摘 要

三氯生和十二烷基苯磺酸钠均被广泛应用于日化产品中，这两种物质都是难降解有机物，随着时间的不断推移，在环境中的浓度不断累积，对生态环境和人体健康的危害也越来越大。鉴于电化学水处理技术操作简便，清洁高效且价格低廉，具有较好的应用前景，故本项目拟采用电化学氧化的方式对含有上述两种化合物共存体系的模拟废污水和单组分十二烷基苯磺酸钠模拟废水进行处理。

研究发现，十二烷基苯磺酸钠在一定浓度内促进三氯生的电解去除，其中40mg/L时促进作用最大，达一定浓度后将会抑制电解过程。三氯生和十二烷基苯磺酸钠双组份水样和十二烷基苯磺酸钠水样电解去除率都随电流密度、电解质浓度的增大而增大，且酸碱性都优于中性条件。双组份水样在电流密度为15mA/cm²、电解质浓度0.025mol/L和pH为7时三氯生最高去除率可达83.6%；十二烷基苯磺酸钠在电流密度为15mA/cm²、电解质浓度0.125mol/L和pH为10时最高去除率可达79.4%。对水样进行紫外光谱扫描和TOC的测定判断：两种物质均先分解使TOC值变大的中间产物，再降解成小分子产物，甚至变成CO₂和水。

关键词：三氯生 十二烷基苯磺酸钠 电化学

Electrochemical treatment of two-component simulated wastewater of triclosan and sodium dodecylbenzene sulfonate

Abstract

Both triclosan and sodium dodecylbenzene sulfonate are widely used in daily chemical products. Both of these substances are refractory organic substances. As time goes by, the concentration in the environment continues to accumulate, and the ecological environment and the harm to human health is also growing. In view of the simple operation, clean and efficient, and low cost, the electrochemical water treatment technology has a good application prospect. Therefore, this project intends to use electrochemical oxidation to simulate waste water containing one-component sodium alkylbenzene sulfonate or the coexistence of the above two compounds.

It was found that sodium dodecyl benzene sulfonate promoted the electrolysis removal of triclosan at a certain concentration, and the maximum effect was promoted at 40 mg/L. When the concentration concentration, the electrolysis process was inhibited. The electrolysis removal rates of the two-component wastewater containing sodium triclosan and sodium dodecylbenzene sulfonate and one-component wastewater containing sodium dodecylbenzene sulfonate increased with the increase of current density and electrolyte concentration, and both acidity and alkalinity were better than neutral conditions. The two-component wastewater sample had a maximum triclosan removal rate of 83.6% when the current density was 15 mA/cm², electrolyte concentration was 0.025 mol/L, and pH was 7. The sodium dodecylbenzene sulfonate maximum removal rate was 79.4% when current density was 15A/cm², electrolyte concentration was 0.125 mol/L and pH was 10. Ultraviolet spectrum scanning and TOC determination indicated that both substances were first decomposed to intermediate products with more TOC value, and then degraded into small molecular products, and even became CO₂ and water.

Key words: triclosan; sodium dodecylbenzene sulfonate; electrochemical

目 录

摘要 …………………………………………………………………………………………Ⅰ

ABSTRACT ………………………………………………………………………………Ⅰ

第一章 绪论 ………………………………………………………………………………1

1.1前言……………………………………………………………………………………1

1.2三氯生和十二烷基苯磺酸钠的常见检测方法………………………………………1

1.2.1三氯生的常见检测方法…………………………………………………………1

1.2.2十二烷基苯磺酸钠的检测………………………………………………………2

1.3三氯生和十二烷基苯磺酸钠的去除 ………………………………………………3

1.3.1三氯生的去除 …………………………………………………………………3

1.3.2十二烷基苯磺酸钠的去除 ……………………………………………………3

1.4电化学氧化法处理双组份体系 ……………………………………………………4

1.4.1电化学氧化法原理 ……………………………………………………………4

1.4.2双组份电解研究 ………………………………………………………………4

1.5本文研究意义和研究内容 …………………………………………………………4

1.5.1研究意义 ………………………………………………………………………4

1.5.2研究内容 ………………………………………………………………………5

第二章 实验内容 …………………………………………………………………………6

2.1主要试剂、仪器 ……………………………………………………………………6

2.1.1试剂 ……………………………………………………………………………6

2.1.2仪器 ……………………………………………………………………………6

2.1.3装置示意图 ……………………………………………………………………7

2.2实验步骤 ……………………………………………………………………………7

2.2.1标准曲线的绘制 ………………………………………………………………7

2.2.2模拟水样的配制………………………………………………………………10

第三章 实验结果与分析 ………………………………………………………………11

3.1实验现象 ……………………………………………………………………………11

3.2实验结果分析………………………………………………………………………11

3.2.1标准曲线………………………………………………………………………11

3.2.2对三氯生降解的影响…………………………………………………………12

3.2.3对SDBS降解的影响 …………………………………………………………15

3.3能耗分析……………………………………………………………………………17

3.4降解效果……………………………………………………………………………20

3.4.1TOC去除效果 …………………………………………………………………20

3.4.2不同时间段的紫外吸收光谱扫描……………………………………………21

第四章 总结与展望 ……………………………………………………………………23

4.1总结…………………………………………………………………………………23

4.2展望…………………………………………………………………………………23

参考文献……………………………………………………………………………………24

致谢 …………………………………………………………………………………………26