Behaviours and mechanisms of nanofiltration membrane fouling by anionic polyacrylamide with different molecular weights in brackish wastewater desalination
Behaviours and mechanisms of nanofiltration membrane fouling by anionic polyacrylamide with different molecular weights in brackish wastewater desalination
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不同分子量阴离子聚丙烯酰胺在苦咸废水淡化中纳滤膜污染行为及机理
DOI：
10.1016/j.desal.2019.06.024
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发表时间：
2019-10
期刊：
影响因子：
9.9
通讯作者：
Liu Guicai
中科院分区：
文献类型：
--
作者：
Zhao Dongsheng;Song Jiyu;Xu Jun;Yu Shuili;Liu Junxia;Zhu Youbing;Gu Zhengyang;Liu Guicai
研究了阴离子聚丙烯酰胺(APAM)的相对分子质量(Mw)对微咸水脱盐纳滤膜污染行为的影响，并利用界面自由能和分子间相互作用阐明了其影响。污垢堆积(MIRR)与分子间最大粘附力(FAD，max)密切相关。对于相对分子质量为5,000,000 Da(500APAM)的APAm，分子链越长越容易发生纠缠，从而导致较大的FAD，最大FAD和膜之间的FAD，从而导致较大的镜面。相反，不可逆污垢阻力(RIRR)与界面自由能(ΔG)密切相关。500APAM-膜的ΔG高于50APAM-膜，这表明膜表面和500APAM分子的热力学体系更稳定，从而导致更高的RIRR。较高的ΔG和较大的FAD，最大为500APAM强化的镜面Rirrand导致了更严重的通量下降。此外，当存在时，钙离子与羧酸盐之间的强配位作用导致了APAM与膜之间的强烈吸引，导致两种APAM的通量进一步下降。
The effect of the molecular weight (MW) of anionic polyacrylamide (APAM) on the fouling behaviours of nanofiltration membranes in brackish wastewater desalination was investigated, and its implications were elucidated using the interfacial free energy and intermolecular interactions. The foulant accumulation (mirr) was closely related to the intermolecular maximum adhesion force (Fad, max). For APAM with a larger MW of 5,000,000 Da (500APAM), the longer molecular chains were more susceptible to entanglement and thus caused a larger Fad, maxbetween the APAM chains and membrane, leading to a larger mirrthan for APAM with a MW of 500,000 Da (50APAM). In contrast, the irreversible fouling resistance (Rirr) strongly correlated with the interfacial free energy (ΔG). The ΔG for the 500APAM–membrane was higher than that for the 50APAM–membrane, which indicates a more stable thermodynamic system of the membrane surface and 500APAM molecules and thus resulted in a higher Rirr. The higher ΔG and larger Fad, maxfor 500APAM intensified mirrand Rirrand resulted in more severe flux declines. In addition, the strong coordination between Ca2+, when present, and carboxylates led to the intense attraction between APAM and the membrane, resulting in further flux declines of both APAMs.
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影响因子：
1.7
作者：
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通讯作者：
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影响因子：
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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