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Rapid and Effective Adsorption of Lead Ions on Fine Poly(phenylenediamine) Microparticles
Author(s) -
Huang MeiRong,
Peng QianYun,
Li XinGui
Publication year - 2006
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200501070
Subject(s) - adsorption , ion , chemistry , aqueous solution , langmuir adsorption model , kinetics , polymerization , microparticle , precipitation , inorganic chemistry , chemical engineering , polymer , organic chemistry , physics , quantum mechanics , meteorology , engineering
Fine microparticles of poly( p ‐phenylenediamine) (P p PD) and poly( m ‐phenylenediamine) (P m PD) were directly synthesized by a facile oxidative precipitation polymerization and their strong ability to adsorb lead ions from aqueous solution was examined. It was found that the degree of adsorption of the lead ions depends on the pH, concentration, and temperature of the lead ion solution, as well as the contact time and microparticle dose. The adsorption data fit the Langmuir isotherm and the process obeyed pseudo‐second‐order kinetics. According to the Langmuir equation, the maximum adsorption capacities of lead ions onto P p PD and P m PD microparticles at 30 °C are 253.2 and 242.7 mg g −1 , respectively. The highest adsorptivity of lead ions is up to 99.8 %. The adsorption is very rapid with a loading half‐time of only 2 min as well as initial adsorption rates of 95.24 and 83.06 mg g −1 min −1 on P p PD and P m PD particles, respectively. A series of batch experiment results showed that the P p PD microparticles possess an even stronger capability to adsorb lead ions than the P m PD microparticles, but the P m PD microparticles, with a more‐quinoid‐like structure, show a stronger dependence of lead‐ion adsorption on the pH and temperature of the lead‐ion solution. A possible adsorption mechanism through complexation between Pb 2+ ions and N groups on the macromolecular chains has been proposed. The powerful lead‐ion adsorption on the microparticles makes them promising adsorbents for wastewater cleanup.