Removal of malachite green by using an invasive marine alga Caulerpa racemosa var. cylindracea

Bekci Z., SEKİ Y., ÇAVAŞ L.

JOURNAL OF HAZARDOUS MATERIALS, cilt.161, ss.1454-1460, 2009 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 161
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1016/j.jhazmat.2008.04.125
  • Dergi Adı: JOURNAL OF HAZARDOUS MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1454-1460
  • Anahtar Kelimeler: Biosorption, Caulerpa racemosa var. cylindracea, Invasive species, Malachite green, Kinetics, AQUEOUS-SOLUTIONS, ACTIVATED CARBON, ADSORPTION-KINETICS, ANTIOXIDANT STATUS, WASTE-WATER, DYE, EQUILIBRIUM, SORPTION, CHLOROPHYTA, LENTILLIFERA
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

The biosorption of a cationic dye, malachite green oxalate (MG) from aqueous solution onto an invasive marine alga Caulerpa racemosa var. cylindracea (CRC) was investigated at different temperatures (298,308 and 318 K). The dye adsorption onto CRC was confirmed by FTIR analysis. Equilibrium data were analyzed using Freundlich, Langmuir and Dubinin-Radushkevich (DR) equations. All of the isotherm parameters were calculated. The Freundlich model gave a better conformity than Langmuir equation. The mean free energy values (E) from DR isotherm were also estimated. In order to clarify the sorption kinetic, the fit of pseudo-first-order kinetic model, second-order kinetic model and intraparticle diffusion model were investigated. It was obtained that the biosorption process followed the pseudo-second-order rate kinetics. From thermodynamic studies the free energy changes were found to be -7.078, -9.848 and -10.864 kJ mol(-1) for 298, 308 and 318 K, respectively. This implied the spontaneous nature of biosorption and the type of adsorption as physisorption. Activation energy value for MG sorption (E-a) was found to be 37.14 kJ mol(-1). It could be also derived that this result supported physisorption as a type of adsorption. (c) 2008 Elsevier B.V. All rights reserved.