| Abstract |
| Ca-Sepiolite is a natural mineral with high phosphate adsorption capacity. In this study, the adsorbents for phosphate were prepared by impregnating thermally treated sepiolite in polyvinylidene fluoride (PVDF) and its physical and chemical properties were investigated. The phosphate removal of sepiolite-impregnated PVDF beads with different sepiolite percentage were compared and optimized sepiolite percentage for the beads was found to be 30%. Further experiments were performed using 30% sepiolite impregnated PVDF (30SPL-PVDF). In the kinetic experiments, the adsorption rate of phosphate onto 30SPL-PVDF is governed by chemisorption. The maximum adsorption amount of 30SPL-PVDF was 26.87 mg/g. As the initial pH of the aqueous solution increased, the amount of phosphate adsorption decreased. The influence of anions on the phosphate adsorption followed in decreasing order: SO4 2- > HCO3 - > NO3 -. The amount of phosphate removed per unit mass of 30SPL-PVDF decreased but removal percentage increased with increasing the amount of 30SPL-PVDF dose. In the column test, the breakthrough of phosphate started after about 600 hr of filtration, and the phosphate concentration of the effluent reached the influent concentration after about 1000 hr. It can be concluded that composites of sepiolite and PVDF, i.e., 30SPL-PVDF, can be used as filter media for the removal of phosphorus from aqueous solution. |
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| Key Words |
| Adsorption, Beads, Column experiment, Phosphate, PVDF, Sepiolite |
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