Graft copolymerization of acrylonitrile onto delignified native bamboo (Bambusa vulgaris) cellulosic and its utilization potential for heavy metal uptake from aqueous medium
Graft polymerization of acrylonitrile onto delingnified cellulosic material obtained from Nigeria grown Bamboo (Bambusa vulgaris) could be initiated by ceric ammonium nitrate redox system. Optimization of grafting of acrylonitrile onto cellulosic material was performed by varying the reaction condit...
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Veröffentlicht in: | Chemical Industry and Chemical Engineering Quarterly 2011, Vol.17 (2), p.133-140 |
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Sprache: | eng |
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Zusammenfassung: | Graft polymerization of acrylonitrile onto delingnified cellulosic material
obtained from Nigeria grown Bamboo (Bambusa vulgaris) could be initiated by
ceric ammonium nitrate redox system. Optimization of grafting of
acrylonitrile onto cellulosic material was performed by varying the reaction
conditions, such as duration of soaking of cellulosic material in ceric
ammonium nitrate solution, concentration of ceric ammonium nitrate solution,
polymerization time, temperature of reaction, acrylonitrile concentration and
saponification time; to study their influence on percent grafting yield and
grafting efficiency. The resulting cellulosic-g-polyacrylonitrile (PAN)
copolymers were fractionated by extraction at 33?C with N,N? dimethyl
formamide. Fractions were characterized by determining both the % add-on and
the free polymer. Saponification of grafted copolymer was done by reaction
with sodium hydroxide followed by methanol precipitation. The absorbent
polymer so produced gave a fair water retention values. The optimum reaction
conditions obtained were: 20mmol/l ceric ammonium nitrate solution in 1%
nitric acid, soaking duration of 0.5h at 40?C for a polymerization time of 2h
and saponification time of 3h.The percent grafting is 167.89%, grafting
efficiency is 93.52% and water retention value is 389g/g. The grafting was
confirmed using FTIR. Sorption of different metal ions in the mixture e.g.
Cr, Mn, Ni, Cu and Pb by grafted cellulosic and the hydrogel was also
investigated. Hydrolysis increases the sorption affinity of grafted cellulose
toward water and metal ions.
nema |
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ISSN: | 1451-9372 2217-7434 |
DOI: | 10.2298/CICEQ101021063E |