정은혜 교수

Lithium is a valuable metal that has been recovered from synthetic shale gas produced water using the titanium-based adsorbent H2TiO3 in this study. The maximum adsorptive capacity of lithium obtained was 2.58 mmol/g after adsorption–desorption tests, and the recovery rate of Li+ was much higher than those of the other cations in the produced water when used with a pH buffer. To enhance the adsorptive capacity and selectivity of lithium, the precipitation process using sodium carbonate was appli

Electrostatic force is investigated as one of the components of the adhesion force between Bacillus thuringiensis (Bt) spores and planar surfaces. The surface potentials of a Bt spore and a mica surface are experimentally obtained using a combined atomic force microscopy (AFM)-scanning surface potential microscopy technique. On the basis of experimental information, the surface charge density of the spores is estimated at 0.03 microC/cm(2) at 20% relative humidity and decreases with increasing h

Shale gas produced water is a hypersaline wastewater that is generated during the shale gas development process called as a hydraulic fracturing. The produced water contains many substances including inorganic salts, organic compounds, and particulates. The treatment process of the produced water is mainly composed of four parts: oil and water separation, removal of suspended solids, removal of organics, and salts removal. This study focuses on the total dissolved salts removal through applying

The lithium adsorbent H2TiO3 was used for lithium adsorption from shale gas-produced water. Produced water contains large concentrations of various organic compounds, but mostly n-alkanes. In this study, the influence of alkanes on lithium adsorption from shale gas-produced water was observed. The precipitation–adsorption–desorption method was used for selective lithium adsorption. Increasing n-hexane concentrations were found to decrease the amount of recovered lithium. To observe the character

Adhesion of spores of Bacillus thuringiensis (Bt) and spherical silica particles on surfaces was experimentally and theoretically investigated in this study. Topography analysis via atomic force microscopy (AFM) and electron microscopy indicates that Bt spores are rod shaped, approximately 1.3 mum in length and approximately 0.8 mum in diameter. The adhesion force of Bt spores and silica particles on gold-coated glass was measured at various relative humidity (RH) levels by AFM. It was expected