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Comparative study of PEO and PVA hydrogels for removal of methylene blue dye from wastewater
Author(s) -
Teixeira Raquel S. P.,
Correa Rodrigo J.,
Bello Forero Josué S.,
Silva Mariana G. S.,
Oliveira Ronaldo C. S.,
Souza Rodrigo S.
Publication year - 2017
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.45043
Subject(s) - self healing hydrogels , adsorption , methylene blue , vinyl alcohol , glutaraldehyde , aqueous solution , ethylene oxide , langmuir adsorption model , chemical engineering , nuclear chemistry , materials science , swelling , polymer chemistry , chemistry , chromatography , polymer , organic chemistry , composite material , copolymer , catalysis , photocatalysis , engineering
In this study, poly(vinyl alcohol) (PVA) and poly(ethylene oxide) (PEO) hydrogels were synthesized and evaluated as adsorbent for dye removal from wastewater using methylene blue (MB) in aqueous solution as probe. PEO samples were photochemically prepared by varying irradiation time (1–16 h), while PVA samples were synthetized with different concentration of glutaraldehyde (GA) (0.03–0.48%). The obtained hydrogels were obtained through the analysis of a swelling test, scanning electron microscopy, and adsorption studies. PEO hydrogels adsorption capacity was dependent on the irradiation time, while the PVA hydrogel adsorption capacity reduces with GA concentration. Both hydrogels demonstrated a Langmuir isotherm adsorption model at the equilibrium and pseudo‐second order kinetic fits properly. pH studies showed that when pH reaches 12, the adsorbed MB amount is close to 8 and 2 times higher than pH = 2 both hydrogels. Photochemical preparation of hydrogels shows an easier way of tuning their properties in order to maximize dye removal. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45043.