scholarly journals Removal of Flotation Collector O-Isopropyl-N-ethylthionocarbamate from Wastewater

Molecules ◽  
2021 ◽  
Vol 26 (21) ◽  
pp. 6676
Author(s):  
Zhe Wang ◽  
Jun Yao ◽  
Mojca Bavcon Kralj ◽  
Darko Dolenc ◽  
Polonca Trebše
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Compound ◽  
Photocatalytic Oxidation ◽  
Solar Irradiation ◽  
Sulfide Ores ◽  
Reaction Intermediates ◽  
Oxidation Processes ◽  
Iron Salts ◽  
Artificial Uv ◽  
Flotation Collector

Flotation collector O-isopropyl N-ethylthionocarbamate (IPETC) is widely used for separation of sulfide ores. Its removal from water by several oxidation processes was studied. Photocatalytic oxidation with air in the presence of iron salts, utilizing solar irradiation or artificial UV-A light is very efficient. Oxidation leads through the formation of O-isopropyl N-ethylcarbamate and several other reaction intermediates to total decomposition of organic compound in the final stage in 1 day. Similar results were obtained with a Fenton type oxidation with hydrogen peroxide and iron salts. Treatment with sodium hypochlorite yields mainly O-isopropyl N-ethylcarbamate. The formation of this compound in wastewaters can be of concern, since simple alkyl carbamates are cancer suspect agents.

scholarly journals Magnetic iron oxide/clay nanocomposites for adsorption and catalytic oxidation in water treatment applications

2020 ◽  
Vol 18 (1) ◽  
pp. 1148-1166
Author(s):  
Ganjar Fadillah ◽  
Septian Perwira Yudha ◽  
Suresh Sagadevan ◽  
Is Fatimah ◽  
Oki Muraza
Keyword(s):  
Iron Oxide ◽  
Water Treatment ◽  
Photocatalytic Oxidation ◽  
Low Cost ◽  
Synthesis Method ◽  
Chemical Oxidation ◽  
Magnetic Iron Oxide ◽  
Oxidation Processes ◽  
Recent Developments ◽  
Physical And Chemical

AbstractPhysical and chemical methods have been developed for water and wastewater treatments. Adsorption is an attractive method due to its simplicity and low cost, and it has been widely employed in industrial treatment. In advanced schemes, chemical oxidation and photocatalytic oxidation have been recognized as effective methods for wastewater-containing organic compounds. The use of magnetic iron oxide in these methods has received much attention. Magnetic iron oxide nanocomposite adsorbents have been recognized as favorable materials due to their stability, high adsorption capacities, and recoverability, compared to conventional sorbents. Magnetic iron oxide nanocomposites have also been reported to be effective in photocatalytic and chemical oxidation processes. The current review has presented recent developments in techniques using magnetic iron oxide nanocomposites for water treatment applications. The review highlights the synthesis method and compares modifications for adsorbent, photocatalytic oxidation, and chemical oxidation processes. Future prospects for the use of nanocomposites have been presented.

Formation of peroxo oxalato complex of tungsten(VI) directly from tungsten carbide and hydrogen peroxide - a new path to the total synthesis of the organic compound

1987 ◽  
Vol 133 (2) ◽  
pp. 201-203 ◽  
Author(s):  
Tetsuichi Kudo ◽  
Yoshiyuki Sasaki ◽  
Masato Hashimoto ◽  
Hikaru Ichida ◽  
Kazuko Matsumoto
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Compound ◽  
Total Synthesis ◽  
Tungsten Carbide

Chemical Models of Advanced Oxidation Processes

1992 ◽  
Vol 27 (1) ◽  
pp. 23-42 ◽  
Author(s):  
William H. Glaze ◽  
Fernando Beltran ◽  
Tuula Tuhkanen ◽  
Joon-Wun Kang
Keyword(s):  
Hydrogen Peroxide ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Industrial Wastes ◽  
Organic Substances ◽  
Ultrapure Water ◽  
Radical Scavengers ◽  
Oxidation Processes ◽  
Radical Intermediates ◽  
Chemical Models

Abstract Advanced oxidation processes (AOPs) have been defined as near-ambient temperature processes that involve the generation of highly reactive radical intermediates, especially the hydroxyl radical. These processes show promise for the destruction of hazardous organic substances in municipal and industrial wastes, in drinking water and in ultrapure water. Three types of AOPs are considered in this paper: catalyzed decomposition of ozone; ozone with hydrogen peroxide (Peroxone); and photolysis of hydrogen peroxide with ultraviolet radiation. Kinetic models for these processes are being developed based on known chemical and photochemical principles. The models take into account measured effects of radical scavengers such as bicarbonate; dose ratios of the oxidants or UV intensity; pH; and the presence of generic radical scavengers. The models are used to discuss two cases: oxidation of parts-per-million levels of nitrobenzene with ozone, Peroxone and peroxide/UV and oxidation of naphthalene and pentachlorophenol with peroxide/UV.

Coupling membrane separation and photocatalytic oxidation processes for the degradation of pharmaceutical pollutants

2013 ◽  
Vol 47 (15) ◽  
pp. 5647-5658 ◽  
Author(s):  
F. Martínez ◽  
M.J. López-Muñoz ◽  
J. Aguado ◽  
J.A. Melero ◽  
J. Arsuaga ◽  
...  
Keyword(s):  
Photocatalytic Oxidation ◽  
Membrane Separation ◽  
Oxidation Processes ◽  
Pharmaceutical Pollutants

Photocatalytic Oxidation of Shenfu Bituminous Coal and Xilinhaote Lignite with H2O2 over TiO2

2011 ◽  
Vol 233-235 ◽  
pp. 1684-1689 ◽  
Author(s):  
Heng Shen Xie ◽  
Zhi Min Zong ◽  
Qing Wei ◽  
Pei Zhi Zhao ◽  
Jian Jun Zhao ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Titanium Dioxide ◽  
Catalytic Oxidation ◽  
Photocatalytic Oxidation ◽  
Bituminous Coal ◽  
Straight Chain ◽  
Photo Catalytic Oxidation ◽  
Alkyl Side Chains ◽  
Lignite Coal ◽  
Oxidation Effect

Shenfu bituminous coal (SFBC) and Xilinhaote lignite (XL) were subject to photo-catalytic oxidation with hydrogen peroxide over titanium dioxide. The reaction mixtures were extracted with acetone exhaustively. The extracts were analyzed with FTIR and GC/MS. The results show that coals be oxidized selectively and degraded partially. Compared with the bituminite coal, the oxidation effect of the lignite coal with active hydrogens is more obvious. The alkyl side chains of the macromolecules, particularly, chains of methyl, methylene and aromatic, are the most vulnerable in relation to other compounds in coals. Moreover, the increasing of straight-chain alkanes and the decreasing of condensed nucleus in SFBC and XL through oxidation suggest that the oxidation is an effective method of coal utilization with no difficultly, also be friendly towards the environment after treated as well as in the process of the treatment.

scholarly journals Selective photocatalytic oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxaldehyde by polymeric carbon nitride-hydrogen peroxide adduct

2018 ◽  
Vol 359 ◽  
pp. 212-222 ◽  
Author(s):  
M. Ilkaeva ◽  
I. Krivtsov ◽  
E.I. García-López ◽  
G. Marcì ◽  
O. Khainakova ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Photocatalytic Oxidation ◽  
Carbon Nitride ◽  
Polymeric Carbon

DDT-Contaminated Soil Treatment with Persulfate and Hydrogen Peroxide Utilizing Different Activation Aids and the Chemicals Combination with Biosurfactant

2012 ◽  
Vol 15 (1) ◽  
Author(s):  
Anna Goi ◽  
Marika Viisimaa ◽  
Oleksandr Karpenko
Keyword(s):  
Hydrogen Peroxide ◽  
Contaminated Soil ◽  
Soil Treatment ◽  
Natural Soil ◽  
Persulfate Oxidation ◽  
Oxidation Processes ◽  
Combined Application ◽  
Chemical Oxidants ◽  
Effective Option ◽  
Magnesium Peroxide

AbstractThe efficacy of DDT-contaminated soil treatment with hydrogen peroxide and persulfate utilizing different activation aids and the chemicals combination with biosurfactant was evaluated. The addition of a supplementary activator was able to improve the degradation of total DDT with both the hydrogen peroxide and persulfate oxidation processes indicating a lack of available activator. Ferrous iron added gradually was effectively utilized in the oxidation system with gradual addition of hydrogen peroxide, while chelated metal iron addition promoted the oxidation with more stable persulfate. The treatment with solid carriers of hydrogen peroxide, either calcium peroxide or magnesium peroxide, can be an effective alternative to the liquid one resulting in a higher degradation level of the contaminant. Strong alkalization with elevated dosages of NaOH sustained the persulfate oxidation of DDT. The addition of biosurfactant, rhamnolipid-alginate complex obtained by biosynthesis of strain Pseudomonas sp. PS-17, and EDTA improved the degradation of DDT by both persulfate and hydrogen peroxide oxidation processes indicating that the combined application of chemical oxidants and biosurfactant at natural soil pH has prospects as an effective option for contaminated soil remediation.

Sign in / Sign up

Export Citation Format

Share Document