Water purification performance and energy consumption of gradient nanocomposite membranes
Water purification performance and energy consumption of gradient nanocomposite membranes
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DOI：
10.1016/j.compositesb.2020.108426
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发表时间：
2020-12-01
影响因子：
13.1
通讯作者：
Wang, Shiren
中科院分区：
文献类型：
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作者：
Liu, Yuchen;Zhang, Zimeng;Wang, Shiren
反渗透(RO)膜法海水淡化技术占全球海水淡化装置装机容量的2/3，但能耗高，膜过滤工艺能耗约占总能耗的71%。在本研究中，设计并组装了氧化石墨烯和纤维素层压板的梯度膜，用于反渗透海水淡化。水的流动路径通过氧化石墨烯的尺寸来调节，而水/水的分离则通过氧化石墨烯的层间交联来调节。当氧化石墨烯的横向尺寸减小到300 nm时，梯度纳米复合膜的水产率达到21.34h(-1)m(-2bar)bar(-1)，盐截留率为96.08%，是目前商品化反渗透膜的5倍。此外，这种梯度纳米复合膜在膜过滤过程中也节省了35.8%的能源。此外，梯度纳米孔结构还表现出良好的可扩展性和长期稳定性。
Reverse Osmosis (RO) membrane-based desalination technology accounts for 2/3 water desalination installation capacity all over the world but suffers from intensive energy consumption, where the membrane filtration process accounts for similar to 71% of total energy consumption. In this research, gradient membranes were designed and assembled with graphene oxide and celluloses laminates, and then used for RO desalination. The water flowing path was tuned by graphene oxide sizes while salt/water separation was tailored by the graphene oxide interlayer crosslinking. The resultant gradient nanocomposite membranes demonstrated a water yield as high as 21.34 L h(-1)m(-2) bar(-1) with a salt rejection rate of 96.08% when the graphene oxide lateral size was reduced to 300nm, and such a yield was 5 times higher than that of current commercial RO membranes. In addition, such a gradient nanocomposite membrane also resulted in a 35.8% energy-saving in the membrane filtration process. Furthermore, the gradient nanoporous structure also exhibits decent scalability and long-time stability.