本文選題：脈沖放電等離子體 + 對(duì)硝基酚��； 參考：《江蘇大學(xué)》2017年碩士論文

【摘要】：基于傳統(tǒng)修復(fù)方法修復(fù)有機(jī)污染土壤的局限,以及脈沖放電等離子體(pulsed discharge plasma,PDP)技術(shù)的諸多優(yōu)點(diǎn),本研究采用PDP技術(shù)處理污染土壤中的有機(jī)物。研究首先建立了對(duì)硝基酚(p-Nitrophenol,PNP)污染土壤的PDP處理體系,考察不同參數(shù)條件對(duì)于污染土壤中PNP降解的影響;其次,鑒于現(xiàn)實(shí)土壤污染的復(fù)雜性,研究模擬了PNP-Cu~(2+)復(fù)合污染土壤,并探究了各自濃度變化對(duì)于PNP降解率的影響,同時(shí)考察了添加粘土對(duì)于污染土壤的影響;最后,建立光譜檢測(cè)體系,通過(guò)考察不同條件下體系中·OH和·O的相對(duì)含量及變化規(guī)律,說(shuō)明·OH和·O在PDP修復(fù)有機(jī)污染土壤中的關(guān)鍵作用。研究結(jié)果歸納如下:(1)建立了七針-網(wǎng)式的脈沖放電等離子體土壤修復(fù)體系,以PNP為目標(biāo)物,分別從電氣參數(shù)、土壤特性及載氣參數(shù)三方面考察了脈沖放電等離子體技術(shù)對(duì)PNP污染土壤修復(fù)的有效性,研究得出:脈沖峰值電壓越高、PNP初始濃度越低、酸性環(huán)境及氧氣環(huán)境都可以提高修復(fù)體系中PNP的降解效率。通過(guò)定量分析,得出以空氣為載氣的反應(yīng)體系中PNP的兩個(gè)主要降解中間產(chǎn)物為苯酚和鄰苯二酚。(2)考察了PDP修復(fù)PNP體系中存在重金屬離子Cu~(2+)對(duì)PNP降解情況的影響以及粘土礦物——高嶺土的添加對(duì)PNP去除效果的影響規(guī)律。研究結(jié)果表明:當(dāng)污染土壤中存在不同濃度的Cu~(2+)和一定濃度的PNP時(shí),PNP降解率隨著Cu~(2+)的加入而明顯提高,且Cu~(2+)濃度越高,PNP降解率提高的越多;當(dāng)向污染土壤中添加一定比例的高嶺土并吸附一定時(shí)間后,不論是PNP污染土壤或是PNP-Cu~(2+)復(fù)合污染土壤,經(jīng)PDP作用后,PNP的降解率都得到了明顯提升。以上研究結(jié)果說(shuō)明Cu~(2+)或高嶺土的存在,均能提高PDP體系中PNP降解效果。(3)采用光譜檢測(cè)技術(shù)測(cè)定載氧環(huán)境下PDP修復(fù)污染土壤體系中·OH和·O相對(duì)發(fā)射光譜強(qiáng)度的變化。通過(guò)對(duì)比實(shí)驗(yàn)分別考察了不添加土壤、添加原土、添加有機(jī)污染土壤和添加有機(jī)-重金屬?gòu)?fù)合污染土壤的PDP體系中·OH和·O的相對(duì)發(fā)射光譜強(qiáng)度變化,同時(shí)考察了脈沖峰值電壓、電極間距和O_2體積流量變化對(duì)·OH和·O的相對(duì)發(fā)射光譜強(qiáng)度的影響。研究結(jié)果表明:添加土壤有利于放電的發(fā)生而提高了PDP體系中·OH和·O的生成;添加有機(jī)污染土壤的PDP體系中·OH和·O發(fā)射光譜強(qiáng)度較原土體系中低,證明了PDP體系中·OH和·O于有機(jī)物的氧化作用;重金屬離子的加入對(duì)于體系中有機(jī)物的自由基的生成有積極的促進(jìn)作用。同時(shí),脈沖峰值電壓和O_2體積流量的增加有利于PDP體系中·OH和·O的產(chǎn)生,而電極間距的增加不利于PDP修復(fù)污染體系中·OH和·O的生成。該部分研究說(shuō)明了·OH和·O在PDP用于污染土壤修復(fù)體系中的關(guān)鍵作用。
[Abstract]:Based on the limitation of the traditional remediation method and the advantages of pulsed discharge plasma-PDP (pulsed discharge plasma) technique, the organic matter in contaminated soil was treated by PDP. Firstly, the PDP treatment system of p-nitrophenol p-NitrophenolPNP) contaminated soil was established, and the effects of different parameters on PNP degradation in polluted soil were investigated. Secondly, in view of the complexity of actual soil pollution, the PNP-CuPNP2) contaminated soil was simulated. The effects of different concentrations on the degradation rate of PNP and the effect of adding clay on the contaminated soil were investigated. Finally, a spectrum detection system was established to investigate the relative content and variation of OH and O in the system under different conditions. The key role of OH and O in PDP remediation of organic contaminated soil was explained. The results are summarized as follows: (1) A seven-needle / netted pulsed discharge plasma soil remediation system is established. The PNP is taken as the target material, and the electrical parameters are taken into account. The effectiveness of pulsed discharge plasma technology in remediation of PNP contaminated soil was investigated from three aspects: the higher the peak voltage of pulse and the lower the initial concentration of PNP, the higher the peak voltage of the pulse was, the lower the initial concentration of PNP was. Acid environment and oxygen environment can improve the degradation efficiency of PNP in the remediation system. Through quantitative analysis, Two main degradation intermediates of PNP were phenol and catechol. 2) the effect of heavy metal ion CuPN 2) on PNP degradation and clay minerals were investigated. -the effect of kaolin addition on the removal of PNP. The results showed that the degradation rate of PNP in polluted soil increased with the addition of Cu2) and the degradation rate of PNP increased with the concentration of Cu (2). The higher the concentration was, the more the degradation rate of PNP was increased, and the higher the concentration was, the higher the degradation rate of PNP was. The higher the concentration was, the higher the degradation rate of PNP was. When a certain proportion of kaolin was added to the contaminated soil and adsorbed for a certain time, the degradation rate of PNP in PNP contaminated soil or PNP-CuP- (2) compound contaminated soil was obviously increased after PDP treatment. The above results show that the existence of Cujian2) or kaolin can improve the degradation effect of PNP in PDP system. The spectral detection technique is used to determine the changes of OH and O emission spectra in PDP remediation contaminated soil system under oxygen loading environment. The changes of the relative emission intensity of OH and O in PDP system without adding soil, adding original soil, adding organic contaminated soil and adding organic-heavy metal compound contaminated soil were investigated by contrast experiment. The peak pulse voltage was also investigated. The effects of electrode spacing and O _ 2 volume flow on the relative emission spectra of OH and O were investigated. The results showed that the formation of OH and O in PDP system was improved by adding soil, and the intensity of OH and O emission in PDP system was lower than that in original soil system. It is proved that the oxidation of OH and O in PDP system and the addition of heavy metal ions can promote the formation of free radicals in PDP system. At the same time, the increase of peak pulse voltage and volume flow of O _ 2 is beneficial to the production of OH and O in PDP system, but the increase of electrode spacing is not conducive to the formation of OH and O in PDP remediation system. In this part, the key role of OH and O in the remediation system of contaminated soil by PDP was explained.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：X53

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