clay and lanthanum-chloride

14 kinds of clay modified by LaCl3 were prepared and their phosphorus(P) fixation was studied. The effect of pH on adsorption rate of P using kaolin modified by LaCl3 and dissolved concentration of La3+ from them were also discussed. The results showed that the fixation rates of P using clay modified by LaCl3 were improved to 52% - 95% from 3% - 14% using unmodified clay. The maximum adsorption rate of P using kaolin modified by LaCl3 was 94.85% on the pH value of 5. Under the condition of pH range from 4 to 8, the P adsorption rate was higher than 80%. When the pH value was higher than 6.5, the dissolved concentration of La3+ from the modified clay was lower than 0.017 8 mg/L.

Topics: Aluminum Silicates; Clay; Fresh Water; Geologic Sediments; Lanthanum; Phosphorus; Soil Pollutants; Water Pollution, Chemical