Premium
Sorption and thermal properties of strongly basic cross‐linked ionic polymer modified with Cr(III) compounds
Author(s) -
Gutsanu Vasile,
Lisa Gabriela,
Vizir Constantin,
Tudorachi Nita
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.41306
Subject(s) - sorption , sorbent , ion exchange , adsorption , ionic bonding , polymer , materials science , ionic radius , chemistry , chromium , ion , inorganic chemistry , chemical engineering , nuclear chemistry , organic chemistry , metallurgy , engineering
ABSTRACT AV‐17(Cr) material was prepared by modifying a commercial polymer AV‐17 (initially bearing R4N + functional groups) with Cr(III) compounds was investigated. Comparative isotherms characterizing theCrO 4 2 −andCr 2 O 7 2 −ion sorption from solution with pH values of 3 and 8, respectively, at 19°C and 60°C, were obtained using the raw AV‐17(Cl) and the modified AV‐17(Cr) material. The sorption process on AV‐17(Cr) takes place through the coordination of Cr(VI) ions with Cr(III) ions, while on AV‐17(Cl) it is due to an ion exchange mechanism. The sorption isotherms obtained in pH 8 solutions fit perfectly the Langmuir model. The thermodynamic functions ΔG, ΔH, and ΔS characteristic to the adsorption ofCrO 4 2 −ions from K 2 CrO 4 solutions with pH = 8 were calculated. The active sites belonging to the AV‐17(Cr) material were identified as jarosite type compounds of Cr(III). SEM images show that the Cr(III) compounds are present in the form of ultrafine particles located on the surface and within the bulk phase of the polymer granules. Comparative thermal degradation process of both the AV‐17(Cr) and the AV‐17(Cl) material was conducted in air and in an inert atmosphere (He). The thermal degradation mechanism of sorbent AV‐17(Cr) and exchanger AV‐17(Cl) is proposed. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41306.