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首页> 外文期刊>Advanced Functional Materials >Fouling Characteristics and Electrochemical Recovery of Carbon Nanotube Membranes
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Fouling Characteristics and Electrochemical Recovery of Carbon Nanotube Membranes

机译：碳纳米管膜的结垢特性及电化学回收

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摘要

The fouling behavior of carbon nanotube (CNT) membranes is investigated for large protein biomolecules and a wide variety of small molecules. The CNT membranes are largely fouling resistant, even to untreated river water, due to size exclusion and an inert graphitic core that supports fast fluid flow. However, it is found that bovine serum albumin (BSA) and naphthalene significantly foul membranes due to solution coagulation and π-π stacking, respectively. Small single-walled (SW) CNTs (<1.5 nm i.d.) are difficult to foul with BSA when precipitation is prevented, showing that size exclusion at SWCNT tips can prevent fouling. Electrochemical oxidation, bubble generation and ionic pumping are shown to recover membrane performance. Electrochemical oxidation at greater than +1.4 V is seen to oxidize CNTs as well as biofoulants, but H2 bubble generation at -2 V lifts foulants without damage to the membrane allowing for repeated cycles. Ionic pumping using large cations is seen to remove small molecule foulants adsorbed to the CNT core. The relatively narrow class of foulants and three complementary methods of membrane defouling make the CNT membrane platform a potentially robust system for a wide variety of chemical separations and environmental water treatments.
机译：研究了碳纳米管（CNT）膜对大型蛋白质生物分子和各种小分子的结垢行为。由于尺寸排阻和支持快速流体流动的惰性石墨芯，即使对于未经处理的河水，CNT膜也具有很大的抗污性。但是，发现牛血清白蛋白（BSA）和萘分别由于溶液凝结和π-π堆积而严重污染膜。当防止沉淀时，小的单壁（SW）CNT（i.d.小于1.5 nm）很难被BSA污染，这表明SWCNT尖端的尺寸排阻可以防止污染。电化学氧化，气泡产生和离子泵送可恢复膜性能。大于+1.4 V的电化学氧化被认为会氧化CNT和生物污垢，但是在-2 V处产生的H2气泡可提起污垢而不会损坏膜，允许重复循环。可以看出，使用大阳离子进行离子泵送可去除吸附在CNT芯上的小分子污垢。相对较窄的污垢类别和三种互补的膜除垢方法使CNT膜平台成为用于各种化学分离和环境水处理的潜在耐用系统。

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  • 来源
    《Advanced Functional Materials》 |2013年第12期|1500-1506|共7页
  • 作者

    Xinghua Sun; Ji Wu; Zhiqiang Chen; Xin Su; Bruce J. Hinds;

  • 作者单位

    Department of Chemical and Materials Engineering University of Kentucky Lexington, KY 40506, USA Department of Bioengineering University of Louisville, KY 40292, USA;

    Department of Chemical and Materials Engineering University of Kentucky Lexington, KY 40506, USA Department of Chemistry, Georgia Southern University, GA 30460, USA;

    Department of Chemical and Materials Engineering University of Kentucky Lexington, KY 40506, USA;

    Department of Chemical and Materials Engineering University of Kentucky Lexington, KY 40506, USA;

    Department of Chemical and Materials Engineering University of Kentucky Lexington, KY 40506, USA;

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