本文關(guān)鍵詞：陰極協(xié)同過硫酸鹽降解苯酚的研究　出處：《華中科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 過硫酸鹽 苯酚 陰極 Fe~(2+) Fe~(3+)

【摘要】：基于過硫酸鹽(S2O82-,PS)活化的高級(jí)氧化技術(shù)(Advanced oxidation processes,AOPs)以其氧化能力強(qiáng)、價(jià)格低廉、穩(wěn)定性好、反應(yīng)產(chǎn)物溫和等優(yōu)點(diǎn)成為一種非常有發(fā)展前景和應(yīng)用潛力的除污染技術(shù)。本文以來(lái)源廣泛、毒性較高的典型酚類污染物苯酚為目標(biāo)污染物,探討了以低濃度Fe2+(Fe3+)為活化劑,并且引入陰極的Cathode(Pt)/PS/Fe2+(Fe3+)體系對(duì)苯酚降解的可行性,較系統(tǒng)全面地考察和分析了各實(shí)驗(yàn)因素對(duì)降解效果的影響,提出了表征過硫酸鈉和電流利用率的參數(shù)△[PS]/[e-],并簡(jiǎn)要分析了該體系的作用機(jī)理。通過對(duì)照實(shí)驗(yàn)結(jié)果分析可知,以低濃度的Fe2+(Fe3+)為活化劑的Cathode/PS/Fe2+(Fe3+)體系能有效降解苯酚,并且較傳統(tǒng)的過渡金屬活化體系和電化學(xué)強(qiáng)化體系更加節(jié)能省料。影響因素實(shí)驗(yàn)分析表明,苯酚的降解速率隨電流密度的增大先增大之后趨于穩(wěn)定,而過大的電流密度下,體系會(huì)由于pH的升高使溶解性鐵元素濃度迅速降低而崩潰;苯酚的降解速率與初始Fe2+濃度正相關(guān);與支持電解質(zhì)(硫酸鈉)濃度負(fù)相關(guān);而隨過硫酸鈉濃度的增大先增大再減小,在初始過硫酸鈉濃度為14.17 mmol L-1時(shí)達(dá)到最大。反應(yīng)過程的化學(xué)分析和數(shù)學(xué)分析說明,。由于陰極條件下過硫酸鈉的在陰極還原的必然性,過硫酸鈉和電流的利用率無(wú)法達(dá)到100%,即△[PS]/[e-]總小于1;而該值,即過硫酸鈉和電流的利用率與電流密度負(fù)相關(guān),與初始Fe2+濃度和過硫酸鈉濃度正相關(guān),隨支持電解質(zhì)濃度的增大先增大后減小,在支持電解質(zhì)濃度為50 mmol L-1時(shí)達(dá)到最大。機(jī)理研究反映出該體系的核心是Fe2+/Fe3+循環(huán),一切影響到該循環(huán)的因素都會(huì)影響到苯酚的降解;該體系降解苯酚的中間產(chǎn)物有苯二酚(對(duì)苯二酚、鄰苯二酚、間苯二酚)、苯醌和馬來(lái)酸等,而降解苯酚的活性自由基既有硫酸根自由基,也有羥基自由基;苯酚的降解在主要時(shí)間段內(nèi)符合零級(jí)反應(yīng)動(dòng)力學(xué)方程。
[Abstract]:Advanced oxidation processes (AOPs), an advanced oxidation technology based on the activation of S _ 2O _ 82-O _ (2) P _ (2) O _ (2) O _ (2) O _ (2), is characterized by its high oxidation ability. The advantages of low price, good stability and mild reaction products have become a promising and potential decontamination technology. Phenol, a typical phenolic pollutant with high toxicity, was used as the target pollutant. The low concentration of Fe2 Fe3) was used as activator. The feasibility of phenol degradation by Cathode(Pt)/PS/Fe2 Fe3 (cathode) system was investigated and analyzed systematically and comprehensively. The parameters to characterize the utilization of sodium persulfate and current were proposed. [PS] /. [The mechanism of the system was analyzed briefly, and the results were compared with the experimental results. Phenol can be effectively degraded by Cathode/PS/Fe2 Fe _ 3) system with low concentration of Fe2 _ (Fe _ 3) as activator. The experimental results show that the degradation rate of phenol increases firstly with the increase of current density and then tends to be stable. However, when the current density is too high, the system will collapse because the concentration of dissolved iron decreases rapidly with the increase of pH. The degradation rate of phenol was positively correlated with the initial Fe2 concentration. Negative correlation with the concentration of supporting electrolyte (sodium sulfate); However, with the increase of sodium persulfate concentration, the initial concentration of sodium persulfate increased first and then decreased, and reached the maximum when the initial concentration of sodium persulfate was 14.17 mmol L-1. The chemical analysis and mathematical analysis of the reaction process showed that. Because of the inevitability of cathodic reduction of sodium persulfate under cathodic conditions, the utilization ratio of sodium persulfate and current cannot reach 100%. [PS] /. [E-] is always less than 1; However, the utilization ratio of sodium persulfate and current was negatively correlated with current density and positively correlated with initial Fe2 concentration and sodium persulfate concentration, and increased first and then decreased with the increase of supporting electrolyte concentration. The results show that the core of the system is the Fe2 / Fe _ 3 cycle when the supporting electrolyte concentration is 50 mmol 路L ~ (-1). All factors affecting this cycle will affect the degradation of phenol; The intermediate products of degradation of phenol include hydroquinone, catechol, resorcinol, benzoquinone and maleic acid, etc. The degradation of phenol obeys the zero order reaction kinetics equation in the main time period.
【學(xué)位授予單位】：華中科技大學(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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