scholarly journals Assessment of Degradation Behavior for Acetylsalicylic Acid Using a Plasma in Liquid Process

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 965 ◽  
Author(s):  
Hye-Jin Bang ◽  
Heon Lee ◽  
Young-Kwon Park ◽  
Hyung-Ho Ha ◽  
Young Hyun Yu ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Acetylsalicylic Acid ◽  
Degradation Rate ◽  
Electrical Power ◽  
Initial Increase ◽  
Tio2 Powder ◽  
Plasma Generation ◽  
Pharmacologically Active ◽  
Decomposition Efficiency ◽  
Plasma In Liquid

Acetylsalicylic acid (ASA) is a pharmacologically active compound. In this study, ASA was decomposed effectively using a plasma in liquid phase process with hydrogen peroxide and TiO2 photocatalyst. Increasing the electrical power conditions (frequency, applied voltage, and pulse width) promoted plasma generation, which increased the rate of ASA decomposition. The added hydrogen peroxide increased the rate of ASA degradation, but injecting an excess decreased the degradation rate due to a scavenger effect. Although there was an initial increase in the decomposition efficiency by the addition of TiO2 powder, the addition of an excessive amount inhibited the generation of plasma and decreased the degradation rate. The simultaneous addition of H2O2 and TiO2 powder resulted in the highest degradation efficiency. We suggest that ASA is converted to salicylic acid through demethylation by hydroxyl radicals and is finally mineralized to carbon dioxide and water via 2,4-dihydroxy benzoic acid and low molecular acids.

scholarly journals Degradation of Remazol Black dye from Aqueous Solution by Heterogeneous NH3(MoO3)3/H2O2 System

2021 ◽  
pp. 67-78
Author(s):  
Kouakou Yao Urbain ◽  
Kambiré Ollo ◽  
Gnonsoro Urbain Paul ◽  
Eroi N’goran Sévérin ◽  
Trokourey Albert
Keyword(s):  
Hydrogen Peroxide ◽  
Molybdenum Oxide ◽  
Degradation Rate ◽  
Dye Degradation ◽  
Degradation Kinetics ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Molybdenum Nanoparticles ◽  
Remazol Black

Aims: The pollution of the environment by organic dyes in water is a matter of great concern. Wastewater containing dyes is difficult to treat by conventional wastewater treatment methods such as coagulation, ozonation, biological treatment, etc. This is why the implementation of an effective method by not generating pollutants secondary is necessary. The objective of this work is to study the degradation of remazol black, an azo dye, by the coupling of hydrogen peroxide - molybdenum oxide nanoparticle. The nanoparticles were synthesized by the aqueous sol-gel method using a reflux assembly. Study Design: Random design. Methodology: The nanoparticles were synthesized by the aqueous sol-gel method using a reflux assembly and then characterized by X-ray diffraction and using software origin to determine the particles size by Scherrer's formula. The influence of hydrogen peroxide, molybdenum oxide and hydrogen peroxide / molybdenum oxide coupling, and the degradation kinetics of remazol black were studied. We also studied the influence of the pH of the solution, the mass of molybdenum nanoparticles and the concentration of remazol black on the dye degradation process. Results: The results showed that the synthesized oxide is ammonium molybdenum trioxide NH3(MoO3)3) with a hexagonal structure and size 22.79 nm. The study of the catalytic effect revealed a degradation rate of 17%, 0.83% and 42% respectively for H2O2, NH3(MoO3)3 and the coupling NH3(MoO3)3/H2O2. The study also showed that the degradation of remazol black by the couple NH3(MoO3)3 /H2O2 is better at pH = 4 and for a mass of nanoparticles of 400 mg. This degradation kinetics are pseudo 1st order. In addition, the degradation rate decreases when the concentration of remazol black increases. The efficiency of the coupling (NH3(MoO3)3 / H2O2 showed at ambient temperature, that it was possible to remove about 60% of the initial color of remazol black from the water in a batch reaction. Conclusion: The reflux method makes it possible to synthesize molybdenum nanoparticles. The molybdenum oxide hetero-Fenton process is effective in removing remazol black dye from water.

scholarly journals Evaluation of Antioxidant and Antibacterial Properties of Magnolia champaca L (Magnoliaceae) Stem Bark Extract

2020 ◽  
Vol 23 (2) ◽  
pp. 96-102
Author(s):  
Md Mahadi Hasan ◽  
Masuma Akter ◽  
Md Ekramul Islam ◽  
Md Aziz Abdur Rahman ◽  
Mst Shahnaj Parvin
Keyword(s):  
Hydrogen Peroxide ◽  
Antioxidant Activity ◽  
Antibacterial Activity ◽  
Antioxidant Capacity ◽  
Total Antioxidant Capacity ◽  
Antibacterial Properties ◽  
Reducing Power ◽  
Stem Bark ◽  
Total Antioxidant ◽  
Pharmacologically Active

The current study was designated to explore the antioxidant and antibacterial properties of the methanolic extract of Magnolia champaca stem bark and its different fractions. Antioxidant activity was assessed using total antioxidant capacity, ferric reducing power, DPPH, hydroxyl and hydrogen peroxide scavenging assay. Antibacterial activity was evaluated against five gram positive and five gram negative bacteria using disc diffusion assay method. Among the different fractions, chloroform fraction (CHF) and ethyl acetate fraction (EAF) showed the highest antioxidant activity whereas aqueous fraction (AQF) showed lowest activity in DPPH radical scavenging assay with IC50 of 12.12, 22.41 and 55.16 μg/ml, respectively. Both of the extracts CHF and EAF also exhibited highest total antioxidant capacity, ferric reducing power and hydrogen peroxide scavenging activity with concentration dependent manner when compared to standard BHT. Moderate to potent antibacterial activity was observed against all tested organisms compared to standard azithromycin. The results from the present study revealed that the different fractions of stem bark of M. champaca specially CHF and EAF possess antioxidant and antibacterial property which support its use in traditional medicine and suggesting that the plant may be further investigated to discover its pharmacologically active natural products. Bangladesh Pharmaceutical Journal 23(2): 96-102, 2020

Treatment of nano-sized rutile TiO2 powder in hydrogen peroxide under microwave irradiation and investigation on its sonocatalytic activity

2009 ◽  
Vol 45 (6) ◽  
pp. 651-658 ◽  
Author(s):  
Jun Wang ◽  
Zhao Hong Zhang ◽  
Jia Li ◽  
Ying Peng Xie ◽  
Zhe Jiang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Microwave Irradiation ◽  
Tio2 Powder ◽  
Rutile Tio2

Dairy Farming Simulated Organic Wastewater of Degradation Experiment by Hydrogen Peroxide

2014 ◽  
Vol 1015 ◽  
pp. 729-732
Author(s):  
Yong Guang Bi ◽  
Kuan Xin Zhang
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Pollutants ◽  
Degradation Rate ◽  
Treatment Method ◽  
Dairy Farming ◽  
Initial Concentration ◽  
Hydrogen Peroxide Treatment ◽  
Simulated Wastewater ◽  
Organic Wastewater

In dairy farming simulated wastewater resorcinol as the research object, using hydrogen peroxide treatment method to study the effect of resorcinol, the results showed that: when the initial concentration of hydroquinone 1.0g / L, 1.5g / L, 2.0g / L, 2.5g / L, 3.0g / L, the degradation rate was: 45.95%, 44.72%, 40.86%, 35.37%, 31.23%. Resorcinol degradation rate increases with the decrease of the initial concentration, that is beneficial to the low initial concentration of degradation, but the higher the initial concentration of the degradation rate. When the amount of hydrogen peroxide is 1mL, 1.5mL, 2mL, 2.5mL, when 3mL, the degradation rate was: 60.40%, 63.54%, 68.13%, 75.87%, 80.94%. Studies have shown that ultrasound combined with hydrogen peroxide is a good resorcinol degradation of organic pollutants in new ways.

scholarly journals Highly efficient UV/H2O2 technology for the removal of nifedipine antibiotics: Kinetics, co-existing anions and degradation pathways

PLoS ONE ◽  
2021 ◽  
Vol 16 (10) ◽  
pp. e0258483
Author(s):  
Wenping Dong ◽  
Chuanxi Yang ◽  
Lingli Zhang ◽  
Qiang Su ◽  
Xiaofeng Zou ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Hydrogen Peroxide ◽  
Degradation Rate ◽  
Degradation Kinetics ◽  
Degradation Pathways ◽  
Oxygen Species ◽  
Highly Efficient ◽  
Initial Ph ◽  
Primary Key ◽  
Kinetics Of

This study investigates the degradation of nifedipine (NIF) by using a novel and highly efficient ultraviolet light combined with hydrogen peroxide (UV/H2O2). The degradation rate and degradation kinetics of NIF first increased and then remained constant as the H2O2 dose increased, and the quasi-percolation threshold was an H2O2 dose of 0.378 mmol/L. An increase in the initial pH and divalent anions (SO42- and CO32-) resulted in a linear decrease of NIF (the R2 of the initial pH, SO42- and CO32- was 0.6884, 0.9939 and 0.8589, respectively). The effect of monovalent anions was complex; Cl- and NO3- had opposite effects: low Cl- or high NO3- promoted degradation, and high Cl- or low NO3- inhibited the degradation of NIF. The degradation rate and kinetics constant of NIF via UV/H2O2 were 99.94% and 1.45569 min-1, respectively, and the NIF concentration = 5 mg/L, pH = 7, the H2O2 dose = 0.52 mmol/L, T = 20 ℃ and the reaction time = 5 min. The ·OH was the primary key reactive oxygen species (ROS) and ·O2- was the secondary key ROS. There were 11 intermediate products (P345, P329, P329-2, P315, P301, P274, P271, P241, P200, P181 and P158) and 2 degradation pathways (dehydrogenation of NIF → P345 → P274 and dehydration of NIF → P329 → P315).

The Effects of Using Various Types of Pulsed Discharge Reactors for Phenol Removal in Waste Water

2003 ◽  
Vol 6 (1) ◽  
Author(s):  
Shinta Kunitomo ◽  
Tadashi Ohbo ◽  
Bing Sun
Keyword(s):  
Hydrogen Peroxide ◽  
Removal Efficiency ◽  
Degradation Rate ◽  
Phenol Degradation ◽  
Phenol Removal ◽  
Pulsed Discharge ◽  
Discharge Characteristics ◽  
Reactor Configuration ◽  
Different Types ◽  
Degradation Properties

AbstractIn this investigation, the pulsed discharge characteristics in water and the phenol-degradation properties of three different types of reactors, which had rod-rod, rod-plate and wire-cylinder format, were studied. Among the three types of reactors, it was found that the phenol removal efficiency was highest for the wirecylinder reactor configuration. In addition, the influence of pulse energy for removal efficiency was investigated. The removal efficiency at 180 kV-72 J discharged is higher than at 180 kV-960 J discharged. Furthermore, the effect of hydrogen peroxide on phenol removal efficiency was also studied under conditions of 120 kV-72 J, and it was found that the phenol degradation rate was higher when hydrogen peroxide was used.

scholarly journals Penetration of Hydrogen Peroxide and Degradation Rate of Different Bleaching Products

2015 ◽  
Vol 40 (1) ◽  
pp. 72-79 ◽  
Author(s):  
FC Marson ◽  
RS Gonçalves ◽  
CO Silva ◽  
LTÂ Cintra ◽  
RC Pascotto ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Residence Time ◽  
Degradation Rate ◽  
Dental Enamel ◽  
Spectrophotometric Analysis ◽  
Acetate Buffer Solution ◽  
Tooth Surface ◽  
Buffer Solution ◽  
Tooth Structure ◽  
Bleaching Gels

SUMMARY This study's aim was to evaluate the degradation rate of hydrogen peroxide (H2O2) and to quantify its penetration in tooth structure, considering the residence time of bleaching products on the dental enamel. For this study, bovine teeth were randomly divided according to the bleaching product received: Opalescence Xtra Boost 38%, White Gold Office 35%, Whiteness HP Blue 35%, Whiteness HP Maxx 35%, and Lase Peroxide Sensy 35%. To analyze the degradation of H2O2, the titration of bleaching agents with potassium permanganate was used, while the penetration of H2O2 was measured via spectrophotometric analysis of the acetate buffer solution, collected from the artificial pulp chamber. The analyses were performed immediately as well as 15 minutes, 30 minutes, and 45 minutes after product application. The data of degradation rate of H2O2 were submitted to analysis of variance (ANOVA) and Tukey tests, while ANOVA and Fisher tests were used for the quantification of H2O2, at the 5% level. The results showed that all products significantly reduced the concentration of H2O2 activates at the end of 45 minutes. It was also verified that the penetration of H2O2 was enhanced by increasing the residence time of the product on the tooth surface. It was concluded that the bleaching gels retained substantial concentrations of H2O2 after 45 minutes of application, and penetration of H2O2 in the dental structure is time-dependent.

Azo Dye-Yellow 17 Wastewater Photocatalytic Degradation of by UV/TiO2 Combined with Ultrasonic Procedure

2010 ◽  
Vol 123-125 ◽  
pp. 11-14 ◽  
Author(s):  
Chen Yu Chang ◽  
Yu Jie Chang ◽  
Yung Hsu Hsieh ◽  
Ching Hsing Lin ◽  
Shih Hung Yen
Keyword(s):  
Hydrogen Peroxide ◽  
Azo Dye ◽  
Degradation Rate ◽  
Ph Value ◽  
Dye Wastewater ◽  
Treatment Efficiency ◽  
Initial Concentration ◽  
Initial Adsorption ◽  
Significant Additive Effect ◽  
Fe Ions

. The study combined UV/TiO2 with ultrasonic procedure to degrade azo dye wastewater of Acid Yellow 17. The effects of factors including pH value, initial concentration of dye, and quantities of TiO2, Fe (II), and Fe (III) added on the removal efficiency of azo dye Acid Yellow 17 were investigated. Experimental results revealed significant additive effect attributed to the combination of two procedures under 13-watt UV irradiation and 10-watt ultrasound. Analysis of the catalyst properties indicated no evident changes in the appearance of crystal and TiO2 catalyst by UV/TiO2 combined with ultrasonic procedure. However, the specific surface area was increased by approximately 53%. No effective formation of hydrogen peroxide (ND  1 mg/L) proved that the addition of Fe (II) and Fe (III) failed to induce the Fenton-like reaction effectively. Nevertheless, the addition of Fe ions affected significantly the initial adsorption and the degradation rate of the dye. Moreover, the treatment efficiency of Fe (III) was found to be superior to that of Fe (II) under the same concentration.

Degradation of trypan blue dye using neutralized red mud in circulating fluidized bed reactor and its kinetics study

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sakshi Manekar ◽  
Titikshya Mohapatra ◽  
Chandrakant Thakur ◽  
Prabir Ghosh
Keyword(s):  
Hydrogen Peroxide ◽  
Fluidized Bed ◽  
Red Mud ◽  
Trypan Blue ◽  
Degradation Rate ◽  
Circulating Fluidized Bed ◽  
Dye Degradation ◽  
Fluidized Bed Reactor ◽  
Blue Dye ◽  
Catalyst Dosage

Abstract Dye is a common pollutant present in many chemical industrial waste water. Advanced oxidation processes are widely used for dye degradation. In this study, the degradation of trypan blue dye was examined by Fenton process. Neutralized red mud catalyst was used as a source of ferrous ion for Fenton’s process. The dye degradation performance has been analyzed by using circulating fluidized-bed reactor. The influence of some key parameters such as pH, initial dye concentration, catalyst dosage and hydrogen peroxide concentration on the degradation of dye has been investigated. All the experiments were performed for 90 min. The initial dye concentration was taken as 1.56 × 10−5 and 2.60 × 10−5 mol L−1 and the amount of catalyst was varied from 0.5 to 0.7 gm/L. The hydrogen peroxide was taken in the ratio of 1:20 with the catalyst. The effect of pH was studied in the varying range from 3–5. It was found that the more the acidic pH, more will be the rate of degradation. The increase in pH results in the lower degradation rate. As the amount of catalyst was increased, the degradation rate got increased. The optimized results were obtained at pH 3, catalyst dosage of 0.7 gm/L and dye concentration of 1.56 × 10−5 mol L−1. Subsequently, the reaction kinetics of Fluidized-bed reactor was also studied.

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