A SAPO-5-coated membrane for nanofiltration of tetraalkyl Ammonium hydroxide (cas 1336-21-6)
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Add time:09/07/2019 Source:sciencedirect.com
Nanofiltration of tetraalkyl ammonium hydroxide (TAAH) was investigated with a membrane coated with SAPO-5, a silicoaluminophosphate with a 12-member ring channel. The SAPO-5-coated membrane was prepared on an α-alumina support by a secondary growth method. Rejection of TAAH by the SAPO-5-coated membrane increased with the molecular size of the TAAH, because of the molecular sieve mechanism imparted by the SAPO-5 coating. However, the rejection decreased with increasing operational pressure because of concentration polarization near the membrane surface. The SAPO-5-coated membrane could be repeatedly used for nanofiltration, after backwashing with a dilute hydrochloric solution between cycles.
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