Potential of microwave-assisted hydrothermal modification for enhanced fly ash adsorption capacity toward to heavy metals: A comprehensive investigation of adsorbent characterization, isotherms, kinetics, and thermodynamics

ÖZSİN G., Varol E. A.

Separation Science and Technology (Philadelphia), cilt.59, sa.1, ss.71-86, 2024 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 59 Sayı: 1
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1080/01496395.2024.2315611
  • Dergi Adı: Separation Science and Technology (Philadelphia)
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Analytical Abstracts, Applied Science & Technology Source, Biotechnology Research Abstracts, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Computer & Applied Sciences, Food Science & Technology Abstracts, INSPEC, Metadex, Pollution Abstracts, DIALNET, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.71-86
  • Anahtar Kelimeler: adsorption, Fly ash, heavy metal, isotherm, kinetics and thermodynamics, microwave modification
  • Bilecik Şeyh Edebali Üniversitesi Adresli: Evet

Özet

Heavy metal contamination is a major concern, and the adsorption process is regarded as one of the most efficient water remediation processes to deal with it. Herein, we modified fly ash by a microwave-assisted hydrothermal process to enhance its adsorption capacity and tested the material toward Cd(II) and Cu(II). Characterization of the adsorbents was performed by several techniques in detail to elucidate considerable structural changes such as cracking of spherical morphology, increase in surface area and changing of the chemical composition. Then batch adsorption was performed under different conditions to investigate the equilibrium, kinetics, and thermodynamics of the process. NaOH-modified fly ash considerably has a higher adsorption performance than that of the as-received sample for both ions. The highest adsorption capacity of modified fly ash was achieved as 133.8 and 95.7 mg/g for Cd(II) and Cu(II), respectively. The kinetics and isotherms could be perfectly reflected by a pseudo-second-order rate equation and the Freundlich model, while thermodynamics confirmed the endothermicity of the process.