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|Title:||Mechanisms of lead adsorption on chitosan/PVA hydrogel beads|
|Citation:||Jin, L., Bai, R. (2002-12-10). Mechanisms of lead adsorption on chitosan/PVA hydrogel beads. Langmuir 18 (25) : 9765-9770. ScholarBank@NUS Repository.|
|Abstract:||Removal of lead from aqueous solution with chitosan/PVA (poly(vinyl alcohol)) hydrogel beads was studied in batch adsorption experiments at various solution pH values (2-7.6). Lead adsorption on chitosan/PVA beads was found to be strongly pH-dependent and displayed a maximum uptake capacity at pH around 4 and a minimum at pH about 6.4 ζ-Potential study indicated that chitosan/PVA beads possessed positive ζ-potentials at pH < 6.3 and negative ζ-potentials at pH > 6.3. Hence, adsorption occurred even though the interaction between lead and chitosan/PVA beads was electrostatically repulsive at pH < 6.3. Complexation, ion exchange, and electrostatic interaction are all believed to play a role in lead adsorption on chitosan/PVA beads, but the relative importance of each of these mechanisms varies with solution pH values. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy spectra suggested that lead adsorption was mainly through interactions with the N atoms in chitosan in the pH range studied.|
|Appears in Collections:||Staff Publications|
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