發(fā)布時間：2018-05-04 13:34

  本文選題：電氣石 + 直接紅23�。� 參考：《吉林大學(xué)》2016年碩士論文

【摘要】：染料廢水的大量排放造成了嚴重的水污染現(xiàn)象,威脅環(huán)境與人類的安全,其中偶氮染料是應(yīng)用較為廣泛的染料。偶氮染料廢水由于化學(xué)需氧量較高、較難降解等特點是目前染料廢水降解研究的重點。電氣石作為一種對環(huán)境非常有利的礦物質(zhì)被廣泛應(yīng)用于污染物的去除,常見的利用電氣石去除污染物的方法主要有吸附法和高級氧化工藝。電氣石的pHZPC為6.17,表面呈多孔結(jié)構(gòu),在酸性條件下能夠析出Fe2+和Fe3+,該性質(zhì)為電氣石作為高級氧化工藝的催化劑提供了可能。本文中所使用的電氣石經(jīng)XPS分析可知,Fe(II)與Fe(III)的比例為50.47%:49.53%。通過對電氣石粉末的XRD分析可知,電氣石的晶體結(jié)構(gòu)式為NaFe3Al6[Si6O18][BO3]3(OH)4。通過對TM(電氣石)、(過硫酸鹽)PS、PS/US(過硫酸鹽/超聲)、TM/PS(電氣石/過硫酸鹽)、TM/PS/US-10min(電氣石/過硫酸鹽/超聲-10min)各系統(tǒng)的動力學(xué)研究,發(fā)現(xiàn)染料廢水的氧化降解過程屬于二階動力學(xué)反應(yīng)。超聲能夠促進染料廢水的降解,其降解率能夠高達92%。對比不同催化劑在無超聲和有超聲條件下催化過硫酸鹽降解直接紅23的研究發(fā)現(xiàn),電氣石由于其高去除率以及廉價易得的特性相較于其他催化劑更有優(yōu)勢。同時,研究通過測定反應(yīng)過程中各催化劑系統(tǒng)中的Fe2+的含量,發(fā)現(xiàn)Fe2+的含量與催化劑對染料廢水的處理效果具有一致性。TM/PS和TM/PS/US-10min系統(tǒng)分別對三種不同性質(zhì)的偶氮染料進行降解,研究發(fā)現(xiàn)電氣石催化氧化法對不同性質(zhì)的染料廢水具有適用性。不同無機鹽離子對高級氧化工藝降解直接紅23的影響,發(fā)現(xiàn)各無機鹽離子對反應(yīng)的影響程度為NaClO4≈NaNO3Na2SO4NaClNa2HPO4,由此可見Na2HPO4離子強度對反應(yīng)的影響最大,經(jīng)分析可知HPO42-能夠消耗反應(yīng)系統(tǒng)中的SO4-·的量。超聲時間和超聲功率能夠影響電氣石催化氧化降解直接紅23的效果。電氣石催化過硫酸鹽降解直接紅23不僅能夠?qū)θ玖蠌U水進行脫色,同時能夠有效的降低染料廢水的COD和真色色度(ADMI),研究表明系統(tǒng)對三種偶氮染料廢水的COD的去除率都高于90%以上。通過研究直接紅23降解過程中波長掃描圖發(fā)現(xiàn),在波長為504nm和310nm處的吸收峰逐漸由陡到緩,峰高逐漸變低,這是由于位于504nm代表偶氮染料的-N=N-鍵遭到破壞,位于310nm處的與-N=N-相連的苯環(huán)被破壞。電氣石樣品的重復(fù)利用實驗充分顯示電氣石在氧化實驗中的可重復(fù)利用性。每一次經(jīng)重復(fù)利用后,電氣石催化過硫酸鹽降解DR23的效果就有所降低,當(dāng)重復(fù)利用四次后其降解率為43%。
[Abstract]:The discharge of dye wastewater causes serious water pollution and threatens the environment and human safety. Azo dyes are widely used. The degradation of azo dye wastewater is very important because of its high oxygen demand and difficult degradation. Tourmaline is widely used in the removal of pollutants as a mineral which is very beneficial to the environment. The common methods of removing pollutants by tourmaline are adsorption and advanced oxidation process. The pHZPC of tourmaline is 6.17, the surface of tourmaline is porous, and Fe2 and Fe3 can be precipitated under acidic conditions. This property makes it possible for tourmaline to be used as catalyst for advanced oxidation process. The XPS analysis of tourmaline used in this paper shows that the ratio of Fe (II) to Fe (II) is 50.47: 49.53. The XRD analysis of tourmaline powder shows that the crystal structure formula of tourmaline is NaFe3Al6 [Si6O18] [BO3] 3OHH4. The kinetics of TMS-PS-10min (tourmaline / persulfate / PS-10min) system is studied. It is found that the degradation process of dye wastewater is a second-order kinetic reaction. Ultrasound can promote the degradation of dye wastewater, and the degradation rate can be as high as 92%. Compared with the results of catalytic degradation of direct red 23 with persulfate without ultrasound and with ultrasound, it is found that tourmaline is superior to other catalysts because of its high removal rate and low cost. At the same time, through the determination of Fe2 content in each catalyst system during the reaction, it was found that the content of Fe2 was consistent with the treatment effect of the catalyst on dye wastewater. TMP / PS and TM/PS/US-10min system respectively degraded three kinds of azo dyes with different properties. It is found that tourmaline catalytic oxidation is suitable for dye wastewater with different properties. The effect of different inorganic salt ions on the degradation of direct red 23 was found to be NaClO4 鈮，

本文編號：1843157