论文总字数：15579字

摘 要

作为一种新兴的污染物，四溴双酚A（TBBPA）被认为是一种持久性污染物，其危害受到了广泛的关注。由于其疏水特性，四溴双酚A通常用吸附的方法进行去除。近年来，环糊精及其交联材料由于具备无毒害、可生物降解等特点，普遍用于染织工厂污染物以及工业废水金属离子的去除。本文在前人研究的基础上，通过β-环糊精与乙二胺四乙酸（EDTA）进行交联反应制备改性β-环糊精（EDTA-β-CD）双功能吸附剂。对材料进行电子扫描显微镜（SEM）与傅里叶红外光谱（FT-IR）表征，分析。通过一系列吸附动力学，吸附热力学，吸附等温线，吸附平衡时间，pH等实验考察EDTA-β-CD对水中新兴污染物四溴双酚A污染物的吸附性能。结果表明,在投加量为80mg/L，pH约为7.5时，可以达到对TBBPA最佳吸附，约为14mg/g。吸附在二级动力学方程上拟合效果较好，系数(R²)gt;0.99。吸附等温线契合Freundlich模型。根据热力学实验，EDTA-β-CD吸附是一个放热的进程。EDTA-β-CD制造成本较低，制备工艺简单，预期EDTA-β-CD将会适用于更多的污染物，起到综合有效处理有毒污染物的实际应用。

关键词：四溴双酚A；β-环糊精；EDTA；吸附

Study on Adsorption Characteristics of Modified CD to EDTA

Abstract

As an emerging pollutant, tetrabromobisphenol A is considered to be a persistent pollutant and its hazard has received widespread attention. Due to its hydrophobic nature, TBBPA is usually removed by adsorption. In recent years, cyclodextrin and its cross-linking materials are widely used in the dyeing and weaving factory pollutants and the removal of metal ions from industrial wastewater due to their non-toxic and biodegradable properties. On the basis of previous studies, a modified β-CD (EDTA-β-CD) bifunctional adsorbent was prepared by cross-linking β-CD with ethylenediaminetetraacetic acid (EDTA). The materials were characterized by electronic scanning microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). Through a series of adsorption kinetics, adsorption thermodynamics, adsorption isotherms, adsorption equilibrium time, pH and other experiments, the adsorption performance of EDTA-β-CD on the emerging pollutants of TBBPA in water was investigated. The results showed that the optimal adsorption of TBBPA was about 14 mg/g when the dosage was 80 mg/L and the pH was about 7.5. The adsorption effect on the second-order kinetic equation is better, and the coefficient (R²) is higher than 0.99. The adsorption isotherm fits the Freundlich model. According to thermodynamic experiments, EDTA-β-CD adsorption is an exothermic process. EDTA-β-CD has low manufacturing cost and simple preparation process. It is expected that EDTA-β-CD will be suitable for more pollutants, and it is a practical application for comprehensive and effective treatment of toxic pollutants.

Key Words: Tetrabromobisphenol A；β-cyclodextrin；EDTA； Adsorption

目 录

摘要 Ⅰ

ABSTRACT Ⅱ

第一章 绪论 1

1.1 前言 1

1.1.1四溴双酚A的特性与危害 1

1.1.2 β-环糊精 1

1.1.3 EDTA改性β-环糊精 3

1.2 EDTA-β-CD吸附实验意义 3

1.3研究思路和技术方法 4

第二章 材料制备和实验方法 5

2.1实验试剂及仪器设备 5

2.1.1 主要化学试剂和药品 5

2.1.2 实验仪器及试验装置 5

2.2 改性实验 6

2.2.1 EDTA-β-CD的合成 6

2.2.2 EDTA-β-CD合成条件优化 6

2.3吸附实验 8

2.3.1 绘制标准曲线 8

2.3.2 最佳投加量 9

2.3.3吸附动力学试验 9

2.3.4吸附等温线 10

2.4 表征与傅里叶红外光谱 11

第三章 实验数据与结论 12

3.1表征和性质 12

3.1.1 EDTA-β-CD表征和性质 12

3.2吸附实验数据及结论 13

3.2.1标准曲线 13

3.2.2最佳投加量 14

3.2.3影响因素pH 15

3.2.4吸附动力学 15

3.2.5吸附等温线 17

3.2.6吸附热力学 19

3.3结论与展望 20

参考文献 21

致谢 23

第一章 绪论

1.1 前言

1.1.1 四溴双酚A的特性与危害

四溴双酚A（TBBPA）是双酚A的衍生物，通常用作添加剂加入塑料制品，是一种常用的溴化阻燃剂。因为其阻燃性能出色，四溴双酚A可用于合成不同树脂。同时可以当做添加型阻燃剂，通常有聚苯乙烯、ABS树脂及SAN树脂[1] 。

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