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改性磁铁矿脱除水中阴阳离子型染料废水的对比研究

时间:2019-02-19 20:31来源:毕业论文
采用氧化-沉淀法合成Fe2.5Cr0.5O4,并使用X-射线衍射(XRD),扫描电镜(SEM)对合成产物进行表征。表征结果表明:合成出的铬磁铁矿的晶相为立方晶系尖晶石结构,但结晶度差

摘要本论文采用氧化-沉淀法合成Fe2.5Cr0.5O4,并使用X-射线衍射(XRD),扫描电镜(SEM)对合成产物进行表征。表征结果表明:合成出的铬磁铁矿的晶相为立方晶系尖晶石结构,但结晶度差。33369
本论文首先对比研究了亚甲基蓝和酸性橙II的吸附和降解动力学曲线,并且,对比研究它们的降解机理。研究结果表明:铬掺杂磁铁矿不能吸附酸性橙II染料离子,但是对亚甲基蓝有一定的吸附效果。在降解方面,亚甲基蓝和酸性橙II分别符合不同的机理:酸性橙II的降解过程符合E-R机理,其降解过程可描述为拟一级反应。亚甲基蓝的Fenton降解动力学符合L-H机理,其降解过程可描述为零级反应。铬的掺杂也会提高磁铁矿对亚甲基蓝和酸性橙II的降解效果。
其次,本论文探讨了Fe2.5Cr0.5O4投加量,过氧化氢用量,pH,温度,酸性橙II浓度,溶液中NaCl浓度对脱色率的影响。
    最后,本论文通过测紫外可见光谱对Fe2.5Cr0.5O4脱色酸性橙II的的机理进行进一步研究。
关键词  Fe2.5Cr0.5O4,对比研究,酸性橙II,吸附,降解。
毕业论文设计说明书外文摘要
Title   The contrast study on modified magentite decoloring  aqueous cationic and anionic dyes in dye wastewater.             
Abstract
In the research, oxidation - precipitation is used to composite Fe2.5Cr0.5O4,XRD and SEM is used to characterize synthetic product.The result shows that the samples of synthetic chromium magnetite have spinel structure. But the crystallinity is poor.
First,the contrast research of adsorption and degradation kinetics curve  of methylene blue and acid orange II are made,as well as the mechanism of degradation.The result shows that: chromium substituted magnetite has a poor adsorption effect on AOII,but a good effect on MB. Methylene blue and acid orange II are respectively in accordance with different degradation mechanism.The degradation process of acid orange II accords with E - R mechanism,which can be described as pseudo first order reaction.The degradation process of methylene blue accords with L - H mechanism,which can be described as a zero order reaction.Cr substitution greatly increases the catalytic activity of magnetite on AOII and MB.
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Then, this paper discusses the influence of dosage of Fe2.5Cr0.5O4, dosage of hydrogen peroxide , pH, temperature, concentration of acid orange II and NaCl concentration in the solution have on the decoloring rate.
At last, the study on the mechanism of Fe2.5Cr0.5O4 decoloring acid orange II is made by UV-vis.
Keywords  Fe2.5Cr0.5O4, contrast research, AOII, adsorption, degradation
目   次
1引言 1
2实验部分  7
2.1 铬磁铁矿的制备方法  7
2.2  Fe2.5Cr0.5O4的表征方法 7
  2.3  Fe2.5Cr0.5O4异相Fenton脱色生物难降解染料的实验方法 7
  3  铬磁铁矿的结构表征 10
  3.1  X-射线衍射(XRD) 10
  3.2  扫描电镜(SEM)  10
  4  Fe2.5Cr0.5O4异相Fenton法脱色酸性橙II(AOII)和亚甲基蓝(MB)的对比研究
   11
  4.1  吸附动力学线11
  4.2  降解曲线12
  4.3  酸性橙Ⅱ和亚甲基蓝降解机理对比14
  4.4  紫外可见光谱(UV-vis)16
  4.5  本章结论16
  5  影响Fe2.5Cr0.5O4异相Fenton法脱色酸性橙II(AOII)过程中影响因素的研究
  17
  5.1  Fe2.5Cr0.5O4投加量的影响17
  5.2  过氧化氢用量的影响17
  5.3  不同pH值的影响18
  5.4  不同温度的影响19
  5.5  不同酸性橙II初始浓度的影响19 改性磁铁矿脱除水中阴阳离子型染料废水的对比研究:http://www.lwfree.cn/huaxue/20190219/30402.html
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