Facile synthesis of poly(1,8-diaminonaphthalene) microparticles with a very high silver-ion adsorbability by a chemical oxidative polymerization

Journal Article · Mon Oct 18 04:00:00 EDT 2004 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2004.07.042· OSTI ID:20634793

Xingui, Li ^[1]; Meirong, Huang ^[2]; Shengxian, Li ^[2]

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1. Laboratory of Concrete Materials Research, Institute of Materials Chemistry, College 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, MA 02138 (United States) and Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai 200433 (China)
2. Laboratory of Concrete Materials Research, Institute of Materials Chemistry, College of Materials Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092 (China)

Poly(1,8-diaminonaphthalene) (PDAN) was traditionally synthesized by an electrochemical polymerization that has some limitations such as low productivity and single form of a film. Here we report a relatively large mass synthesis of PDAN micrometer particles by a chemical oxidation of 1,8-diaminonaphthalene by (NH{sub 4}){sub 2}S{sub 2}O{sub 8} or FeCl{sub 3} with high yield. Elemental analysis, IR, and solid-state high-resolution {sup 13}C NMR spectroscopies indicate that the PDAN chain contains imine (-N=C), amine (-NH-C), and free amine (-NH{sub 2}) units as linkages between naphthalene rings. A double-stranded ladder or single-stranded structure via the linkages is deduced. The structure and Ag{sup +} absorbability of PDAN particles were characterized by laser particle-size analyzer, wide-angle X-ray diffractometer, IR, and inductively coupled plasma techniques. The Ag{sup +} adsorbability of the particles was examined and optimized systematically by varying the adsorption time, the dose and size of the particles, the temperature, pH, and concentration of Ag{sup +} solution. The fine particles obtained using (NH{sub 4}){sub 2}S{sub 2}O{sub 8} exhibit high adsorbability by complexation between Ag{sup +} and amine/imine groups as well as the redox between Ag{sup +} and free -NH{sub 2} group. The Ag{sup +} adsorbance reaches 1.92 g/g (PDAN) with exposure to a solution containing 82 mM Ag{sup +} ion for 24 h at an initial Ag{sup +}/PDAN ratio of 103 mmol/g. Total Ag{sup +} adsorbance was 1.92 times the PDAN weight, remarkably surpassing the largest Ag{sup +} adsorbance of 1.36 g/g (the best activated carbon fiber) for 30 days. The PDAN particles could be very useful in collection and removal of heavy metallic ions from water effluents.

• OSTI ID: 20634793
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 18 Vol. 52; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADSORPTION
AMINES
IRON CHLORIDES
NAPHTHALENE
NUCLEAR MAGNETIC RESONANCE
PARTICLE SIZE
POLYMERIZATION
SILVER
SILVER IONS
SOLUTIONS
SPECTROSCOPY
SYNTHESIS
X-RAY DIFFRACTION