Equilibrium, kinetics and thermodynamics of Pb(II) ions from aqueous solution by adsorption onto chitosan-dolomite composite beads

Senol Z. M., ŞİMŞEK S.

INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY, ss.1-15, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1080/03067319.2020.1790546
  • Dergi Adı: INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Agricultural & Environmental Science Database, Aquatic Science & Fisheries Abstracts (ASFA), CAB Abstracts, Chemical Abstracts Core, Chimica, Compendex, Environment Index, Food Science & Technology Abstracts, Pollution Abstracts, Veterinary Science Database
  • Sayfa Sayıları: ss.1-15
  • Anahtar Kelimeler: Chitosan, dolomite, composite, adsorption, Pb2+, SODIUM ALGINATE, HEAVY-METALS, REMOVAL, LEAD, ISOTHERM, WASTE, BIOCOMPOSITES, POLYANILINE, DESORPTION, EFFICIENCY
  • Sivas Cumhuriyet Üniversitesi Adresli: Evet

Özet

This paper aims to investigate the adsorption process of a new composite adsorbent prepared from chitosan (Ch) and dolomite (Do) for removal of lead ions from aqueous solutions. The adsorption process of Pb(2+)ions onto Ch-Do composite adsorbent as initial Pb(2+)concentration, solution pH, temperature, contact time and desorption was investigated. From the results, it has been observed that the highest removal efficiency is approximately 89% at contact time of 6 h, initial Pb(2+)concentration of 500 mg L-1, adsorbent dosage of 100 mg and agitation speed of 150 rpm at pH 4.0. Langmuir isotherm has a better fit with the experimental isotherm data (R-2 = 0.920). The maximum Pb(2+)adsorption capacity from the Langmuir model was found as 0.332 mol kg(-1)at 25 degrees C Also, it performs pseudo-second-order superior performance in kinetic behaviour compared to other used kinetic models (R-2 = 0.904). Thermodynamic parameters showed the Pb(2+)adsorption onto Ch-Do was endothermic, spontaneous and possible. The desorption studies have shown that Ch-Do composite adsorbent has a good adsorption/desorption performance for Pb(2+)ions.