SORPTION OF VANADIUM(V) FROM MINERALIZED CHLORIDESULFATE SOLUTION BY FIBROUS IONITES MATERIALS
Abstract
- In present work, the possibility of recovery of vanadium(V) from mineralized chloride-sulfate solutions by fibrous ionites materials of the FIBAN brand was investigated. (FIBAN is the abbreviation word for fibrous ionites brand which were produced by the Institute of Physical Organic Chemistry, Academy of Sciences of Republic Belarus). Equilibrium and kinetic characteristics of sorption of vanadium(V) by the fibrous ion exchangers (anionites and cationites) FIBAN brand, FIBAN АK-22, FIBAN А-6 and FIBAN K-1, which contain functional groups: – NH2, =NH, ≡N, –COOH,–N + ≡, =NH and –SO3 – H + had been studied. It is established that the maximal sorption capacity of FIBAN AK-22 and FIBAN A-6 with regard to kinetic sorption rate of vanadium (V) is observed at pH=4. Sorption isotherms of vanadium by using FIBAN AK-22 is convex shape being described by Langmuir constant KL= 190 ± 9mL/g (R2 – 0.8) and FIBAN A-6 is linear shape by Henry constant KH = 2.09 ± 0.20 L/g (R2 – 0.95), respectively. Integral sorption kinetic curves were found under conditions of a limited solution volume, and the order of effective diffusion coefficients of vanadium by using anion exchangers FIBAN AK-22 and FIBAN A-6 which are constituted 10-15 and 10-14 m 2 /s respectively. The average apparent activation energies during the sorption of vanadium (V) for anion exchanger FIBAN AK-22 was 6.2 ± 2.0 kJ /mol and for FIBAN A-6, 19.9 ± 4.7 kJ/mol. It may be indicated that the flow of the sorption rate of vanadium and sorption process took place in the external diffusion region. Additionally, the maximum sorption capacity of fibrous саtion exchanger FIBAN K-1 for sorption of vanadium(V) in the form of oxo-vanadate VO2 + was observed at pH = 1. From this study, it was found that cation exchanger has higher sorption rate than anion exchangers.
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Year
- 2020
Author
-
Nway Shwn Oo
Subject
- Chemistry
Publisher
- Myanmar Academy of Arts and Science (MAAS)