生物炭负载零价铁修复六六六农药污染土壤研究毕业论文_生态学毕业论文

生物炭负载零价铁修复六六六农药污染土壤研究毕业论文

2021-04-27更新

摘 要

有机氯农药由于其化学性质稳定、很难分解,因此会造成对周围环境的较严重的长期污染。其中最主要的以滴滴涕(DDT)和六六六(HCH)投入使用最早以及应用最为广泛。而六六六急性毒性较小,各异构体毒性比较,以γ—六六六最大。

本论文以生物炭为载体,采用液相还原法制备生物炭负载零价铁,研究其对土壤中六六六的去除性能。系统探讨了不同温度下制备的生物炭负载零价铁、不同质量的生物炭负载零价铁以及不同反应时间对六六六的去除性能的影响。结果表明,700℃下制备的生物炭负载零价铁对γ—六六六的去除率要高于350℃和500℃,但在对α—六六六时,不同制备温度的差别不大;投入量为0.075g的复合材料对γ—六六六的去除率要大于0.03g,但对α—六六六的去除性能只在8—48h投加量越多越好;复合材料对γ—六六六的去除率当反应时间为48h时达到最大值,对α—六六六的去除率当反应时间为8h最佳。 因此当使用质量大,制备温度越高,<100目的生物炭负载零价铁反应时间越长时,其对土壤中γ—六六六的去除性能为最好,去除率可达到99.5%;当投加量为0.075g时,反应时间越长,对α—六六六的去除率越高,投加量为0.03g时,反应时间为8h时,达最佳值。

关键词:生物炭;零价铁;有机污染;土壤修复

A study of Biochar load zero-valent iron for remediation of pollution BHC in soil

ABSTRACT

Organochlorine pesticides because of their chemical stability, difficult to break down, it will cause the surrounding environment of the more serious long-term contamination. The most important to DDT (DDT) and BHC (HCH) was first put to use and most widely used. The BHC acute toxicity less toxic isomers compared to γ- BHC maximum.

In this paper, biochar as a carrier, a liquid phase reduction method biochar load zero valent iron to study the removal performance of BCH in soil. Discussion on the system load biochar zero valent iron, prepared under the influence of different temperatures varying quality biochar load zero valent iron and different reaction time on removal performance of BCH. The results showed that biochar load zero-valent iron at 700℃ preparation of γ- BHC removal rate is higher than 350℃ and 500℃, but when α- BHC little difference between the different preparation temperature; investment amount is 0.075g of composite materials on the γ- BHC removal rate greater than 0.03g, but α- BHC removal performance only 8-48h dosage better; composite of γ- BHC removal when the reaction time was 48h reaches a maximum of α- BHC removal when the reaction time was 8h best. Thus, when using a large mass, the higher the temperature the preparation of lt;100 mesh biochar load ZVI longer reaction time, its γ-BHC soil removal performance is the best removal rate of 99.5%; when dosage is 0.075g, the reaction time is longer, the higher the removal of α- BHC, dosage is 0.03g, the reaction time was 8h, the value of the best.

Key words:Biochar; Zero-valent iron; Organic Pollution; Soil Remediation

目 录

1 前言………………………………………………………………………………………………………1

1.1 有机氯农药的危害…………………………………………………………………………………1

1.1.1 有机氯农药的污染危害……………………………………………………………………1

1.1.2 六六六的危害………………………………………………………………………………2

1.2 生物炭和零价铁在修复有机氯污染土壤的应用前景…………………………………………2

1.2.1 生物炭对土壤中有机污染物的去除………………………………………………………2

1.2.2 零价铁对土壤中有机污染物的降解………………………………………………………3

1.2.3 生物炭负载零价铁的优势………………………………………………………………3

1.2.4 国内外研究进展及现状…………………………………………………………………4

2 实验设计……………………………………………………………………………………6

2.1 生物炭的制备……………………………………………………………………………6

2.2 生物炭负载纳米零价铁的制备…………………………………………………………6

2.3 生物炭负载纳米零价铁对土壤中γ—六六六的去除…………………………………7

2.4 生物炭负载纳米零价铁对土壤中α—六六六的去除…………………………………7

2.5 六六六的测定方法………………………………………………………………………7

3 结果与讨论……………………………………………………………………………………………9

3.1 不同种类的复合材料对土壤中六六六的影响……………………………………………9

3.2 复合材料在不同反应时间下对土壤中六六六的影响……………………………………10

3.3 不同投加量的复合材料对土壤中六六六的影响…………………………………………12

3.4 不足与期望………………………………………………………………………………………13

结论 …………… …………….……………………………………………………………………………14

致谢 ………………………………………………………………………………………………………15

参考文献 …………………………………………………………………………………………………16

1 前言

1.1 有机氯农药的危害

1.1.1 有机氯农药的污染危害

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