文章摘要
聚砜/卟啉功能膜对镉离子的动态富集与检测
Dynamic Preconcentration and Detection of Polysulfone/Porphyrin Functional Membrane for Cadmium Ion
  
DOI:10.16865/j.cnki.1000-7555.2017.11.024
中文关键词:   卟啉  重金属离子  吸附  检测
英文关键词: membrane  porphyrin  heavy metal ions  adsorption  detection
基金项目:国家自然科学基金资助项目(51173132, 21676201, 51503146, 21204064);长江学者和创新团队发展计划(IRT13084);天津市应用基础与前沿技术研究计划 (14JCQNJC03900, 15JCZDJC37600)
作者单位
李森森1,2, 赵莉芝1,2, 常延姣1,2, 张玉忠1,2, 赵 帅1,2 1. 天津工业大学 省部共建分离膜与膜过程国家重点实验室2. 天津工业大学 材料科学与工程学院天津 300387 
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中文摘要:
      针对水体镉离子(Cd2+)的检测需求,将卟啉与膜技术结合制备传感膜,并研究其对Cd2+的动态富集与检测性能。将聚砜(PSF)基膜表面接枝聚对苯乙烯磺酸钠(PNaSS)分子刷,通过静电作用负载光学指示剂5,10,15,20-四(1-甲基-4吡啶基)卟啉(TMPyP),获得聚砜/卟啉功能膜。在动态条件下,由于TMPyP与Cd2+的可逆配位作用,功能膜表现出对水中Cd2+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,可实现对超痕量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,使功能膜显示出更快的检测速度。
英文摘要:
      In this paper, the preparation of sensor membrane and preconcentration and detection of cadmium ions (Cd2+) was implemented by combining porphyrin and membrane technology. The polysulfone/porphyrin functional membrane was prepared by loading 5,10,15,20-tetrakis(4-N-methylpyridyl)porphyrin p-toluenesulfonate (TMPyP) on the surface of polysulfone (PSF) membrane which was modified with poly(sodium p-styrenesulfonate) (PNaSS) brushes. Under the dynamic condition, the functional membrane shows good preconcentration property for Cd2+ due to the coordination interaction between TMPyP and Cd2+. The spectral and the apparent color changes enable the detection function of the membrane and the reversible coordination endows the membrane with good regeneration ability. Lower initial concentration of Cd2+ solution and lower flow rate lead to lower absorption and detection rate of the functional membrane. The preconcentration and detection for ultratrace Cd2+ can be achieved by controlling the capacity of TMPyP. Compared with the static adsorption, the function membrane shows faster detection for Cd2+ under the dynamic condition which favor the diffusion and adsorption of Cd2+ on the membrane surface.
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