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首页> 外文期刊>Water Research >Graphene oxide based ultrafiltration membranes for photocatalytic degradation of organic pollutants in salty water
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Graphene oxide based ultrafiltration membranes for photocatalytic degradation of organic pollutants in salty water

机译：氧化石墨烯基超滤膜用于光催化降解盐水中的有机污染物

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Flat sheet ultrafiltration (UF) membranes with photocatalytic properties were prepared with lab-made TiO2 and graphene oxide-TiO2 (GOT), and also with a reference TiO2 photocatalyst from Evonik (P25). These membranes were tested in continuous operation mode for the degradation and mineralization of a pharmaceutical compound, diphenhydramine (DP), and an organic dye, methyl orange (MO), under both near-LIVNis and visible light irradiation. The effect of NaCl was investigated considering simulated brackish water (NaCl 0.5 g L-1) and simulated seawater (NaCl 35 g L-1). The results indicated that the membranes prepared with the GOT composite (M-GOT) exhibited the highest photocatalytic activity, outperforming those prepared with bare TiO2 (M-TiO2) and P25 (M-P25), both inactive under visible light illumination. The best performance of M-GOT may be due to the lower band-gap energy (2.9 eV) of GOT. In general, the permeate flux was also higher for M-GOT probably due to a combined effect of its highest photocatalytic activity, highest hydrophilicity (contact angles of 11 degrees, 17 degrees and 18 degrees for M-GOT, M-TiO2 and M-P25, respectively) and higher porosity (71%). The presence of NaCl had a detrimental effect on the efficiency of the membranes, since chloride anions can act as hole and hydroxyl radical scavengers, but it did not affect the catalytic stability of these membranes. A hierarchically ordered membrane was also prepared by intercalating a freestanding GO membrane in the structure of the M-GOT membrane (M-GO/GOT). The results showed considerably higher pollutant removal in darkness and good photocatalytic activity under near-LTVNis and visible light irradiation in continuous mode experiments. (c) 2015 Elsevier Ltd. All rights reserved.
机译：使用实验室制造的TiO2和氧化石墨烯-TiO2（GOT）以及赢创的参比TiO2光催化剂（P25）制备具有光催化性能的平板超滤（UF）膜。在近LIVNis和可见光照射下，以连续操作模式测试了这些膜的降解和矿化作用，以实现药物化合物苯海拉明（DP）和有机染料甲基橙（MO）的降解和矿化。考虑模拟咸水（NaCl 0.5 g L-1）和模拟海水（NaCl 35 g L-1），研究了NaCl的影响。结果表明，用GOT复合材料（M-GOT）制备的膜表现出最高的光催化活性，胜过用裸露的TiO2（M-TiO2）和P25（M-P25）制备的膜，它们在可见光照射下均无活性。 M-GOT的最佳性能可能是由于GOT的带隙能量较低（2.9 eV）。通常，M-GOT的渗透通量也较高，这可能是由于其最高的光催化活性，最高的亲水性（M-GOT，M-TiO2和M-GOT的接触角分别为11度，17度和18度）共同作用的结果。 P25）和较高的孔隙率（71％）。 NaCl的存在对膜的效率有不利影响，因为氯化物阴离子可以充当空穴和羟基自由基的清除剂，但不会影响这些膜的催化稳定性。还通过在M-GOT膜（M-GO / GOT）的结构中插入独立的GO膜来制备分层的膜。结果表明，在连续模式实验中，在近LTVNis和可见光照射下，在黑暗中的污染物去除率更高，并且具有良好的光催化活性。 （c）2015 Elsevier Ltd.保留所有权利。

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