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  本文關(guān)鍵詞：羥基自由基與無機(jī)含氧酸鹽反應(yīng)　出處：《大連海事大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 高級(jí)氧化 羥基自由基 含氧酸根 自由基 過氧酸根

【摘要】：利用羥基自由基具有強(qiáng)氧化性可降解水中有機(jī)物,這種方法是近些年新興的高級(jí)氧化技術(shù)之一。羥自由基的標(biāo)準(zhǔn)氧化還原電位極強(qiáng),因此能氧化水中大部分有機(jī)污染物。目前對(duì)在水中與有機(jī)物的反應(yīng)機(jī)理上普遍認(rèn)為是：奪氫作用,電子轉(zhuǎn)移作用和加成作用三個(gè)方面。而對(duì)羥自由基與各種含氧酸的自由基相互轉(zhuǎn)化并不是研究的很詳細(xì)。本文主要研究羥自由基與無機(jī)含氧酸鹽(硫酸鹽、碳酸鹽、磷酸鹽、硝酸鹽)的作用,即研究羥自由基與無機(jī)含氧酸自由基的相互轉(zhuǎn)化作用。本文通過UV/H2O2產(chǎn)生羥自由基方法,在羥基自由基體系下加入硫酸鹽、碳酸鹽、磷酸鹽、硝酸鹽,并運(yùn)用雙滴定法滴定比較只有羥自由基體系和加入各種酸鹽的羥自由基混合體系之間的滴定液用量,來證明體系中生成了過硫酸鹽、過碳酸鹽、過磷酸鹽及過硝酸鹽,從而證明體系中有硫酸自由基、碳酸自由基、磷酸自由基及硝酸自由基產(chǎn)生。鈰量法和碘量法即雙滴定法,硫酸鈰法是利用鈰鹽溶液作為滴定劑的容量分析法。在酸性溶液中,Ce4+與還原劑作用,被還原為Ce3+,E°(Ce4+/Ce3+)=1.61伏。碘量法是氧化還原滴定法中,應(yīng)用比較廣泛的一種方法,是利用的12氧化性和I-的還原性為基礎(chǔ)的一種氧化還原方法。在雙滴定法中,硫酸鈰銨滴定原樣品中的過氧化氫的量,而硫代硫酸鈉則是滴定樣品由于光照后產(chǎn)生的過氧酸鹽的含量,因此通過分析兩種滴定液的用量,即可證明體系中生成過氧酸鹽,從而證明體系中有含氧酸自由基。另外又進(jìn)一步通過選擇染料甲基橙,通過觀察其褪色率來推斷證明羥基自由基與含氧酸鹽體系生成了新的自由基,并且其中生成的硫酸根自由基與羥自由基氧化性相當(dāng)。即不同濃度的硫酸鹽對(duì)甲基橙的生色基團(tuán)沒有很大的影響,所以進(jìn)一步驗(yàn)證了硫酸根自由基Eo=2.5V-3.1V幾乎與羥自由基(Eo＝2.7V)有著同等的氧化能力。并將此方法應(yīng)用于碳酸鹽、磷酸鹽和硝酸鹽中。
[Abstract]:Using hydroxyl radical to degrade organic compounds in water is one of the new advanced oxidation techniques in recent years. The standard redox potential of hydroxyl radical is very strong. Therefore, most of the organic pollutants can be oxidized in water. At present, the reaction mechanism of organic compounds in water is generally considered as hydrogen capture. The interaction between hydroxyl radical and various oxygenated acids is not studied in detail. In this paper, hydroxyl radical and inorganic oxygenated salt (sulfate) are mainly studied. The interaction between hydroxyl radical and inorganic oxygenated acid free radical is studied. In this paper, UV/H2O2 is used to produce hydroxyl radical. Sulfate, carbonate, phosphate and nitrate were added in hydroxyl radical system. In order to prove the formation of persulfate and percarbonate, the titration amount between hydroxyl radical system and hydroxyl radical mixed system was compared by using double titration method. Perphosphate and pernitrate, it is proved that there are sulfuric acid free radical, carbonate radical, phosphate radical and nitric acid free radical in the system. Cerium sulfate method is a volumetric analysis method in which cerium salt solution is used as titrant. In acid solution, cerium 4 is reduced to Ce3 by interaction with reducing agent. E 擄Ce4 / Ce3 / Ce3 + 1.61V. The iodometric method is a widely used method in redox titration. It is a redox method based on 12 oxidizing and I-reductive properties. In double titration, ammonium cerium sulfate titrates the amount of hydrogen peroxide in the original sample. Sodium thiosulfate is the content of peroxyates produced in titrated samples due to illumination, so it can be proved by analyzing the amount of two kinds of titration solution to produce peroxyates in the system. It is proved that there are oxygen free radicals in the system. In addition, by selecting dye methyl orange and observing its fading rate, it is proved that hydroxyl radical and oxygenate system produce new free radicals. The oxidizing properties of sulfate radical and hydroxyl radical are the same, that is, different concentrations of sulfate have no great effect on the chromophore of methyl orange. It is further proved that the sulfate radical Eo=2.5V-3.1V has almost the same oxidation ability as the hydroxyl radical EoC 2.7V. and this method has been applied to carbonate. In phosphate and nitrate.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X703

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