Simultaneous Thermal Activation of Persulfate/Fenton System for High-Concentration N,N-Dimethylacetamide Degradation: Parameter Optimization and Degradation Mechanism

2019 ◽  
Vol 36 (1) ◽  
pp. 12-22 ◽  
Author(s):  
Yue Yuan ◽  
Feng Geng ◽  
Bi Shi ◽  
Bo Lai
Keyword(s):  
Parameter Optimization ◽  
Thermal Activation ◽  
Degradation Mechanism ◽  
High Concentration ◽  
Fenton System

Viscoelastic analysis and oil displacement parameter optimization of high-concentration polymer

2012 ◽  
Vol 29 (1) ◽  
pp. 25-30 ◽  
Author(s):  
Jie-wen SUN ◽  
Yun-hong DING ◽  
Yi-qiang LI ◽  
Yong-jun LU ◽  
Hong-lan ZOU ◽  
...  
Keyword(s):  
Parameter Optimization ◽  
High Concentration ◽  
Oil Displacement ◽  
Viscoelastic Analysis ◽  
Displacement Parameter

Mineralization of norfloxacin in a CoFe–LDH/CF cathode-based heterogeneous electro-fenton system: Preparation parameter optimization of the cathode and conversion mechanisms of H2O2 to ·OH

2021 ◽  
Vol 417 ◽  
pp. 129240
Author(s):  
Dehai Yu ◽  
Junguo He ◽  
Ziyao Wang ◽  
Heliang Pang ◽  
Lin Li ◽  
...  
Keyword(s):  
Parameter Optimization ◽  
Fenton System ◽  
Preparation Parameter

Activated sludge treatment by electro-Fenton process: Parameter optimization and degradation mechanism

2015 ◽  
Vol 32 (8) ◽  
pp. 1570-1577 ◽  
Author(s):  
Ali Reza Rahmani ◽  
Davood Nematollahi ◽  
Ghasem Azarian ◽  
Kazem Godini ◽  
Zohreh Berizi
Keyword(s):  
Activated Sludge ◽  
Parameter Optimization ◽  
Degradation Mechanism ◽  
Process Parameter ◽  
Fenton Process ◽  
Sludge Treatment ◽  
Process Parameter Optimization

The oxygen reduction reaction of two electron transfer of nitrogen-doped carbon in the electro-Fenton system

2020 ◽  
Vol 44 (38) ◽  
pp. 16584-16593
Author(s):  
Jiayi Feng ◽  
Yonggang Zhang
Keyword(s):  
Electron Transfer ◽  
Oxygen Reduction Reaction ◽  
Cathode Material ◽  
Degradation Mechanism ◽  
Reduction Reaction ◽  
Nitrogen Doped ◽  
System P ◽  
Nitrogen Doped Carbon ◽  
Fenton System ◽  
Ti Mesh

Degradation mechanism of ORR for the NGO-Ti mesh cathode material in the EF process.

Thermal Activation on Phase Formation of Alkaline Activated Kaolin Based System

2013 ◽  
Vol 770 ◽  
pp. 262-266 ◽  
Author(s):  
Somsak Boonjaeng ◽  
Kedsarin Pimraksa ◽  
Arnon Chaipanich ◽  
Sutin Kuharuangrong ◽  
Prinya Chindaprasirt
Keyword(s):  
Calcium Silicate ◽  
Calcium Silicate Hydrate ◽  
Thermal Activation ◽  
Pozzolanic Reaction ◽  
Zeolite X ◽  
High Concentration ◽  
Phase Development ◽  
Naoh Solution ◽  
Calcium Aluminosilicate ◽  
Alkali Activated

The research aim was to investigate phase development after pozzolanic reaction between metakaolin (MK) and calcium hydroxide (CH) with alkaline and thermal activations. The CH to MK ratio (C/M) of 0.4 generating CaO/SiO2 of 1.18 was selected in this study. Various concentrations of NaOH solutions (0.01, 0.1, 1, 3, 5 and 10 M) were used. The alkali activated samples were thermally activated at 25 °C, 70 °C, 90 °C and 130 °C for 4 h. Phase development under thermal activation of alkali activated metakaolin based system were investigated. At every temperature, C/M mixtures with 0.01 and 0.1 M NaOH promoted the formations of poorly crystalline calcium silicate hydrate (C-S-H(I)) and calcium aluminosilicate hydrate (CASH) compounds. With 3 and 5 M NaOH activations, sodium aluminosilicate hydrate (NASH) and sodium calcium silicate hydrate (NCSH) was formed. 1 M NaOH was found to be a boundary of phase transformation from C-S-H(I) and CASH to NASH and NCSH. In addition, zeolite X and sodalite appeared when NaOH solution reached 10 M. Thermal activation significantly affected phase development at high concentration of alkaline activation (1-10 M). At 1 M NaOH, NASH compounds in a form of gmelinite and zeolite ZK-14 were found at 70-90 °C. At 3-5 M, katoite was found at 70-130 °C. At 10 M, zeolite X was found at 70-90 °C. Sodalite was also found at 130 °C with 10 M NaOH.

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 Use of an Ultraviolet Light activated Persulfate Process to Degrade Humic Substances: Effects of Wavelength and Persulfate Dose

2021 ◽  
Author(s):  
Yiming Fang ◽  
Hiroshi Sakai
Keyword(s):  
Hydrogen Peroxide ◽  
Molecular Weight ◽  
Drinking Water ◽  
Humic Substances ◽  
Degradation Mechanism ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Lower Molecular Weight ◽  
High Concentration ◽  
Activated Persulfate

Abstract Natural organic matter (NOM), commonly found in surface and ground waters, form Disinfection by-products in drinking water. Generally, advanced oxidation processes (AOPs) featuring hydrogen peroxide are used to treat water, however, sulfate radical recently has been used to treat recalcitrant organics, because it is associated with a higher oxidation potential and more effective removal than hydroxyl radicals. Hence, in this research, we evaluated persulfate oxidation efficiency in terms of reductions in humic substances levels and investigated the degradation mechanism. The results showed that ultraviolet activated persulfate effectively treated humic substances compared with hydrogen peroxide and direct irradiation. Treatment was dose- and wavelength-dependent; higher persulfate concentrations or shorter UV wavelengths were more effective for treating humic substances as high concentration sulfate radicals were created. The degradation mechanism was similar to that of hydrogen peroxide. Aromatic and chromophore components were more susceptible to degradation than were lower molecular weight components, being initially decomposed into the latter, reducing UV254 absorbance and the SUVA254. Lower molecular weight materials were eventually degraded to end products: NPOC levels fell. And we also treated the inflow of a drinking water treatment plant with persulfate, and humic substances were effectively removed.

Electrochemical degradation of levodopa with modified PbO2 electrode: Parameter optimization and degradation mechanism

2014 ◽  
Vol 245 ◽  
pp. 359-366 ◽  
Author(s):  
Qizhou Dai ◽  
Yijing Xia ◽  
Chen Sun ◽  
Mili Weng ◽  
Jun Chen ◽  
...  
Keyword(s):  
Parameter Optimization ◽  
Degradation Mechanism ◽  
Electrochemical Degradation ◽  
Pbo2 Electrode
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