| 氯化镧改性黏土固化湖泊底泥中磷的研究 |
| 摘要点击 2579 全文点击 1060 投稿时间：2006-03-27 修订日期：2006-08-08 |
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| 中文关键词 湖泊内源污染治理 氯化镧改性黏土 富营养化 磷去除 |
| 英文关键词 treatment of internal phosphorus clay modified by LaCl3 eutrophication P removal |
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| 中文摘要 |
| 用氯化镧对14种黏土进行改性并研究了这些改性黏土固化磷的效果.研究了pH对改性高岭土磷吸附率和镧离子溶出的影响.结果表明，通过氯化镧改性，不同黏土的磷固定率由改性前的3%～14%提高到改性后的52%～95%.氯化镧改性高岭土在pH为5时，达到磷吸附率的最大值94.85%，并在pH值4～8范围内，保持较高的磷吸附率（>80%）.在pH>6.5的范围，La3+溶出浓度低于0.0178 mg/L. |
| 英文摘要 |
| 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?8mg/L. |
