Dionisiou,N.S., Matsi,T. and Misopolinos,N.D.(2013): Phosphorus adsorption-desorption on a surfactant-modified natural zeolite: A laboratory study. Water Air Soil Pollut., 224, 1362(10p).

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wAbstract
@Phosphorus adsorption-desorption on a surfactant-modified zeolite (SMZ) was studied with laboratory experiments, in the perspective of using the SMZ for P removal from waters enriched with P. The effects to temperature, pH, and NO3- concentrations on P adsorption on the SMZ were assessed. In addition, P desorption from the SMZ spiked with P at two concentrations (50 and 200 mgkg-1) was investigated. Adsorption data indicated that the SMZ has a high adsorption capacity for P and conformed satisfactorily to the nonlinear forms of Freundlich and Langmuir equations, the latter being slightly superior. Phosphorus adsorption on the SMZ was a fast, exothermic reaction. As the pH of the equilibrium solution increased from the acidic to alkaline range, P adsorption was also increased. In the presence of NO3- in the external solution, P adsorption was reduced only at the highest NO3- concentration studied (50 mgL-1). In both cases of the P-spiked SMZ, P desorption was not affected by P initial concentration and the overall amount of desorbed P reached only the 7.5 mgkg-1. results showed that SMZ can be an effective adsorbent for P and could be used for P removal from waters enriched with P; however, the latter has to be confirmed by large-scale experiments.

Keywords: Surfactant-modified zeolite; Phosphorus adsorption; Phosphorus desorption; Water qualityx

1. Introduction
2. Materials and methods
@2.1. Surface modification of the zeolite
@2.2. Phosphorus adsorption experiments
@2.3. Phosphorus desorption experiments
3. Results and discussion
@3.1. Phosphorus adsorption on the SMZ
@3.2. Phosphorus desorption from the SMZ
4. Conclusions
Acknowledgment
References


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