四氧化三铁负载碳纳米管的制备及微波催化降解水中有机污染物的研究

发布时间：2018-02-25 21:25

本文关键词： 碳纳米管四氧化三铁微波降解有机污染物　出处：《辽宁大学》2016年硕士论文　论文类型：学位论文

【摘要】：本论文制备了四氧化三铁负载碳纳米管(Fe_3O_4/CNTs),并结合微波技术(MW)对水中甲基对硫磷(MP)、敌草隆(Diuron)、偶氮品红(Azo-fuchsine)等有机污染物进行催化降解研究。第一章中,采用微波水热法制备四氧化三铁负载碳纳米管(Fe_3O_4/CNTs),其中碳纳米管(CNTs)选用40-60 nm,将其结合微波降解污染物,并比较Fe_3O_4/CNTs和CNTs的活性。结果显示,水溶液中有机污染物,如甲基橙(MO)、双酚A(BPA)、甲基对硫磷(MP)、罗丹明B(RhB)和偶氮品红(Azo-fuchsine),在四氧化三铁负载碳纳米管结合微波(Fe_3O_4/CNTs/MW)体系中,能够被快速有效地降解。当微波水热(M-H)压力为1.0 Mpa,反应30 min时,铁离子浓度为004 mol/L的Fe_3O_4/CNTs活性最高。将微波水热合成压力改变到1.5Mpa,微波水热合成时间和铁离子浓度(Fe3+)保持不变,初始浓度为38μmol/L (即10mg/L)的甲基对硫磷(MP)溶液,催化剂投加量为1.2g/L,微波功率450 W,2450 MHz,溶液pH=6.2,MW照射15 min时,MP被完全去除。此外,甲基橙(MO)、双酚A (BPA)、甲基对硫磷(MP)、罗丹明B (RhB)和偶氮品红(Azo-fuchsine)水溶液,在Fe_3O_4/CNTs/MW体系中被降解,降解动力学速率常数K分别为0.925、0.845、0.753、0.993和0.943。因此,在相同合成和降解实验条件下,Fe_3O_4/CNTs的微波催化活性高于单纯CNTs。第二章中,采用微波水热法、水热法和共沉淀法三种方法制备四氧化三铁负载碳纳米管(Fe_3O_4/CNTs),并比较其活性。实验选用的碳纳米管粒径为20-40nm。结果显示水溶液中的有机污染物,如双酚A(BPA)、偶氮品红(Azo-fuchsine)、敌草隆(Diuron)、甲基对硫磷(MP)、甲基橙(MO)和罗丹明B(RhB),在Fe_3O_4/CNTs/MW体系中,能够被快速有效地去除。微波水热法、水热法和共沉淀法三种方法制备Fe_3O_4/CNTs的Fe3+浓度都为002 mol/L,将制备得到的三种Fe_3O_4/CNTs催化剂分别取0.4g/L,分别与25mL, 10mg/L敌草隆(Diuron)反应,时间选取1.0分钟,功率选取450 W,降解率分别为43.91%、47.10%和60.37%。因此,Fe_3O_4/CNTs的微波催化活性顺序如下：共沉淀法水热合成法微波水热法。综上所述,四氧化三铁／碳纳米管和碳纳米管有MW催化活性,四氧化三铁／碳纳米管结合微波可以快速有效地降解废水中有机污染物。微波作用下四氧化三铁/碳纳米管降解活性要比碳纳米管好。三种方法比较得出,共沉淀法合成的Fe_3O_4/CNTs活性最优。此技术具有降解效率高,速度快,成本低,且没有中间产物生成,无二次污染等优点,在有机废水处理中具有很好的应用前景。
[Abstract]:In this paper, Fe3O _ 4 / C _ 3O _ 3 nanotubes supported by Fe _ 2O _ 3 were prepared, and the catalytic degradation of methyl parathion, Diuronan, Azo-fuchsineine and other organic pollutants in water by microwave technique was studied. In chapter 1, the catalytic degradation of methyl parathion (MPN), dimethylpyrolone (Diuron), azo fuchine (Azo-fuchsine) and other organic pollutants were studied. Carbon nanotubes supported on Fe _ 2O _ 3 were prepared by microwave-hydrothermal method, in which carbon nanotubes (CNTs) were selected for microwave degradation, and the activities of Fe_3O_4/CNTs and CNTs were compared. The results showed that organic pollutants in aqueous solution were organic pollutants. Such as methyl orange, bisphenol A, bisphenol A, methyl parathion, rhodamine, rhodamine, azo fuchineine, can be rapidly and effectively degraded in the Fe3O / 4CNTsMWMWW system supported by iron trioxide, when the microwave hydrothermal pressure is 1.0 Mpa. the reaction is 30 min. When the concentration of Fe ~ (2 +) was 004 mol/L, the activity of Fe_3O_4/CNTs was the highest. When the hydrothermal synthesis pressure was changed to 1.5 MPA, the microwave hydrothermal synthesis time and the concentration of Fe ~ (3) remained unchanged, and the initial concentration was 38 渭 mol/L (that is, 10 mg / L) of methyl parathion. The amount of catalyst was 1.2 g / L, microwave power was 450 W / L 2450 MHz, solution pH was 6.2MW irradiation 15 min, the MP was completely removed. In addition, methyl orange monoxide, bisphenol A BPAP, methyl parathion, Rhodamine B Rh B) and azo fuchsin (Azo-fuchsine) aqueous solution were degraded in Fe_3O_4/CNTs/MW system. The kinetic rate constants K of degradation were 0.925 ~ 0.845 ~ 0.753N ~ 0.993 and 0.943 respectively. Therefore, the microwave catalytic activity of Fe3O _ 4 / CNTs was higher than that of CNTs under the same synthetic and degradation conditions. In chapter 2, microwave hydrothermal method was used. Carbon nanotubes supported on Fe _ 2O _ 4 were prepared by hydrothermal method and co-precipitation method, and their activity was compared. The diameter of carbon nanotubes was 20-40 nm. For example, bisphenol A (BPA), azofuchine (Azo-fuchine), Diuronon (Diuron), methyl parathion (MPP), methyl orange (MOO) and Rhodamine (BHb) can be removed quickly and effectively in Fe_3O_4/CNTs/MW system. The Fe3 concentration of Fe_3O_4/CNTs prepared by hydrothermal method and co-precipitation method was 002 mol / L, and the three Fe_3O_4/CNTs catalysts were prepared at 0.4g / L, respectively, and reacted with 25mL, 10mg / L Diuron, respectively, for 1.0 minutes. The degradation rates of 43.91W and 60.37W are 43.91W and 60.37W respectively. Therefore, the order of microwave catalytic activity of Fe3O4 / CNTs is as follows: coprecipitation hydrothermal synthesis microwave hydrothermal method. In summary, Fe3O4 / CNTs and carbon nanotubes have MW catalytic activity. Fe _ 2O _ 3 / carbon nanotubes combined with microwave can rapidly and effectively degrade organic pollutants in wastewater. The degradation activity of Fe _ 2O _ 3 / carbon nanotubes under microwave irradiation is better than that of carbon nanotubes. The Fe_3O_4/CNTs synthesized by coprecipitation method has the advantages of high degradation efficiency, high speed, low cost, no intermediate product formation and no secondary pollution, so it has a good application prospect in organic wastewater treatment.
【学位授予单位】：辽宁大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：O643.36;X703

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