Abstract
An amphoteric chitosan derivative, containing carboxymethyl (-COOH) groups and amine (-NH2) groups, had been prepared. FT-IR spectra confirmed the presence of γsymCOO (1408 cm-1) and γasCOO (1584 cm-1) on the structural units of the chitosan derivative, and 13C NMR spectra revealed that carboxy methylation reactions took place not only on the -OH but also on the -NH2. N, O-carboxymethyl chitosan (CM-CS)/ poly(ethersulfone) (PES) composite microfiltration (MF) membranes were prepared by immersing PES MF membranes into CM-CS solutions and cross-linking with glutaraldehyde. Streaming potential measurements indicate that the CM-CS/PES composite MF membranes possess a weaker positively charged characteristic at low pHs but a stronger negative charged characteristic at high pHs than the chitosan composite membrane (CS/PES). It was further observed that the CM-CS/PES composite membranes have higher adsorption capacities of bovine serum albumin (BSA) than the CS/PES composite membranes and PES membrane at lower pH 3.0-4.7, and lower adsorption capacities at higher pH 6.0-8.0. Therefore, the CM-CS/PES composite membranes may be suitable for resistant to protein fouling at high pHs or protein adsorption separations at low pHs applications.
Original language | English |
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Pages (from-to) | 35-39 |
Number of pages | 5 |
Journal | Desalination |
Volume | 144 |
Issue number | 1-3 |
DOIs | |
Publication status | Published - 10 Sept 2002 |
Externally published | Yes |
Keywords
- Carboxymethyl chitosan
- Composite membranes
- Fouling
- Poly(ethersulfone)
- Protein adsorption
- Zeta potential