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2 Physicochemical Problems of Mineral Processing

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Preparation and characterisation of unmodified and poly(ethylene glycol) grafted magnesium hydroxide

Pilarska A., Nowacka M., Pilarski K., Paukszta D., Klapiszewski L., Jesionowski T.

Physicochemical Problems of Mineral Processing

2013

Vol. 49, iss. 2

701--712

The method for the synthesis of either unmodified magnesium hydroxide or functionalised with poly(ethylene glycols) of different molecular weights and physicochemical properties of the products are presented. Magnesium hydroxide was obtained by the precipitation method under well defined conditions from ammonia solution and different magnesium salts. Dispersive properties of the products were characterised by polydispersity index, particle size, as well as SEM images. Crystalline structure of magnesium hydroxide samples were determined by the WAXS method. To confirm the presence of functional groups introduced by appropriate modifiers the samples were subjected to spectroscopic analysis. Electrokinetic stability of the studied samples was determined on the basis of zeta potential dependence vs. pH measurements. The modification has resulted in reduction of particle diameters in some Mg(OH)2 samples.

Synthesis of mg(oh)2 from magnesium salts and nh4oh by direct functionalisation with poly(ethylene glycols)

Pilarska A., Linda I., Wysokowski M., Paukszta D., Jesionowski T.

Physicochemical Problems of Mineral Processing

2012

Vol. 48, iss. 2

631-643

Synthesis of magnesium hydroxide using different magnesium salts and ammonium hydroxide is described. The reaction was performed in the presence of non-ionic compounds representing the group of poly(ethylene glycols) as modifiers. Dispersive properties of the products were characterised by polydispersity index, particle size, as well as SEM and TEM images. Adsorptive properties of the products were evaluated on the basis of their specific surface area, pore volume and diameter determination. Physicochemical characterisation of the products was extended by the degrees of their surface coverage with PEG, calculated on the basis of elemental analysis and specific surface area BET. Crystalline structures of the products were determined by the WAXS method and then using the Scherrer formula the crystallite size was calculated for selected samples. Wettability profiles in aqueous systems were measured and selected samples were subjected to TG/DTA analyses. The properties of the products were found to be significantly dependent on the molecular mass of PEG and type of magnesium salt used.