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Radiation synthesis of graphene oxide/composite hydrogels and their ability for potential dye adsorption from wastewater
Author(s) -
Gad Yasser H.,
Nasef Shaimaa M.
Publication year - 2021
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.51220
Subject(s) - self healing hydrogels , adsorption , thermogravimetric analysis , materials science , graphene , swelling , chemical engineering , composite number , polyvinyl alcohol , nuclear chemistry , freundlich equation , oxide , graphite oxide , polymer chemistry , composite material , chemistry , organic chemistry , nanotechnology , engineering , metallurgy
Abstract A high yield of graphene oxide (GO) was chemically synthesized from graphite powder utilizing adjusted Hummer's method. The contents of acidic functional groups in GO were determined using potentiometric titration. Composite hydrogels dependent on graphene oxide/poly(2‐acrylamido‐2‐methylpropanesulfonic acid)/polyvinyl alcohol (GO/PAMPS/PVA) were synthesized utilizing a 60 Co gamma irradiation source at different doses. The synthesized graphene oxide and composite hydrogels were portrayed via X‐ray diffraction, thermogravimetric analysis, and Fourier transform infrared analysis. The morphology of composite hydrogels was characterized by scanning electron microscope. The gel % and swelling % for the prepared hydrogel demonstrated that the swelling % of hydrogel increased with raising AMPS content. Whereas the increment of GO and increasing the irradiation dose lead to a reduction in the swelling %. The influences of pH, GO percentage, initial dye concentration, the adsorbent dosage, contact time, and temperature on the adsorption of basic blue 3 dye were evaluated and the adsorption capacity was 194.6 mg/g at optimum conditions; pH = 6, GO/PAMPS/PVA composite hydrogels with 5 wt% of GO, initial dye concentration = 200 mg/L, adsorbent dose = 0.1 g, solution volume = 50 mL after 360 min at room temperature (25°C). The adsorption of dye onto the GO/PAMPS/PVA composite hydrogels follows Pseudo‐second‐order adsorption kinetics, fits the Freundlich adsorption isotherm model.