Abdul Latif Ahmad, Boon Seng Ooi and Jyoti Prosad Choudhury

pp. 807 - 814

Abstract

Thin Film Composite (TFC) polyamide membranes were prepared by interfacially polymerizing
secondary amide (piperazine) and highly hydrophilic aromatic primary amide (3,5-diaminobenzoic acid)
with trimesoyl chloride onto the polysulfone support. The salt rejection and flux of these composite membranes were measured at various feed pressures. Incorporation of the 3,5-diaminobenzoic acid cause an
increase in hydraulic permeance and flux but loss in the rejection of NaCl and Na₂
SO₄
. Higher concentration
of 3,5-diaminobenzoic acid produced a loose and defected skin layer but small quantity of 3,5-diaminobenzoic acid can improved the flux and rejection of Na₂
SO₄
. The reaction between the 3,5-diaminobenzoic acid,
piperazine and trimesoyl chloride was further confirmed using Fourier Transform Infrared (FTIR).

Keywords

• 3;5-Diaminobenzoic acid
• piperazine
• interfacial polymerization