A pervaporation study of ammonia solutions using molecular sieve silica membranes

Yang, Xing, Fraser, Thomas, Myat, Darli, Smart, Simon, Zhang, Jianhua, Diniz da Costa, João C., Liubinas, Audra and Duke, Mikel (2014) A pervaporation study of ammonia solutions using molecular sieve silica membranes. Membranes, 4 1: 40-54. doi:10.3390/membranes4010040

Author Yang, Xing
Fraser, Thomas
Myat, Darli
Smart, Simon
Zhang, Jianhua
Diniz da Costa, João C.
Liubinas, Audra
Duke, Mikel
Title A pervaporation study of ammonia solutions using molecular sieve silica membranes
Journal name Membranes   Check publisher's open access policy
ISSN 2077-0375
Publication date 2014-02-17
Sub-type Article (original research)
DOI 10.3390/membranes4010040
Open Access Status DOI
Volume 4
Issue 1
Start page 40
End page 54
Total pages 15
Place of publication Basel, Switzerland
Publisher M D P I
Collection year 2015
Language eng
Formatted abstract
An innovative concept is proposed to recover ammonia from industrial wastewater using a molecular sieve silica membrane in pervaporation (PV), benchmarked against vacuum membrane distillation (VMD). Cobalt and iron doped molecular sieve silica-based ceramic membranes were evaluated based on the ammonia concentration factor downstream and long-term performance. A modified low-temperature membrane evaluation system was utilized, featuring the ability to capture and measure ammonia in the permeate. It was found that the silica membrane with confirmed molecular sieving features had higher water selectivity over ammonia. This was due to a size selectivity mechanism that favoured water, but blocked ammonia. However, a cobalt doped silica membrane previously treated with high temperature water solutions demonstrated extraordinary preference towards ammonia by achieving up to a 50,000 mg/L ammonia concentration (a reusable concentration level) measured in the permeate when fed with 800 mg/L of ammonia solution. This exceeded the concentration factor expected by the benchmark VMD process by four-fold, suspected to be due to the competitive adsorption of ammonia over water into the silica structure with pores now large enough to accommodate ammonia. However, this membrane showed a gradual decline in selectivity, suspected to be due to the degradation of the silica material/pore structure after several hours of operation.
Keyword Molecular sieve silica membrane
Vacuum membrane distillation
Ammonia removal
Competitive adsorption
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Special Issue "Selected Papers from AMS8 Conference (July 2013, Xi’an, China)".

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2015 Collection
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Citation counts: Scopus Citation Count Cited 2 times in Scopus Article | Citations
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Created: Mon, 24 Mar 2014, 15:21:25 EST by Mr Simon Smart on behalf of School of Chemical Engineering