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3 Physicochemical Problems of Mineral Processing

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Hydrolysis of silica sources: APS and DTSACl in microencapsulation processes

Szczepanowicz K., Para G., Bouzga A. M., Simon Ch., Yang J., Warszynski P.

Physicochemical Problems of Mineral Processing

2012

Vol. 48, iss. 2

403-412

The process of formation of silica shells around emulsion droplets was investigated. The 1H-NMR spectroscopy was applied to follow the silica shell formation around emulsion droplets by hydrolysis and condensation of selected silanes in the emulsion system. (3- aminopropyl) triethoxysilane (APS) and dimethyloctadecyl [3-(trimethoxysilyl) propyl] ammonium chloride (DTSACl) were used as silica sources in microencapsulation process. The NMR analysis revealed strong dependence of the hydrolysis reaction rate on pH. Obtained information allowed selecting the optimal conditions for the formation of the capsules with silica shells. The obtained capsules' suspensions were stable for several weeks.

Removal of natural organic matter from potable water using photo-catalytic membrane reactor

Kumakiri I., Simon Ch., Szczepanowicz K., Wodka D., Nowak P., Szyk-Warszyńska L., Warszyńsk P.

Physicochemical Problems of Mineral Processing

2010

Vol. 45

73-84

The application of photocatalysis combined with membrane filtration for the oxidation of humic acid substances (HA) which is one of the major natural organic matters (NOMs) is discussed in this paper. Theoretical model shows a potential advantage of photo-catalytic filtration under low flux conditions. Cross-flow filtration is applied for HA removal using a TiO2 membrane under UV conditions. An increase of the flux through the membrane was observed by applying UV light.

Photocatalytic degradation of the humic species as a method of their removal from water - comparison of UV and artificial sunlight irradiation

Dziedzic J., Wodka D., Nowak P., Warszyński P., Simon Ch., Kumakiri I.

Physicochemical Problems of Mineral Processing

2010

Vol. 45

15-28

The possibility of application of the process of photocatalytic decomposition of humic substances (humic acid - HA) to their removal from water was investigated. Commercial TiO2 (Evonic-Degussa P-25) and the periodic reactor were used in the experiments. The decomposition under artificial sunlight (ASL) and UV irradiation was tested. It was stated that ASL irradiation is not sufficient to cause significant decomposition of HA whereas TiO2 appeared to be very effective under the UV irradiation. Strong adsorption of HA on the surface of TiO2 was observed.