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 qualityx
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