協(xié)同空化效應(yīng)降解水中咖啡因的研究
發(fā)布時(shí)間：2019-01-02 18:28
【摘要】：咖啡因(CAF)是世界上使用最廣泛的藥物之一,作為一種生物堿,它廣泛存在于天然植物中,咖啡因?qū)θ梭w的神經(jīng)系統(tǒng)有一定的作用,適度短期的使用它能驅(qū)除疲勞和興奮神經(jīng),如果長期且過量的使用它不但對人體造成成癮性,同時(shí),對人體也有損害作用。海洋、湖水、河流等水體中的咖啡因的高頻率出現(xiàn),以致咖啡因被當(dāng)為水污染的指示物。本文研究了兩種不同體系對CAF降解的影響,包括超聲空化協(xié)同鈷離子活化過硫酸鈉(US/Co2+/PS)體系與超聲空化協(xié)同鈷離子活化過硫酸氫鉀(US/Co2+/PMS)體系。通過不同組合工藝對咖啡因溶液的降解確定了最佳反應(yīng)條件,考察了單因素對咖啡因降解效率的影響,并且探究了咖啡因的礦化率,還研究了US/Co2+/PMS體系下水中共存物質(zhì)對咖啡因降解率的影響。本文還通過模擬計(jì)算軟件FLUENT對文丘里管、文丘里管-多孔板以及多孔板水力空化器展開模擬,探討了結(jié)構(gòu)參數(shù)及空化器類型對空化效果的影響。結(jié)果表明：(1) US/Co2+/PS體系可有效降解CAF,在初始咖啡因濃度為20 mg/L,超聲功率為200W,過硫酸鈉劑量為10mM,鈷離子濃度為0.5 mM,溶液初始pH為2.2時(shí)反應(yīng)8小時(shí),咖啡因降解率為57.4%,并且超聲空化與鈷離子活化過硫酸鈉有良好的協(xié)同效應(yīng),可以有效地加快反應(yīng)速度,增加咖啡因的降解率。(2) US/Co2+/PMS體系可快速降解CAF,在過硫酸氫鉀用量為0.5mM,鈷離子濃度為0.02 mM,溶液初始pH為7.0,初始咖啡因濃度為50 mg/L,超聲功率為200W,反應(yīng)時(shí)間為40分鐘時(shí),咖啡因幾乎被完全降解,其降解率達(dá)到了99.0%,并且超聲空化與鈷離子活化過硫酸氫鉀的協(xié)同效果明顯。增加鈷離子與過硫酸氫鉀的濃度,咖啡因的降解速率明顯加快,在過硫酸氫鉀用量為1.0 mM,鈷離子濃度為0.1mM,溶液初始pH為7.0時(shí)反應(yīng)4分鐘,相同濃度的咖啡因被完全降解。水中共存無機(jī)物(Cl-、HCO3-、NO3-)與有機(jī)物(NaA)對咖啡因?qū)Х纫虻慕到庥胁煌潭鹊囊种谱饔谩?3)對于文丘里管空化器,當(dāng)開孔率為0.025,出口錐角為6。時(shí),空化效果最好；單孔文丘里管的空化效果好于文丘里管-多孔板的空化效果；相同開孔率下,孔數(shù)越少,多孔板空化器的空化效果越好；文丘里管-多孔板的空化效果比多孔板空化器的空化效果好。
[Abstract]:Caffeine (CAF) is one of the most widely used drugs in the world. As an alkaloid, caffeine widely exists in natural plants. Caffeine plays a certain role in the nervous system of human body. Moderate short-term use of it can remove fatigue and excitatory nerves, if it is used for a long time and excessive use, it will not only cause addiction to human body, but also damage human body. Caffeine occurs so frequently in oceans, lakes, rivers and other waters that caffeine is used as an indicator of water pollution. In this paper, the effects of two different systems on the degradation of CAF were studied, including ultrasonic cavitation and cobalt ion activated sodium persulfate (US/Co2 / PS) system and ultrasonic cavitation combined cobalt ion activated potassium persulfate (US/Co2 / PMS) system. The optimum reaction conditions for the degradation of caffeine solution were determined by different combination processes. The effect of single factor on the degradation efficiency of caffeine was investigated, and the mineralization rate of caffeine was explored. The effect of coexisting substances in water on the degradation rate of caffeine in US/Co2 / PMS system was also studied. The simulation software FLUENT is used to simulate Venturi tube, Venturi tube-perforated plate and perforated plate hydraulic cavitation device, and the influence of structure parameters and cavitation type on cavitation effect is discussed. The results show that: (1) US/Co2 / PS system can effectively degrade CAF, at the initial caffeine concentration of 20 mg/L, ultrasound power of 200W, sodium persulfate dose of 10mm, cobalt ion concentration of 0.5 mM,. When the initial pH of the solution was 2. 2, the reaction time was 8 hours, the degradation rate of caffeine was 57.4, and the ultrasonic cavitation had a good synergistic effect with cobalt ion activated sodium persulfate, which could effectively accelerate the reaction rate. (2) US/Co2 / PMS system can rapidly degrade CAF, with 0.5mm potassium persulfate, 0.02 mM, solution with initial pH of 7.0 and 50 mg/L, with initial caffeine concentration of 50 mg/L,. When ultrasonic power was 200W and reaction time was 40 minutes, caffeine was almost completely degraded, and the degradation rate reached 99.0. The synergistic effect of ultrasonic cavitation and cobalt ion activation on potassium persulfate was obvious. When the concentration of cobalt ion and potassium persulfate was increased, the degradation rate of caffeine was accelerated obviously. When the amount of potassium persulfate was 1.0 mM, the concentration of cobalt ion was 0.1 mm, and the initial pH of solution was 7.0, the reaction time was 4 minutes. Caffeine of the same concentration is completely degraded. Coexisting inorganic compounds (Cl-,HCO3-,NO3-) and organic compounds (NaA) inhibited the degradation of caffeine in different degrees. (3) for Venturi tube cavitators, when the opening ratio was 0.025, the outlet cone angle was 6. The cavitation effect of single-hole Venturi tube is better than that of Venturi tube-porous plate, and the cavitation effect of porous plate cavitation device is better when the number of holes is less under the same opening rate. The cavitation effect of Venturi tube-porous plate is better than that of perforated plate cavitation device.
【學(xué)位授予單位】：齊魯工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X52
本文編號：2398829
[Abstract]:Caffeine (CAF) is one of the most widely used drugs in the world. As an alkaloid, caffeine widely exists in natural plants. Caffeine plays a certain role in the nervous system of human body. Moderate short-term use of it can remove fatigue and excitatory nerves, if it is used for a long time and excessive use, it will not only cause addiction to human body, but also damage human body. Caffeine occurs so frequently in oceans, lakes, rivers and other waters that caffeine is used as an indicator of water pollution. In this paper, the effects of two different systems on the degradation of CAF were studied, including ultrasonic cavitation and cobalt ion activated sodium persulfate (US/Co2 / PS) system and ultrasonic cavitation combined cobalt ion activated potassium persulfate (US/Co2 / PMS) system. The optimum reaction conditions for the degradation of caffeine solution were determined by different combination processes. The effect of single factor on the degradation efficiency of caffeine was investigated, and the mineralization rate of caffeine was explored. The effect of coexisting substances in water on the degradation rate of caffeine in US/Co2 / PMS system was also studied. The simulation software FLUENT is used to simulate Venturi tube, Venturi tube-perforated plate and perforated plate hydraulic cavitation device, and the influence of structure parameters and cavitation type on cavitation effect is discussed. The results show that: (1) US/Co2 / PS system can effectively degrade CAF, at the initial caffeine concentration of 20 mg/L, ultrasound power of 200W, sodium persulfate dose of 10mm, cobalt ion concentration of 0.5 mM,. When the initial pH of the solution was 2. 2, the reaction time was 8 hours, the degradation rate of caffeine was 57.4, and the ultrasonic cavitation had a good synergistic effect with cobalt ion activated sodium persulfate, which could effectively accelerate the reaction rate. (2) US/Co2 / PMS system can rapidly degrade CAF, with 0.5mm potassium persulfate, 0.02 mM, solution with initial pH of 7.0 and 50 mg/L, with initial caffeine concentration of 50 mg/L,. When ultrasonic power was 200W and reaction time was 40 minutes, caffeine was almost completely degraded, and the degradation rate reached 99.0. The synergistic effect of ultrasonic cavitation and cobalt ion activation on potassium persulfate was obvious. When the concentration of cobalt ion and potassium persulfate was increased, the degradation rate of caffeine was accelerated obviously. When the amount of potassium persulfate was 1.0 mM, the concentration of cobalt ion was 0.1 mm, and the initial pH of solution was 7.0, the reaction time was 4 minutes. Caffeine of the same concentration is completely degraded. Coexisting inorganic compounds (Cl-,HCO3-,NO3-) and organic compounds (NaA) inhibited the degradation of caffeine in different degrees. (3) for Venturi tube cavitators, when the opening ratio was 0.025, the outlet cone angle was 6. The cavitation effect of single-hole Venturi tube is better than that of Venturi tube-porous plate, and the cavitation effect of porous plate cavitation device is better when the number of holes is less under the same opening rate. The cavitation effect of Venturi tube-porous plate is better than that of perforated plate cavitation device.
【學(xué)位授予單位】：齊魯工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X52
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 施躍錦;;Fenton反應(yīng)的應(yīng)用及其影響因素的研究[J];貴州化工;2009年02期
，本文編號：2398829
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