本文選題：高鐵酸鉀　切入點：預(yù)氧化　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：傳統(tǒng)的氧化劑,如臭氧、高錳酸鹽、次氯酸鹽等,在使用過程中很容易產(chǎn)生對環(huán)境有毒有害的二次污染物,因此有一定的局限性。高鐵酸鉀中的高鐵酸根具有極強的氧化性,同時,高鐵酸鉀在使用中不會產(chǎn)生任何二次污染物,其被還原生成的低價鐵還兼具混凝/助凝的效果,因此,高鐵酸鉀是一種高效、清潔、多功能的水處理劑,近年來,已經(jīng)受到了越來越多的研究者的關(guān)注。本文首先利用次氯酸鹽氧化法制備了高鐵酸鉀固體,分析了可能影響高鐵酸鉀制備產(chǎn)率或純度的因素,并以紅外光譜法對高鐵酸鉀進行定性分析,隨后對比分析了高鐵酸鉀的三種定量測定方法:氧化還原滴定法、Fe~(2+)-Phen分光光度法(間接分光光度法)和直接分光光度法,得出本論文主要的測定方法。接下來考察了高鐵酸鉀溶液的在不同條件下的穩(wěn)定性變化,主要的考察因素有濃度、溫度、pH、Fe3+及Si032-。在高鐵酸鉀的應(yīng)用部分,考察了高鐵酸鉀預(yù)氧化強化混凝的效果,考察指標(biāo)有濁度、色度、UV254及TOC,最后初步探索了高鐵酸鉀預(yù)氧化強化混凝對Mn~(2+)的去除效果。主要研究結(jié)果如下:在15℃的反應(yīng)溫度或36h的真空干燥時間下制備的高鐵酸鉀純度能達到98%左右,鐵鹽投加量過多時,多余的Fe3+會催化FeO42-的分解而使其產(chǎn)率下降。相對于氧化還原滴定法和間接分光光度法的測定結(jié)果,高鐵酸鉀的直接分光光度法測定誤差最高分別僅為0.44%和2.37%,高鐵酸鉀溶液中殘留的Fe(OH)3和Fe(Ⅲ)都會影響高鐵酸鉀測定的準(zhǔn)確性。通過研究高鐵酸鉀溶液在不同條件下的分解規(guī)律發(fā)現(xiàn),高鐵酸鉀溶液的穩(wěn)定性隨著自身濃度和溫度的增大均降低,而高鐵酸鉀溶液在pH值為10左右時穩(wěn)定最好,此外,Fe3+促進了高鐵酸鉀溶液的分解,而向高鐵酸鉀溶液中投加低濃度(10-30mg/L)Si032-離子有助于提高其穩(wěn)定性。只投加PAC為對原水的濁度、色度、UV254和TOC的去除率分別為81.67%、38.32%、72.15%和13.48%;而利用高鐵酸鉀、高錳酸鉀及高鐵酸鉀復(fù)合藥劑預(yù)氧化強化混凝后,濁度去除率分別能達到94.2%、90%和95.8%;色度去除率分別能達到49.22%、42.99%和52.02%;UV254去除率分別能達到84.81%、77.2%和97.34%;TOC去除率分別能達到21.12%、20.92%和 24.11%單獨投加PAC對水中Mn~(2+)基本沒有去除效果,而通過高鐵酸鉀預(yù)氧化強化混凝后,其對水中Mn~(2+)的去除效果明顯提升,高鐵酸鉀投加量為0.6～0.8mg/L時,剩余錳下降最為明顯,而氧化時間在5min內(nèi)時,對水中Mn~(2+)去除效果最好,隨著pH的升高,高鐵酸鉀對Mn~(2+)的去除率逐漸增大,pH值接近12時,2mg/L的高鐵酸鉀已經(jīng)能夠去除超過50%的Mn~(2+)。
[Abstract]:Traditional oxidants, such as ozone, permanganate and hypochlorite, can easily produce toxic and harmful secondary pollutants to the environment. At the same time, potassium ferrate does not produce any secondary pollutants in use, and the reduced low iron also has the effect of coagulation / coagulation. Therefore, potassium ferrate is an efficient, clean and multifunctional water treatment agent. In this paper, potassium ferrate solids were prepared by hypochlorite oxidation method, and the factors that may affect the yield or purity of potassium ferrate preparation were analyzed. The qualitative analysis of potassium ferrate was carried out by infrared spectroscopy, and three quantitative determination methods of potassium ferrate were compared and analyzed: redox titration (indirect spectrophotometry) and direct spectrophotometry (direct spectrophotometry). The main determination methods of this paper are obtained. Then the stability of potassium ferrate solution under different conditions is investigated. The main factors are concentration, temperature, pH, Fe _ 3 and Si _ 032-.The main factors are the application of potassium ferrate. The effect of preoxidation of potassium ferrate on coagulation was investigated. Finally, the removal effect of potassium ferrate preoxidation enhanced coagulation on Mn~(2) was preliminarily explored. The main results were as follows: the purity of potassium ferrate prepared under the condition of 15 鈩，

本文編號：1598112