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The porous polyvinyl alcohol (PVA)/Al 2 O 3  composite by supporting activated alumina on the cross-linked network of PVA has been successfully prepared and its property for the removal of phosphate in aqueous solution was also evaluated. The structure of the PVA/Al 2 O 3  was examined by scanning electron microscopy. It showed that the activated alumina particles with an average size of 1 μm were evenly dispersed and fixed in the cross-linked network structure of PVA. The effects of adsorption time, solution temperature, pH, initial concentration of phosphate, Al 2 O 3  loading rate, dosage and coexisting ions on the phosphate removal were further studied. The results showed that the highest removal phosphate efficiency of 95% can be obtained with the Al 2 O 3  loading rate of PVA/Al 2 O 3  being 60 wt.% at pH of 4 at 30 °C. The maximum adsorption capacities ofby PVA/Al 2 O 3  suggested by the Langmuir isothermal model was 10.12 mg/g. The adsorption process of phosphate can be fit well with a pseudo-second-order model ( R2  = 0.9900). The PVA/Al 2 O 3  composite exhibited a high selective adsorption of phosphate in the presence of commonly coexisting anions except the obvious effect ofin water. Meanwhile, the PVA/Al 2 O 3  composite can be easily separated and recovered due to the granulation of adsorbent. PVA/Al 2 O 3  composite also shows the excellent properties of regeneration and recycling use with the removal efficiency of phosphate was 88.93%, 88.38% and 94.34% after three cycles, respectively. It can be proposed that the PVA/Al 2 O 3  composite is a promising recyclable adsorbent for removing phosphate at low concentration from aqueous solution.

Removal of phosphate at low concentration from water by porous PVA/Al 2 O 3 composites