Systems containing hydrogen peroxide at high concentration Communication 18. Physicochemical characterization of the solid phases in the system Sri(OH)2-H2O2-H2O

1959 ◽  
Vol 8 (5) ◽  
pp. 751-758
Author(s):  
S. Z. Makarov ◽  
T. I. Arnol'd
Keyword(s):  
Hydrogen Peroxide ◽  
Physicochemical Characterization ◽  
High Concentration ◽  
Solid Phases

Physicochemical Characterization of Oxidatively Degraded Calcium Lignosulfonate via Alkaline Hydrogen Peroxide

2014 ◽  
Vol 887-888 ◽  
pp. 575-580 ◽  
Author(s):  
Li Hong Hu ◽  
Jing Zhou ◽  
Cai Ying Bo ◽  
Bing Chuan Liang ◽  
Yong Hong Zhou
Keyword(s):  
Hydrogen Peroxide ◽  
Phenolic Resin ◽  
Physicochemical Characterization ◽  
Oxidative Degradation ◽  
Alkaline Condition ◽  
Alkaline Hydrogen Peroxide ◽  
Phenolic Contents ◽  
H Nmr ◽  
Ft Ir

In order to increase the application prospect of calcium lignosulfonate in phenolic resin, Calcium lignosulfonate was oxidatively degraded by Hydrogen peroxide under alkaline condition. Both lignins were characterized by FT-IR, 1H NMR, UV, GC-MS and GPC. The optimal degradation conditions are: lignosulfonate:water=1:1, wt/wt, pH=10, temperature 60 °C, reaction time 2 h, and H2O2 dosage 6 wt% (based on weight of lignosulfonate). The results show that the degraded resultant is higher in phenolic contents, and lower in methoxyl content. Number molecular weight (Mn) of calcium lignosulfonate sharply decreases to 2294, versus 17774 before oxidative degradation.Guaiacly monoer content increased and kinds of phenolic compounds occurre in oxidative degradation fractions, mainly due to β-O-4 and β-5 cleavage. And reactive activity of the oxidatively degraded compounds is sharply increased.

Copper-doped alumina-pillared montmorillonites as catalysts for oxidation of toluene and xylenes with hydrogen peroxide

Clay Minerals ◽  
1999 ◽  
Vol 34 (1) ◽  
pp. 79-87 ◽  
Author(s):  
K. Bahranowski ◽  
M. Gąsior ◽  
A. Kielski ◽  
J. Podobiński ◽  
E. M. Serwicka ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Liquid Phase ◽  
Aromatic Ring ◽  
Catalytic Properties ◽  
Physicochemical Characterization ◽  
Methyl Groups ◽  
Significant Activity ◽  
Phase Oxidation ◽  
Pillared Montmorillonites

AbstractCatalytic properties of Cu-doped alumina-pillared montmorillonite samples have been tested in the liquid phase oxidation of toluene, o-, m-, and p-xylene with hydrogen peroxide. The results show that the clay samples possess significant activity for both the oxidation of methyl groups and hydroxylation of the aromatic ring. Physicochemical characterization of the catalysts using XRD, BET, ESR and ICP-AES techniques show that they are porous materials with Cu species located in the interlayer, present either as isolated Cu2+ ions anchored at alumina pillars or as patches of amorphous CuO. The dependence of the overall yields on the amount of Cu dopant is discussed and explained in terms of the catalyst structural properties.

Solvent-free selective oxidation of toluene over metal-doped MCM-22

2019 ◽  
Vol 43 (11) ◽  
pp. 4406-4412 ◽  
Author(s):  
Maaz Nawab ◽  
Sunita Barot ◽  
Rajib Bandyopadhyay
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Mechanism ◽  
Catalytic Oxidation ◽  
Selective Oxidation ◽  
Physicochemical Characterization ◽  
Solvent Free ◽  
Reaction Parameters ◽  
Metal Doping ◽  
Metal Doped

The synthesis of MCM-22, subsequent metal doping, and physicochemical characterization of the products are reported. The solvent-free catalytic oxidation of toluene using hydrogen peroxide is explored, and the reaction parameters are optimized. A possible reaction mechanism is also described.

scholarly journals Physicochemical characterization of leachates produced in the Rabat-Salé-Kénitra Region landfill technical center and monitoring of their treatment by aeration and reverse osmosis

2020 ◽  
Vol 150 ◽  
pp. 02013
Author(s):  
Mounaim Halim El Jalil ◽  
Hind Elkrauni ◽  
Mohamed Khamar ◽  
Abdelhakim Bouyahya ◽  
Hecham Elhamri ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Biological Treatment ◽  
Physicochemical Characterization ◽  
Oxygen Demand ◽  
High Electrical Conductivity ◽  
High Concentration ◽  
Pollutant Load ◽  
Average Value ◽  
Mineral Pollution

The aim of this work is to study the physicochemical characterization and monitoring of the treatment of leachate generated by the landfilling of household and similar waste in the landfill of Rabat-Salé-Kénitra Region. The analysis of the results showed a high concentration of easily biodegradable organic matter. The pollutant load is of the order of 3,850 mg/L of the chemical oxygen demand (COD), 1.260 mg/L of the biochemical oxygen demand (BOD5), and shows an average content of nitrates (NO3-=56.6 mg/L). This mineral pollution is caused by a high electrical conductivity, which reaches an average value of 15.9 mS/cm, and a low concentration of heavy metals in the raw leachate such as lead (Pb = 1.591 mg/L), copper (Cu = 1.017 mg/L), and cadmium (Cd = 0.109 mg/L). The biological treatment allows for the successive biodegradation of 40% of the BOD5, and 33% of the COD. Moreover, the reverse osmosis filtration in organic membranes achieves a reduction of 98% for BOD5, 97% for COD, 85% for lead, and 67% for copper. In this study, biological and reverse osmosis treatments represented an effective treatment for the organic and metallic leachate pollutants of this landfill.

CHARACTERIZATION OF A HYDROGEN PEROXIDE-BENZENE COMPLEX USING MATRIX ISOLATION INFRARED SPECTROSCOPY

2019 ◽  
Author(s):  
Jay Amicangelo ◽  
Lia Totleben ◽  
Jacob Oslosky ◽  
Yudhishtara Payagala ◽  
Catherine Kaiser ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Infrared Spectroscopy ◽  
Matrix Isolation
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