Pervaporation of ammonia solution with c-alumina supported organosilica membranes

Xing Yang, Lining Ding, Martin Wolf, Frans Velterop, Henny J.M. Bouwmeester, Simon Smart, João C. Diniz da Costa, Audra Liubinas, Jun-De Li, Jianhua Zhang, Mikel Duke*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

21 Citations (Scopus)
25 Downloads (Pure)


In this work, pervaporation of ammonia-solution using c-alumina supported organosilica membrane (HybSi , Pervatech) was explored to understand ammonia removal performance and material stability in this unique high pH environment. During the testing of synthetic ammonia solution of 50 mg/L at 45 C (pH 10), the hybrid silica membrane showed a preference towards ammonia transport over water, with an ammonia separation factor up to 12 and flux of 4.3 kg m 2 h 1 stable in a continuous testing period of 7 h. At an ammonia concentration of 1000 mg/L (pH 11), the membrane initially exhibited separation preference towards ammonia at 45 C, then gradually reversed to water selective after increasing to 70 C, where a significant flux decline was observed. The membrane degradation was investigated by FTIR, porosimetry, SEM and XRD. Only slight change in organosilica chemistry and structure was evident, however more significant degradation was observed in the supporting c-alumina layer. The changes in crystalline alumina structure, porous properties and physical structure undermined the functional silica separation layer. Therefore while the organosilica membrane appeared stable in the high pH aqueous ammonia environment, membranes for ammonia pervaporation applications should consider alternative supporting layers to c-alumina.
Original languageEnglish
Pages (from-to)141-151
JournalSeparation and purification technology
Publication statusPublished - 2016


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