改性粉煤灰基Linde type FK沸石对水中磷酸根吸附研究-毕业设计.doc

改性粉煤灰基Linde type F（K）沸石对水中磷酸根吸附研究 Adsorption of Phosphate in Water by Modified Fly Ash Base Linde Type F (K) Zeolite 摘 要 随着工农业生产及城市生活污水中的含磷量升高，江河湖泊水库的污染及富营养化也成为我国甚至全球的重大问题之一。本文以氢氧化钠和HDTMA（十六烷基三甲基溴化铵）为改性剂，对粉煤灰进行改性，以SEM表征粉煤灰改性前后的微观形貌。研究含磷废水的pH值、改性粉煤灰沸石吸附剂的投加量和系统温度对改性沸石吸附性能的影响。根据实验数据，拟合等温吸附模型和吸附动力学模型。主要研究结果如下： （1）从SEM图中可以看出，粉煤灰沸石的表面拥有大量的空隙，这有利于改性粉煤灰沸石对水中磷酸根的吸附。 （2）吸附过程中，随着改性粉煤灰沸石的投加量的增大，磷酸根的去除率逐渐增大。该有具体的量化数值 （3）吸附过程中，溶液的pH值对改性粉煤灰沸石吸附率的影响很大。随着溶液pH值的增大，磷酸根的去除率有着明显的增大。那一直到14？？ （4）吸附过程中，温度对磷酸根离子的吸附效果影响较大，随着温度的增高，改性粉煤灰沸石对水中磷酸根的吸附效率变高，吸附率也变高。那1000℃？？ （5）改性粉煤灰沸石对水中磷酸根的吸附过程符合Freundlich吸附等温模型和准二级吸附动力学。 关键词：粉煤灰；改性；沸石；HDTMA；PO43- ；吸附 Abstract With the industrial and agricultural production and urban sewage in the phosphorus content increased, rivers and lakes reservoir pollution and eutrophication has become China and even one of the major global problems. In this paper, fly ash was modified by sodium hydroxide and HDTMA (cetyltrimethylammonium bromide) as modifier. The microstructure of fly ash was modified by SEM. The effects of the pH value of phosphorus - containing wastewater, the dosage of modified fly ash zeolite adsorbent and the effect of system temperature on the adsorption performance of modified fly ash were studied. According to the experimental data, the isothermal adsorption model was fitted. The main findings are as follows: （1） It can be seen from the SEM diagram that the surface of the fly ash zeolite has a large amount of voids, which facilitates the adsorption of phosphate in the modified fly ash zeolite. （2）In the process of adsorption, the removal rate of phosphate increased with the increase of the dosage of modified fly ash zeolite. （3）During the adsorption process, the pH value of the solution has a great influence on the adsorption rate of modified fly ash zeolite. As the pH of the solution increases, the removal rate of phosphate is significantly increased. （4）In the process of adsorption, the adsorption effect of phosphate ions on the phosphate was