Activated carbon embedded chitosan/polyvinyl alcohol biocomposites for adsorption of nonsteroidal anti-inflammatory drug-naproxen from wastewater

Saloglu D., Ozcan N.

DESALINATION AND WATER TREATMENT, vol.107, pp.72-84, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 107
  • Publication Date: 2018
  • Doi Number: 10.5004/dwt.2018.22107
  • Journal Name: DESALINATION AND WATER TREATMENT
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.72-84
  • Keywords: Activated carbon, Adsorption, Chitosan, Composite, Kinetics, Naproxen, PERSONAL CARE PRODUCTS, BISPHENOL-A, NATIONAL RECONNAISSANCE, AQUEOUS-SOLUTION, SURFACE WATERS, CLOFIBRIC ACID, PHARMACEUTICALS, CONTAMINANTS, CHITOSAN, PPCPS
  • Istanbul Technical University Affiliated: No

Abstract

The feasibility of using activated carbon/chitosan-poly (vinyl alcohol) biocomposites (AC/CHT-PVA) as an adsorbent for removal of naproxen from a factory wastewater in Tuzla, Istanbul/Turkey was studied in the presented study. The biocomposites were synthesized with different AC: CHT-PVA ratios of 1.0; 2.0 and 3.0 (w/w). The adsorbent materials were characterized by FT-IR, SEM and TGA analysis. When AC was embedded into CHT-PVA matrix, the naproxen removal performance increased from 41.01% to 97.03%. The optimal pH for maximum adsorption was found as 7.0. Equilibrium isotherms for the naproxen adsorption onto AC/CHT-PVA biocomposite were measured experimentally. The Langmuir model was fitted to the equilibrium data better than The Freundlich, Temkin and Dubinin-Raduskevich isotherm models. The mono layer adsorption capacity of AC/CHT-PVA: 3.0 for naproxen was found to be 12.24 mg/g at 298 K. According to the kinetics results, the equilibrium time of AC/CHT-PVA biocomposites was found 100 min and it was indicated that the adsorption follows the pseudo second-order kinetic model. The process was favorable and spontaneous. The thermodynamic parameters, Delta G degrees, Delta S degrees and Delta H degrees were calculated and the enthalpy of adsorption (Delta H degrees) was found positive for all biocomposites supported the endothermic nature of adsorption reactions.