水中强氧化粒子的检测及应用研究
发布时间：2018-07-31 06:55
【摘要】：近年来,高级氧化技术(Advanced Oxidation Processes,AOPs)在环境领域得到广泛的应用。强氧化粒子作为高级氧化技术的核心,主要包括·OH、H2O2、O2-、HO2-等氧化性粒子,它们具有强氧化性、无选择性和寿命短等特点,可以有效氧化降解水体中有机物、灭杀微生物等。其中·OH是AOPs中重要的产物,如何高效、规模制备·OH是AOPs的核心问题。但由于·OH存在寿命极短,如何快速检测·OH的生成浓度亦是AOPs的难点。本文以强氧化粒子·OH的产生和检测为研究内容,通过大气压强电离放电协同气液混溶装置高效制备以·OH为主的强氧化粒子。建立了基于荧光分光光度法和高效液相色谱法检测水体中·OH浓度的方法,同时采用过氧化氢酶(CAT)结合DPD可见分光光度法检测了水体中生成·OH的引发剂H2O2的浓度。考察了总氧化剂浓度(Total residual oxidants,TRO)与·OH和H2O2产生量的关系,探讨了系统的气液比、pH值和温度对·OH和H2O2产生量的影响,并研究以龙王塘水库水和海水为背景水产生强氧化粒子的应用和不同水质条件对·OH和H2O2产量的影响,以及处理后水样的常规水质和相关化学物质指标的变化情况。研究结果表明,在中性条件下,水温为298 K,纯水TRO为15.43 mg/L时,生成的·OH和H2O2浓度分别为62.49 μmol/L、2.04 mg/L,TRO与生成的·OH和H2O2浓度均呈线性正相关,R2分别为0.9919和0.9961;提高系统的气液比可以增加·OH和H2O2的生成量,且气液比与TRO呈线性正相关。碱性条件下有利于·OH的生成,温度为323 K时,·OH达到最大生成量。以龙王塘水作为背景水产生强氧化粒子溶液,当TRO为19.41 mg/L时生成的·OH和H2O2浓度分别为49.77 μmol/L和2.77 mg/L;以海水为背景水,当TRO为15.06 mg/L时生成的·OH和H2O2浓度分别为36.20 μmol/L和2.11 mg/L;对处理后的龙王塘水和海水的常规水质和相关化学物质进行检测发现水质变好、有机物减少、没有其它化学物质产生。
[Abstract]:In recent years, advanced oxidation technology (Advanced Oxidation processes AOPs) has been widely used in the field of environment. As the core of advanced oxidation technology, strong oxidized particles mainly include oxidizing particles such as OHH _ 2O _ 2O _ 2-H _ 2O _ 2-H _ 2O _ 2-. They have the characteristics of strong oxidation, non-selectivity and short life, so they can effectively oxidize and degrade organic matter in water body and kill microorganisms and so on. OH is an important product in AOPs. How to prepare OH efficiently and on a large scale is the core problem of AOPs. However, due to the short lifetime of OH, it is difficult to detect the concentration of OH formation quickly in AOPs. In this paper, the production and detection of strongly oxidized particles (OH) were studied. The strong oxidized particles were prepared efficiently by atmospheric pressure ionization and discharge combined with gas-liquid mixing device. A method for the determination of OH concentration in water was established based on fluorescence spectrophotometry and high performance liquid chromatography. The concentration of OH producing initiator H2O2 in water was determined by catalase (CAT) and DPD visible spectrophotometry. The relationship between total oxidant concentration (Total residual oxidants TRO) and the production of OH and H2O2 was investigated. The effects of pH value and temperature of the system on the production of OH and H2O2 were discussed. The application of strong oxidized particles in the water and seawater of Longwangtang Reservoir and the effects of different water quality conditions on the production of OH and H2O2, as well as the changes of conventional water quality and related chemical indexes of treated water samples were studied. The results show that under neutral conditions, the water temperature is 298K and the TRO of pure water is 15.43 mg/L. The concentration of OH and H2O2 was 62.49 渭 mol / L 2.04 mg 路L ~ (-1) 路L ~ (-1), respectively. The linear positive correlation between the concentration of OH and H2O2 and the concentration of OH and H2O2 were 0.9919 and 0.9961, respectively. Increasing the gas-liquid ratio of the system could increase the yield of OH and H2O2, and the ratio of gas to liquid had a linear positive correlation with TRO. It is advantageous to the formation of OH under alkaline condition. When the temperature is 323K, the maximum amount of OH is obtained. Using Longwangtang water as background water, strong oxidized particle solution was produced. When TRO was 19.41 mg/L, the concentration of OH and H2O2 were 49.77 渭 mol/L and 2.77 mg / L, respectively. When TRO was 15.06 mg/L, the concentration of OH and H2O2 were 36.20 渭 mol/L and 2.11 mg / L, respectively.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703;X52
本文编号：2154785
[Abstract]:In recent years, advanced oxidation technology (Advanced Oxidation processes AOPs) has been widely used in the field of environment. As the core of advanced oxidation technology, strong oxidized particles mainly include oxidizing particles such as OHH _ 2O _ 2O _ 2-H _ 2O _ 2-H _ 2O _ 2-. They have the characteristics of strong oxidation, non-selectivity and short life, so they can effectively oxidize and degrade organic matter in water body and kill microorganisms and so on. OH is an important product in AOPs. How to prepare OH efficiently and on a large scale is the core problem of AOPs. However, due to the short lifetime of OH, it is difficult to detect the concentration of OH formation quickly in AOPs. In this paper, the production and detection of strongly oxidized particles (OH) were studied. The strong oxidized particles were prepared efficiently by atmospheric pressure ionization and discharge combined with gas-liquid mixing device. A method for the determination of OH concentration in water was established based on fluorescence spectrophotometry and high performance liquid chromatography. The concentration of OH producing initiator H2O2 in water was determined by catalase (CAT) and DPD visible spectrophotometry. The relationship between total oxidant concentration (Total residual oxidants TRO) and the production of OH and H2O2 was investigated. The effects of pH value and temperature of the system on the production of OH and H2O2 were discussed. The application of strong oxidized particles in the water and seawater of Longwangtang Reservoir and the effects of different water quality conditions on the production of OH and H2O2, as well as the changes of conventional water quality and related chemical indexes of treated water samples were studied. The results show that under neutral conditions, the water temperature is 298K and the TRO of pure water is 15.43 mg/L. The concentration of OH and H2O2 was 62.49 渭 mol / L 2.04 mg 路L ~ (-1) 路L ~ (-1), respectively. The linear positive correlation between the concentration of OH and H2O2 and the concentration of OH and H2O2 were 0.9919 and 0.9961, respectively. Increasing the gas-liquid ratio of the system could increase the yield of OH and H2O2, and the ratio of gas to liquid had a linear positive correlation with TRO. It is advantageous to the formation of OH under alkaline condition. When the temperature is 323K, the maximum amount of OH is obtained. Using Longwangtang water as background water, strong oxidized particle solution was produced. When TRO was 19.41 mg/L, the concentration of OH and H2O2 were 49.77 渭 mol/L and 2.77 mg / L, respectively. When TRO was 15.06 mg/L, the concentration of OH and H2O2 were 36.20 渭 mol/L and 2.11 mg / L, respectively.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703;X52
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