石墨烯基复合材料对环丙沙星的吸附特性研究(2)

菜单

The water of graphene composite adsorption isotherms were studied, fitting model using the Langmuir and Freundlich equations, by the correlation coefficient (R2) of data fitting shows that Langmuir model than the Freundlich model fitted better R2: 0.97325>0.92704. The maximum adsorption capacity Qm caculated by the Langmuir model was 363.28 mg/g. By the D-R equation,the adsorption average free average Ea values was less than 8 kJ/mol.It shows that graphene composite of ciprofloxacin main adsorption process is physical adsorption.

In a word, graphene composites adsorption process of ciprofloxacin is a by fast to slow the process of physical adsorption, adsorption capacity of ciprofloxacin graphene composite decreases with the adsorbent mass increase, the ionic strength experiments show that ion concentration on the adsorption effect is also affected (performance concentration within a certain range to promote the adsorption), pH on the adsorption effect of is within the scope of certain adsorption effect increased with the pH value, more than the critical value to inhibit the adsorption, the reason may is ion electrostatic interactions.

Key words: Antibiotics, graphene composite, adsorption, isotherm, kinetics, ionic strength, pH value.

1 绪论 1

1.1 抗生素污染物简介 1

1.2 碳纳米材料及其对抗生素吸附应用 1

1.2.1 几种碳基吸附材料特性概述 1

1.2.2 石墨烯及其复合材料吸附性能 7

1.3选题依据与研究方法 8

1.3.1 选题依据 8

1.3.2 研究内容与方法 8

1.3.3 研究路线 8

2 实验部分 9

2.1 实验材料与仪器 9

2.1.1 实验材料 9

2.1.2 实验仪器 10

2.2 吸附实验 11

2.2.1 石墨烯基复合材料的制备 11

2.2.2 环丙沙星吸附等温线实验步骤 11

2.2.3 环丙沙星吸附动力学实验步骤 12

2.2.4 离子强度对环丙沙星吸附影响的实验步骤 12

2.2.5 pH值对环丙沙星吸附影响的试验步骤 12

2.3 实验数据处理方法 13

2.3.1 吸附等温线数据处理方程 13

2.3.2 吸附动力学数据处理方程 14

3 石墨烯基复合材料对环丙沙星的吸附特性研究 15

3.1 引言 15

3.2 吸附动力学实验研究 15

3.3 吸附等温线 18

3.4 pH值对吸附的影响 20

3.5 溶液离子强度的影响 21

4 结论与展望 23

参考文献 24

致谢 26

1 绪论

1.1 抗生素污染物简介

抗生素是水中常见的污染物之一，水体中过多的抗生素会对人体产生毒副作用，严重时还会造成二次污染。而残留的抗生素若直接释放到环境中，由此引发的最重要问题是：大大降低抗生素对人类和动物病原体的治疗潜力。现如今，抗生素的危害已经涉及到各个领域，诸如，环境，医疗行业，畜牧业，工业生产等等。研究调查表明，对于抗生素的不合理使用是导致这些问题的关键所在。