Effect of Fe (II) concentration on metronidazole degradation by Fenton process: Performance and Kinetic study

MRS Advances ◽  
2020 ◽  
Vol 5 (62) ◽  
pp. 3265-3272
Author(s):  
Donovan R. Ramírez-Carranza ◽  
G. Macedo-Miranda ◽  
G. González-Blanco ◽  
S. Mireya-Martínez ◽  
Julio C. González-Juárez ◽  
...  
Keyword(s):  
Reaction Time ◽  
Kinetic Model ◽  
Molar Ratio ◽  
Process Performance ◽  
Fenton Process ◽  
Experimental Conditions ◽  
Batch Studies ◽  
First Order ◽  
Antibiotic Drug ◽  
Optimal Ph

AbstractMetronidazole (MNZ) is an antibiotic drug to be carcinogenic and mutagenic. The present work was focused on MNZ degradation using the Fenton process, in batch studies. Five initial concentrations of MNZ (0.5, 5, 10, 15 and 20 mg/L), three Fe (II) concentrations (2.94, 5.88 and 11.66 μM), 29.4 μM H2O2, and three pH (3.5, 5 and 7) were evaluated at a reaction time of 5 min. A statistical factorial design using the program Minitab 18® was used to study the MNZ degradation. The best experimental conditions to degrade MNZ at 100% was 2.94 μM Fe2+ and pH of 3.5. Three kinetic models were used to study the degradation profile of MNZ at 2.94 μM Fe2+ and 29.4 μM H2O2, such as the first-order, the second-order, and BMG kinetic model. The BMG kinetic model was the best model to describe the MNZ degradation by Fenton process. On other hand, the optimal pH for MNZ degradation was 3.5, independently of the molar ratio Fe2+/H2O2 evaluated. At pH 5, degradation efficiencies decreased significantly, while at pH 7 the lowest degradation of MNZ was observed. Finally, the Fenton process showed the potential to degrade metronidazole.

scholarly journals Municipal Leachate Treatment by Fenton Process: Effect of Some Variable and Kinetics

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Mohammad Ahmadian ◽  
Sohyla Reshadat ◽  
Nader Yousefi ◽  
Seyed Hamed Mirhossieni ◽  
Mohammad Reza Zare ◽  
...  
Keyword(s):  
Reaction Time ◽  
Color Removal ◽  
Molar Ratio ◽  
Order Kinetic ◽  
Fenton Process ◽  
Solution Ph ◽  
Leachate Treatment ◽  
First Order ◽  
Order Kinetic Model ◽  
Better Than

Due to complex composition of leachate, the comprehensive leachate treatment methods have been not demonstrated. Moreover, the improper management of leachate can lead to many environmental problems. The aim of this study was application of Fenton process for decreasing the major pollutants of landfill leachate on Kermanshah city. The leachate was collected from Kermanshah landfill site and treated by Fenton process. The effect of various parameters including solution pH, Fe2+and H2O2dosage, Fe2+/H2O2molar ratio, and reaction time was investigated. The result showed that with increasing Fe2+and H2O2dosage, Fe2+/H2O2molar ratio, and reaction time, the COD, TOC, TSS, and color removal increased. The maximum COD, TOC, TSS, and color removal were obtained at low pH (pH: 3). The kinetic data were analyzed in term of zero-order, first-order, and second-order expressions. First-order kinetic model described the removal of COD, TOC, TSS, and color from leachate better than two other kinetic models. In spite of extremely difficulty of leachate treatment, the previous results seem rather encouraging on the application of Fenton’s oxidation.

Degradation of water polluted with used cooking oil by solar photolysis, Fenton and solar photo Fenton

2010 ◽  
Vol 62 (1) ◽  
pp. 77-84 ◽  
Author(s):  
J. Vergara-Sánchez ◽  
S. Silva-Martínez
Keyword(s):  
Reaction Time ◽  
Oxygen Demand ◽  
Solar Irradiation ◽  
Molar Ratio ◽  
Fenton Process ◽  
Experimental Conditions ◽  
Operating Variables ◽  
Used Cooking Oil ◽  
Solar Photolysis ◽  
Oil Concentration

The degradation of used cooking safflower oil aqueous solutions by photolysis, Fenton, and photo Fenton under solar light is reported. The processes were carried out in a photochemical reactor with recirculation. Operating variables such as, pH, oil concentration and molar ratio of [H2O2]:[oil] were investigated to test their effects on the treatment efficiency of Fenton process. Also the iron catalyzed decomposition of hydrogen peroxide in the solar photo Fenton reaction was studied under different experimental conditions. The degree of oil oxidation was monitored by the measurements of chemical oxygen demand (COD) analyses. It was found that at pH 2.6 and a molar ratio of [H2O2]:[oil] of 489:1 were more efficient for COD abatement. The experimental results showed that the sole effect of the solar irradiation (photolysis) aided to decrease ∼65% of COD at neutral pH in a reaction time period of 15 h; whereas a decrease of 47% and ∼90% of COD was obtained by Fenton and photo Fenton treatment, respectively, after a reaction time of 50 min. It was observed a decrease in the decomposition of H2O2 in the solar photo Fenton process, in subsequent additions of H2O2, and H2O2 + Fe2+.

scholarly journals Treatment of hazardous waste landfill leachate using Fenton oxidation process

2018 ◽  
Vol 34 ◽  
pp. 02034 ◽  
Author(s):  
Pradeep Kumar Singa ◽  
Mohamed Hasnain Isa ◽  
Yeek-Chia Ho ◽  
Jun-Wei Lim
Keyword(s):  
Reaction Time ◽  
Hazardous Waste ◽  
Landfill Leachate ◽  
Molar Ratio ◽  
Oh Radicals ◽  
Fenton Reagent ◽  
Leachate Treatment ◽  
Experimental Conditions ◽  
Waste Landfill ◽  
Hazardous Waste Landfill

The efficiency of Fenton’s oxidation was assessed in this study for hazardous waste landfill leachate treatment. The two major reagents, which are generally employed in Fenton’s process are H2O2 as oxidizing agent and Fe2+ as catalyst. Batch experiments were conducted to determine the effect of experimental conditions viz., reaction time, molar ratio, and Fenton reagent dosages, which are significant parameters that influence the degradation efficiencies of Fenton process were examined. It was found that under the favorable experimental conditions, maximum COD removal was 56.49%. The optimum experimental conditions were pH=3, H2O2/Fe2+ molar ratio = 3 and reaction time = 150 minutes. The optimal amount of hydrogen peroxide and iron were 0.12 mol/L and 0.04 mol/L respectively. High dosages of H2O2 and iron resulted in scavenging effects on OH• radicals and lowered degradation efficiency of organic compounds in the hazardous waste landfill leachate.

scholarly journals Kinetics of Biodiesel Synthesis Using Used Frying Oil through Transesterification Reaction

2020 ◽  
Vol 9 (1) ◽  
pp. 1-11
Author(s):  
Agus Haryanto ◽  
Amieria Citra Gita ◽  
Tri Wahyu Saputra ◽  
Mareli Telaumbanua
Keyword(s):  
Reaction Time ◽  
Frying Oil ◽  
Transesterification Reaction ◽  
Biodiesel Production ◽  
Molar Ratio ◽  
Order Kinetic ◽  
Used Frying Oil ◽  
First Order ◽  
Biodiesel Synthesis ◽  
Kinetics Of

This research aims to study the first-order kinetics of biodiesel production from used frying oil (UFO) through transesterification with methanol. Used frying oil was collected from fried peddlers around the campus of the University of Lampung. Technical grade methanol and NaOH catalyst were purchased from a local chemical supplier. The experiment was carried out with 100 ml of UFO at various combinations of oil to methanol molar ratio (1:4, 1:5, and 1:6), reaction temperatures(30 to 55oC, the ramping temperature of 5o C), and reaction time of 0.25 to 10 minutes. First-order kinetic was employed using 126 data pairs (87.5%). The acquired kinetic model was validated using 18 data sets (12.5%) observed at a reaction time of eight min. Results show that biodiesel yield was increased with reaction time, its molar ratio, and temperature. The maximum return of 78.44% was achieved at 55oC and molar ratio of 1:6. The kinetic analysis obtains the reaction rate constant (k) in the range of 0.045 to 0.130. The value of k increases with the reaction temperature and molar ratio. The analysis also reveals the average activation energy (Ea) of the UFO transesterification reaction with methanol and NaOH catalyst to be 21.59 kJ/mol. First-order kinetic is suitable to predict biodiesel yield from UFO because of low %RMSE (3.39%) and high R2 (0.8454

scholarly journals Utilization of copper plating effluents in the degradation of the dye Sanodure Green in the presence of H2O2

Chemija ◽  
2021 ◽  
Vol 32 (1) ◽  
Author(s):  
Edita Sodaitienė ◽  
Danutė Kaušpėdienė ◽  
Audronė Gefenienė ◽  
Vladas Gefenas ◽  
Romas Ragauskas ◽  
...  
Keyword(s):  
Reaction Time ◽  
Kinetic Model ◽  
Oxidative Degradation ◽  
Order Kinetic ◽  
Nanostructured Catalyst ◽  
Copper Plating ◽  
First Order ◽  
Order Kinetic Model ◽  
Degradation Reaction ◽  
Pseudo First Order

Oxidative degradation of metal complex dye Sanodure Green (SG) in the presence of H2O2 and nanostructured catalyst CuO prepared from copper plating effluents has been investigated. The activity of the CuO catalyst in the oxidative degradation reaction depended on the SG concentration, reaction time and temperature. The reaction followed a pseudo-first order kinetic model, and the rate constant was highly dependent on the increase in temperature, but only slightly on the SG concentration. Thermodynamic studies have shown that the degradation reaction of SG is endothermic. The use of copper plating effluents for the preparation of nanostructured catalyst CuO makes it possible to avoid the accumulation of difficult-to-recycle copper oxide sludge formed during effluent neutralization, and to manage copper plating and aluminum dyeing effluents more economically.

Oxidation of acetyl-pyrimidine wastewater by Fenton process

2010 ◽  
Vol 62 (11) ◽  
pp. 2630-2636 ◽  
Author(s):  
Xuesong Yi ◽  
Liping Sun ◽  
Jingjie Yu ◽  
Shaopo Wang ◽  
Shuili Yu
Keyword(s):  
Activation Energy ◽  
Reaction Time ◽  
Control Experiment ◽  
Reactive System ◽  
Fenton Process ◽  
Batch Experiments ◽  
Fenton Reagent ◽  
First Order ◽  
Contaminant Degradation ◽  
Order Rate Equation

In this study, contaminant degradation, priority performance, intermediates, and kinetics in catalytic oxidation of Acetyl-Pyrimidine wastewater by Fenton reagent were investigated. In batch experiments, the main parameters that govern the complex reactive system, i.e. temperature, pH, Fe2 + , and H2O2 initial concentrations have been studied. The results showed total COD and Acetyl-Pyrimidine removal was above 50% and 90% respectively under the following oxidation conditions: T at 25°C, pH at 3.5, H2O2 at 300 mmol/l, Fe2 +  at 40 mmol/l, with the reaction time 2 h. Control experiment and UV-Infrared spectrums analysis indicated that Acetyl-Pyrimidine was removed prior to the small molecule organic. The reaction fit to a first-order rate equation and the activation energy of Pyrimidine was 2.365 kJ/mol.

scholarly journals Mineralization of Hazardous Waste Landfill Leachate using Photo-Fenton Process

2018 ◽  
Vol 65 ◽  
pp. 05012 ◽  
Author(s):  
Pradeep Kumar Singa ◽  
Mohamed Hasnain Isa ◽  
Yeek-Chia Ho ◽  
Jun-Wei Lim
Keyword(s):  
Reaction Time ◽  
Operating Conditions ◽  
Cod Removal ◽  
Molar Ratio ◽  
Optimum Operating ◽  
Fenton Process ◽  
Batch Mode ◽  
Fenton Reagents ◽  
Uv Lamp ◽  
Fenton Oxidation Process

This study was conducted to evaluate the COD removal efficiency of Photo-Fenton oxidation process. The reagents used in the Photo-Fenton process are catalyst Fe2+ and H2O2 as oxidizing agent. A 16W UV lamp was used to carry out the experiments. All the experiments were performed in batch mode to investigate the influence of operating conditions viz., Fenton reagents dosage, molar ratio and reaction time. The maximum COD removal observed was 68% under optimum operating conditions. The operating conditions H2O2/Fe2+ molar ratio = 3 and reaction time = 90 minutes were found to optimum. The dosages of Fenton reagents i.e. hydrogen peroxide and Fe2+ were optimum at 0.09 mol/L and 0.03 mol/L respectively.

Optimization of Fenton Process for Removal Organic Substance in Landfill Leachate

2012 ◽  
Vol 518-523 ◽  
pp. 2165-2169
Author(s):  
Fu Geng Zha ◽  
Guo Chun Xu ◽  
Xiao Qing Chen ◽  
Ming Xu Zhang
Keyword(s):  
Reaction Time ◽  
Landfill Leachate ◽  
Organic Substance ◽  
Operating Conditions ◽  
Molar Ratio ◽  
Fenton Process ◽  
Optimal Conditions ◽  
Temperature Influence ◽  
Batch Mode ◽  
Fenton's Reagent

The treatment of landfill leachate by Fenton process was carried out in a batch mode. The effect of operating conditions such as reaction time, pH, dosage of H2O2 and [H2O2]/[Fe2+] molar ratio and temperature on the efficacy of Fenton process was investigated. It is demonstrated that Fenton’s reagent can effectively degrade leachate organics in 30 min. The optimal conditions were pH was 3, dosage of H2O2 was 2 times of theoretical stoichiometry, [H2O2]/[Fe2+] molar ratio was 5, temperature influence the removal efficency relatively small compared to other factors.

scholarly journals Improvement of Solar Photo-Fenton by Extracts of Amazonian Fruits for the Degradation of Pharmaceuticals in Municipal Wastewater

2021 ◽  
Author(s):  
Lis Manrique-Losada ◽  
Heidy L Santanilla-Calderón ◽  
Efraím A Serna-Galvis ◽  
Ricardo Torres-Palma
Keyword(s):  
Municipal Wastewater ◽  
Molar Ratio ◽  
Complexing Agent ◽  
Process Performance ◽  
Fenton Process ◽  
Soluble Iron ◽  
Iron Precipitation ◽  
Pharmaceuticals Degradation ◽  
Iron Forms ◽  
Amazonian Fruits

Abstract Extracts of copoazu (Theobroma gramdiflorum), canangucha (Maurita Flexuosa), and coffee (coffea arabica) were explored as enhancers of the solar photo-Fenton process to eliminate acetaminophen, sulfamethoxazole, carbamazepine, and diclofenac. The process performance, at pH 6.2 and 5 mg L− 1 of iron without the extracts, has a very limited action (~ 35% of the pollutants degradation at 90 min of treatment) due to the iron precipitation. Interestingly, the extracts addition increased the soluble iron forms but only copoazu extract improved the pollutants degradation (~ 95% of elimination at 90 min of the process action). The copoazu extract acted as a natural complexing agent, maintaining the soluble iron up to 2 mg L− 1 even after 90 min, and consequently enhancing the pollutants degradation. The effect of copoazu extract dose on the process performance was also assessed, finding that an iron: copoazu extract molar ratio equal to 1:0.16 was the most favorable condition. Then, the process improved by copoazu extract was applied to municipal wastewater. Remarkably, the process led to ~ 90% of total pharmaceuticals degradation at 20 min of treatment. This work evidences the feasibility of amazonian fruits extracts to improve the solar photo-Fenton process to degrade pharmaceuticals in aqueous matrices at near-neutral pH.

Pilot Study on Removal and Recovery of Nitrogen and Phosphorus in Human Urine by Crystallization of Magnesium Ammonium Phosphate

2010 ◽  
Vol 113-116 ◽  
pp. 2310-2313
Author(s):  
Qiang Liu ◽  
Yu Lan Tang ◽  
Jing Xiang Fu ◽  
Yu Hua Zhao ◽  
Zhi Wang
Keyword(s):  
Reaction Time ◽  
Human Urine ◽  
Ammonium Phosphate ◽  
Molar Ratio ◽  
Nitrogen And Phosphorus ◽  
Experimental Conditions ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium ◽  
Initial Ph ◽  
Removal And Recovery

Laboratory-scale tests for removal and recovery of nitrogen and phosphorus in human urine were conducted by magnesium ammonium phosphate precipitation (MAP) method. Proper Na2HPO4•12H2O as a phosphorus source and MgCl2•6H2O as a magnesium source were added to adjust the ratio of Mg2+, NH4+and PO43-. The effects of initial pH, (Mg2+): n (NH4+), n (PO43-) : n (NH4+), temperature, reaction time and stirring speed on removal and recovery of nitrogen and phosphorus in urine were studied by MAP method. Results showed that the optimum experimental conditions were at room temperature, pH, the molar ratio of Mg2+：PO43-：NH4+, reaction time and stirring speed were set 10, 1.2:1:0.9, 30min and 100r/min.

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