平板偏高岭土陶瓷膜用于直接接触膜蒸馏海水淡化

IF 2.3 Q2 Environmental Science
Tsegahun Mekonnen Zewdie, N. Habtu, A. Dutta, B. Van der Bruggen
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引用次数: 0

摘要

采用相转化和烧结技术制备了偏高岭土基疏水平板膜,并采用1H,1H,2H,2H-全氟辛基三乙氧基硅烷接枝剂对其进行了改性。采用XRD、FTIR、SEM、接触角、孔隙率、机械强度等方法对制备的膜进行了表征。结果表明,制备的膜的润湿性、结构和力学性能证实了该材料适合膜蒸馏(MD)的应用。经表面改性制备的偏高岭土基平板膜具有疏水性,水接触角为113.2°~ 143.3°。随后,采用直接接触膜蒸馏(DCMD)测试了不同氯化钠水溶液(合成海水)和不同操作参数(进料温度、进料流量)下的膜性能。实验结果表明,在偏高岭土掺量为45 wt.%、烧结温度为1300℃时,制备的膜在80℃、35 g/L、60 L/h的进料温度下,滤盐率为>95%,渗透通量为6.58±0.3 L/m2·h。因此,需要进一步优化膜的孔隙度、力学性能和表面性能,以最大限度地提高渗透通量和阻盐性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Flat sheet metakaolin ceramic membrane for water desalination via direct contact membrane distillation
Hydrophobic metakaolin-based flat sheet membrane was developed via phase inversion and sintering technique and modified through 1H,1H,2H,2H-perfluorooctyltriethoxysilane grafting agents. The prepared membrane was characterized by different techniques such as XRD, FTIR, SEM, contact angle, porosity, and mechanical strength. Their results indicated that the wettability, structural, and mechanical properties of the prepared membrane confirm the suitability of the material for membrane distillation (MD) application. The prepared metakaolin-based flat sheet membrane acquired hydrophobic properties after surface modification with the water contact angle values of 113.2° to 143.3°. Afterward, the membrane performance was tested for different sodium chloride aqueous solutions (synthetic seawater) and various operating parameters (feed temperature, feed flow rate) using direct contact membrane distillation (DCMD). Based on the findings, the prepared membrane at metakaolin loading of 45 wt.% and sintered at 1,300 °C was achieved the best performance with >95% salt rejection and permeate flux of 6.58 ± 0.3 L/m2 · h at feed temperature of 80 °C, feed concentration of 35 g/L, and feed flow rate of 60 L/h. It can be concluded that further optimization of membrane porosity, mechanical, and surface properties is required to maximize the permeate flux and salt rejection.
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来源期刊
Journal of Water Reuse and Desalination
Journal of Water Reuse and Desalination ENGINEERING, ENVIRONMENTAL-WATER RESOURCES
CiteScore
4.30
自引率
0.00%
发文量
23
审稿时长
16 weeks
期刊介绍: Journal of Water Reuse and Desalination publishes refereed review articles, theoretical and experimental research papers, new findings and issues of unplanned and planned reuse. The journal welcomes contributions from developing and developed countries.
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