Role of complexing agents on oxidative degradation of chlorophenolic compounds by pyrite-Fenton process: Batch and column experiments

2019 ◽  
Vol 373 ◽  
pp. 160-167 ◽  
Author(s):  
Cetin Kantar ◽  
Ozlem Oral ◽  
Ozge Urken ◽  
Nilgun Ayman Oz
Keyword(s):  
Oxidative Degradation ◽  
Complexing Agents ◽  
Column Experiments ◽  
Fenton Process

KINETICS CONSIDERATIONS CONCERNING THE OXIDATIVE DEGRADATION BY PHOTO-FENTON PROCESS OF SOME ANTIBIOTICS

2010 ◽  
Vol 9 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Ion Untea ◽  
Cristina Orbeci ◽  
Madelene Dancila ◽  
Daniela Simina Stefan
Keyword(s):  
Oxidative Degradation ◽  
Fenton Process

Role of complexing agents on the etching characteristics of Bi-Sb alloy single crystals

1980 ◽  
Vol 48 (3) ◽  
pp. 483-485
Author(s):  
V.P. Bhatt ◽  
A.R. Vyas ◽  
G.R. Pandya
Keyword(s):  
Single Crystals ◽  
Complexing Agents

The Role of Colloids in Nuclear Waste Disposal

1983 ◽  
Vol 26 ◽  
Author(s):  
A. Avogadro ◽  
G.De Marsily
Keyword(s):  
Ground Water ◽  
Nuclear Waste ◽  
Waste Disposal ◽  
Column Experiments ◽  
Colloidal Transport ◽  
Container Material ◽  
Colloidal Fraction ◽  
Filtration Model

ABSTRACTAspects of formation and characterization of a radioactive colloidal fraction released by the waste form or produced by association with microcolloids naturally existing in ground water or produced either by corrosion of container material or by degradation of backfill material are discussed. A filtration model has been developed in order to describe colloidal transport under field conditions. Comparison between data obtained with laboratory column experiments and theoretical evaluations is presented.

scholarly journals On the mechanism of oxidative degradation of rhodamine B over LaFeO3 catalysts supported on silica materials: Role of support

2016 ◽  
Vol 221 ◽  
pp. 159-166 ◽  
Author(s):  
Hailong Li ◽  
Junjiang Zhu ◽  
Ping Xiao ◽  
Yingying Zhan ◽  
Kangle Lv ◽  
...  
Keyword(s):  
Rhodamine B ◽  
Oxidative Degradation ◽  
Silica Materials

scholarly journals Photo-Fenton Degradation of Pentachlorophenol: Competition between Additives and Photolysis

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1157 ◽  
Author(s):  
Erika Pia Vergura ◽  
Sara Garcia-Ballestreros ◽  
Rosa Francisca Vercher ◽  
Lucas Santos-Juanes ◽  
Alessandra Bianco Prevot ◽  
...  
Keyword(s):  
Crucial Role ◽  
Process Efficiency ◽  
Solar Irradiation ◽  
Fenton Process ◽  
Solar Simulator ◽  
Urban Waste ◽  
Ph Values ◽  
Degradation Rates ◽  
Positive Effect

In the present work, the photo-Fenton degradation of pentachlorophenol (PCP, 1 mg/L) has been studied under simulated and natural solar irradiation; moreover, the effect on the process efficiency of urban waste-derived soluble bio-based substances (SBO), structurally comparable to humic acids, has been investigated. Experiments showed a crucial role of PCP photolysis, present in the solar pilot plant and hindered by the Pyrex® filter present in the solar simulator. Indeed, the SBO screen negatively affects PCP degradation when working under natural solar light, where the photolysis of PCP is relevant. In contrast, in the absence of PCP photolysis, a significant improvement of the photo-Fenton process was observed when added to SBO. Furthermore, SBO were able to extend the application of the photo-Fenton process at circumneutral pH values, due to their ability to complex iron, avoiding its precipitation as oxides or hydroxides. This positive effect has been observed at higher concentration of Fe(II) (4 mg/L), whereas at 1 mg/L, the degradation rates of PCP were comparable in the presence and absence of SBO.

Conditioning of Pretreated LLW Generated by the Decontamination of VVR-S Nuclear Research Reactor Primary Circuit

2013 ◽  
Author(s):  
Mihaela I. Nicu ◽  
Laura A. Ionascu ◽  
Felicia N. Dragolici ◽  
Corneliu N. Turcanu ◽  
Gheorghe Gh. Rotarescu ◽  
...  
Keyword(s):  
Organic Acids ◽  
Research Reactor ◽  
Mechanical Stability ◽  
Setting Time ◽  
Oxidative Degradation ◽  
Nuclear Research ◽  
Cement Matrix ◽  
Primary Circuit ◽  
Complexing Agents ◽  
Chemical Pretreatment

Concentration of complexing acids solutions (oxalic acid, tartaric acid and citric acid) used in radioactive decontamination by chemical method affects both the mechanical stability and the chemical stability of cement matrix. The paper presents the works performed related to the chemical pretreatment of these organic acids solutions using as neutralizing agent Ca(OH)2. In this way it was possible to increase the concentration of organic acids solutions used and the soluble complex radionuclides passing in chemical precipitates, these affecting in a smaller manner the mechanical stability of the cement matrix. The chemical pretreatment the effluents improve the precipitation and conditioning performances by cementation. Were prepared compositions with complexing agents and compositions for oxidative degradation tests to simulate the concentrations of secondary radioactive waste obtained from the primary circuit decontamination of the VVR-S research reactor. It has been studied the influence of chemical pretreatment of complexing acids solutions of different concentrations on the setting time. Also it was determined the compressive strength of mortar samples in which were embedded these solutions of chemically pretreated organic acids. The results shown that an optimum cement–solution ratio doesn’t have a significant impact on the setting time or on the mechanical properties.

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