بررسي جذب دارو از منابع آب آلوده‌ به‌وسيله‌ي نانوآميزه‌اي از چارچوب ايميدازولات زئوليت و هالوسيت و ادغام آن با نانوالياف بسپاري

Investigation Of Drug Adsorption From Contaminated Water Sources Using Nanocomposite Zeolitic Imidazolate Framework / Halloysite an‎d Its Integration With Polymeric Nanofibers

نانو فناوري

The provision of safe drinking water has become a global challenge due to population growth, industrial development, an‎d the emergence of new pollutants such as pharmaceuticals. In this study, to improve performance an‎d overcome the limitations of recovery an‎d agglomeration of ZIF-8 in drug adsorption as well as to create a synergistic effect, a nanocomposite of ZIF-8 an‎d halloysite nanotubes (HNTs) was used. Halloysite is a natural mineral material with a nanoscale tubular structure. Its advantages include biocompatibility, low cost, an‎d non-toxicity. Moreover, halloysite, as a nanocarrier, prevents the agglomeration of ZIF-8. Initially, the ZIF-8@HNTs nanocomposite was synthesized using the in-situ growth method an‎d employed for the adsorption of the pharmaceuticals cefixime, ciprofloxacin, an‎d ofloxacin from aqueous solutions. The influencing factors, including temperature, contact time, pH, adsorbent dosage, an‎d solvent concentration, were optimized. Under optimal conditions, the adsorption efficiencies of cefixime, ofloxacin, an‎d ciprofloxacin by the HNTs@ZIF-8 adsorbent were 95%, 93.6%, an‎d 97%, respectively. In the next stage of the study, to improve an‎d facilitate the recovery of the adsorbent, the aforementioned nanocomposite was grown in situ on polyvinyl alcohol nanofibers. Under optimal conditions, the adsorption efficiencies of cefixime, ofloxacin, an‎d ciprofloxacin by this adsorbent reached 85%, 87%, an‎d 88%, respectively. The reusability of both adsorbents was investigated for up to six cycles, an‎d both exhibited good stability. Furthermore, for both synthesized composites, the pseudo-first-order, pseudo-second-order, intraparticle diffusion, an‎d Elovich kinetic models were examined. The thermodynamic parameters an‎d the Langmuir, Freundlich, an‎d Temkin isotherm models were also analyzed. Based on the results, the adsorption processes of the mentioned drugs by both adsorbents were spontaneous an‎d exothermic. All samples used in this research including ZIF-8 powder, halloysite nanotubes, an‎d the synthesized composites were characterized using various techniques such as XRD, FT-IR, UV-vis, BET, TGA, ICP, FESEM, EDX, an‎d tensile testing.

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