Chitosan Functionalized Alunite as a Green Composite for Sorption and Preconcentration of Copper: From Parametric Optimization to Application

Tunali Akar S., Tunc D., Sayın F., Akar T.

Journal of Polymers and the Environment, cilt.31, sa.4, ss.1359-1372, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 31 Sayı: 4
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1007/s10924-022-02680-2
  • Dergi Adı: Journal of Polymers and the Environment
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Aerospace Database, BIOSIS, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Environment Index, Geobase, Greenfile, Metadex, Pollution Abstracts, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.1359-1372
  • Anahtar Kelimeler: Adsorption, Alunite, Biopolymer, Chitosan, Copper, Composite, ADSORPTION PERFORMANCE, AQUEOUS-SOLUTIONS, REMOVAL, ADSORBENT, EQUILIBRIUM, PHOSPHATE, GASES, MODEL, LEAD, DYES
  • Eskişehir Osmangazi Üniversitesi Adresli: Evet

Özet

© 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.In this study, alunite was immobilized with chitosan to investigate the effective parameters for its adsorption and preconcentration potential for Cu2+ ions. After immobilization, the proposed composite’s adsorption efficiency increased by about 93% and 9%, respectively, when compared to alunite and chitosan components. The pseudo-second-order model better described Cu2+ adsorption. Equilibrium data indicated that Cu2+ adsorption followed the order of Langmuir > D-R > Freundlich with the maximum monolayer adsorption capacities of 42.43, 51.50, and 58.14 mg g−1 at 10, 20, and 30 °C, respectively. Regeneration of the biopolymer composite was achieved with 0.1 M HNO3. IR, SEM/EDX, TG/DTA analysis, and zeta potential measurements were used to characterize the biopolymer composite. An excellent Cu2+ removal performance was observed in a dynamic flow mode, with an adsorption yield of 98.03% at an optimum flow rate of 0.2 mL min−1. The preconcentration of Cu2+ ions by biopolymer composite was explored in the second stage of this work to optimize the type, concentration, and volume of eluent and sample volume. The influence of foreign ions on Cu2+ preconcentration performance was also investigated. At predefined optimum conditions and a 95% confidence level, the recovery yield was 99.97 ± 0.02%, and the RSD was 0.07%. The suggested preconcentration method's LOD and LOQ were 16.81 and 56.00 ng mL−1, respectively. The accuracy and applicability of the method were evaluated using certified standard materials and real water samples, and the produced biopolymer composite was effectively used for Cu2+ preconcentration from real samples.