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Preparation and performance of TFC-FO membranes prepared on different HMPA concentrations
Authors： HAN Xueli, SUN Na, WANG Duo, WANG Meng
Units： College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
KeyWords： forward osmosis; polyamide composite membrane; polar aprotic solvent; HMPA
ClassificationCode：TQ028.8
year,volume(issue):pagination： 2021, 41(1):16-23

Abstract：

 In order to improve the performance of the composite forward osmosis membrane, it mainly starts from the following two aspects, optimizing the porous support layer and changing the structure of the active separation layer, while the active separation layer plays an important role on properties of membrane. In this paper, as a polar aprotic solvent, hexamethyl phosphoramide (HMPA) was added to the aqueous solution during the interfacial polymerization process. A series of characterizations of polyamide composite forward osmosis membranes with different HMPA concentrations were performed to observe the effect of the aqueous phase additive HMPA on membrane performance. Results showed that the cross-linking degree of the polyamide increased first and then decreased with the increase of HMPA concentration, and achieved the top value at 2.0 wt%. The morphology of the membrane surface indicated that HMPA had an effect on the surface morphology of the membrane, and the skin layer thickness and surface roughness of the membrane increased gradually. What’s more, it can be found that the hydrophilicity of the membrane surface was influenced by its chemical structure and surface morphology. The results of water flux and reverse salt flux showed that the water flux of M2 (2.0 % HMPA addition) increased by about 60% compared with M0 (without HMPA) while with a lower salt water ratio under FO mode for 1 mol/L NaCl draw solution from a de-ionized water feed solution.

Funds：
国家自然科学基金项目（21576249）

AuthorIntro：
韩雪笠（1995-），女，山东滨州人，在读硕士，从事功能膜材料的制备研究，联系电话：0532-66786513.

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