长周期光纤光栅铁离子浓度传感器的制备及其在MFC中的应用研究

发布时间：2018-01-07 18:36

本文关键词：长周期光纤光栅铁离子浓度传感器的制备及其在MFC中的应用研究　出处：《重庆理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：微生物燃料电池(MFC)是微生物将有机物中的化学能转换为电能的装置,也是解决环境污染、开发新型清洁能源的新技术。它在产电的同时还能用于废水处理、去除硫化氢、产氢和地下水修复等。与传统的废水处理工艺相比,MFC产泥量少、无甲烷产生,但产电功率密度低,影响MFC的发展,通常还比氢氧燃料电池少3-4个数量等级。为提高MFC的产电功率和废水处理及降低成本,本文系统地研究分析了MFC内参与生化反应过程的电极临近区域Fe3+的实时监测技术。光纤传感技术是以光纤光栅作为传感单元的新型传感器,本文采用静电层层自组装技术对LPFG的传感部位自组装高分子聚合物[]20/PAAPDDA敏感膜代替光纤包层,并在敏感膜中加入铁离子指示剂磺基水杨酸,通过分析敏感膜的厚度,指示剂的含量对传输光谱及传输光强的影响。响应测试了MFC阳极室内的Fe3+浓度,实验发现:(1)用光谱仪测试修饰了敏感膜的光纤传感器的传输光谱,发现光谱传输能力增强,且传感器吸收峰的最大吸光度与光纤表面的镀膜层数呈线性减弱关系,证实了镀膜过程分子是逐层交替沉积的。(2)用电镜扫描仪器对镀了[]20/PAAPDDA膜后的光纤表面进行微观观察,发现其外观形貌完整、表面均匀。可以用来作为Fe3+指示剂的载体。(3)添加了0.5%的磺基水杨酸指示剂后对不同浓度的铁离子溶液的光强变化基本呈线性关系。即该自组装敏感膜对液相状态下的铁离子具有较好的光学响应能力,能够作为实时监测MFC阳极界面基质不同组分的化合物含量变化的传感器。(4)用EDTA测试了光纤传感器的可重复使用性,发现加入脱附铁离子的EDTA后红移了2.54nm的光谱会再蓝移2.5nm回到原来的中心波长,说明光纤传感器与液相状态下的Fe3+反应形成了稳定的水溶性络合物,因此,此传LPFG-FBG感器能够重复多次使用。模拟MFC产电过程发生的生物化学反应使反应室内的温度和离子浓度发生改变,影响产电功率的同时也影响传感器检测的准确性。因此为了消除在测量过程中的温度交叉敏感,本文对消除温度的交叉敏感做了分析,将级联式的LPFG-FBG光纤光栅传感器用于同时测量温度和传感器外部环境介质的折射率。分别对FBG和LPFG的温度传感特性与外部环境折射率作了理论分析,并针对FBG对环境折射率不敏感的特点,将FBG与LPFG级联,组成对温度具有补偿功能的新型高敏感传感器。
[Abstract]:Microbial fuel cell (MFC) is the organic matter in microbial chemical energy into electrical energy device, but also solve the environmental pollution, the development of new technology of new clean energy. It can also be used in wastewater treatment, electric generation and removal of hydrogen sulfide, hydrogen production and groundwater remediation. Compared with the traditional wastewater treatment process. MFC produces less sludge, no methane production, but the power density is low, influence the development of MFC, usually less than a number of 3-4 fuel cell grade. In order to improve the production of MFC electric power and waste water treatment and reduce the cost, this paper systematically analyzes the research of real-time monitoring technology for electrode biochemical reaction process in MFC in the neighborhood of Fe3+. The optical fiber sensing technology is based on optical fiber grating as the sensor unit model, this paper adopts electrostatic layer by layer self assembly technology of LPFG sensor parts of self assembled polymer sensitive 20/PAAPDDA [] The sense of film instead of fiber cladding, and adding iron ion indicator sulfosalicylic acid in sensitive membrane, through the analysis of sensitive film thickness, the effect of indicator content on the transmission spectrum and transmission intensity. In response to the concentration of Fe3+, MFC anode chamber test experiment found that: (1) the spectrum analyzer modified fiber transmission spectrum the sensor sensitive membrane, showed enhanced spectral transmission ability, and the sensor absorption peak maximum absorbance and fiber surface coating layers decreased linearly relationship, confirmed the molecular deposition process is the deposition layer. (2) electric mirror scanning instrument for microscopic observation on the optical fiber surface plating []20/PAAPDDA film after the discovery the appearance of a complete, uniform surface. Can be used as a carrier of Fe3+ indicator. (3) added the sulfosalicylic acid indicator 0.5% after the change of light intensity on the iron ion solution of different concentration was the basic line That is the self assembling. The relation of the sensitive film with iron ions in liquid phase state and good optical response capability, sensor can change compounds content as different groups of real-time monitoring of MFC interface. The anode substrate (4) with the EDTA test of the fiber optic sensor can be used repeatedly, found that adding iron ions desorption the EDTA 2.54nm spectrum will shift back to the blue shift of center wavelength of the original 2.5nm, Fe3+ optical fiber sensor and the liquid phase under the condition of the formation of a stable water soluble complex, therefore, the LPFG-FBG sensor can be used repeatedly. The biological chemical reaction simulation MFC electricity production process occurs so that the temperature of the reaction chamber and the ion concentration changes, while the impact of electric power also affects the accuracy of sensors. In order to eliminate in the process of measurement of temperature cross sensitivity, the elimination of the cross temperature Sensitive analysis has been done, the LPFG-FBG fiber grating sensor cascade for simultaneous measurement of temperature and refractive index sensor external environment medium respectively. The rate of temperature sensing characteristics and the external environment of FBG index and the rate of LPFG is analyzed, and based on the FBG characteristics of the refractive index is not sensitive, FBG and LPFG cascade. The new high sensitive sensor with compensation function of the temperature.

【学位授予单位】：重庆理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM911.4;TP212

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