This work focuses on removing hexachlorocyclohexanes (HCHs) found in groundwater polluted with dense non-aqueous phase liquids (DNAPLs) by photo-oxidation hydrogen peroxide or persulfate using LED visible light and ferrioxalate as the catalyst. Single oxidation tests were also performed to evaluate contribution of LED-vis HCHs removal. Results show that it is possible attain degradation up 85% ...

Catechin, a common ingredient of tea and coffee is a colourless water soluble compound which undergoes spontaneous oxidation by aerial O2, heat and also by UV exposure or ammonium persulfate (APS) treatment resulting in a noticeable change to yellow colouration (λmax = 440 nm). Several α-unsaturated fatty acids (ascorbic, maleic, sorbic but not acrylic), βmercapto ethanol (BME) and native bovin...

This paper reports on experimental results of aqueous heterophase polymerizations with monomers of quite different solubility in water ranging from the water-soluble 2-hydroxyethyl methacrylate to lauryl methacrylate with solubility in water of only about 10 mM. A calorimetric study revealed the strong influence of both the hydrophilicity of the monomer and the stirrer speed on the rate of poly...

A new facile cost-effective method for the oxidation of acetyl and carboethoxy derivatives of 3,4dihydropyrimidin-2(1H)-ones (DHPMs) by using potassium peroxydisulfate in water as solvent under microwave irradiation has been developed. Whereas the presence of the acetyl group instead of the carboethoxy group in position 5 decreases the rate of oxidation, the nature of the additional subtituent ...

Cobalt-containing metal oxides [perovskites (LaCoO(3), NdCoO(3), YCoO(3), La(0.7)Sr(0.3)CoO(3)), spinel (Co(3)O(4)) and wolframite (CoWO(4))] have been examined as catalysts for photocatalytic water oxidation with Na(2)S(2)O(8) and [Ru(bpy)(3)](2+) as an electron acceptor and a photosensitizer, respectively. Catalysts with the perovskite structure exhibited higher catalytic activity as compared...

background: tremendous amount of researches have investigated the issue of water photodisnfection. the aim of this research is to illustrate the influences of bacterial density, turbidity, exposure time and potassium persulfate (kps) dosage on the efficacy of associated solar disinfection (sodis) with kps for e. coli (atcc: 25922) eradication as an efficient and inexpensive process. methods: de...

With the increasing demand for novel process analytical technologies in recent years, Raman spectroscopy has been one of the powerful choices for in-situ reaction monitoring. In this paper, we discuss the use of in-situ Raman spectroscopy and the novel multivariate data analysis method, Band-Target Entropy Minimization (BTEM), to monitor the polymerization of methacrylamide using potassium pers...

The catalytic activity of four metal ions the fourth period table by D.I. Mendeleev in oxidation potassium iodide with ammonium persulfate. greatest increase reaction rate is observed presence copper sulfate, least cobalt and nickel salts