新型除氨氮吸附剂的制备及吸附性能的探究

发布时间：2018-05-29 01:40

  本文选题：凹凸棒石 + 吸附除氨氮　； 参考：《西安工程大学》2015年硕士论文

【摘要】：如今随着人类社会的快速发展,景观水体已成为人们生活的一部分,研究表明:当氮磷比超过16:1时,景观水体就会发生富营养化。本课题主要针对凹凸棒石和沸石孔隙通道中充满结晶水、且含有大量镁硅离子的特点,采用凹凸棒石和沸石一起复合改性,制备出一种高效、廉价的新型除氨氮吸附剂对水体中的铵根进行吸附,从而降低水中氨氮含量,打破水中氮磷比例,使景观水体得到治理。通过单因素实验,确定改性的最佳条件和最佳吸附剂的制备过程,取相同质量的凹凸棒石和氢氧化钠、500℃的马弗炉中焙烧2h,在这种条件下得到碱+焙烧改性凹凸棒石;在Na Cl浓度为0.8mol/L、微波化8min、微波功率为750w的条件下,可以得到微波化+盐改性沸石。考虑到经济合理性,选取相同质量的碱+焙烧改性凹凸棒石与微波化+盐改性沸石一起焙烧2h。通过正交实验确定最佳吸附条件,取2g此复合改性吸附剂投入到体积为100m L浓度为100mg/L氨氮溶液中,在p H值为6,温度为30℃,反应2h的条件下,氨氮的去除率为90.5%,吸附容量为4.53mg/g。为了表征复合改性吸附剂的吸附机理,实验对复合改性吸附剂的吸附平衡规律和动力学模型进行了研究,结果表明:复合改性吸附剂吸附平衡时的等温过程比较符合Freundlich吸附模式,在25°C时,其吸附等温式为066.2145.1e=CQ,拟,合相关系数R2=0.9880,复合改性吸附剂的吸附过程符合伪二级动力学吸附模型,其伪二级动力学拟合的方程为t/Qt=0.00474+0.166t,拟合的相关系数为0.9998。图27幅,表20个,参考文献65篇
[Abstract]:Nowadays, with the rapid development of human society, landscape water has become a part of people's life. Studies show that eutrophication occurs when the ratio of nitrogen and phosphorus exceeds 16:1. Aiming at the characteristic that the pore channel of attapulgite and zeolite is filled with crystalline water and contains a lot of magnesium-silicon ions, a kind of high efficiency has been prepared by compound modification of attapulgite and zeolite. In order to reduce the ammonia nitrogen content in water and break the ratio of nitrogen and phosphorus in water, a new kind of cheap adsorbent for removing ammonia nitrogen can adsorb the ammonium radical in water body, so that the landscape water body can be treated. The optimum conditions of modification and the preparation process of the adsorbent were determined by single factor experiment. Attapulgite and sodium hydroxide were roasted in muffle furnace at 500 鈩，

本文编号：1949001