几种氧化锰矿物氧化降解水体中苯酚实验研究

几种氧化锰矿物氧化降解水体中苯酚实验研究

摘要

在酸性条件下进行了酸性水钠锰矿、锰钾矿、碱性水钠锰矿、钙锰矿这几种氧化锰矿物氧化降解水体中苯酚的实验研究,结果表明:①几种供试氧化锰矿物能不同程度地有效氧化降解水体中的苯酚。②是否通氧气处理不影响苯酚降解; ③反应溶液酸度越大,反应进行得越快; ④样品用量浓度越大,越有利于降解反应; ⑤反应温度升高也有利于降解反应的进行。当不调整介质pH 值(5.82),反应温度为25±1℃,振荡速度为210r/min ,反应4h ,以 2.5g/L的矿物用量处理200mL浓度为0.001mol/L的苯酚时，酸性水钠锰矿的降解率达到78%以上；锰钾矿的降解率基本上达到100% ,达到了工业排放标准；碱性水钠锰矿的降解率仅为22%左右；而钙锰矿的降解率还不到5%；可初步推出几种氧化锰矿物对苯酚的降解能力顺序为:锰钾矿>酸性水钠锰矿>碱性水钠锰矿>钙锰矿。从反应产物初步推断,苯酚降解的实质是氧化锰矿物的氧化降解作用,为处理苯酚废水增加了一种有效的方法,并拓宽了氧化锰矿物的开发应用前景。

关键词

水钠锰矿(酸性、碱性)；锰钾矿；钙锰矿；苯酚；氧化降解；有机废水

Study On the Oxidation and Degradation of Phenol in

Water-mass

by Several Manganese Oxide Minerals

Abstract

According to the redox environmental property of several manganese oxide minerals, the phenol degradation in aqueous and acidified suspensions by H-birnessite, cryptomelane, Na-birnessite and todorokite has been studied. The results are as follows : First ,these manganese oxide minerals supplied can oxidize and degrade phenol effectively in some extent. Second ,when pH isn’t set（5.82）, quantity of mineral is 2.5g/L , temperature is 25±1℃, buffeting speed is 210r/min , and time is 4h, the degradation rate of 200mL phenol solution whose concentration is 0.001 mol/L can almost be over 78% by H-birnessite and up to 100 % by cryptomelane; while only about 22% by Na-birnessite and below 5% by todorokite. Second, oxygen don’ t affect the degradation of phenol. Third, the reaction rate increases when pH decreases. Fourth, the reaction is most likely to take place while the quantity of mineral, temperature are comparatively high.The magnitude order of the ability to oxidize and degrade phenol of these manganese oxide minerals is: cryptomelane> H-birnessite > Na-birnessite > todorokite. It has been deduced from the products that degradation of phenol is attributed to the oxidation of manganese oxide minerals. This is an effective method to degrade phenol sewage. This study will extend the application range of manganese oxide minerals.

Key words

birnessite(H+,OH-); cryptomelane; Todorokite; phenol; oxidative degradation; organic wastewater;

目录

摘要 (Ⅰ)

关键词 (Ⅰ)

Abstract (Ⅱ)

Key words (Ⅱ)

绪论 (1)

1. 材料与方法 (1)

1.1 材料与仪器 (1)

1.2 方法 (1)

1.2.1酸性水钠锰矿的合成 (1)

1.2.2碱性水钠锰矿的合成 (1)

1.2.3锰钾矿的合成 (1)

1.2.4钙锰矿的合成 (2)

1.2.5供试氧化锰矿物对苯酚的降解 (2)

2. 结果与讨论 (2)

2.1 供试氧化锰矿无矿物的XRD鉴定 (2)

2.2 供试氧化锰矿物氧化降解苯酚的动力学研究 (3)

2.3 矿物量的影响 (4)

2.4 介质酸度的影响 (4)

2.5 反应温度的影响 (5)

2.6 环境气体的影响 (5)

3. 降解机理初探 (5)

4.结论 (6)

5.展望 (6)

致谢 (7)

参考文献 (7)