Jabłońska, Beata
[VerfasserIn];
Busch, Mark
[VerfasserIn];
Kityk, Andriy V.
[VerfasserIn];
Huber, Patrick
[VerfasserIn]
;
Technische Universität Hamburg,
Technische Universität Hamburg Institut für Werkstoffphysik und Werkstofftechnologie
Natural and chemically modified post-mining clays
: structural and surface properties and preliminary tests on copper sorption
Anmerkungen:
Sonstige Körperschaft: Technische Universität Hamburg
Sonstige Körperschaft: Technische Universität Hamburg, Institut für Werkstoffphysik und Werkstofftechnologie
Beschreibung:
The structural and surface properties of natural and modified Pliocene clays from lignitemining are investigated in the paper. Chemical modifications are made using hydrofluoric acid(HF), sulfuric acid (H2SO4), hydrochloric acid (HCl), nitric acid (HNO3), sodium hydroxide (NaOH),and hydrogen peroxide (H2O2), at a concentration of 1 mol/dm3. Scanning electron microscopyis used to detect the morphology of the samples. Nitrogen adsorption isotherms were recordedto determine the specific surface area (SSA), mesoporosity, microporosity, and fractal dimensions.The raw clay has an SSA of 66 m2/g. The most promising changes in the structural properties arecaused by modifications with HF or H2SO4(e.g., the SSA increased by about 60%). In addition,the raw and modified clays are used in preliminary tests with Cu(II) sorption, which were performedin batch static method at initial Cu(II) concentrations of 25, 50, 80, 100, 200, 300, and 500 mg/dm3in1% aqueous suspensions of the clayey material. The maximum sorption of Cu(II) on the raw materialwas 15 mg/g. The structural changes after the modifications roughly reflect the capabilities of theadsorbents for Cu(II) adsorption. The modifications with HF and H2SO4bring a similar improvementin Cu(II) adsorption, which is around 20–25% greater than for the raw material. The structuralproperties of investigated clays and their adsorptive capabilities indicate they could be used aslow-cost adsorbents (e.g., for industrial water pretreatment).