DOI: 10.1016/j.watres.2018.11.073
Scopus记录号: 2-s2.0-85058034939
论文题名: Dependence of initial silica scaling on the surface physicochemical properties of reverse osmosis membranes during bench-scale brackish water desalination
作者: Lu K.-G. ; Huang H.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 358
结束页码: 367
语种: 英语
英文关键词: Brackish water
; Membrane surface properties
; Reverse osmosis
; Silica scaling
Scopus关键词: Desalination
; Electrostatics
; Reverse osmosis
; Silica
; Surface properties
; Water filtration
; Brackish water
; Brackish water desalinations
; Competitive adsorption
; Electrostatic repulsion
; Logistic growth model
; Membrane surface properties
; Physicochemical property
; Silica scaling
; Osmosis membranes
; brackish water
; polyamide
; silanol
; silicon dioxide
; adsorption
; brackish water
; desalination
; growth modeling
; membrane
; physicochemical property
; reverse osmosis
; silica
; adsorption
; Article
; desalination
; membrane
; physical chemistry
; priority journal
; reverse osmosis
; static electricity
; surface property
英文摘要: Silica scaling of reverse osmosis membranes in brackish water desalination is less understood than hardness scaling due to the complex silica behaviors at the membrane/water interface. In this study, -COOH, -SO3H, -NH2 and -OH functional groups were introduced onto polyamide membranes to create distinct surface physicochemical properties. The resulting membranes were further studied under similar scaling conditions to yield temporal flux loss data that were empirically interpreted by a logistic growth model. The scaled membranes were also characterized by complementary analytical techniques. It was found that permeate flux loss was strongly correlated to the initial silica layer formed by direct interaction between reactive silanol (Si-OH) and reciprocal groups on the membrane surface, rather than the entire scaling layer. Importantly, membrane surface properties dictated the initial silica layer formation through three possible mechanisms, i.e., electrostatic repulsion, competitive adsorption, and interfacial energy change. Of these, electrostatic repulsion was identified as the primary one. Therefore, by modifying the membrane surface properties, the three aforementioned mechanisms may be enhanced to favor the formation of a loose, disordered initial silica scaling layer. Accordingly, membrane flux loss may be mitigated. This finding provided important insights into the design heuristics of scaling-resistant reverse osmosis membrane for brackish water desalination. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122083
Appears in Collections: 气候变化事实与影响
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作者单位: School of Environment, Beijing Normal University, No. 19, Xinjiekouwai StreetBeijing 100875, China; Department of Environmental Health and Engineering, Bloomberg School of Public Health, The John Hopkins University, 615 North Wolfe StreetMD 21205, United States
Recommended Citation:
Lu K.-G.,Huang H.. Dependence of initial silica scaling on the surface physicochemical properties of reverse osmosis membranes during bench-scale brackish water desalination[J]. Water Research,2019-01-01