FUNCTIONALIZED ELECTROSPUN POLYMER NANOFIBERS FOR TREATMENT OF WATER CONTAMINATED WITH URANIUM.
FUNCTIONALIZED ELECTROSPUN POLYMER NANOFIBERS FOR TREATMENT OF WATER CONTAMINATED WITH URANIUM.
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DOI：
10.1039/c9ew00834a
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发表时间：
2020-03-01
期刊：
影响因子：
--
通讯作者：
Cwiertny DM
中科院分区：
文献类型：
--
作者：
Johns A;Qian J;Carolan ME;Shaikh N;Peroutka A;Seeger A;Cerrato JM;Forbes TZ;Cwiertny DM
饮用水中的铀(U)污染往往影响到资源有限的社区，对U6+的处理提出了独特的技术挑战。在这里，我们开发了一套化学功能化聚合物(聚丙烯腈；PAN)纳米纤维，用于低压反应过滤去除U6+。将含氮或含磷(如磷酸)官能化的粘合剂(1-3wt.%)混合到用于静电纺丝的PAN溶胶凝胶中，得到功能化的纳米纤维毡。为了进行比较，我们还用胺肟(AO)基团对PAN纳米纤维进行了功能化处理，该基团因其在U6+吸收方面的特异性而广为人知。为了获得最佳的氮基(Aiquat®336或AQ)和含磷[十六烷基膦酸(HPDA)和双(2-乙基己基)磷酸]结合剂，我们探索了它们在各种pH值(pH 2-7)、U6+浓度(高达10μM)以及模拟使用点(POU)水处理系统中去除U6+的用途。正如在离子交换中使用季铵基团所预期的那样，含AQ的材料似乎通过静电相互作用来隔离U6+；虽然这些材料对U6+的吸收是有限的，但在中性附近，当带正电荷的N基团与带负电荷的U6+络合物结合时，这种吸收是最大的。相反，HDPA和HDEHP在代表矿山废水的酸性pH条件下表现最好，在那里铀酰阳离子的表面络合可能会驱动吸收。在所有pH值中，AO对U6+的络合效果最好，但在接近中性的pH值和较高的溶解U6+浓度(10μM)时，也可以通过表面沉淀吸收U6+。在使用死端过滤系统的模拟POU处理研究中，我们观察到AO-PAN系统中的铀去除对地下水中的常见共溶物(如硬度和碱度)不敏感。虽然还需要更多的研究，但我们的结果表明，只有80克(约0.2磅)。处理个人供水(污染程度是美国环保局U最高污染物水平的十倍)一年，将需要使用一种AO-PAN过滤材料。
Uranium (U) contamination of drinking water often affects communities with limited resources, presenting unique technology challenges for U6+ treatment. Here, we develop a suite of chemically functionalized polymer (polyacrylonitrile; PAN) nanofibers for low pressure reactive filtration applications for U6+ removal. Binding agents with either nitrogen-containing or phosphorous-based (e.g., phosphonic acid) functionalities were blended (at 1–3 wt.%) into PAN sol gels used for electrospinning, yielding functionalized nanofiber mats. For comparison, we also functionalized PAN nanofibers with amidoxime (AO) moieties, a group well-recognized for its specificity in U6+ uptake. For optimal N-based (Aliquat® 336 or Aq) and P-containing [hexadecylphosphonic acid (HPDA) and bis(2-ethylhexyl)phosphate (HDEHP)] binding agents, we then explored their use for U6+ removal across a range of pH values (pH 2–7), U6+ concentrations (up to 10 μM), and in flow through systems simulating point of use (POU) water treatment. As expected from the use of quaternary ammonium groups in ion exchange, Aq-containing materials appear to sequester U6+ by electrostatic interactions; while uptake by these materials is limited, it is greatest at circumneutral pH where positively charged N groups bind negatively charged U6+ complexes. In contrast, HDPA and HDEHP perform best at acidic pH representative of mine drainage, where surface complexation of the uranyl cation likely drives uptake. Complexation by AO exhibited the best performance across all pH values, although U6+ uptake via surface precipitation may also occur near circumneutral pH value and at high (10 μM) dissolved U6+ concentrations. In simulated POU treatment studies using a dead-end filtration system, we observed U removal in AO-PAN systems that is insensitive to common co-solutes in groundwater (e.g., hardness and alkalinity). While more research is needed, our results suggest that only 80 g (about 0.2 lbs.) of AO-PAN filter material would be needed to treat an individual’s water supply (contaminated at ten-times the U.S. EPA Maximum Contaminant Level for U) for one year.
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DOI：
10.1039/dt9860001983
发表时间：
1986-09-01
期刊：
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
影响因子：
--
作者：
HIROTSU, T;KATOH, S;ITAGAKI, T
通讯作者：
ITAGAKI, T
影响因子：
12.8
作者：
Greenstein, Katherine E.;Myung, Nosang V.;Cwiertny, David M.
通讯作者：
Cwiertny, David M.
影响因子：
1.2
作者：
Fujiwara, K;Yamana, H;Moriyama, H
通讯作者：
Moriyama, H
影响因子：
6.7
作者：
Hoover J;Gonzales M;Shuey C;Barney Y;Lewis J
通讯作者：
Lewis J
影响因子：
1.9
作者：
Kamp, Susan D.;Morrison, Stan J.
通讯作者：
Morrison, Stan J.