文章信息/Info

Title:

Effect of Inorganic Additives on the Performance of Sulfonated Heterocyclic Copoly(ether sulfone)s Composite Membranes

作者:

張守海; 王榛麟; 石婉玲; 劉乾; 蹇錫高

（大連理工大學化工學院，遼寧省高性能樹脂工程技術研究中心，遼寧省高分子科學與工程重點實驗室，遼寧 大連 116024）

Author(s):

ZHANG Shouhai;  WANG Zhenlin;  SHI Wanling;  LIU Qian;  JIAN Xigao

（Liaoning Key Laboratory of Polymer Science and Engineering, Liaoning High Performance Polymer Engineering Research Center, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China）

關鍵詞:

磺化雜萘聯苯聚芳醚砜; 復合膜; 納濾膜; 添加劑; 性能

Keywords:

Sulfonated copoly(phthalazinone biphenyl ether sulfone);  Composite membrane;  Nanofiltraion membrane;  Additive;  Performance

DOI:

10.7502/j.issn.1674-3962.2018.02.02

文獻標志碼:

A

摘要:

磺化聯苯型雜萘聯苯共聚醚砜為涂層材料，分別以氯化鋰、氯化鈉、氯化鉀為無機添加劑配制浸涂稀溶液，在聯苯型雜萘聯苯共聚醚砜超濾底膜上，采用涂覆方法制備磺化雜萘聯苯共聚醚砜復合納濾膜（SPPBES-LiCl、SPPBES-NaCl和SPPBES-KCl）。考察了無機添加劑對復合膜的分離性能的影響，復合膜對不同無機鹽的脫鹽率順序均為Na₂SO₄＞NaCl＞MgSO₄＞MgCl₂，表現出荷負電納濾膜的分離特征,以氯化鋰為添加劑所制備SPPBES-LiCl復合納濾膜的脫鹽率最高，而通量最小。考察了耐熱性能和耐氧化性能，當操作溫度從20 ℃升至95 ℃時，SPPBES-LiCl復合膜的通量由46 L·m^-2·h^-1增加到130 L·m^-2·h^-1，而脫除率下降約3%，相比于SPPBES-NaCl和SPPBES-KCl，SPPBES-LiCl復合膜分離性能隨操作溫度變化最小。在0.2 g·L^-1的NaClO溶液中浸泡8 d，SPPBES-LiCl復合膜通量增大2%左右，而SPPBES-NaCl與SPPBES-KCl的通量增幅小于8%；相比于SPPBES-NaCl和SPPBES-KCl膜，SPPBES-LiCl復合膜具有更好的耐氧化穩定性。磺化雜萘聯苯共聚醚砜復合納濾膜表現出了較好的耐酸堿穩定性。

Abstract:

Sulfonated copoly(phthalazinone biphenyl ether sulfone)(SPPBES) coating solution were prepared with SPPBES as material and LiCl, NaCl and KCl as inorganic salt additives. SPPBES composite nanofiltration membranes were prepared with copoly(phthalazinone biphenyl ether sulfone)(PPBES) as ultrafiltration support membranes via dip coating method. The composite nanofiltration membranes prepared with LiCl, NaCl and KCl as inorganic salt additives were named as SPPBES-LiCl, SPPBES-NaCl and SPPBES-KCl, respectively. The effect of inorganic salt additives on the performance of composite nanofiltration membrane was studied. The composite nanofiltration membranes showed the rejection of inorganic salt in the order of Na₂SO₄>NaCl>MgSO₄>MgCl₂, which show the characteristic of negatively charged nanofiltration membranes. The flux of composite membrane increased with the increase in the radii of metal ion of inorganic salt additives, while the salt removing rate of composite membrane decreased. SPPBES-LiCl composite membrane showed highest salt removing rate while SPPBES-KCl composite membrane exhibited highest flux among the three membranes. The thermal stability, chemical stability and oxidative stability of composite membranes were investigated in detail. When the operating temperature increased from 20 to 95 ?C, the flux of SPPBES-LiCl membrane increased from 46 to 130 L·m^-2·h^-1 while the salt removing rate of composite membrane decreased by 3%. Compared to SPPBES-NaCl and SPPBES-KCl membrane, SPPBES-LiCl membrane showed the least change on membrane performance with the increasing temperature. After composite membranes were immersed into 0.2 g·L^-1 NaClO solution for 8 days, the flux of SPPBES-LiCl composite membranes increased by 2% while the flux of SPPBES-NaCl membrane and SPPBES-KCl membrane increased about 8%. It was found that SPPBES composite membranes showed good high temperature resistance, excellent chemical stability and oxidation resistance. Besides, SPPBES-LiCl composite nanofiltration membrane showed better oxidative stability than SPPBES-NaCl membrane and SPPBES-KCl membrane. The effects of inorganic salt additive on morphology and hydrophilicity of composite membranes were investigated by SEM and contact angle. Composite membranes showed smooth surface and contact angle ranging from 55.5??to 58.6?, indicating that three kinds of composite membranes showed similar surface morphology and hydrophilicity.