Titanium dioxide (TiO2) doped with different amounts of lanthanum (La) were prepared by using sol-gel method. The composite materials obtained can be photocatalyzed to convert and recover organic phosphorus. By mixing a calcined lanthanum-TiO2 composite material with a molar ratio of 0.002 with that at a molar ratio of 0.02 without calcination at a weight ratio of 6:4, a composite material named La@TiO2(6:4) was finally obtained. It had a crystal structure of anatase TiO2 with a particle size of about 13nm, and had a surface withspherical aggregates which were uniformly distributed. The light utilization map range of this material was red-shifted as compared to pure TiO2, which resulted in spectrum utilization range expansionthusphotocatalytic efficiency improvement. The phosphorus recovery was up to 85% when 1g/L La@TiO2(6:4) dosage was employed at a initial organic phosphorus concentration of 20mg/L, and the pH of 9. No obvious effect of NO3-、Cl- and SO42- in solution on phosphorus recovery was observed, but CO32- negatively affected the phosphorus recovery. The La@TiO2(6:4) material can be reused for many times after desorption.The reaserch showed that La@TiO2(6:4) is a promising organic phosphorus recycling composite.
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