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Approaching ratio as a guideline for substrate design of forward osmosis membranes | |
2024-02-01 | |
发表期刊 | JOURNAL OF MEMBRANE SCIENCE (IF:8.4[JCR-2023],8.1[5-Year]) |
ISSN | 0376-7388 |
EISSN | 1873-3123 |
卷号 | 693 |
发表状态 | 已发表 |
DOI | 10.1016/j.memsci.2023.122332 |
摘要 | Forward osmosis (FO) has been proposed as an ecologically friendly and low carbon footprint technology for concentrating enriched lithium brine from the salt lake using freely available MgCl2 onsite as the draw. In this process, Li+ concentration is raised from a few hundred mg/L to 20-30 g/L (Li+) before precipitation of Li2CO3. To allow FO technology a wide margin in competing with other concentration technologies, it is highly desirable to develop a simple, low cost method to fabricate FO membrane. Besides, due to both feed and draw solutions being of high salinity, FO membranes should also have a defect-free polyamide (PA) separation layer and a low structural parameter (S) substrate. This paper presents a simple guideline called approaching ratio (alpha) to adjust the substrate pore morphology based on a ternary polysulfone (PSf)/N,N-dimethylacetamide (DMAc)/diethylene glycol (DEG) solution. The alpha ranging between 0 and 100 % is a metric measuring how close the solution is to the cloud point. The increase of alpha endows instant phase separation, resulting in the substrate with increased surface porosity and sponge-like structure. Pore connectivity is improved following an increase of alpha below a threshold value of 50 %. Water permeability dramatically increases from alpha = 0 % to alpha = 50 % and declines at above 50 % for forming the closed cellular pores at alpha = 80 %. The FO water flux shows a similar trend which was found to be closely related to the substrate pore interconnectivity. The FO membrane was applied in the lithium concentration process using saturated MgCl2 as the draw, the experimental results fit well with the FO model. The results demonstrate a simple, low-cost generic method to prepare FO membranes for applications with very high salinity feed and draw. |
关键词 | Forward osmosis Structural parameter Approaching ratio Thin film composite Lithium extraction |
URL | 查看原文 |
收录类别 | SCI |
语种 | 英语 |
资助项目 | National Natural Science Foun-dation of China[ |
WOS研究方向 | Engineering ; Polymer Science |
WOS类目 | Engineering, Chemical ; Polymer Science |
WOS记录号 | WOS:001147883400001 |
出版者 | ELSEVIER |
引用统计 | 正在获取...
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文献类型 | 期刊论文 |
条目标识符 | https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/349877 |
专题 | 物质科学与技术学院 物质科学与技术学院_硕士生 物质科学与技术学院_博士生 |
通讯作者 | He, Tao |
作者单位 | 1.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China 2.Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai 201210, Peoples R China 3.Shenzhen Univ, Coll Chem & Environm Engn, Shenzhen 518060, Peoples R China |
第一作者单位 | 物质科学与技术学院 |
第一作者的第一单位 | 物质科学与技术学院 |
推荐引用方式 GB/T 7714 | Sun, Nan,Mo, Shucheng,Dou, Pengjia,et al. Approaching ratio as a guideline for substrate design of forward osmosis membranes[J]. JOURNAL OF MEMBRANE SCIENCE,2024,693. |
APA | Sun, Nan,Mo, Shucheng,Dou, Pengjia,Dong, Chenjun,&He, Tao.(2024).Approaching ratio as a guideline for substrate design of forward osmosis membranes.JOURNAL OF MEMBRANE SCIENCE,693. |
MLA | Sun, Nan,et al."Approaching ratio as a guideline for substrate design of forward osmosis membranes".JOURNAL OF MEMBRANE SCIENCE 693(2024). |
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