Browsing by Author "Petrangeli Papini Marco"

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    A poly(3-hydroxybutyrate)-chitosan polymer conjugate for the synthesis of safer gold nanoparticles and their applications
    (Royal Society of Chemistry, 2018) Silvestri Daniele; Waclawek Stanislaw Witold; Sobel Bartłomiej; Torres Mendieta Rafael Omar; Novotný Vít; Nguyen Nhung Anh Huynh; Ševců Alena; Vellora Thekkae Padil Vinod; Müllerová Jana; Stuchlík Martin; Petrangeli Papini Marco; Černík Miroslav; Varma Rajendra
    A facile and eco-friendly approach is developed for the synthesis of a poly(3-hydroxybutyrate)–chitosan (PHB–chit) polymer conjugate, which is an ideal material for the synthesis of safer gold nanoparticles (nAu). The synthesized products are characterized by various electron-based, optical and spectroscopic techniques including the catalytic activity and the stability/toxicity of nAu. In contrast to the conventional synthesis approaches, the use of PHB–chit results in generation of a highly stable and size-controlled nAu material that exhibits important catalytic activity towards the reduction of 4-nitrophenol (4-NP) to 4-aminophenol, and at the same time shows no toxicity against living bacterial systems such as Escherichia coli or Staphylococcus aureus. The synthesis route reported herein would inspire future developments that circumvent toxicity issues of relevance to living systems while performing common catalytic experimentation.
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    Enhancement of stability and reactivity of nanosized zero-valent iron with polyhydroxybutyrate
    (2017) Waclawek Stanislaw; Chronopoulou Laura; Petrangeli Papini Marco; Vellora Thekkae Padil Vinod; Palocci Cleofe; Kupčík Jaroslav; Černík Miroslav
    Polyhydroxybutyrate (PHB) is a bacterial storage polyester, which is produced directly in the acti-vated sludge process. In the present study, PHB was tested as a scaffold material for stabilization of nanosized zero-valent iron (nZVI). The morphology of the resulting composite was assessed using transmission electron microscopy (TEM) and scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDX) analysis. In addition, the surface chemistry and particle stabilities of nZVI and nZVI/PHB were determined with zeta potential analysis and disc centrifuge measurements, respectively. Moreover, the sedimentation rate of bare nZVI was tested and com-pared with that for nZVI/PHB. Batch experiments further confirmed that nZVI/PHB particles are not only more stable but also more reactive toward perchloroethene (PCE) and Cr(VI) in comparison with the bare nZVI. These results suggest that PHB can be developed as an inexpensive and environ-mentally friendly material for the stabilization of nZVI particles.
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    Stabilization of iron (micro)particles with polyhydroxybutyrate for in situ remediation applications
    (MDPI, 2016) Chronopoulou Laura; Palocci Cleofe; Valentino Francesco; Pettiti Ida; Waclawek Stanislaw Witold; Černík Miroslav; Petrangeli Papini Marco