Study on preparation of lanthanum-loaded polyethersulfone adsorbent and its performance on phosphorus removal by adsorption
Polymeric membrane material polyethersulfone(PES)with pore size of 3.0 μm was used to prepare lanthanum-loaded PES adsorbent under the optimum conditions of 15％mass percentage NaOH and 1.42 mol/L LaCl3,the lanthanum load mass ratio reached 34.4％and its phosphorus equilibrium adsorption capacity reached as high as 65.1 mg/g.It maintained good phosphorus removal performance in a wide range of pH(3.5-6.5),and its adsorption capacity was not affected by the common competing anions,which showed strong adsorption selectivity.Lanthanum-loaded PES adsorbent had good recycling ability.76.0％of the initial phosphorus adsorption capacity could still be maintained after 5 batches of adsorption-regeneration cycles.The dynamic experiment also showed high removal efficiency of phosphorus and good regeneration,which showed a good prospect of engineering application.
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