Alicja Katarzyńska

This study investigates the remediation of natural soil samples from diverse locations, which exhibit varying degrees of copper contamination. To further elucidate the mechanisms of contaminant retention and desorption, similar extraction studies were conducted on representative soils. Finally, the resulting metal-rich leachates were treated using advanced organomodified adsorbents. This step aimed to reduce the volume of contaminated solutions and assess the potential for partial Cu recovery, thereby supporting a circular remediation concept.

This study investigates the remediation of natural soil samples from diverse locations, which exhibit varying degrees of copper contamination. To further elucidate the mechanisms of contaminant retention and desorption, similar extraction studies were conducted on representative soils. Finally, the resulting metal-rich leachates were treated using advanced organomodified adsorbents. This step aimed to minimize the volume of contaminated solutions and facilitate the recovery of valuable components, thereby contributing to a circular remediation process.

This study explores the catalytic performance of V³⁺-modified Mg/Al hydrotalcite-derived materials in the oxidative dehydrogenation (ODH) of n-butane, compared with catalysts derived from pyrovanadate and decavanadate precursors. Different methods for preparing hydrotalcite-like materials were applied to obtain vanadium-containing Mg-Al mixed oxide catalysts for n-butane ODH. The hydrotalcite-like precursors were doped with vanadates (V⁵⁺) via ion exchange or co-precipitation or with V³⁺ cations incorporated into brucite-like layers. During calcination in air or argon flow, different vanadium-containing phases were obtained. Our findings demonstrate that V³⁺-doped hydrotalcites exhibit superior activity and selectivity toward the total C₄H₈ products, with enhanced selectivity for 1,3-butadiene. The highest n-butane conversion was observed for catalysts with an MgO structure and vanadium dispersed in the oxide matrix. A similar conversion level (~44%) was obtained for a spinel-like Mg₂VO₄ catalyst, but only a 15% level was found for the highly crystalline α-Mg₂V₂O₇ catalyst. In contrast, the highest selectivities toward dehydrogenated products were observed for V³⁺-containing and α-Mg₂V₂O₇ catalysts. NH₃- and CO₂-temperature programmed desorption (TPD) analyses showed that high basicity combined with low acidity favors the formation of butene isomers and 1,3-butadiene. This work highlights the strategic potential of tailoring vanadium speciation and hydrotalcite-based catalyst design for low-carbon chemical manufacturing, supporting the transition toward a circular economy.

This study explores the catalytic performance of V3+-modified Mg/Al hydrotalcite-derived materials in the oxidative dehydrogenation (ODH) of n-butane, compared with catalysts derived from pyrovanadate and decavanadate precursors. Different methods for preparing hydrotalcite-like materials were applied to obtain vanadium-containing Mg-Al mixed oxide catalysts for n-butane ODH. The hydrotalcite-like precursors were doped with vanadates (V5+) via ion exchange or co-precipitation, or with V3+ cations incorporated into brucite-like layers. During calcination in air or argon flow, different vanadium-containing phases were obtained. Our findings demonstrate that V3+-doped hydrotalcites exhibit superior activity and selectivity toward total C4H8 products, with enhanced selectivity for 1,3-butadiene. The highest n-butane conversion was observed for catalysts with an MgO structure and vanadium dispersed in the oxide matrix. A similar conversion level (~44%) was obtained for a spinel-like Mg2VO4 catalyst, but only 15% for the highly crystalline α-Mg2V2O7 catalyst. In contrast, the highest selectivities toward dehydrogenated products were observed for V3+-containing and α-Mg2V2O7 catalysts. NH3-TPD and CO2-TPD analyses showed that high basicity combined with low acidity favors the formation of butene isomers and 1,3-butadiene. This work highlights the strategic potential of tailoring vanadium speciation and hydrotalcite-based catalyst design for low-carbon chemical manufacturing, supporting the transition toward a circular economy.