Characterization and uranium adsorption properties of ternary composite adsorbent formed by entrapping natural and synthetic X-type zeolite with soluble sulpholignin in polyacrylamide hydrogel: experimental and theoretical approach

Bütün Y., ŞİMŞEK S., OTLU N.

Journal of Radioanalytical and Nuclear Chemistry, cilt.334, sa.7, ss.5051-5067, 2025 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 334 Sayı: 7
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1007/s10967-025-10241-9
  • Dergi Adı: Journal of Radioanalytical and Nuclear Chemistry
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Analytical Abstracts, Biotechnology Research Abstracts, CAB Abstracts, Chemical Abstracts Core, Chimica, Communication Abstracts, Food Science & Technology Abstracts, INSPEC, Metadex, Pollution Abstracts, Public Affairs Index, Veterinary Science Database, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.5051-5067
  • Anahtar Kelimeler: Adsorption, DFT, Lignin, Uranium, Zeolite
  • Sivas Cumhuriyet Üniversitesi Adresli: Evet

Özet

In this study, the adsorption properties of the ternary composite structure formed by entrapment of zeolite-lignin hybrid material in polyacrylamide, an inert polymer, were investigated for the removal of uranium from aqueous solution. The characterization of the composite material was investigated by SEM, BET, XRD, and FTIR analyses. The adsorption results showed that the composite adsorbed maximum at the natural pH of uranium in the range of 4–5. Adsorption capacity was calculated from the Langmuir model and found to be 0.174 mol kg−1 for NZ-L and 0.307 mol kg−1 for ZX-L, respectively. The adsorption kinetics were evaluated with four different models, and it was concluded that the Elovich model was the best-fitting model. It is concluded that the enthalpy of adsorption is positive for both composites, the entropy is increasing, and the free enthalpy value is negative, that is, the process is spontaneous. Computer-based calculations were conducted to analyses the adsorption mechanism and interaction of the composites with uranium, providing a detailed explanation of the process. It has been shown that these two composites of zeolite and lignin, synthesized for the first time, are good adsorbents for both the recovery and removal of uranium.