scholarly journals Optimization of isopropyl alcohol degradation by microwave-induced catalytic oxidation process

2019 ◽  
Vol 9 (3) ◽  
pp. 213-224
Author(s):  
Quynh Thi Phuong Tran ◽  
Chi-Hsu Hsieh ◽  
Tung-Yu Yang ◽  
Hsin-hsin Tung
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Oxidation ◽  
Working Conditions ◽  
Isopropyl Alcohol ◽  
Oxidation Process ◽  
Removal Rate ◽  
Response Variability ◽  
Manufacturing Industries ◽  
Independent Variables ◽  
Central Composite

Abstract Isopropyl alcohol (IPA) is a common waste solvent from the semiconductor and optoelectronic manufacturing industries. The current study assesses the feasibility of microwave-induced catalytic oxidation process for synthetic IPA wastewater. The effect of three independent variables, including oxidant (hydrogen peroxide), initial IPA concentration, and dosage of catalyst (granular activated carbon, GAC) on the IPA removal efficiency, were investigated and optimized by response surface methodology based on central composite design. The estimated optimal working conditions were as follows: [H2O2] <0.132 M, GAC dosage = 108–123 g/L, and initial [IPA] = 0.038–0.10 M. The findings indicated that the dosage of GAC and the initial IPA concentration strongly affected the overall IPA removal. The values of R2 = 0.9948 and adjusted R2 = 0.9901 demonstrated that the response variability could be explained by the model expressing a satisfactory quadratic fit. Finally, the H2O2/GAC/MW process showed a faster and higher IPA removal rate than other processes tested.

Treatment of Imidacloprid Pesticide Wastewater by Microwave-Assisted Catalytic Oxidation

2012 ◽  
Vol 610-613 ◽  
pp. 2023-2027 ◽  
Author(s):  
Xiao Yi Bi ◽  
Hai Yan Yang ◽  
Pei Shi Sun ◽  
Xiao Yi Xu
Keyword(s):  
Hydrogen Peroxide ◽  
Activated Carbon ◽  
Catalytic Oxidation ◽  
Working Conditions ◽  
Ph Value ◽  
Irradiation Time ◽  
Removal Rate ◽  
Microwave Assisted ◽  
Cod Removal Rate ◽  
Carbon Catalysts

In this study, modified activated carbon used as catalysts treat imidacloprid pesticide wastewater with microwave-assisted catalytic oxidation. The effect of working conditions such as hydrogen peroxide concentration, homogeneous catalysts concentration of Fe2+, amount of activated carbon catalysts, microwave power, irradiation time, wastewater temperature, and pH value on the treatment of imidacloprid pesticide wastewater in the process was investigated. The results show that COD removal rate , can reach 89.25%, with the following working conditions : imidacloprid pesticide wastewater with initial concentration of 268mg/ L , 100 mL ; hydrogen peroxide solution added at a concentration of 26.52g/L , Fe2+ concentration ,109.81mg/L; amount of activated carbon catalysts, 5g;power of microwave , 119 W; irradiation time , 4min ; pH value , 6.

Removal of Tetracycline Antibiotic from Wastewater by Fenton Oxidation Process

2021 ◽  
Vol 39 (2A) ◽  
pp. 260-267
Author(s):  
Mahdi H. Mahdi ◽  
Thamer J. Mohammed ◽  
Jenan A. Al-Najar
Keyword(s):  
Hydrogen Peroxide ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Synthetic Wastewater ◽  
Independent Variables ◽  
Reagent Treatment ◽  
Tetracycline Degradation ◽  
Fenton Oxidation Process ◽  
Time Required ◽  
Central Composite

This study aimed to remove the antibiotic tetracycline from a sample of synthetic wastewater using an advanced oxidation process by Fenton's reagent treatment. Central Composite Design (CCD) software was used to reduce the number of tests required to remove tetracycline. The independent variables identified in batch oxidation experiments are the concentrations of tetracycline (40–250 mg / L), hydrogen peroxide (20–600 mg / L), and Fe(II) (0–60 mg / L). The rate of tetracycline degradation was significantly influenced by the concentration of hydrogen peroxide and tetracycline. The reaction time required for tetracycline removal was determined to be 15 minutes. The optimal ratio of independent variants leading to complete degradation 100% of tetracycline was hydrogen peroxide / Fe2 + / tetracycline 310/30/145 mg / l.

scholarly journals Degradation of cyanide, aniline and phenol in pre-treated coke oven wastewater by peroxide assisted electro-oxidation process

2018 ◽  
Vol 78 (10) ◽  
pp. 2214-2227 ◽  
Author(s):  
Hariraj Singh ◽  
Brijesh Kumar Mishra
Keyword(s):  
Hydrogen Peroxide ◽  
Current Density ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Removal Rate ◽  
Operating Cost ◽  
Coke Oven ◽  
Graphite Electrodes ◽  
Electro Oxidation ◽  
Pre Treatment

Abstract The present study explored the feasibility of using graphite electrodes for the electrochemical oxidation of cyanide, thiocyanate, phenol and aniline with hydrogen peroxide. The dosing effects of hydrogen peroxide and current density were examined in the pre-treated coke oven wastewater. It was found that 0.025 M hydrogen peroxide and 13.63 mA/cm2 of current density were more favorable for the removal of 100%, 90%, 71% and 40% cyanide, thiocyanate, phenol and aniline respectively. The increased removal of phenol in the coke oven wastewater was attributed to the pre-treatment of wastewater. Initially, 28% phenol was converted to phenolate ion by air stripping process, which increased the removal rate of phenol by the electro-oxidation process as the removal of phenolate is quite easy compared to phenol. The advanced oxidation process degrades the more toxic cyanide into less toxic intermediate cyanate ions (CNO─), which further cut down into nontoxic end products such as N2, HCO3 and CO2. The experimental results show that the primary mechanisms in the oxidation of cyanide and phenol are mediated electro-oxidation by hydroxyl radicals and hypochlorite ions. The operating cost under the optimized conditions for the removal of 100% cyanide and 71% phenol was estimated to be 616.95 INR/m3.

Heterogeneous catalytic oxidation of hypophosphite by H2O2: pH effect

2007 ◽  
Vol 55 (12) ◽  
pp. 89-93 ◽  
Author(s):  
C.-C. Hung ◽  
Y.-H. Huang ◽  
C.-Y. Chen
Keyword(s):  
Hydrogen Peroxide ◽  
Iron Oxide ◽  
Catalytic Oxidation ◽  
Organic Contaminants ◽  
Oxide Catalyst ◽  
Removal Rate ◽  
Ph Effect ◽  
Fluidised Bed ◽  
Heterogeneous Catalytic ◽  
Iron Oxide Catalyst

Phosphorus chemicals control key aspects of eutrophication and other environmental process. Hypophosphite (HP) originating from manmade and natural sources was evidenced as present in the environment and was investigated rarely. Recently, iron oxide has been used as a catalyst for oxidising organic contaminants with hydrogen peroxide (i.e. heterogeneous Fenton-like reaction). This study focused mainly on the oxidation of 1.0 mM HP by hydrogen peroxide in the presence of a novel iron oxide catalyst (B1 catalyst) which was prepared through a fluidised-bed Fenton reactor (FBR-Fenton). The background experiments including the oxidation experiment of HP by air only, by H2O2 only and adsorption of HP by B1 catalyst were first elucidated. It was found that HP could not be oxidised at all by air and H2O2 at pH 2.5–12 in 24 hours. On the other hand, it could be adsorbed by B1 catalyst with 89.8% removal at pH 2.5 in 5 hours and complete desorption at pH 11.0. Then, we investigated the effects of pH and Fe leaching from the catalyst on the oxidative efficiency of HP. We found that although the removal rate of HP at pH 2.5 is faster than that at pH 4.0, B1 catalyst has a higher HP oxidation efficiency at pH 4.0 than that at pH 2.5. We conclude that it is a major heterogeneous catalytic oxidation by our novel iron oxide catalyst to oxidise HP at pH 4.0. Also, B1 could be a useful and potential catalyst for the treatment of HP wastewater.

Hydrogen Peroxide/Iron Oxide -Induced Catalytic Oxidation of Organic Compounds

2002 ◽  
Vol 5 (2) ◽  
Author(s):  
Mirat D. Gurol ◽  
Shu-Sung Lin
Keyword(s):  
Hydrogen Peroxide ◽  
Iron Oxide ◽  
Catalytic Oxidation ◽  
Organic Compounds ◽  
Oxidation Process ◽  
Heterogeneous Catalytic ◽  
Oxidation Of Organic Compounds

AbstractThis paper describes a novel heterogeneous catalytic oxidation process involving the use of hydrogen peroxide (H

scholarly journals Cyanide Containing Wastewater Treatment by Ozone Enhanced Catalytic Oxidation over Diatomite Catalysts

2018 ◽  
Vol 142 ◽  
pp. 01003
Author(s):  
Mingguo Lin ◽  
Qiyuan Gu ◽  
Xinglan Cui ◽  
Xingyu Liu
Keyword(s):  
Catalytic Oxidation ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Removal Rate ◽  
Order Rate Constant ◽  
Alkaline Condition ◽  
First Order ◽  
First Order Kinetics ◽  
Initial Ph ◽  
The One

Cyanide containing wastewater that discharged from gold mining process creates environmental problems due to the toxicity of cyanide. As one of the promising advanced oxidation process, catalytic oxidation with ozone is considered to be effective on the purification of cyanide. Diatomite, a natural mineral, was used as catalyst in this study. The effect of O3 dosage, salinity, initial cyanide concentration and initial pH condition were investigated. It was observed that the removal rate of cyanide was much higher in the catalytic oxidation with ozone process than the one in zone alone process. Alkaline condition was especially favorable for cyanide in catalytic oxidation with ozone. The ozone and catalytic oxidation with ozone were simulated by pseudo-first-order kinetics model. The apparent first-order rate constant contribution of the diatomite catalyst was 0.0757 min-1, and the contribution percentage was 65.77%.

Microwave – Induced Oxidation Progress for Treatment of Imidacloprid Pesticide Wastewater

2012 ◽  
Vol 229-231 ◽  
pp. 2489-2492 ◽  
Author(s):  
Xiao Yi Bi ◽  
Hai Yan Yang ◽  
Pei Shi Sun
Keyword(s):  
Working Conditions ◽  
Oxidation Process ◽  
Ph Value ◽  
Irradiation Time ◽  
Removal Rate ◽  
H2o2 Concentration ◽  
Peroxide Oxidation ◽  
Initial Concentration ◽  
Effective Technology ◽  
Cod Removal Rate

The microwave-induced hydrogen peroxide oxidation process was used for the treatment of synthetic imidacloprid pesticide wastewater, which the initial concentration of COD was 268mg/L. The results showed that COD removal rate could reach 50.06% with the following working conditions: imidacloprid pesticide wastewater 100mL, H2O2 concentration 26.52g/L, microwave power 119W, irradiation time 1min, pH value 6. It provides an effective technology for the removal of imidacloprid pesticide wastewater.

Heterogeneous Fenton Catalytic Removal of Organic Pollutant in Aqueous Solution by using Coal Gangue as a Catalyst

2019 ◽  
Vol 12 (4) ◽  
pp. 312-325
Author(s):  
Jiwei Zhang ◽  
Jingjing Xu ◽  
Shuaixia Liu ◽  
Baoxiang Gu ◽  
Feng Chen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Hydroxyl Radical ◽  
Removal Rate ◽  
Organic Pollutant ◽  
Coal Gangue ◽  
Ion Leakage ◽  
Heterogeneous Fenton ◽  
Solution Ph ◽  
X Ray

Background: Coal gangue was used as a catalyst in heterogeneous Fenton process for the degradation of azo dye and phenol. The influencing factors, such as solution pH gangue concentration and hydrogen peroxide dosage were investigated, and the reaction mechanism between coal gangue and hydrogen peroxide was also discussed. Methods: Experimental results showed that coal gangue has the ability to activate hydrogen peroxide to degrade environmental pollutants in aqueous solution. Under optimal conditions, after 60 minutes of treatment, more than 90.57% of reactive red dye was removed, and the removal efficiency of Chemical Oxygen Demand (COD) up to 72.83%. Results: Both hydroxyl radical and superoxide radical anion participated in the degradation of organic pollutant but hydroxyl radical predominated. Stability tests for coal gangue were also carried out via the continuous degradation experiment and ion leakage analysis. After five times continuous degradation, dye removal rate decreased slightly and the leached Fe was still at very low level (2.24-3.02 mg L-1). The results of Scanning Electron Microscope (SEM), energy dispersive X-Ray Spectrometer (EDS) and X-Ray Powder Diffraction (XRD) indicated that coal gangue catalyst is stable after five times continuous reuse. Conclusion: The progress in this research suggested that coal gangue is a potential nature catalyst for the efficient degradation of organic pollutant in water and wastewater via the Fenton reaction.

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