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首页> 美国卫生研究院文献>Membranes >A New Method for a Polyethersulfone-Based Dopamine-Graphene (xGnP-DA/PES) Nanocomposite Membrane in Low/Ultra-Low Pressure Reverse Osmosis (L/ULPRO) Desalination
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A New Method for a Polyethersulfone-Based Dopamine-Graphene (xGnP-DA/PES) Nanocomposite Membrane in Low/Ultra-Low Pressure Reverse Osmosis (L/ULPRO) Desalination

机译：一种新的基于聚醚砜的多巴胺 - 石墨烯（XGNP-DA / PE）纳米复合膜低/超低压力反渗透（L / ULPRO）脱盐

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摘要

Herein we present a two-stage phase inversion method for the preparation of nanocomposite membranes for application in ultra-low-pressure reverse osmosis (ULPRO). The membranes containing DA-stabilized xGnP (xGnP-DA-) were then prepared via dry phase inversion at room temperature, varying the drying time, followed by quenching in water. The membranes were characterized for chemical changes utilizing attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS). The results indicated the presence of new chemical species and thus, the inclusion of xGnP-DA in the polyethersulfone (PES) membrane matrix. Atomic force microscopy (AFM) showed increasing surface roughness (Ra) with increased drying time. Scanning electron microscopy (SEM) revealed the cross-sectional morphology of the membranes. Water uptake, porosity and pore size were observed to decrease due to this new synthetic approach. Salt rejection using simulated seawater (containing Na, K, Ca, and Mg salts) was found to be up to stable at <99.99% between 1–8 bars operating pressure. After ten fouling and cleaning cycles, flux recoveries of <99.5% were recorded, while the salt rejection was <99.95%. As such, ULPRO membranes can be successfully prepared through altered phase inversion and used for successful desalination of seawater.
机译：在此，我们提出了一种用于制备纳米复合膜的两级相位转化方法，用于在超低压力反渗透（ULPRO）中。然后通过在室温下通过干相反应制备含有Da稳定的XGNP（XGNP-DA-）的膜，改变干燥时间，然后在水中淬火。利用减毒的总反射率 - 傅里叶变换红外光谱（ATR-FTIR）和X射线光电子能谱（XPS），表征膜的特征在于化学变化。结果表明存在新的化学物质，从而纳入聚醚砜（PES）膜基质中的XGNP-DA。原子力显微镜（AFM）显示出增加表面粗糙度（RA），随着干燥时间增加。扫描电子显微镜（SEM）显示膜的横截面形态。由于这种新的合成方法，观察到采水，孔隙率和孔径尺寸减少。发现使用模拟海水（含Na，K，Ca和Mg盐）的盐排斥在1-8巴的操作压力之间的<99.99％稳定上。经过十个污垢和清洁循环后，记录助焊剂回收率<99.5％，而盐排斥量为<99.95％。这样，可以通过改变的相倒置成功制备ULPRO膜，并用于成功海水脱淀粉。

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