Chem. Mater., 17 (22), 5411 -5419, 2005. 10.1021/cm050813s S0897-4756(05)00813-6 Web Release Date: October 4, 2005

Comment: Hiyam you may want to have a look at this paper. It appears to be similar to Shimizu's stuff.

Facile Synthesis and Highly Reactive Silver Ion Adsorption of Novel Microparticles of Sulfodiphenylamine and Diaminonaphthalene Copolymers
Xin-Gui Li,* Rui Liu, and Mei-Rong Huang*
Institute of Materials Chemistry, School of Materials Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China, and Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138
Received April 18, 2005
Revised Manuscript Received August 25, 2005

Abstract:
A series of novel copolymer microparticles from 4-sulfonic diphenylamine (SDP) and 1,8-diaminonaphthalene (DAN) was facilely prepared by a chemically oxidative polymerization. The structures and properties of the microparticles were systematically characterized by several important techniques. The microparticles exhibit good water resistance and high thermostability. Their electrical conductivity significantly rises after HCl doping or Ag adsorption. The Ag+ reactive adsorbability of the microparticles was optimized by carefully regulating the SDP/DAN ratio, particle size, and Ag+ solution pH. Both the introduction of SDP units into DAN polymer chains and the diminution of the particle size can effectively increase the capacity and rate of Ag+ adsorption. In particular, the Ag+ adsorbance on SDP/DAN (30/70) copolymer microparticles reaches 2.0 g g-1, which is the highest silver adsorption capacity reported thus far. A novel mechanism of Ag+ reactive adsorption on the microparticles containing a large number of reactive groups such as amino, imino, and sulfonic groups has been proposed. The microparticles could be very applicable to elimination and recovery of noble metallic ions in wastewater.