Biosorption and retention of orthophosphate onto Ca(OH)2-pretreated biomass of Phragmites sp.


Giorgos Markou , Dimitris Mitrogiannis , Koenraad Muylaert , Abuzer Çelekli , Hüseyin Bozkurt

DOI:10.1016/j.jes.2015.12.009

Received 2015-08-07,Revised 2015-12-01, Accepted 2015-12-02, Available online 2016-01-20

Volume 28,2016,Pages 49-59

The biosorption of phosphorus in the form of orthophosphate (Po) from wastewater using biomass as the sorbent is of potential importance because the Po-loaded biomass could be applied in the agricultural sector as fertilizer and soil conditioner. However, biomass generally displays a very low affinity for Po sorption and therefore biomass surface modification is required. In the present study, the biomass (as model grinded leaves of Phragmites sp. were used) was pretreated with Ca(OH)2 to enhance Po biosorption capacity (qe). The results indicate that the alkaline pretreatment resulted in a modification of surface functional groups. It was concluded that the main sorption mechanisms were ligand exchange and electrostatic attraction. A series of experiments were conducted to investigate the performance of the pretreated biomass for Po uptake under various conditions. Isotherm and thermodynamic studies were also applied and analyzed. The biosorption process was best described by the pseudo-second order kinetic model and Langmuir isotherm, which gave a qmax of 12.27 mg P/g at 25°C and pH 7. The Ca(OH)2 treated Phragmites biomass applied in this study for Po recovery may present some potential advantages in terms of costs and environmental impact.

Copyright © Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved. 京ICP备05002858号-3