Tailoring the Separation Behavior of Polymer-Supported Organosilica Layered-Hybrid Membranes via Facile Post-Treatment Using HCl and HN<sub>3</sub> Vapors
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- Genghao Gong
- Department of Chemical Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
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- Hiroki Nagasawa
- Department of Chemical Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
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- Masakoto Kanezashi
- Department of Chemical Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
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- Toshinori Tsuru
- Department of Chemical Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
書誌事項
- 公開日
- 2016-04-20
- 資源種別
- journal article
- DOI
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- 10.1021/acsami.6b01986
- 公開者
- American Chemical Society (ACS)
この論文をさがす
説明
A promising layered-hybrid membrane consisting of a microporous organosilica active layer deposited onto a porous polymer support was prepared via a facile sol-gel spin-coating process. Subsequently, the pore sizes and structures of the organosilica top layers on the membrane surface were tuned at mild temperature combined with vapor treatment from either hydrochloric acid (HVT) or ammonia (AVT), thereby tailoring the desalination performance of the membranes during reverse osmosis (RO) processing. The effects of HVT and AVT on the pore size, structure, and morphology of organosilica layers and on the separation performances of membranes were investigated in detail. We confirmed that both HVT and AVT processes accelerated the condensation of silanol (Si-OH) in the organosilica layer, which led to dense silica networks. The layered-hybrid membranes after HVT showed an improved salt rejection and reduced water flux, while membranes after AVT exhibited a decrease in both salt rejection and water permeability. We found that HVT gave rise to smoother and denser organosilica layers, while AVT produced large voids and formed pinholes due to Ostwald ripening. These conclusions were supported by a comparative analysis of the results obtained via FTIR, TG-MS, SPM, and RO desalination.
収録刊行物
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- ACS Applied Materials & Interfaces
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ACS Applied Materials & Interfaces 8 (17), 11060-11069, 2016-04-20
American Chemical Society (ACS)
