本文關(guān)鍵詞：水體中菲的光降解途徑與影響因素研究　出處：《遼寧大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： PHE 光降解 降解途徑 影響因素

【摘要】：多環(huán)芳烴(Polycyclic Aromatic Hydrocarbon, PAHs)是一類在環(huán)境中可持久性存在的有機(jī)污染物。大部分多環(huán)芳烴具有致癌、致畸、致突變作用,可通過(guò)不同介質(zhì)的生態(tài)循環(huán)蓄積在環(huán)境和生物體內(nèi),對(duì)環(huán)境和生物體存在著巨大的潛在或直接危害。菲(Phenanthrene)是多環(huán)芳烴中比較典型的具有致癌性的K區(qū)和惰性“灣”區(qū)的三環(huán)芳烴,其分子量小、結(jié)構(gòu)較簡(jiǎn)單,已成為眾多環(huán)境科研工作者研究多環(huán)芳烴的最具代表性物質(zhì)。目前對(duì)于菲在環(huán)境中的處理辦法主要有物理法、化學(xué)法、生物法等。用物理法處理菲僅僅在不同介質(zhì)中的轉(zhuǎn)移,并未從根本上使之降解乃至消除；用生物法處理環(huán)境中的菲,雖然運(yùn)行資金少、處理效率高、無(wú)二次環(huán)境污染,但生物法處理時(shí)耗費(fèi)時(shí)間長(zhǎng)且有地域性差異、適用范圍有較大限制；用化學(xué)法特別是高級(jí)氧化技術(shù)處理菲,降解效果好、處理時(shí)間短、無(wú)太大環(huán)境要求,但處理成本較高。鑒于此,本論文提出通過(guò)利用光源并添加一些輔助物質(zhì)光化學(xué)降解菲,以期降低處理成本和達(dá)到較好的處理效果。研究了菲的光化學(xué)降解處理方法。首先,針對(duì)菲在環(huán)境中光化學(xué)降解途徑進(jìn)行了研究,通過(guò)含氧環(huán)境(好氧-厭氧)的不同考察了菲光降解狀態(tài)是直接光降解或間接光降解。其次,通過(guò)查閱文獻(xiàn)選擇PHE初始濃度、pH、HA濃度、Cl-濃度、NO3-濃度、H2O2濃度六個(gè)影響因素考察對(duì)菲的光降解過(guò)程影響。最后,在單因素實(shí)驗(yàn)基礎(chǔ)上篩選影響因素進(jìn)一步考察各因素之間交互作用對(duì)菲光降解的影響。得出以下結(jié)論：針對(duì)不同光源和不同含氧條件進(jìn)行了菲光降解實(shí)驗(yàn),好氧條件下紫外光源照射180 min菲將降解效率最好,作為后續(xù)實(shí)驗(yàn)基礎(chǔ)條件。菲光降解途徑實(shí)驗(yàn)中發(fā)現(xiàn),好氧條件下,菲的光降解過(guò)程以光氧化過(guò)程為主,直接光降解和光敏化降解為輔助；厭氧條件下,菲的光降解過(guò)程通過(guò)直接光降解。整個(gè)光降解過(guò)程有活性氧物種1O2、·OH參與。菲的單因素實(shí)驗(yàn)中,在實(shí)驗(yàn)范圍內(nèi),隨PHE的初始濃度的增加菲光降解效率不斷降低,從而起到抑制作用；pH值對(duì)菲的光降解過(guò)程影響效果不大,菲光降解效率較平緩波動(dòng)；Cl-濃度和NO：,-濃度隨著濃度不斷增加對(duì)菲的光降解反應(yīng)過(guò)程起到了促進(jìn)作用；HA在實(shí)驗(yàn)范圍內(nèi)隨著自身濃度的不斷增加,菲光降解效率也不斷降低,HA起到抑制作用；H2O2隨著濃度的不斷增加,菲的光降解效率先增大后減小。中心組合實(shí)驗(yàn)設(shè)計(jì)四因子五水平實(shí)驗(yàn),考察了不同因素(PHE初始濃度、HA濃度、H2O2濃度、C1-濃度)之間交互作用對(duì)菲光降解過(guò)程的影響。實(shí)驗(yàn)結(jié)果表明：四個(gè)影響因素均是菲光降解過(guò)程的顯著性影響因素,影響順序?yàn)镠A濃度PHE初始濃度H2O2濃度Cl-濃度；經(jīng)過(guò)多因素實(shí)驗(yàn)優(yōu)化得出,在PHE初始濃度2.8μM、HA Omg/L、H2O2濃度0.05mM、C1濃度0.5M時(shí),菲的光降解效率可達(dá)52.75%。
[Abstract]:Polycyclic Aromatic Hydrocarbon (PAHs) is a class of organic pollutants that can persist in the environment. Most PAHs have carcinogenic, teratogenic and mutagenic effects. They can accumulate in the environment and organisms through different ecological cycles, which have great potential or direct harm to environment and organisms. Phenanthrene (Phenanthrene) is a typical carcinogenic K region and inert Bay area of PAHs. Its molecular weight is small and its structure is relatively simple. It has become the most representative material for many environmental researchers to study polycyclic aromatic hydrocarbons. At present, there are mainly physical, chemical and biological methods for the treatment of phenanthrene in the environment. By physical Fa Lee Faye only in different medium, the degradation did not fundamentally make use of biological treatment and eliminate; environment in Philippines, while running less capital, high treatment efficiency, no two pollution, but when the biological process takes a long time and there are regional differences, larger applicable range limit by using chemical method; especially the advanced oxidation technology of phenanthrene, degradation effect, short treatment time, no big environmental requirements, but the high cost of processing. In view of this, this paper proposed that the photochemical degradation of phenanthrene by using light source and adding some auxiliary materials to reduce the cost of treatment and to achieve better treatment effect. The photochemical degradation treatment of phenanthrene was studied. First, the photochemical degradation pathways of phenanthrene in the environment were studied. The degradation of phenanthrene was directly photodegradation or indirect photodegradation through the different oxygen environment (aerobic anaerobic). Secondly, six factors, including initial concentration of PHE, pH concentration, HA concentration, Cl- concentration, NO3- concentration and H2O2 concentration, were selected to investigate the photodegradation process of phenanthrene. Finally, the influence factors of interaction on phenanthrene photodegradation were further investigated on the basis of single factor experiments. The following conclusions are drawn: for different light sources and different oxygen conditions, phenanthrene photodegradation experiment is carried out. Under ultraviolet irradiation, 180 min phenanthrene will give the best degradation efficiency under aerobic condition, which will serve as a basic condition for subsequent experiments. In the experiment of phenanthrene photodegradation, it is found that photodegradation is the main process of photodegradation of phenanthrene under aerobic conditions, and photodegradation and photosensitization degradation are the main auxiliary. Under anaerobic conditions, the photodegradation process of phenanthrene is directly photodegraded. The whole photodegradation process is involved in the active oxygen species 1O2,. OH. Single factor experiment of phenanthrene, in the experimental range, with the increase of initial PHE concentration of phenanthrene degradation efficiency decreases, thus inhibiting effect; pH value of phenanthrene degradation process has little effects, the Philippines photodegradation efficiency with gentle fluctuation; the concentration of Cl- and NO:, with the concentration increasing light concentration degradation of phenanthrene promoted; HA in the experimental range, with the increase of its concentration, the Philippines photodegradation efficiency also decreases, HA plays an inhibitory effect; with the increase of H2O2 concentration, the photodegradation efficiency of phenanthrene increased first and then decreased. The central composite experiment was designed with four factor and five level experiment. The interaction between different factors (PHE initial concentration, HA concentration, H2O2 concentration and C1- concentration) on the degradation process of phenanthrene was investigated. The experimental results show that the four factors are significant factors that influence the photocatalytic degradation process of phenanthrene, influence the order of HA concentration of initial PHE concentration H2O2 Cl- concentration; after the optimum factors, in the initial concentration of PHE 2.8 M, HA Omg/L, H2O2 0.05mM, C1 concentration 0.5M concentration, the photocatalytic degradation of phenanthrene the efficiency can reach 52.75%.
【學(xué)位授予單位】：遼寧大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：X52

【參考文獻(xiàn)】

相關(guān)期刊論文 前4條

1 李加付;劉少鵬;劉相敏;馬乾耀;韓彬;李先國(guó);;渤海及鄰近海域表層沉積物中多環(huán)芳烴的來(lái)源解析[J];海洋環(huán)境科學(xué);2015年03期

2 李先國(guó);鄧偉;周曉;唐旭利;虢新運(yùn);王巖;;青島近岸表層海水中PAHs的分布特征及物源初步解析[J];環(huán)境科學(xué);2012年03期

3 張先勇;王軼;楊寶;刁曉平;;�？跒乘w中多環(huán)芳烴(PAHs)濃度及來(lái)源研究[J];環(huán)境科學(xué)與技術(shù);2012年02期

4 趙文昌;程金平;謝海;馬英歌;王文華;;環(huán)境中多環(huán)芳烴(PAHs)的來(lái)源與監(jiān)測(cè)分析方法[J];環(huán)境科學(xué)與技術(shù);2006年03期

，

本文編號(hào)：1340235