介孔材料的表面改性以及其对Cu2+吸附性能的研究

摘要：本论文主要研究的是将氨基引入到SBA-15这种介孔材料的表面，再嫁接EDTA，最后可以得到一种新的介孔材料叫做EDTA-SBA-15。主要根据的是介孔材料的结构排列整齐有序，它的空隙均匀又密集，并且比表面积也较大，同时，EDTA当中也有着比较多的活性基团羧基。通过FT-IR、TEM、XRD、XPS、氮气吸附-脱附等温线等方法来判断和确定乙二胺四乙酸嫁接成功。当这种材料在50mL浓度为100mg/L 的Cu2+溶液中，并且保持在热力学温度为298K、溶液酸度是5的条件下吸附20分钟，吸附剂量是50mg，这时它的吸附容量是273.2 mg g-1，吸附效果达到了90%。经过测量，实验所得值和计算值基本上是一致的，符合吸附动力学数据，表明其吸附过程中有化学反应，不单单是物理反应。54254

毕业论文关键词：吸附；介孔材料；SBA-15；EDTA；吸附容量

Abstract：The main consideration of mesoporous materials SBA-15 with highly ordered structure, uniform, large specific surface area, porosity and other characteristics, EDTA contain more active group - COOH. This research selects the mesoporous material SBA-15 as the research object, in order to get the NH2 - SBA-15,we introduced in NH2 on its surface , and then grafted EDTA, then synthesis of mesoporous materials EDTA-SBA-15.characterized by FT-IR, XRD, TEM, nitrogen adsorption and desorption isotherms, XPS , indicates that EDTA has been successfully grafted on the surface of the SBA-15, synthetic materials belong to mesoporous materials, its performance with mesoporous material characteristics. the EDTA-SBA-15 has good adsorption properties in 50mL100mg/L, Cu2+ in aqueous solution, when the temperature is 298K, pH is 5, adsorbent dosage is 50mg, adsorption time is 20min, adsorption effect reached 90%, the maximum adsorption capacity is 273.2 mg g-1. In addition, the EDTA-SBA-15 have a good adsorption effect on real wastewater and high repeated utilization ratio.Using quasi the second level reaction model is capable of fitting the adsorption kinetic data (R2=0.9999), and the equilibrium adsorption capacity of the experimental values (qe, exp) and calculated (qe, cal) are in good agreement, indicating the adsorbent adsorption for metal ions is controlled by chemical reaction. Adsorption using Langmuir model are in good agreement (R2= 0.9792), adsorption process may include both physical adsorption and chemical adsorption.

Key words: adsorption；mesoporous materials；SBA-15；EDTA；adsorption capacity

1 绪论 2

1.1 水体的重要性 2

1.2 水体污染的分类 2

1.3 废水中重金属离子的去除 3

1.4 分子筛的研究概述 5

1.5 介孔材料 5

1.6 SBA-15在环境保护领域的应用 10

2 实验部分 11

2.1 研究准备 11

2.2 结果分析和讨论 12

2.3 EDTA-SBA-15对实际废水的净化处理 16

结论 22

参考文献 23

致谢 26

1 绪论

随着生活水平越来越好，我们对环境的要求也越来越严格。尤其是近来频繁爆发的水污染事件引起了全球民众对水质的普遍关注。因此，本文着重对污水中的重金属离子对水环境的危害和怎样去除的方面进行了研究。

1.1 水体的重要性

地球的表面存在的大部分都是水域，无论是生命体的存活还是社会的发展都离不开水。固然地球上的水资源丰富，然而事实上能为人类所使用的淡水资源则少之又少。尤其在中国这样一个人口大国，人均所分得的水量还不足世界人均水量的25%[1]。介孔材料的表面改性以及其对Cu2+吸附性能的研究:http://www.751com.cn/huaxue/lunwen_58457.html