Synthesis of hydroxyapatite/clay and hydroxyapatite/pumice composites for tetracycline removal from aqueous solutions


ERŞAN M., GÜLER Ü. A., AÇIKEL Ü., SARIOĞLU CEBECİ M.

PROCESS SAFETY AND ENVIRONMENTAL PROTECTION, cilt.96, ss.22-32, 2015 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 96
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1016/j.psep.2015.04.001
  • Dergi Adı: PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.22-32
  • Anahtar Kelimeler: Tetracyline, Adsorption, Hydroxyapatite, Composite, Clay, Pumice, ADSORPTION, SORPTION, CLAY, EQUILIBRIUM, FLUORIDE, LEAD, OXYTETRACYCLINE, PHARMACEUTICALS, DISSOCIATION, ANTIBIOTICS
  • Sivas Cumhuriyet Üniversitesi Adresli: Evet

Özet

Synthesized hydroxyapatite/clay (HA-C) and hydroxyapatite/pumice (HA-P) composites were used for tetracycline (TC) uptake studies from aqueous solution and their uptake capacities were compared. HA-C and HA-P composites were synthesized by precipitation method and the structures of the synthesized composites were characterized by XRD, SEM and BET analyses. Cation exchange capacities of HA-C and HA-P were found to be 84 meq/100 g and 33 meq/100 g, respectively. The TC adsorption using HA-C and HA-P was studied on batch mode. Various parameters such as contact time, solution pH, initial TC concentration, composite dosage, salinity and temperature were optimized. Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models were applied to the equilibrium data. The maximum adsorption capacity onto HA-C was found to be 76.02 mg/g and about four times larger than the adsorption capacity of the HA-P (17.87 mg/g). The results indicated that the TC uptake onto HA-C and HA-P composites is mainly by a surface complexation and ion-exchange mechanism which depend on the solution pH. The calculated values of thermodynamic parameters indicated that the TC adsorption is favorable, physicochemical in nature. The sorption process follows pseudo-second-order and intraparticle diffusion kinetic models. The TC adsorption mechanism by HA-C and HA-P has been proposed. (C) 2015 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.