title: Reactive sorption of mercury(II) on to poly(m-phenylenediamine) microparticles.
abstract: Poly(m-phenylenediamine) (PmPD) microparticles, from the monomer with two amino groups, were synthesized through chemical oxidation, and the strong adsorbability of mercury ions on to PmPD was systematically examined. The results revealed a rapid adsorption process with an equilibrium time of 30 minutes. Also, the adsorption behaviour showed that the adsorption kinetics was in good agreement with the pseudo-second-order equation. The maximum uptake capacity for mercury (Q(max)) reached approximately 955 mg g(-1) at 0.02 M NaNO3 and 25 degrees C, which decreased appreciably with the increasing of salt concentration. The amount of mercury sorbed at equilibrium steadily increased as the temperature rose from 25 to 45 degrees C, which can be indicative of an endothermic process. The pH value of the solution seemed to exhibit little influence on the adsorption capacity. The adsorption mechanisms, including Hg2+ complexation with nitrogen and ion exchange between Hg2+ and H+ on PmPD chains, are proposed on the basis of Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, PR China.
authors.forename: Rong
authors.initials: R
authors.lastname: Tang
authors.forename: Qin
authors.initials: Q
authors.lastname: Li
authors.forename: Liang
authors.initials: L
authors.lastname: Ding
authors.forename: Hao
authors.initials: H
authors.lastname: Cui
authors.forename: Jianping
authors.initials: J
authors.lastname: Zhai
mesh_terms: D000327:Adsorption; D004785:Environmental Pollutants / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008628:Mercury / Q000302:isolation & purification*; D009994:Osmolar Concentration; D010655:Phenylenediamines / Q000138:chemical synthesis*; D056951:Photoelectron Spectroscopy; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013816:Thermodynamics; D013997:Time Factors
chemical_list: D004785:Environmental Pollutants; D010655:Phenylenediamines; C435915:poly(1,3-phenylenediamine); D008628:Mercury