The Bimetallic Synergistic Effect in Heterogeneous UV/Fenton System for the Treatment of Refractory 6-Nitryl Wastewater

2014 ◽  
Vol 881-883 ◽  
pp. 279-282 ◽  
Author(s):  
Wei Xiong ◽  
De Rong Liu ◽  
Guo Yuan Yuan ◽  
Qi Wei ◽  
Quan Sen Dang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Wastewater Treatment ◽  
Synergistic Effect ◽  
Molecular Sieve ◽  
Degradation Rate ◽  
Impregnation Method ◽  
Heterogeneous Fenton ◽  
Reaction Conditions ◽  
Optimal Reaction ◽  
Fenton System

Nowadays, ultraviolet (UV) irradiation heterogeneous Fenton-like reactions have widespread used in organic wastewater treatment. In this paper, Fe2+ and Cu2+ were load in Na-Y molecular sieve using impregnation method. Fe-Y, Cu-Y and Fe-Cu-Y catalysts were obtained. The Fe-Cu-Y catalyst showed good performance in the degradation of 6-nitryl wastewater. When the volume of 6-nitryl wastewater is 100 mL, the optimal reaction conditions were found to be 3mL of hydrogen peroxide, 7.5g of catalyst weight, 250W of UV power. Under these conditions, the degradation rate of CODCr can be up to 97.0%.

Study on Catalytic Performance of Supported HPW/C Catalyst for Diethyl Adipate Synthesis

2012 ◽  
Vol 468-471 ◽  
pp. 1371-1374
Author(s):  
Ke Nian Wei ◽  
Bin Zhou ◽  
Jiang Quan Ma ◽  
Yan Wang
Keyword(s):  
Physical Chemistry ◽  
Reaction Time ◽  
Adipic Acid ◽  
Acid Content ◽  
Catalytic Performance ◽  
Impregnation Method ◽  
Reaction Conditions ◽  
Catalyst Amount ◽  
Reaction Performance ◽  
Optimal Reaction

HPW/C catalysts were prepared using impregnation method. The physical chemistry properties of the catalysts were characterized employing XRD and NH3-TPD.The effects of HPW loading, catalyst amount and reaction time on the catalyst performances were investigated. The results more acid content and active center contribute to the reaction performance. Under the optimal reaction conditions of 0.8g 29%(w) HPW/C as the catalyst, n(adipic acid): n(ethanol):n(toluene)=1:6:1,5h,the etherification rate was 97.3%.

scholarly journals Heterogeneous Fenton-Like Catalytic Degradation of 2,4-Dichlorophenoxyacetic Acid by Nano-Scale Zero-Valent Iron Assembled on Magnetite Nanoparticles

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2909 ◽  
Author(s):  
Xiaofan Lv ◽  
Yiyang Ma ◽  
Yangyang Li ◽  
Qi Yang
Keyword(s):  
Hydrogen Peroxide ◽  
Synergistic Effects ◽  
Degradation Process ◽  
Zero Valent Iron ◽  
Dichlorophenoxyacetic Acid ◽  
Heterogeneous Fenton ◽  
Reaction Conditions ◽  
Nano Zero Valent Iron ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Better Than

Fe0@Fe3O4 nanoparticles with dispersibility and stability better than single nano zero-valent iron (nZVI) were synthesized and combined with hydrogen peroxide to constitute a heterogeneous Fenton-like system, which was creatively applied in the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D). The effects of different reaction conditions like pH, hydrogen peroxide concentration, temperature, and catalyst dosage on the removal of 2,4-D were evaluated. The target pollutant was completely removed in 90min; nearly 66% of them could be mineralized, and the main intermediate product was 2,4-dichlorophenol. Synergistic effects between nZVI and Fe3O4 made the 2,4-D degradation efficiency in the Fe0@Fe3O4/H2O2 system greater than in either of them alone. More than a supporter, Fe3O4 could facilitate the degradation process by releasing ferrous and ferric ions from the inner structure. The reduction of 2,4-D was mainly attributed to hydroxyl radicals including surface-bound ∙OH and free ∙OH in solution and was dominated by the former. The possible mechanism of this Fe0@Fe3O4 activated Fenton-like system was proposed.

Distribution of Fe(II) Concentration during Degradation of Rhodamine B by Fenton Reagent

2011 ◽  
Vol 261-263 ◽  
pp. 744-748
Author(s):  
Xiao Xia Ou ◽  
Feng Jie Zhang ◽  
Chong Wang ◽  
Yun Na Wu ◽  
Juan Du
Keyword(s):  
Humic Acid ◽  
Oxalic Acid ◽  
Rhodamine B ◽  
Fenton Reaction ◽  
Fenton Reagent ◽  
High Concentration ◽  
Reaction Conditions ◽  
Optimal Reaction ◽  
Fenton System ◽  
Apparent Influence

The effects of reaction conditions including Fe2+, H2O2, oxalic acid, and humic acid dosages were discussed on the Fenton degradation of rhodamine B (RB). The optimal reaction conditions of Fenton reaction were 0.15 mM Fe2+, 5 mM H2O2, and pH 3.0, and the decolorization rate RB (10 mg/L) reached 97.8% after 30min catalytic degradation. The changes of Fe2+concentrations in Fenton system has been focused on in this work. A relatively low concentration of Fe2+was maintained during reaction process when Fe2+and H2O2were added with high concentration, and thus RB was degraded quickly. The results implicated that Fe2+dosage played a very important role in the degradation of RB, and H2O2dosage didn’t have an apparent influence on the degradation of RB in general. The Fenton degradation of RB could be inhibited in the presence of oxalic acid and humic acid, especially at a high concentration of oxalic acid and humic acid.

scholarly journals High frequency ultrasound waves for degradation of amoxicillin in the presence of hydrogen peroxides for industrial pharmaceutical wastewater treatment

2014 ◽  
Vol 16 (5) ◽  
pp. 805-813 ◽  
Keyword(s):  
Hydrogen Peroxide ◽  
Wastewater Treatment ◽  
Pharmaceutical Industry ◽  
High Frequency ◽  
Degradation Rate ◽  
Wastewater Effluent ◽  
High Frequency Ultrasound ◽  
Pharmaceutical Wastewater ◽  
Ultrasound Waves ◽  
Frequency Ultrasound

<div> <p>Amoxicillin degradation with and without high frequency ultrasound waves of 2.4 MHz has been investigated. The concentration of amoxicillin was selected to be similar to that of outlet wastewater effluent concentration in pharmaceutical industry namely 50 and 100 ppm. The application of ultrasound waves together with the addition of hydrogen peroxide H<sub>2</sub>O<sub>2</sub> increased the rate of degradation of antibiotic amoxicillin. The doses of H<sub>2</sub>O<sub>2 </sub>used were 5, 2, 1, and 0.1 ml in a solution of 50 ml of amoxicillin. The study showed that ultrasound waves and H<sub>2</sub>O<sub>2 </sub>had improved amoxicillin degradation. The ultrasound has improved the degradation rate more than two times in comparison to amoxicillin solution without ultrasound waves. This degradation rate has been achieved within 90 minutes.&nbsp;</p> </div> <p>&nbsp;</p>

The denitration pathway of p-nitrophenol in the hydrogen peroxide catalytic oxidation with an FeIII-resin catalyst

2012 ◽  
Vol 65 (5) ◽  
pp. 845-858 ◽  
Author(s):  
Rey-May Liou
Keyword(s):  
Hydrogen Peroxide ◽  
Liquid Phase ◽  
Kinetic Study ◽  
Catalytic Oxidation ◽  
Degradation Rate ◽  
Strong Influence ◽  
Reaction Conditions ◽  
Resin Catalyst ◽  
Factors Influencing ◽  
Oxidant Concentration

The liquid-phase hydrogen peroxide catalytic oxidation of p-nitrophenol was performed with an FeIII-resin catalyst. The conversion and mineralization of p-nitrophenol was effectively achieved at mild reaction conditions with the FeIII-resin catalyst. It was found that the oxidant concentration, pH, and temperature dominated the degradation rate of p-nitrophenol. The denitration pathway of p-nitrophenol was proposed, in which the concentration of H2O2 and temperature showed strong influence on the conversion of nitrite to nitrate. To study the factors influencing the denitration of p-nitrophenol, a comparable kinetic study was attempted to know the possible denitration pathway of p-nitrophenol. The results of this investigation indicated that denitration was the possible step occurring with the decomposition of p-nitrophenol.

Deep Oxidative Desulfurization of Model Fuel with H2O2 Catalyzed by Ce-Mo/SiO2 Catalysts

2011 ◽  
Vol 396-398 ◽  
pp. 858-863
Author(s):  
Ning Wang ◽  
Guang Hui Wang ◽  
Jiang Hua Qiu ◽  
Qi Na Li ◽  
Yu Qin Zhang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Sol Gel ◽  
Oxidative Desulfurization ◽  
High Dispersion ◽  
Structure Parameters ◽  
Reaction Conditions ◽  
Desulfurization Rate ◽  
Model Fuel ◽  
Ft Ir ◽  
Optimal Reaction

The catalysts of HPMo/SiO2 modified with Ce3+ were prepared by the sol-gel method. The catalysts were characterized by FT-IR, XRD, SEM and pore structure parameters and evaluated for the oxidative desulfurization of model fuel using hydrogen peroxide as an oxidant. Results showed that the catalysts kept the Keggin structures and the introduction of CeCl3 promoted the high dispersion of MoO3 over SiO2 and increased the specific surface area of the catalysts. Under the optimal reaction conditions, the desulfurization rate for dibenzothiophene (DBT) and benzothiophene (BT) achieved 98.9% and 43.4%, respectively.

Heterogeneous Fenton System Dynamic Decolorization of Simulated Dye Wastewater

2013 ◽  
Vol 641-642 ◽  
pp. 30-34
Author(s):  
Yan Jie Bi ◽  
Yu Kun Ma ◽  
Sheng Liang Zheng ◽  
Bin Song Wang
Keyword(s):  
Residence Time ◽  
Reaction Temperature ◽  
Ph Value ◽  
System Dynamic ◽  
Dye Wastewater ◽  
Heterogeneous Fenton ◽  
Reaction Conditions ◽  
Simulated Wastewater ◽  
Catalyst Dosage ◽  
Fenton System

Using heterogeneous Fenton system dynamic method, a decolorization test was operated for three kinds of simulated dye wastewater (Reactive Red KE-3B, Reactive Yellow KE-4R and Reactive Blue KN-R). Through the single factor experiments to examine the pH, H2O2 dosage, catalyst dosage, reaction temperature and residence time of simulated dye wastewater effected on the simulated dye wastewater decolorization rate. Determined the best decolorization reaction conditions as pH value of 4, the H2O2 concentration of 800 mg/L, catalyst dosage of 20 g, reaction temperature of 60 °C and reaction residence time of 9 minutes. Under this reaction conditions, in heterogeneous fenton system, degradation rate of the three kinds of simulated wastewater reached 95.01%, 93.86% and 97.74%, respectively.

scholarly journals Green synthesis of cyclohexanone glycerol ketal catalyzed by a solid superacid

2012 ◽  
Vol 23 (1) ◽  
pp. 72-76 ◽  
Author(s):  
Elena-Emilia Oprescu ◽  
Emil Stepan ◽  
Paul Rosca ◽  
Adrian Radu ◽  
Cristina-Emanuela Enăşcuţă
Keyword(s):  
Thermogravimetric Analysis ◽  
Condensation Reaction ◽  
Surface Acidity ◽  
Molar Ratio ◽  
Impact Factors ◽  
Impregnation Method ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Solid Superacid ◽  
Optimal Reaction

Abstract This paper discusses the synthesis of a glycerol ketal compound obtained from condensation reaction of cyclohexanone with glycerol catalyzed by a solid superacid. The solid superacid SO42-/TiO2-La2O3 was prepared using coprecipitation and impregnation method and characterized by X-ray diffraction, thermogravimetric analysis, Fourier transform infrared spectroscopy and elemental analysis. The surface acidity was measured by thermogravimetric analysis of adsorbed n-butylamine. In order to achieve the optimal reaction conditions, five impact factors: molar ratio of glycerol to cyclohexanone, catalyst calcination temperature, reaction time, catalyst amount and molar ratio of Ti/La were investigated in the experiments. Synthesized ketal compounds were analyzed by GC-MS/MS. Under the best conditions, the cyclohexanone glycerol ketal yield could reach up to 97%.

Synthesis of Phosphonates via Michaelis-Arbuzov Reaction

2017 ◽  
Vol 14 (6) ◽  
pp. 883-903 ◽  
Author(s):  
Boppudi Hari Babu ◽  
Gandavaram Syam Prasad ◽  
Chamarthi Naga Raju ◽  
Mandava Venkata Basaveswara Rao
Keyword(s):  
Reaction Times ◽  
Biologically Active ◽  
Fine Tuning ◽  
Arbuzov Reaction ◽  
Reaction Conditions ◽  
Solvent Type ◽  
Potential Applications ◽  
Synthetic Methodologies ◽  
Optimal Reaction ◽  
The Arbuzov Reaction

Background: Michaelis–Arbuzov reaction has played a key role for the synthesis of dialkyl or diaryl phosphonates by reacting various alkyl or aryl halides with trialkyl or triaryl phosphite. This reaction is very versatile in the formation of P-C bond from the reaction of aliphatic halides with phosphinites or phosphites to yield phosphonates, phosphinates, phosphine oxides. The Arbuzov reaction developed some methodologies, possible mechanistic pathways, selectivity, potential applications and biologically active various phosphonates. Objective: The synthesis of phosphonates via Michaelis–Arbuzov reaction with many new and fascinating methodologies were developed and disclosed in the literature, and these are explored in this review. Conclusion: This review has discussed past developments and vast potential applications of Arbuzov reaction in the synthesis of organophosphonates. As presented in this review, various synthetic methodologies were developed to prepare a large variety of phosphonates. Improvements in the reaction conditions of Lewis-acid mediated Arbuzov rearrangement as well as the development of MW-assisted Arbuzov rearrangement were discussed. Finally, to achieve high selectivities and yields, fine-tuning of reaction conditions including solvent type, temperature, and optimal reaction times to be considered.

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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