Removal of Orthophosphate from Aqueous Solution Using Natural Zeolite

Onthong, Usa; Karemdabeh, Yakoh
August 2010
Journal of Chemistry & Chemical Engineering;2010, Vol. 4 Issue 8, p42
Academic Journal
This study was focused on orthophosphate adsorption on natural zeolite which was obtained from South of Thailand and has been carried out by Vanadomolybdophosphoric Acid (VMPA) and using spectrophotometry technique. The phosphate solution were prepared artificially by adding certain quantities of KH2PO4 in water at the initial orthophosphate concentration of 5, 10 and 20 mg/L. While the adsorbent quantity was 1 g of natural zeolite per 50 mL, aqueous solution NaOH 1N and HCl 1N solutions were used as pH regulators. The effect of equilibrium pH, adsorbent mass and contact time was studied. The results showed that natural zeolite adsorption efficiency was 99.18%, 99.33% and 99.02% (5, 10 and 20 mg/L), respectively, at pH of 12 and a contact time of 30 minutes at 298 K. Moreover, the isotherm can be used to evaluate the capacity and nature of the interaction between a sorbent and a sorbate. This work considers the Langmuir and Freundlich isotherm. Based on the R2 of adsorption isotherm studies, the adsorption data for phosphate fitted well the Freundlich isotherm for natural zeolite (R2=0.99), with multi-layer adsorption. The results are in good agreement with recent experimentl data.


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