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    A novel wool dye synthesised via recycling of side fraction of petrol: metal naphtenates (cyclohexane dicarboxylates)
    (Inst Natl Cercetare-Dezvoltare Textile Pielarie-Bucuresti, 2023) Yildiz, Aylin; Oztas, Degirmencioglu Merve
    The study aims to produce naphthenates (cyclohexane dicarboxylate) obtained from side fractions of petrol and used as dyestuff in the textile sector to abate waste-oriented pollution and to reutilize petroleum-based wastes. The investigations showed that obtaining blue dyestuff from copper, red dyestuff from cobalt and yellow dyestuff from nickel was possible. Moreover, it was determined that wool fabric could be dyed with good colour fastness with the dyestuffs mentioned. Therefore, this will help to reduce environmental pollution by addressing a novel and beneficial area of usage for naphthenates, produced via waste recycling.
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    Adsorption of AR114 onto humic acid-modified Fe3O4 nanoparticles
    (Inst Natl Cercetare-Dezvoltare Textile Pielarie-Bucuresti, 2023) Kaykioglu, Guel; Bayramol, Derman vatansever; Yildiz, Aylin
    In this study, Fe3O4 and humic acid-modified Fe3O4 (Fe3O4@HA) magnetic nanoparticles were synthesized and used for the removal of Acid Red 114 (AR114) dyestuff from aqueous. The batch adsorption method was used for the experiments. The magnetic nanoparticles, synthesised by an inexpensive and environmentally friendly precipitation process, were characterised by FTIR, SEM-EDX, BET surface area, and XRD analyses. The optimum pH values determined for Fe3O4 and Fe3O4@HA were the original pH (6.4) and 4, respectively. The equilibrium state was reached after 60 minutes for both adsorbents. The values for Fe3O4 and Fe3O4@HA were determined as 3.4 mg/g and 3.1 mg/g, respectively, when 10 mg/l initial dyestuff concentration and 2 g adsorbent were used. The results obtained in the adsorption experiments performed for both adsorbents were compatible with the Freundlich isotherm and pseudo-second-order kinetic model. Fe3O4 was found to be more efficient than Fe3O4@HA in terms of reuse and Fe3O4 can be used 5 times without any significant loss of adsorption capacity. The results showed that Fe3O4 and Fe3O4@HA can be environmentally friendly alternative adsorbents for the removal of hazardous azo dyestuffs from water, and have regeneration possibilities.
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    Inclusion complexes of ?-cyclodextrıne with Fe3O4@HA@Ag Part II: Their use in the production of PVP nanowebs
    (Inst Natl Cercetare-Dezvoltare Textile Pielarie-Bucuresti, 2023) Atav, Riza; Agirgan, Ahmet Ozgur; Yildiz, Aylin; Bayramol, Derman Vatansever; Erguenay, Ugur
    Humic acid is a material formed as a result of the degradation of animal and plant wastes, it cleans heavy metals which are industrial wastes that threaten both the environment and human health. In part I of this study, the Fe3O4@HA@Ag compound was synthesized, its inclusion complex with beta-cyclodextrin was prepared by using the kneading technique and obtained inclusion complexes were characterized. In this study, part II, nanowebs were formed from the inclusion of complex-containing polymer solution via the electrospinning method. The electrospinning solution consisted of beta-CD:Fe3O4@HA@Ag inclusion complexes at the rate of 5%, 7.5% and 10% by weight and the polyvinylpyrrolidone (PVP) polymer as the carrier. The obtained nanoweb material was characterized by instrumental methods such as SEM, FTIR, XRD, and TGA. The results obtained from FTIR, XRD and TGA revealed that beta-CD:Fe3O4@HA@Ag inclusion complexes containing nanowebs were successfully produced. The uniform fibre formation was detected from SEM images. The average fibre diameter of 5%, 7.5% and 10% beta-CD:Fe3O4@HA@Ag inclusion complex containing nanowebs were measured to be 612.5 nm, 610.8 nm and 431.2 nm, respectively.