Synthesis and characterization of chitosan-vermiculite-lignin ternary composite as an adsorbent for effective removal of uranyl ions from aqueous solution: Experimental and theoretical analyses.

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Şenol Z. M., Kaya S., Şimşek S., Katin K. P., Özer A., Marzouki R.

International journal of biological macromolecules, cilt.209, sa.A, ss.1234-1247, 2022 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 209 Sayı: A
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.ijbiomac.2022.04.128
  • Dergi Adı: International journal of biological macromolecules
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, BIOSIS, Biotechnology Research Abstracts, CAB Abstracts, Chemical Abstracts Core, EMBASE, Food Science & Technology Abstracts, INSPEC, MEDLINE, Veterinary Science Database
  • Sayfa Sayıları: ss.1234-1247
  • Anahtar Kelimeler: Chitosan, Vermiculite, Lignin, Ternary composite, Uranyl, Adsorption, DFT calculations, HEAVY-METAL IONS, ADSORPTION, URANIUM, BIOSORPTION, KINETICS, EFFICIENCY, MECHANISM, GRAPHENE, U(VI), DYES
  • Sivas Cumhuriyet Üniversitesi Adresli: Evet

Özet

Chitosan (Ch), vermiculite (V) and lignin (L) were used as the components of a natural composite adsorbent (Ch-VL) for the removal of the UO22+ ions in aqueous solutions. During the study, we recorded and analyzed the initial UO22+ ion concentration, initial pH, contact time, temperature, and recovery. The recycling performance of the Ch-VL composite was assessed by three sequential adsorption/desorption experiments. Adsorption performance of the Ch-VL composite for UO22+ ions was 600 mg L-1 at pH 4.5 and temperature of 25 ?. Thermodynamic findings, delta H-0:28.1 kJ mol(-1), and delta G(0):- 14.1 kJ mol(-1) showed that adsorption behavior was endothermic and spontaneous. Its maximum adsorption capacity was 0.322 mol kg(-1), obtained from the Langmuir isotherm model. The adsorption kinetics indicated that it followed the pseudo-second-order and intraparticle diffusion rate kinetics. The adsorption thermodynamic shown indicated that the UO22+ ion adsorption was both spontaneous and endothermic. The adsorption process was enlightened by FT-IR and SEM-EDX analyses. The study suggested a simple and cost-effective approach for the removal of toxic UO22+ ions from wastewater. To highlight the adsorption mechanism, DFT calculations were performed. Theoretical results are in good agreement with experimental observations.