International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2569

Full Length Research Paper

Removal of C.I. Basic Red 46 (BR 46) from contaminated water by adsorption onto hardened paste of Portland cement: Equilibrium isotherms and thermodynamic parameters study

Naghi Saadatjou1, Mohammad Hossein Rasoulifard2*, Azam Heidari3,5, Seyed Mohammad and Mahdi Doust Mohammadi4,5        
1Department of Chemistry, Faculty of Sciences, Semnan University, P.O. Box: 35195-363,  Semnan, Iran. 2Department of Chemistry, Faculty of Sciences, Zanjan University, P.O. Box: 45195-313, Zanjan, Iran. 3Department of Molecular Medicine, School of Medicine, Zanjan University of Medical Science, Zanjan, Iran. 4Department of Chemistry, Islamic Azad University, Zanjan Branch, Zanjan, Iran. 5Islamic Azad University, Zanjan Branch, Young Researchers Club, Zanjan, Iran.  
Email: [email protected]

  •  Accepted: 28 April 2011
  •  Published: 02 October 2011


The present study was carried out to investigate the potential of hardened paste of Portland cement (HPPC) as a low-cost adsorbent for the removal of Basic Red 46 (BR 46) from contaminated water by using batch adsorption studies. In this work, HPPC has been selected as adsorbent because of the main advantages such as high efficiency, simple separation of sludge, abundant availability and low-cost material. The removal of dye in aqueous medium through the process of adsorption with HPPC under a set of variables (contact time, adsorbent dosage, pH, temperature and adsorbent particles size) has been investigated. Results showed that removal of BR 46 increased over 80% with increasing adsorbent dosage, temperature, contact time, pH and adsorbent particle size decreasing.Also the equilibrium adsorption data were fitted well for Temkin isotherm. The adsorption of BR 46 was endothermic and spontaneous with ∆Hâ—¦ values of +5.452 kJ mol−1 and ∆Sâ—¦ values of 0.035 JK-1 mol-1. The free energy changes ∆Gâ—¦ was evaluated with temperature increasing. From the experimental results, it may be concluded that HPPC was an efficient and economical adsorbent for BR 46 removal.


Key words: Adsorption, Basic Red 46 removal, hardened paste of Portland cement, kinetics, equilibrium isotherm, thermodynamic.


HPPC, Hardened paste of Portland cement; SEM, scanning electron microscopy; COD, chemical oxygen demand.