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])
ISSN0376-7388
EISSN1873-3123
卷号693
发表状态已发表
DOI10.1016/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
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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
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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
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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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