Institut für Chemie

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Browsing Institut für Chemie by Sustainable Development Goals "13"

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    COFfee: a coffee waste@anthraquinone COF nanocomposite as a photocatalyst for green hydrogen production
    (2025) Singh, Astha; Jena, Swadhin K.; Siril, Prem F.; Kühnel, Moritz F.; Singh, Astha; Institute of Chemistry, University of Hohenheim, Garbenstr. 30, Stuttgart, Germany; Jena, Swadhin K.; School of Chemical Sciences, Indian Institute of Technology Mandi, Mandi, India; Siril, Prem F.; School of Chemical Sciences, Indian Institute of Technology Mandi, Mandi, India; Kühnel, Moritz F.; Institute of Chemistry, University of Hohenheim, Garbenstr. 30, Stuttgart, Germany
    Sustainability is pivotal for the growth, development, and survival of future generations, necessitating a shift to renewable energy sources and sustainable materials. The development of waste-derived, visible-light-active, nontoxic photocatalysts for water splitting is a promising approach in this direction. We report the one-pot synthesis of a novel waste coffee (WC)-based covalent organic framework (COF) nanocomposite, WC@DqTp, via a vortex-assisted solvothermal method. Integrating an anthraquinone-based COF (DqTp) with WC enhances its photocatalytic performance through improved charge separation. The photocatalytic activity of WC@DqTp for hydrogen evolution from water using platinum as a co-catalyst without an added sacrificial agent (36.1 μmol g –1 h –1 ) was almost two times higher than that of bare COF DqTp (21.2 μmol g –1 h –1 ). XPS, photoelectrochemistry, and PL lifetime measurements demonstrated that the superior efficiency of the nanocomposite is likely due to the formation of a Z-scheme heterojunction between WC and DqTp. This work highlights the potential of sustainable materials as efficient photocatalysts for green hydrogen generation.
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    Structure elucidation and characterization of novel glycolipid biosurfactant produced by Rouxiella badensis DSM 100043T
    (2025) Harahap, Andre Fahriz Perdana; Conrad, Jürgen; Wolf, Mario; Pfannstiel, Jens; Klaiber, Iris; Grether, Jakob; Hiller, Eric; Vahidinasab, Maliheh; Salminen, Hanna; Treinen, Chantal; Perino, Elvio Henrique Benatto; Hausmann, Rudolf; Serianni, Anthony S.
    Microbial biosurfactants have become increasingly attractive as promising ingredients for environmentally friendly products. The reasons for this are their generally good performance and biodegradability, low toxicity, production from renewable raw materials, and benefits for the environment perceived by consumers. In this study, we investigated the chemical structure and properties of a novel glycolipid from a new biosurfactant-producing strain, Rouxiella badensis DSM 100043 T . Bioreactor cultivation was performed at 30 °C and pH 7.0 for 28 h using 15 g/L glycerol as a carbon source. The glycolipid was successfully purified from the ethyl acetate extract of the supernatant using medium pressure liquid chromatography (MPLC). The structure of the glycolipid was determined by one- and two-dimensional ( 1 H and 13 C) nuclear magnetic resonance (NMR) and confirmed by liquid chromatography electrospray ionization mass spectrometry (LC-ESI/MS). NMR analysis revealed the hydrophilic moiety as a glucose molecule and the hydrophobic moieties as 3-hydroxy-5-dodecenoic acid and 3-hydroxydecanoic acid, which are linked with the glucose by ester bonds at the C2 and C3 positions. Surface tension measurement with tensiometry indicated that the glucose–lipid could reduce the surface tension of water from 72.05 mN/m to 24.59 mN/m at 25 °C with a very low critical micelle concentration (CMC) of 5.69 mg/L. Moreover, the glucose–lipid demonstrated very good stability in maintaining emulsification activity at pH 2–8, a temperature of up to 100 °C, and a NaCl concentration of up to 15%. These results show that R. badensis DSM 100043 T produced a novel glycolipid biosurfactant with excellent surface-active properties, making it promising for further research or industrial applications.