| .镧/铝改性沸石的磷释放条件及再生能力研究[J].农业环境科学学报,2013,32(7):. |
| 镧/铝改性沸石的磷释放条件及再生能力研究 |
| Phosphorus Release Condition and Regenerability of Lanthanum/Aluminum-modified Zeolite |
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| DOI：10.11654/jaes.2013.07.027 |
| 中文关键词: 镧/铝改性沸石 磷吸附 磷释放 再生能力 |
| 英文关键词: lanthanum/aluminum-modified zeolite phosphorus adsorption phosphorus release regenerability |
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| 摘要点击次数: 1807 |
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| 中文摘要: |
| 通过将磷吸收饱和的镧/铝改性沸石分别放入pH为2.0、3.0、4.0、5.0、6.0、7.0、8.0、9.0、10.0、11.0、12.0、13.0的溶液中，研究了镧/铝改性沸石的最佳磷释放条件，并在最佳磷吸附和最佳磷释放条件下研究了镧/铝改性沸石的再生能力。结果表明，当pH变化在2~13时，镧/铝改性沸石的磷释放量和释放百分比随pH的升高先降低后升高，其中：pH为2和12~13时的磷释放率较高，在76%以上，且pH13时的释放率最大，为98.2%；而pH在3~11时，磷释放率较低，在30%以下，且pH6时的释放率最小，为1.7%。表明强酸或强碱环境有利于镧/铝改性沸石中磷的释放。对镧/铝改性沸石再生能力的研究显示，经过4次再生后，镧/铝改性沸石的磷吸附量和再生能力分别为2.367、2.336、2.312、2.253 mg·g-1和96.7%、95.5%、94.5%、92.1%，虽然吸附剂的磷吸附能力随再生次数的增加呈现逐渐降低的趋势，但经过4次再生后，其对磷的吸附能力仍保持在92%以上，表明镧/铝改性沸石具有较好的稳定性和再生能力。 |
| 英文摘要: |
| Lanthanum/aluminum-modified zeolite is a new material that is used to remove phosphorus from waste water. For lanthanum/aluminum-modified zeolite has the advantages of high phosphorus removal efficiency, low expense, innocuity, environment friendly, its application prospect is extremely broad. However, use lanthanum/aluminum-modified zeolite to remove phosphorus from waste water has a disadvantage of producing a lot of chemical sludge. And the effective approach of reducing the chemical sludge is to release phosphorus from lanthanum/aluminum-modified zeolite saturated with phosphorus and improve its regenerability. In order to know the best phosphorus release condition of lanthanum/aluminum-modified zeolite saturated with phosphorus, the effect of pH on the release of phosphorus from lanthanum/aluminum-modified zeolite saturated with phosphorus was investigated by adjusting the pH from 2.0 to 13.0 using NaOH and HCl solutions. And the regenerability of lanthanum/aluminum-modified zeolite was researched simultaneously under the best phosphorus release and best phosphorus adsorption conditions. And the result showed that the amount and ratio of phosphorus releasing from lanthanum/aluminum-modified zeolite decreased firstly and then increased when pH changed from 2 to 13. When pH was 2, 12 and 13, the phosphorus release ratio was higher than 76%, and the phosphorus release ratio reached the highest point when the pH was 13 and the highest value was 98.2%. When pH ranged from 3 to 11, the phosphorus release ratio was lower than 30%, and the phosphorus release ratio reached the lowest point when the pH was 6 and the lowest value was 1.7%. So it could be concluded that strong acid and alkali environment was in favor of phosphorus releasing from lanthanum/aluminum-modified zeolite. The test of the regenerability of lanthanum/aluminum-modified zeolite showed that the phosphorus adsorption amount and the regenerability of lanthanum/aluminum-modified zeolite were 2.367 mg·g-1, 2.336 mg·g-1, 2.312 mg·g-1, 2.253 mg·g-1 and 96.7%, 95.5%, 94.5%, 92.1% respectively in the four times of regeneration and adsorption tests. The adsorption ability of lanthanum/aluminum-modified zeolite decreased with the increasing of regeneration time, however, the adsorption ability was still more than 92%, which meant that lanthanum/aluminum-modified zeolite had a good stability and regenerability. |
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