degradation was almost completely achieved after 10 min in the nZVC/PMS process at initial pH 3.0. PMS could accelerate the corrosion of nZVC in acidic to release Cu+ which can further activate PMS to produce reactive radicals. Both sulfate radical (SO4−•) and hydroxyl radical (•OH) were considered as the primary reactive oxidant in the nZVC/PMS process with the experiments of methyl (MA) and tert-butyl alcohol quenching. Acidic condition (initial pH ≤ 3.0) facilitated BA degradation and pH is a decisive factor to affect the oxidation capacity in the nZVC/PMS process. Moreover, BA degradation in the nZVC/PMS process followed the pseudo-first-order kinetics, and BA degradation efficiency increased with the increase of the nZVC dosage.

scholarly journals The removal efficiencies and mechanism of aniline degradation by peroxydisulfate activated with magnetic Fe-Mn oxides composite

2021 ◽  
Author(s):  
Lin Qiao ◽  
Yu Shi ◽  
Qingli Cheng ◽  
Bingtao Liu ◽  
Jing Liu
Keyword(s):  
High Performance ◽  
Butyl Alcohol ◽  
Reactive Species ◽  
Precipitation Method ◽  
Oh Radicals ◽  
Liquid Chromatography Mass Spectrometry ◽  
Singlet Molecular Oxygen ◽  
Tert Butyl Alcohol ◽  
Co Precipitation ◽  
Mn Oxides

Abstract The Fe-Mn oxides composite prepared by a chemical co-precipitation method was used as a heterogenous peroxydisulfate catalyst for the decomposition of aniline. This study investigated the mechanism of aniline degradation by PDS activated with catalyst. Reactive species resulting in the degradation of aniline was investigated via radical quenching experiments with different scavengers, including methanol, tert-butyl alcohol, EDTA and sodium azide. Based on the experiments made here, it is speculated that the predominant reactive species responsible for the degradation of aniline may be holes and singlet molecular oxygen rather than SO4·− and ·OH radicals. The degradation of compounds in catalyst/peroxydisulfate system was put forward. The three possible intermediates were speculated by high performance liquid chromatography-mass spectrometry, and two possible degradation pathways were proposed.

scholarly journals Fluorometric Detection of Thiamine Based on Hemoglobin–Cu3(PO4)2 Nanoflowers (NFs) with Peroxidase Mimetic Activity

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6359
Author(s):  
Hangjin Zou ◽  
Yang Zhang ◽  
Chuhan Zhang ◽  
Rongtian Sheng ◽  
Xinming Zhang ◽  
...  
Keyword(s):  
Food Production ◽  
Limit Of Detection ◽  
Vitamin B1 ◽  
Tween 80 ◽  
Fluorometric Detection ◽  
Oh Radicals ◽  
Fluorometric Method ◽  
Reaction Conditions ◽  
Optimal Reaction

Component analysis plays an important role in food production, pharmaceutics and agriculture. Nanozymes have attracted wide attention in analytical applications for their enzyme-like properties. In this work, a fluorometric method is described for the determination of thiamine (TH) (vitamin B1) based on hemoglobin–Cu3(PO4)2 nanoflowers (Hb–Cu3(PO4)2 NFs) with peroxidase-like properties. The Hb–Cu3(PO4)2 NFs catalyzed the decomposition of H2O2 into ·OH radicals in an alkaline solution that could efficiently react with nonfluorescent thiamine to fluoresce thiochrome. The fluorescence of thiochrome was further enhanced with a nonionic surfactant, Tween 80. Under optimal reaction conditions, the linear range for thiamine was from 5 × 10−8 to 5 × 10−5 mol/L. The correlation coefficient for the calibration curve and the limit of detection (LOD) were 0.9972 and 4.8 × 10−8 mol/L, respectively. The other vitamins did not bring about any obvious changes in fluorescence. The developed method based on hybrid nanoflowers is specific, pragmatically simple and sensitive, and has potential for application in thiamine detection.

scholarly journals Effects of operational parameters of process UV radiation/hydrogen peroxide on decolorization of anthraquinone textile dye

2012 ◽  
Vol 66 (4) ◽  
pp. 479-486
Author(s):  
Miljana Radovic ◽  
Jelena Mitrovic ◽  
Danijela Bojic ◽  
Milos Kostic ◽  
Radomir Ljupkovic ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Dye Decolorization ◽  
Maximum Energy ◽  
Energy Output ◽  
Textile Dye ◽  
Operational Parameters ◽  
Anthraquinone Dye ◽  
Scavenging Effect ◽  
Efficiency Increase ◽  
Initial Ph

The photodegradation of textile dye Reactive Blue 19, an anionic anthraquinone dye of reactive class, was investigated using UV radiation in the presence of H2O2 in UV reactor with low-pressure mercury lamps, with maximum energy output at the wavelength 254 nm. The effects of experimental variables, namely initial pH, initial dye concentration and concentration of peroxide were studied. The change of concentration of RB19 was followed by UV/vis spectrophotometric measurement of absorbance at 592 nm. The increase of the initial pH resulted in the efficiency increase of dye decolorization. The total decolorization was achieved in about 15 min. Results show that with the increase of dye concentration from 10 to 100 mg dm-3 the efficiency of process decreases. With the increase of the initial concentration of H2O2 from 10 to 30 mmol dm-3, the decolorization rate constant increased from 0.083 to 0.120 min1, with the decrease of process rate at the concentrations above. The highest decolorization rates were achieved at peroxide concentration of approx. 30 mmol dm-3, above which decolorization was inhibited by scavenging effect of peroxide. This study shows that UV/H2O2 process is promising treatment for dye RB 19 degradation in water and wastewater.

Electrochemical degradation of safranine T in aqueous solution by Ti/PbO2 electrodes

2020 ◽  
Vol 98 (1) ◽  
pp. 7-14 ◽  
Author(s):  
Baichen Liu ◽  
Bingli Ren ◽  
Yun Xia ◽  
Yang Yang ◽  
Yingwu Yao
Keyword(s):  
Aqueous Solution ◽  
Current Density ◽  
Intermediate Structure ◽  
Electrochemical Degradation ◽  
Reaction Conditions ◽  
First Order Kinetics ◽  
Safranine T ◽  
Initial Ph ◽  
Degradation Reaction ◽  
Optimal Reaction

The electrochemical degradation of safranine T (ST) in aqueous solution was studied. The effects of current density, initial concentration of ST, initial pH values, and Na2SO4 concentration on electrocatalytic degradation of ST in the aqueous solution by Ti/PbO2 electrode were analyzed. The experimental results showed that the electrochemical oxidization reaction of ST fitted a pseudo first order kinetics model. By using the Ti/ PbO2 electrode as the anode, 99.96% of ST can be eliminated at 120 min. It means that the electrochemical degradation of ST in aqueous solution by the Ti/PbO2 electrode was very effective. The optimal reaction conditions were as follows: current density, 40 mA cm−2; initial ST concentration, 100 mg L−1; Na2SO4 concentration, 0.20 mol L−1; initial pH, 6. It can be known from the test of UV–vis and HPLC in the reaction process that the intermediates will be generated, and the possible intermediate structure was studied by HPLC–MS test. However, with the progress of degradation reaction, the intermediates will eventually be oxidized into CO2 and H2O. Cyclic voltammetry and fluorescence experiments proved that ST was indirectly oxidized through the generation of hydroxyl radicals. Under the optimal reaction conditions, the energy required to completely remove ST was 17.92 kWh/m3.

Photocatalytic decolourization of the X3B textile dye in aqueous solutions using iron-rich montmorilloniteA paper submitted to the Journal of Environmental Engineering and Science.

2009 ◽  
Vol 36 (7) ◽  
pp. 1265-1271
Author(s):  
Zong-ping Wang ◽  
Li-zhi Huang ◽  
Lin Du ◽  
Hua Sheng ◽  
Bo Lv
Keyword(s):  
Aqueous Solutions ◽  
Butyl Alcohol ◽  
Low Ph ◽  
Textile Dye ◽  
Dye Wastewater ◽  
Ph Values ◽  
Tert Butyl Alcohol ◽  
Nano Clay ◽  
Uv Lamp ◽  
Structural Iron

Photocatalytic decolourization of textile dye X3B in aqueous solutions was investigated, using iron-rich montmorillonite (MMt, 2.24%Fe2O3) under a 15 W low-pressure UV lamp (λ = 254 nm, I = 48.4 μW/cm2). Hydroxyl radicals (•OH) were detected by tert-butyl alcohol (TBA) in aqueous MMt suspensions under UV irradiation and were found to be responsible for the degradation of X3B. Free iron ions dissolved in MMt suspensions, structural iron in the MMt solid, and the charged surface of nano clay are responsible for hydroxyl radical (•OH) production. Low pH values are favorable for the decolourization of X3B. The •OH concentration increased with increasing aqueous MMt concentrations in the range of 0 – 2.0 g/L; higher concentrations, for example, 5.0 g/L MMt, inhibited the •OH production. The addition of oxalate was favorable for X3B photodegradation in acid-washed MMt suspensions. This study shows that iron-rich MMt is a potential photocatalyst for the treatment of dye wastewater.

scholarly journals Thermally activated persulfate treatment and mineralization of a recalcitrant high TDS petrochemical wastewater

2017 ◽  
Vol 19 (2) ◽  
pp. 72-77 ◽  
Author(s):  
Sahand Jorfi ◽  
Sudabeh Pourfadakari ◽  
Mehdi Ahmadi ◽  
Hamideh Akbari
Keyword(s):  
Ph Value ◽  
Cod Removal ◽  
Order Kinetic ◽  
Operational Parameters ◽  
Batch Mode ◽  
Thermally Activated ◽  
Toc Removal ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Activated Persulfate

Abstract Thermally activated persulfate efficiency for the treatment of a recalcitrant high TDS wastewater was investigated. The specific character of studied wastewater was high TDS content of around 23820 mg/L and BOD5/COD ratio of 0.07. Effective operational parameters including initial pH values of 3–9, reaction temperature of 40–80°C and persulfate concentrations of 0.5–5 g/L for COD removal were investigated in batch mode experiments. Removal efficiency was pH and temperature dependent. The COD and TOC removal of 94.3% and 82.8% were obtained at persulfate concentration of 4 g/L, initial pH value of 5 and temperature of 70°C after 180 min for initial COD concentration of 1410 mg/L. The pseudo first-order kinetic model was best fitted with COD removal (R2 = 0.94).

scholarly journals Mechanism of protection of adenosine from tert-butoxyl radicals and repair of adenosine radicals by α-tocopherol in aqueous solution

2014 ◽  
Vol 7 (1) ◽  
Author(s):  
G. Vijayalakshmmi ◽  
M. Adinarayanna ◽  
P. Jayaprrakash Rao
Keyword(s):  
Aqueous Solution ◽  
Rate Constant ◽  
Butyl Alcohol ◽  
Quantum Yields ◽  
Oh Radicals ◽  
Butyl Hydroperoxide ◽  
Tert Butyl ◽  
Tert Butyl Hydroperoxide ◽  
Tert Butyl Alcohol

The rates of oxidation of adenosine and α-tocopherol by tert-butoxyl radicals (t-BuO•) were studied spectrophotometrically. Radicals (t-BuO•) were generated by the photolysis of tert-butyl hydroperoxide (t-BuOOH) in presence of tert-butyl alcohol to scavenge •OH radicals. The rates and the quantum yields () of oxidation of α-tocopherol by t-BuO• radicals were determined in the absence and presence of varying concentrations of adenosine. An increase in the concentration of adenosine was found to decrease the rate of oxidation of α-tocopherol, suggesting that adenosine and α-tocopherol competed for t-BuO• radicals. From competition kinetics, the rate constant of α-tocopherol reaction with t-BuO• was calculated to be 7.29 x 108 dm3 mol-1 s-1. The quantum yields expt and cal values suggested that α-tocopherol not only protected adenosine from t-BuO• radicals, but also repaired adenosine radicals, formed by the reaction of adenosine with t-BuO• radicals.

Research on Oxidation of Phenanthrene to Phenanthrenequinone with TBHP

2013 ◽  
Vol 690-693 ◽  
pp. 1256-1260
Author(s):  
Ying Ji Luo ◽  
Zu Yu Liu
Keyword(s):  
Reaction Time ◽  
Butyl Alcohol ◽  
Orthogonal Test ◽  
Molar Ratio ◽  
Optimum Conditions ◽  
Reaction Conditions ◽  
Technical Parameters ◽  
Tert Butyl ◽  
Preparation Conditions ◽  
Tert Butyl Alcohol

The oxidation of phenanthrene with TBHP into phenanthrenequinone has been studied. Reaction conditions were investigated by orthogonal test, and main technical parameters optimized. The optimum preparation conditions of TBHP were as follows: molar ratio of H2O2 to tert-butyl alcohol: 2:1; molar ratio of H2SO4 to tert-butyl alcohol: 0.4:1; reaction temperature: 60°C; reaction time: 4 h. And for the preparation of phenanthrenequinone the optimum conditions: molar ratio of TBHP to phenanthrene: 5:1; MoO2(acac)2 (catalyster) content: 0.05g(per 5g phenanthrene); reaction time: 4h.

scholarly journals Treatment of Color Filter Wastewater by Fresnel Lens Enhanced Solar Photo-Fenton Process

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Wen-shiuh Kuo ◽  
Chia-ling Wu
Keyword(s):  
Solar Energy ◽  
Fenton Reaction ◽  
Fresnel Lens ◽  
Treated Wastewater ◽  
Color Filter ◽  
Fenton Process ◽  
Promoting Effect ◽  
Reaction Conditions ◽  
Initial Ph ◽  
Optimal Reaction

Treatment of color filter wastewater using solar photo-Fenton process enhanced by high-concentrating Fresnel lens was investigated in this paper. Optimal reaction conditions based on response surface methodology (RSM) were established as under an initial pH of 5, a [H2O2]0/COD0ratio of 1~1.35 and a [H2O2]0/[Fe2+]0ratio of 15 for a reaction time of 60 min, which could reach a readily biodegradable level, that is, the biodegradability (BOD5/COD) of wastewater was more than 0.3. With the assistance of Fresnel lens, the solar photo-Fenton process increased the COD degradation rate and mineralization rate by a factor of 4.5 and 6.5, respectively. In addition, the microtoxicity (TU50) of wastewater was almost diminished after a 60 min of treatment, whereas the microtoxicity of treated wastewater without the assistance of Fresnel lens remained a TU50value of 1.166. This could be mainly due to the concentrating effect of Fresnel lens for solar energy, resulting in an increase of 2~3 times of solar light intensity and a raising heat irradiation in terms of 15~30 °C of wastewater temperature. These results revealed that solar energy could be concentrated effectively by using Fresnel lens and showed a significant promoting effect on the photo-Fenton reaction for treating color filter wastewater.

Sign in / Sign up

Export Citation Format

Share Document