基于卟啉功能膜的制备及其对镉离子的检测

发布时间：2018-03-28 03:09

本文选题：膜　切入点：卟啉　出处：《天津工业大学》2017年硕士论文

【摘要】：卟啉因其特殊的化学结构和光电特性而被广泛地应用于生物、化学以及物理领域,本文利用TMPyP的带电性,分别将其负载在PSF-PNaSS和水解PAN膜表面,并根据TMPyP易与重金属离子配位的特性着重研究了PSF-PNaSS/TMPyP 和 PAN-TMPyP-(PAH-PSS)n功能膜对 Cd2+的检测效果。PSF-PNaSS/TMPyP功能膜在动态条件下对Cd2+的检测。由于TMPyP与Cd2+的可逆配位作用,功能膜表现出对水中Cd2+良好的富集作用,并通过光谱和表观颜色的变化,实现检测功能,同时具有很好的再生能力。研究表明,Cd2+初始溶液浓度越小,流速越小,功能膜吸附检测速率越缓慢;通过控制TMPyP负载量等条件,可实现对痕量Cd2+的富集与检测;与静态吸附检测过程相比,动态条件更有利于Cd2+的扩散及在膜表面的富集,镉离子浓度为0.01mg/L时,功能膜对镉离子的检测时间由静态时的6h减少到60分钟左右。通过层层自组装技术在PAN-TMPyP功能膜表面交替吸附带正电的聚电解质聚丙烯胺盐酸盐(PAH)和带负电的聚电解质对苯乙烯磺酸钠(PSS),从而使TMPyP在膜表面更加稳定,同时解决了聚砜/卟啉功能膜(PSF-PNaSS/TMPyP)上TMPyP分布不均匀、SI-ATRP法接枝率不好控制以及TMPyP在膜表面稳定性不好等缺点。研究表明PAN-TMPyP-(PAH-PSS)n功能膜对镉离子的检测和PSF-PNaSS/TMPyP功能膜相似:Cd2+进料液浓度越大、透过液流速越快、卟啉(TMPyP)负载量越小,功能膜吸附检测速率越快,与静态吸附检测过程相比,动态条件更有利于功能膜对Cd2+的检测,功能膜显示出更快的检测速度,镉离子浓度为0.001mg/L时,PAN-TMPyP-(PAH-PSS),功能膜对镉离子的检测时间由静态时的3h减少到100分钟左右。PAN-TMPyP-(PAH-PSS)n功能膜可以通过调节膜结构使功能膜对镉离子有截留作用,截留作用使进料液一侧镉离子的浓度大大提高,从而提高了功能膜对镉离子的检测速度,截留率为55%的PAN-TMPyP-(PAH-PSS)n功能膜检测1mg/L的镉离子溶液达到平衡需要75mL,而截留率为80%的PAN-TMPyP-(PAH-PSS)n功能膜检测1mg/L的镉离子溶液达到平衡需要25mL。
[Abstract]:Porphyrins are widely used in biological, chemical and physical fields because of their special chemical structure and photoelectric properties. In this paper, porphyrins are loaded on the surface of PSF-PNaSS and hydrolyzed PAN films respectively by using the charge property of TMPyP. According to the characteristics of TMPyP easy to coordinate with heavy metal ions, the detection effect of PSF-PNaSS/TMPyP and PAN-TMPyP-(PAH-PSS)n functional membrane on Cd2. PSF-PNASS / TMPyP functional membrane was used to detect Cd2 under dynamic conditions. Because of the reversible coordination between TMPyP and Cd2, The functional membrane showed a good enrichment effect on Cd2 in water, and the detection function was realized by changing the spectrum and apparent color. The results showed that the lower the initial concentration of CD _ 2, the lower the flow rate, and the better the regeneration ability was. By controlling the loading amount of TMPyP, trace Cd2 can be enriched and detected. Compared with static adsorption, the dynamic conditions are more favorable to the diffusion of Cd2 and the enrichment on the membrane surface. When the concentration of cadmium ion is 0.01mg/L, The detection time of cadmium ion by functional membrane was reduced from 6 h at static state to about 60 minutes. The polyelectrolyte polyelectrolyte polyacrylamide hydrochloride with positive charge and negative charge were adsorbed alternately on the surface of PAN-TMPyP functional membrane by layer by layer self-assembly technique. The hydrolysis of sodium styrenesulfonate (TMPyP) made TMPyP more stable on the surface of the membrane. At the same time, the defects such as poor grafting rate of TMPyP and poor stability of TMPyP on the surface of PSF-PNaSS / TMPyP-) were solved. The results showed that the concentration of CD _ 2 in PAN-TMPyP-(PAH-PSS)n functional membrane was higher than that in PSF-PNaSS/TMPyP functional membrane, which was similar to that of PSF-PNaSS/TMPyP functional membrane, and the grafted ratio of TMPyP on the surface of the membrane was not well controlled by SI-ATRP method, the results showed that the concentration of CD _ 2 was similar to the concentration of CD _ 2 in PAN-TMPyP-(PAH-PSS)n functional membrane. The faster the flow rate of permeation liquid, the smaller the loading of porphyrin monophosphate, and the faster the detection rate of functional membrane adsorption. Compared with the static adsorption detection process, the dynamic condition is more favorable to the detection of Cd2 by functional membrane, and the detection speed of functional membrane is faster than that of static adsorption detection process. When the concentration of cadmium ion is 0.001mg/L, the detection time of PAN-TMPyP-NPAH-PSSN can be reduced from 3h at static state to about 100min. PAN-TMPyP-PAH-PSSn functional membrane can intercept cadmium ion by adjusting the membrane structure. The concentration of cadmium ions on one side of the feed solution was greatly increased by interception, and the detection speed of cadmium ion was improved by the functional membrane. For PAN-TMPyP-(PAH-PSS)n functional membrane with a rejection rate of 55%, the CD ion solution of 1mg/L needs 75 mL to achieve equilibrium, while for 80% PAN-TMPyP-(PAH-PSS)n functional membrane to reach the equilibrium of CD ion solution in 1mg/L, 25 mL is required for the detection of CD ion solution in 1mg/L.
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ028.8

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