[Study on phosphorus(P) fixation in the sediment of lake using the clays modified by LaCl3].
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.
Yuan
Xian-Zheng
XZ
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. wayney@126.com
Pan
Gang
G
Tian
Bing-Hui
BH
Chen
Hao
H
D000538:Aluminum Silicates / Q000737:chemistry*; D000077215:Clay; D005618:Fresh Water / Q000032:analysis; D019015:Geologic Sediments / Q000737:chemistry*; D007811:Lanthanum / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*; D014877:Water Pollution, Chemical / Q000517:prevention & control
D000538:Aluminum Silicates; D012989:Soil Pollutants; C028521:lanthanum chloride; D010758:Phosphorus; D007811:Lanthanum; D000077215:Clay