摘  要：在不断加剧的水体污染中，重金属污染显得格外突出。吸附是水体重金属离子去除的重要手段，而设计并制备新型高效的吸附材料又显得尤为关键。本文以碳化二亚胺盐酸盐（EDC。HCl）为活化剂，N-羟基丁二酰亚胺（NHS）为交联剂的条件下，通过三亚乙基四胺（TETA）与氧化石墨烯（GO）的反应，制备了氨基化石墨烯（TETA@GO），再将TETA@GO与CS2反应最终制备得到了二硫代氨基甲酸盐修饰的GO（CS2@TETA@GO）。然后通过红外光谱、X射线粉末衍射、元素分析及扫描电镜对制备的材料进行表征。最后，将CS2@TETA@GO作为吸附剂来去除水中的Pb2+离子。结果说明此吸附过程可以用准二级动力学方程和颗粒内扩散动力学方程描述；与Freundlich等温方程相比，吸附过程更加符合Langmuir等温方程，由拟合所得到的对Pb2+离子的最大吸附量为238。1 mg/g；吸附热力学分析表明该吸附是一个放热和熵增的过程，一般环境条件下即可自发进行。82164

毕业论文关键词：氧化石墨烯；二硫代氨基甲酸盐；重金属；吸附 

Preparation of Modified Graphene Oxide and its Adsorption Performance for Pb2+ Ions

Abstract: The pollution brought by heavy metals is very typical in the increasing water pollution。 Adsorption is an effective method to remove heavy metals in water。 Then the design and preparation of new effective adsorbents are especially important。 In this paper, amino modified graphene oxide (TETA@GO) was prepared by the reaction of trithylenetetramine (TETA) and graphene oxide (GO), when using carbodiimide hydrochloride (EDC。HCl) as the activator and N-hydroxysuccinimide (NHS) as the crosslinker。 Next, TETA@GO was reacted with CS2 to obtain the final dithiocar-bamate modified GO (CS2@TETA@GO)。 The prepared materials were characterized by infrared spectroscopy, X-ray powder diffraction, elemental analysis and scanning electron microscopy。 Finally, CS2@TETA@GO was used as adsorbent for removing Pb2+ ions in water。 The results showed that the adsorption process can be described by the pesudo-second-order kinetic equation and the particle diffusion kinetic equation。 In addition, compared to Freundlich isotherm equation, the adsorption process fitted better with Langmuir isotherm equation, from which the maximum adsorption capacities calculated was 238。1 mg/g。 Thermodynamic analysis indicated this adsorption was a process of exothermic entropy and can occur in common conditions。

Key Words: Graphene oxide; Dithiocar-bamate; Heavy metals; Adsorption

目    录

摘  要 1

关键词 1

引  言 2

1 实验部分 3

1。1 仪器与试剂 3

1。2 材料合成原理和方法 5

1。3 CS2@TETA@GO吸附Pb2+离子的动力学 7

1。4 CS2@TETA@GO吸附Pb2+离子的等温线 7

1。5 CS2@TETA@GO吸附Pb2+离子的热力学 8

2 结果与讨论 8

2。1 材料的红外表征 8

2。2 材料的X射线粉末衍射表征 9

2。3 材料扫描电镜表征 10

2。4 材料的元素分析表征 11

2。5 吸附动力学 11

2。6 吸附等温性能分析 13

2。7 吸附热力学 15

3 结  论