scholarly journals Ultraviolet Radiation/persulphate/hydrogen Peroxide Treatment System for Acid Blue 80 Dye Degradation of Batch Flow Chemical Reactor: Effects of Operational Parameters, Mineralisation, Energy Consumption, and Kinetic Studies

2021 ◽  
Author(s):  
Tariq Al–Musawi ◽  
Murat Yilmaz ◽  
Amir Mahvi ◽  
Samaneh Mohebi ◽  
davoud balarak
Keyword(s):  
Hydrogen Peroxide ◽  
Energy Consumption ◽  
Dye Degradation ◽  
Kinetic Studies ◽  
Chemical Reactor ◽  
Degradation Process ◽  
Reaction Rate Constant ◽  
The Other ◽  
Operational Parameters ◽  
Acid Blue

Abstract This study offers a comprehensive investigation into the efficiency of degradation of acid blue 80 (AB80) dye using a system using ultraviolet (UV) radiation combined with hydrogen peroxide (H2O2) and persulphate (PS) oxidants (UV/PS/H2O2). The degradation reactions were performed under different values of PS and H2O2 concentrations, initial AB80 dye concentration, pH, UV intensity, and contact time. The results revealed that the UV/H2O2 provided the best performance at pH of 5, while the best performance for the UV/PS and UV/PS/H2O2 systems was obtained at pH of 7. Besides, 15 mmol was found to be the optimum concentration for both oxidants. The efficiency of the combined process of the UV/PS/H2O2 was higher than that of the other two processes i.e., UV/PS and UV/H2O2, which was 98.2% for a dye concentration of 25 mg/L. Further, the BOD5/COD ratios at the beginning and end of the UV/PS/H2O2 process were 0.19 and 0.52, respectively, indicative of the conversion of the non-biodegradable dye molecules to biodegradable compounds. The toxicity test was performed using the bioassay method with Daphnia magna, and 90% reduction in toxicity was observed in the effluent. The lethal concentration 50 (LC50) indicator was found to be 4.7 mg/L for the dye solution. The results also revealed that the degradation data followed the pseudo-first-order kinetics, and the reaction rate constant was higher for the UV/PS/H2O2 system than for the other systems. The rate of mineralisation by this process was 0.92. Scavenging studies also showed that both the sulphate (SO°-4) and hydroxyl (OH°) radicals play an important role in the degradation process. Energy consumption in the UV/H2O2, UV/PS, and UV/PS/H2O2 processes was 61, 47.8, and 20.8 kWh/m3, respectively. On conclusion, the UV/PS/H2O2 is an effective and applicable process for the treatment of dye in wastewater, particularly when the medium is neutral.

Photodegradation Studies on Orange G and Acid Blue 113: New Doped Rare Earth Nanometal Oxides as Visible Light Active Photo Catalyst

2014 ◽  
Vol 938 ◽  
pp. 257-262
Author(s):  
G.A. Suganya Josephine ◽  
Arumugam Sivasamy
Keyword(s):  
Rare Earth ◽  
Visible Light ◽  
Kinetic Studies ◽  
Degradation Process ◽  
Oh Radicals ◽  
Time Duration ◽  
Ph Variation ◽  
Orange G ◽  
Acid Blue 113 ◽  
Acid Blue

Dyes are a source of serious pollutants from different industrial outlets and show a major contribution in polluting the environment. In the present study two dyes namely Orange G and Acid Blue 113 were compared for their photodegradation efficiency employing rare earth nanometal oxide as a visible active photocatalyst. The prepared catalyst was nanocrystalline form with particle size 70 nm and the surface of the catalyst was highly porous and rough which facilitates the absorption of the dye further enhance the photo degradation which were confirmed by various characterization techniques. Effect of pH, variation of catalyst dosage, variation of initial dye concentration and kinetic studies were conducted for both the dyes. The reaction followed a pseudo first order kinetics. The activity of the prepared catalyst was higher when compared to a commercially used metal oxide. Reusability studies proved that the catalyst prepared was very active even upto the third cycle. The degradation process was initiated by the attack of the OH radical generated in the in-situ process via visible light irradiation. EPR spin trapping technique was employed to confirm the presence of OH radicals. The prepared catalyst degraded the dye molecules of interest in lesser time duration by absorption of visible light, thereby reducing the cost of photodegradation.

Degradation of Bisphenol-A by Ozonation

2009 ◽  
Vol 12 (2) ◽  
Author(s):  
Isil Gultekin ◽  
Valko Mavrov ◽  
Nilsun H. Ince
Keyword(s):  
Bisphenol A ◽  
Mass Transfer Rate ◽  
Degradation Process ◽  
Bimolecular Reaction ◽  
Reaction Rate Constant ◽  
Operational Parameters ◽  
Endocrine Disrupting Compound ◽  
Ozone Addition ◽  
Endocrine Disrupting ◽  
Addition Rate

AbstractThe study reports the degradation of an endocrine disrupting compound- bisphenol A (BPA) by ozonation at slightly acidic pH with emphasis on the operational parameters (e.g. BPA concentration, ozone addition and mass transfer rate, contact time), reaction kinetics, rate constants and oxidation byproducts. It was found that the rate of BPA decay (pseudo-first order with respect to concentration) was accelerated with increased ozone addition rate and decreased BPA initial concentration. The profile of aqueous ozone concentration was such that it remained constant during 1-3 min of contact and increased thereafter. The bimolecular reaction rate constant was estimated using the steady state concentration of ozone and the value found was in good agreement with those reported in the literature for similar pH. Total mineralization was most rapid before complete conversion of BPA and much slower thereafter, implying low reactivity of the intermediate products with ozone. Mineralization was enhanced by alkalinization to pH 10.8, which facilitated the overall degradation process via the formation of radical species that were less selective than ozone. Byproducts of oxidation in successive order of formation were p-tert-butylphenol, hydroquinone, methyl-dihydrobenzofuran and n-butyl acetate, none of which are classified as endocrine disruptors.

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 Degradation Efficiency and Kinetics Analysis of an Advanced Oxidation Process Utilizing Ozone, Hydrogen Peroxide and Persulfate to Degrade the Dye Rhodamine B

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 974
Author(s):  
Piotr Zawadzki ◽  
Małgorzata Deska
Keyword(s):  
Hydrogen Peroxide ◽  
Rhodamine B ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation Process ◽  
Dye Degradation ◽  
Advanced Oxidation ◽  
Degradation Process ◽  
Oxidation Processes ◽  
First Order Kinetics ◽  
Ozonation Process

In this study, the effectiveness of a rhodamine B (RhB) dye degradation process at a concentration of 20 mg/L in different advanced oxidation processes—H2O2/UV, O3/UV and PDS/UV—has been studied. The use of UV in a photo-assisted ozonation process (O3/UV) proved to be the most effective method of RhB decolorization (90% after 30 min at dye concentration of 100 mg/L). The addition of sulfate radical precursors (sodium persulfate, PDS) to the reaction environment did not give satisfactory effects (17% after 30 min), compared to the PDS/UV system (70% after 30 min). No rhodamine B decolorization was observed using hydrogen peroxide as a sole reagent, whereas an effect on the degree of RhB degradation was observed when UV rays strike the sample with H2O2 (33% after 30 min). The rhodamine B degradation process followed the pseudo-first-order kinetics model. The combined PDS/O3/UV process has shown 60% color removal after 30 min of reaction time at an initial dye concentration of 100 mg/L. A similar effectiveness was obtained by only applying ozone or UV-activated persulfate, but at a concentration 2–5 times lower (20 mg/L). The results indicated that the combined PDS/O3/UV process is a promising method for high RhB concentrations (50–100 mg/L) comparing to other alternative advanced oxidation processes.

scholarly journals High Photocatalytic Performance of Modified Bismuth Oxychloride Semiconductor under Sunlight

2021 ◽  
Vol 37 (4) ◽  
pp. 770-778
Author(s):  
Preeja. P. Thattil ◽  
A. Leema Rose
Keyword(s):  
Dye Degradation ◽  
Diffuse Reflectance Spectrum ◽  
Ultra Violet ◽  
Analytical Techniques ◽  
Kinetic Studies ◽  
Degradation Process ◽  
Bet Surface Area ◽  
X Ray ◽  
Bismuth Oxychloride ◽  
Potential Applications

In recent years, the bismuth compounds have gained much interest due to their potential applications in the field of Photocatalysis. In our present work, Bismuth oxychloride Photocatalyst and Aluminium fluoride doped Bismuth oxychloride photocatalyst were synthesized by simple chemical methods using Bismuth nitrate pentahydrate as the precursor. The synthesized photocatalysts were characterized by different analytical techniques such as X-ray diffraction analyses, Ultra Violet –Diffuse reflectance spectrum, Field Emission – Scanning Electron Microscopy, Energy dispersive X-ray analyses,Fourier transform infrared spectroscopy studies and BET surface area analysis. The photocatalytic performances of the as-synthesized doped and undoped Bismuth oxychloride photocatalyst were tested towards the degradation of Acid green 1 dye. The parameters such as the effect of pH, catalyst concentration and initial dye concentration are optimized, and the kinetic studies are carried out for the photocatalytic dye degradation process. The experimental results showed that about 80% of the Acid green 1 dye got decolourized within 90 minutes by effective air purging under natural sunlight radiation in the presence of the AlF-BiOCl photocatalyst under optimized conditions.

scholarly journals Degradation of paraquat herbicide using hybrid AOP process: statistical optimization, kinetic study, and estimation of electrical energy consumption

2021 ◽  
Vol 33 (1) ◽  
Author(s):  
Azam Ghavi ◽  
Ghadamali Bagherian ◽  
Hadi Rezaei-Vahidian
Keyword(s):  
Energy Consumption ◽  
Kinetic Studies ◽  
Electrical Energy ◽  
Degradation Process ◽  
Degradation Efficiency ◽  
Order Kinetic ◽  
Electrical Energy Consumption ◽  
Optimum Conditions ◽  
Oxidant Concentration ◽  
Order Kinetic Model

Abstract Background This work studied the performance of UV/PS/TiO2NPs and UV/PI/TiO2NPs as hybrid advanced oxidation processes for degradation of paraquat in aqueous solution, because this very toxic herbicide is used third most widely. Results The effects of several factors such as UV irradiation, initial oxidant concentration, TiO2 nanoparticles dosage, and pH on the degradation efficiency were investigated. The process optimization was performed by the central composite design as a tool of response surface methodology for 30 mgL−1 of the herbicide initial concentration at 25 ℃ and 40 min of degradation process. Based on the results, a degradation efficiency of 77% and 90% were obtained for the UV/PS/TiO2NPs and UV/PI/TiO2NPs processes, respectively, in the optimum conditions. The mineralization efficiency of the paraquat solution using UV/PS/TiO2NPs and UV/PI/TiO2NPs processes are about 32% and 55%, respectively, after 40 min. The kinetic studies show that both processes follow a pseudo-first-order kinetic model, and the kinetic constants are 0.0299 min−1 for the PS process and 0.0604 min−1 for the PI process. The electrical energy consumption was estimated to be about 481.60 kWhm−3 for the PS process and 238.41 kWhm−3 for the PI process. Conclusions The degradation and mineralization efficiency of the paraquat solution using the UV/PI/TiO2NPs process was more than that of the UV/PS/TiO2NPs process at the optimum conditions after 40 min.

Phenol Degradation by Catalytic Wet Hydrogen Peroxide Oxidation on Fe/Active Carbon Catalyst

2012 ◽  
Vol 433-440 ◽  
pp. 147-152
Author(s):  
Ying Chun Yang ◽  
Yuan Gang Lu ◽  
Zhi Xiang Ye ◽  
Li Ping He ◽  
Jing Yu
Keyword(s):  
Hydrogen Peroxide ◽  
Active Carbon ◽  
Degradation Rate ◽  
Ph Value ◽  
Phenol Degradation ◽  
Kinetic Studies ◽  
Reaction Rate Constant ◽  
Peroxide Oxidation ◽  
Hydrogen Peroxide Oxidation ◽  
Degradation Reaction

A catalyst based on Fe/active carbon (Fe/AC) and H2O2 as oxidant for the catalytic wet hydrogen peroxide oxidation of phenol in aqueous solution was investigated. The results indicate that the degradation rate of phenol(20mg/L) reach 90.5% in the presence of Fe/AC(2g/L) and hydrogen peroxide (0.5 %) at pH value 7 after 5 hours under normal temperature and atmospheric pressure. Kinetic studies of the degradation reaction show that the degradation rate of phenol nearly follows the first-order reaction. The reaction rate constant and activity energy are 0.4162 min-1 and 23.64 kJ/mol at 25°C, respectively.

Understanding the risks and rewards of using 50% vs. 10% strength peroxide in pulp bleach plants

TAPPI Journal ◽  
2018 ◽  
Vol 17 (11) ◽  
pp. 601-607
Author(s):  
Alan Rudie ◽  
Peter Hart
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Rate ◽  
The Other ◽  
Mechanical Pulp ◽  
Engineering Controls ◽  
Point Of Use ◽  
Process Failure

The use of 50% concentration and 10% concentration hydrogen peroxide were evaluated for chemical and mechanical pulp bleach plants at storage and at point of use. Several dangerous occurrences have been documented when the supply of 50% peroxide going into the pulping process was not stopped during a process failure. Startup conditions and leaking block valves during maintenance outages have also contributed to explosions. Although hazardous events have occurred, 50% peroxide can be stored safely with proper precautions and engineering controls. For point of use in a chemical bleach plant, it is recommended to dilute the peroxide to 10% prior to application, because risk does not outweigh the benefit. For point of use in a mechanical bleach plant, it is recommended to use 50% peroxide going into a bleach liquor mixing system that includes the other chemicals used to maintain the brightening reaction rate. When 50% peroxide is used, it is critical that proper engineering controls are used to mitigate any risks.

Pengaruh Luka Iris Pada Tikus Dengan Paparan Hidrogen Peroxida 3% terhadap Epitelisasi dan Pembentukan Eksudat pada Permukaan Epitel Kulit.

2020 ◽  
Vol 17 (2) ◽  
pp. 172
Author(s):  
HARMAN AGUSAPUTRA ◽  
MARIA SUGENG ◽  
AYLY SOEKAMTO ◽  
ATIK WULANDARI
Keyword(s):  
Hydrogen Peroxide ◽  
Wound Healing ◽  
The Other ◽  
Delayed Wound Healing ◽  
Peroxide Group ◽  
Hemostatic Effect ◽  
Significant Difference ◽  
Negative Effect ◽  
Wound Healing Effect ◽  
Epithelial Growth

<p><strong>Abstract</strong></p><p><strong>Background:</strong> Hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) as antiseptic has been used frequently to clean woundsin in hospitals and clinics. Hydrogen peroxide has the effectof strong oxidative that can kill pathogens. It can clean up debris and necrotic tissuesin wounds. Hydrogen peroxidealso has hemostatic effect that can help to stop bleeding. Besides antiseptic effects, hydrogen peroxide i s suspected of having negative effect in wound healing. Hydrogen peroxide presumably could cause delayed wound healing by exudate formation and delayed epithelial growth.</p><p><strong>Method</strong>: This study was conducted in the laboratory using 48 white mice that were divided into 2 groups. All the mice were purposely wounded. Afterwards in one group the wounds were clean up using hydrogen peroxide, while in the other group without hydrogen peroxide as control. The wounds of both groups were observed on day 1, day 3 and day 7. On day 1 and day 3, both groups did not show significant difference.</p><p><strong>R</strong><strong>esult</strong> : on day 7 showed that the wound healing in hydrogen peroxide group were delayed. Fifty percent of them had the formation of exudate and 62.5% of them showed delayed epithelial growth.</p><p><strong>Conclusion </strong>: This study could show hydrogen peroxide as wound antiseptic has delayed wound healing effect.</p><p><strong>Keyword</strong>: hydrogen peroxide, wound healing</p>

Antimicrobial Effect of 940 nm Diode Laser based on Photolysis of Hydrogen Peroxide in the Treatment of Periodontal Disease

2018 ◽  
Vol 69 (8) ◽  
pp. 2081-2088 ◽  
Author(s):  
Alin Alexandru Odor ◽  
Edwin Sever Bechir ◽  
Deborah Violant ◽  
Victoria Badea
Keyword(s):  
Hydrogen Peroxide ◽  
Laser Therapy ◽  
Diode Laser ◽  
Antimicrobial Effect ◽  
The Other ◽  
Control Group ◽  
Group 4 ◽  
Periodontal Bacteria ◽  
Severe Periodontitis ◽  
Before And After

Moderate and severe periodontitis represents a challenge in the non-surgical periodontal therapy. Due to the lack of evidence regarding the antimicrobial effectiveness of 940 nm diode laser in periodontal treatment, this study aimed to evaluate the antimicrobial effect of hydrogen peroxide (H2O2) photolysis performed with 940 nm diode laser in the treatment of moderate and severe periodontitis. Twenty-five patients with 100 teeth were selected for this pilot study. The test teeth were randomly assigned to one of the four treatment groups: Group 1: scaling and root planning (SRP) (control group); and the following experimental groups: Group 2: H2O2; Group 3: 940 nm diode laser therapy; Group 4: 940 nm diode laser therapy and H2O2. Clinical examinations, like probing depth (PD), clinical attachment level (CAL) and bleeding on probing (BOP) were performed before and after the treatment. The microbiological evaluation, effectuated before and after the treatment, included nine periodontal bacteria species and investigated by means of real-time PCR assay. The clinical and bacterial differences in the tested groups, was assessed between control group and the other three experimental groups, as well as between the experimental groups. The total bacteria load was reduced for all four studied groups. Group 4 (diode laser + H2O2) showed significant bacterial reduction of the major periodontal bacteria like Pg., Tf., Td., Pi., Pm., Fn (p[0.001) than the other 3 groups (p]0.001). Also the periodontal clinical parameters, like PD, CAL and BOP showed a significant reduction after the photolysis of H2O2 with the 940 nm diode laser (p[0.001). Differences between tested groups showed a significant beneficial results in regard to Group 4.It is suggested that the photoactivation of H2O2 with the 940 nm diode laser can be used successfully in adjunctive to the non-surgical periodontal treatment as a bactericidal tool.

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