Ni2+ Removal from Aqueous Solutions Using Conditioned Clinoptilolites: Kinetic and Isotherm Studies

Çoruh S., Ergun O. N.

ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY, cilt.28, sa.1, ss.162-172, 2009 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 28 Sayı: 1
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1002/ep.10316
  • Dergi Adı: ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.162-172
  • Anahtar Kelimeler: clinoptilolites, nickel removal, ion-exchange, adsorption, isotherm, HEAVY-METAL REMOVAL, IONS REMOVAL, EXCHANGE, ZEOLITE, COPPER, NICKEL, ZINC, THERMODYNAMICS, ADSORPTION, CADMIUM
  • Ondokuz Mayıs Üniversitesi Adresli: Evet

Özet

The aim of this study is to investigate the effects of conditioning with NaCl and HCl solutions on removal of Ni2+ ions from aqueous solutions using natural clinoptilolite. Batch studies were performed to evaluate the effects of various parameters such as chemically conditioning, adsorbent amount, contact time, initial pH of the solution, mixing temperature, and initial metal ions. The results clearly showed that the conditioning improved both the exchange capacity and the removal efficiency. Langmuir, Freundlich, Temkin, and Dubinin-kaganer-Radush-kevich (DKR) isotherm models were adopted to describe the adsorption isotherms. Adsorption isotherms of Ni2+ ions could be best modeled by Langmuir equation. Three simplified models including pseudo-second-order, intraparticle diffusion and Elovic were used to test the adsorption kinetics. These results indicate a significant potential for the natural and conditioned clinoptilolites as an adsorbent/io-exchange material for heavy metal removal. (C) 2008 American Institute of Chemical Engineers Environ Prog, 28: 162-172, 2009