Bipyridine containing poly(amic-acid)s: Synthesis, characterization, and sorption behavior toward the Ni (II) ions

New poly(amic-acid)s sorbents, bearing bipyridine chelating groups, were synthesized by reaction of benzophenonetetracarboxylic dianhydride (BTDA) with different percentages of 4,6-bis(4-aminophenyl)-2,2'-bipyridine (BAPB), and 1,4-phenylene diamine (PPD) and were characterized by FTIR and (HNMR)-H-1 spectroscopies. Because of the imidization of these poly(amic-acid)s after about 10% weight loss, their thermal stability was raised to about 500 degrees C. The glass transition temperatures of these polymers were in the range of 154-166 degrees C. The sorption of Ni(II) by these sorbents from the aqueous solutions was investigated by varying different parameters such as the contact time, pH, and sorbent dosage. Results indicated that the optimum efficiencies of these sorbents toward Ni(II) were at 25 degrees C, at pH = 4 and after about 75 min. According to the Langmuir equation, the maximum uptake capacity (q(m)) of PAA30/70 as a best sorbent for nickel was 14.66 nng.g(-1). The modeling results confirmed the pseudo-second-order sorption for the metal ion. The morphology of these sorbents before and after sorption of Ni(II) was investigated using Scanning Electron Microscopy and the results confirmed the porous structure of these sorbents. [GRAPHICS] .

Automated summary

The new poly(amic-acid)s sorbents with bipyridine chelating groups showed improved thermal stability and high adsorption efficiency for Ni(II), with optimal conditions at 25 degrees C, pH = 4, and after 75 minutes.