scholarly journals Insights into the novel application of Fe-MOFs in ultrasound-assisted heterogeneous Fenton system: Efficiency, kinetics and mechanism

2021 ◽  
Vol 72 ◽  
pp. 105411 ◽  
Author(s):  
Nannan Geng ◽  
Wei Chen ◽  
Hang Xu ◽  
Mingmei Ding ◽  
Tao Lin ◽  
...  
Keyword(s):  
Kinetics And Mechanism ◽  
The Novel ◽  
System Efficiency ◽  
Heterogeneous Fenton ◽  
Ultrasound Assisted ◽  
Fenton System

scholarly journals Renovation and Reuse of Reactive Dyeing Effluent by a Novel Heterogeneous Fenton System Based on Metal Modified PTFE Fibrous Catalyst/H2O2

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Bing Li ◽  
Yongchun Dong ◽  
Zhizhong Ding ◽  
Yiming Xu ◽  
Chi Zou
Keyword(s):  
Reactive Dyes ◽  
Cotton Fabrics ◽  
Molar Ratio ◽  
The Novel ◽  
Heterogeneous Fenton ◽  
Reactive Dyeing ◽  
Toc Removal ◽  
Dyeing Effluent ◽  
Fenton System

Cu-Fe bimetallic grafted polytetrafluoroethylene (PTFE) fiber complexes were prepared and optimized as the novel heterogeneous Fenton catalysts for the degradation of reactive dyes under UV irradiation. Cotton fabrics were dyed with three reactive dyes, namely, Reactive Red 195, Reactive Yellow 145, and Reactive Blue 222, in tap fresh water using exhaustion process. The spent dyeing effluents were then collected and degraded with the optimized Cu-Fe bimetallic grafted PTFE fiber complex/H2O2system. The treated dyeing effluents were characterized and reused for the dyeing of cotton fabrics through the same process. The effect of reuse process number on quality of the dyed cotton fabrics was examined. The results indicated that the Cu-Fe bimetallic modified PTFE fiber complex with a Cu/Fe molar ratio of 2.87 was found to be the most effective fibrous catalyst, which enhanced complete decolorization of the treated dyeing effluents with H2O2in 4 h. However, the TOC removal for the treated dyeing effluents was below 80%. The dyeing quality was not affected for three successive cycles. The increase in residual TOC value influences fourth dyeing cycle. Further TOC reduction of the treated effluents is needed for its repeated reuse in more than three dyeing cycles.

Pollutant degradation behaviors in a heterogeneous Fenton system through Fe/S-doped aerogel

2020 ◽  
Vol 714 ◽  
pp. 136436 ◽  
Author(s):  
Xuechun Wang ◽  
Yuan Zhuang ◽  
Jia Zhang ◽  
Laizhou Song ◽  
Baoyou Shi
Keyword(s):  
Pollutant Degradation ◽  
Heterogeneous Fenton ◽  
Degradation Behaviors ◽  
Fenton System

Modeling of Single Flow Zinc-Nickel Battery for System Efficiency Improvement

2014 ◽  
Vol 716-717 ◽  
pp. 94-97
Author(s):  
Yan Xue Li ◽  
Ming Chui Dong ◽  
Peng Cheng Zhao ◽  
Ying Duo Han
Keyword(s):  
Pump Power ◽  
Flow Rate ◽  
The Novel ◽  
System Efficiency ◽  
Electrolyte Flow ◽  
Battery System ◽  
Operating Modes ◽  
Power Part ◽  
Single Flow ◽  
Zinc Nickel

In operating of a flow battery, a certain flow rate should be maintained in order to guarantee its performance. But the pump consumed power may cause significant losses for the overall battery system. In this paper, a fresh electrical model is proposed for the novel single flow zinc-nickel battery. The model consists of both battery stack part and pump power part, which consequently not only predicts accurately the battery electrical output, but also estimates the pump consumed power at different electrolyte flow rate. Based on the validated model, the influence of pump power on flow battery’s system efficiency can be evaluated at different operating modes. At last, possible means to further improve the system efficiency of battery is discussed.

Immobilisation of Iron-Containing Materials onto Supporting Materials in Heterogeneous Fenton System: A Review

2014 ◽  
Vol 955-959 ◽  
pp. 569-580 ◽  
Author(s):  
Juan Chen
Keyword(s):  
Surface Area ◽  
Heterogeneous Fenton ◽  
Chemical Route ◽  
Advantages And Disadvantages ◽  
System A ◽  
Fenton Catalyst ◽  
Heterogeneous Fenton Catalyst ◽  
Supporting Materials ◽  
Fenton System

The purpose of this review is to aim a summary of the development in the use of different supports for the immobilisation of a heterogeneous Fenton catalyst, which areiron-containing materials. Various anchors and immobilisation methods that are universally employed to the remediation of wastewater are considered. Commonly, the immobilisation of a heterogeneous Fenton catalyst onto supportive material has chiefly been approved through one of two major routes; chemical route physical route or physical route. The advantages and disadvantages of various immobilisation methods to obtain a gigantic surface area iron-containing materials support is considered too.

scholarly journals Pyrolysis of azetidinones. Part 2. Kinetics and mechanism of thermolysis of β-lactams and β-thiolactams

2016 ◽  
Vol 94 (9) ◽  
pp. 788-793 ◽  
Author(s):  
Nouf S. Al-Hamdan ◽  
Alya M. Al-Etaibi ◽  
Rasha F. Al-Bashir ◽  
Yahia A. Ibrahim ◽  
Nouria A. Al-Awadi ◽  
...  
Keyword(s):  
Gas Phase ◽  
Rate Constants ◽  
Kinetics And Mechanism ◽  
Energy Of Activation ◽  
The Novel ◽  
Temperature Range ◽  
Entropy Of Activation ◽  
Kinetics Of ◽  
Thermolysis Reaction

The kinetics of the gas-phase thermolysis reaction of seven β-lactams and their thione analogues were investigated over the temperature range 533–603 K for the β-lactams and 463–542 K for the β-thiolactams. The average values of the energy of activation (Ea) (kJ mol−1) and Arrhenius log A (s–1) were, respectively, 170.8 ± 18.6 and 12.4 ± 1.6 for the lactams and 131.7 ± 18.2 and 11.0 ± 2.0 for the thione analogues. The entropy of activation (ΔS#) was negative for of the substrates and slightly positive for three. The rate constants (k) (s−1) were calculated for 510 K and compared for the two series of azetidinones. The effects of substituents on rates and the novel role played by the C=O and C=S moieties on the relative reactivities of the cyclic amides are rationalized on the basis of a formal retro[2+2]cycloaddition mechanism used earlier to explain the products of the gas-phase thermolysis reaction of the present azetidinones.

Heterogeneous Fenton-like degradation of an azo dye reactive brilliant orange by the combination of activated carbon–FeOOH catalyst and H2O2

2013 ◽  
Vol 67 (3) ◽  
pp. 572-578 ◽  
Author(s):  
Jinhua Wu ◽  
Guanghui Lin ◽  
Ping Li ◽  
Weizhao Yin ◽  
Xiangde Wang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Azo Dye ◽  
Kinetic Studies ◽  
Ferric Ions ◽  
Heterogeneous Fenton ◽  
Pseudo First Order Reaction ◽  
Iron Leaching ◽  
Alkaline Conditions ◽  
Fenton System ◽  
Decoloration Rate

The decoloration of an azo dye reactive brilliant orange (X-GN) by a heterogeneous Fenton system using activated carbon–FeOOH catalyst (AC–FeOOH) and H2O2 was studied. Under typical conditions (pH 7.0, H2O2 10 mmol/L, AC–FeOOH 1.0 g/L and 30 °C), 98% decoloration rate of X-GN was achieved in 240 min. The decoloration efficiency of X-GN increased with higher H2O2 dosage, higher AC–FeOOH dosage and higher reaction temperature. Though the catalytic reaction was an acid driven process, a sufficient decoloration performance was still obtained in neutral and alkaline conditions. Kinetic studies suggested that the decoloration of X-GN followed a pseudo-first order reaction and the activation energy was 17.2 kJ/mol. Iron leaching from AC–FeOOH occurred during the reaction, but the decoloration efficiency of X-GN was still higher than 80% after four runs. The AC–FeOOH has a good stability and can be reused. Besides, the generation of massive iron-containing sludge can be avoided after reaction as the remaining ferric ions in the solution were less than 1 mg/L in this combined H2O2 and AC–FeOOH process.

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