2013
DOI: 10.1260/0263-6174.31.8.691
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Polyacrylamide-Based Sorbents for the Removal of Hazardous Metals

Abstract: ABSTRACT:Polyacrylamide was synthesized and chemically modified (PAAm) with 1,2,4,5-tetrahydroxybenzene (THB) or benzene-1,2,4,5-tetrol by applying the reaction conditions of Minisci. A degree of modification as high as 42% was obtained under the following conditions: temperature of 70-80 °C, reaction time of 3 hours and [2,5-dihydroxy-1,4-benzoquinone]-to-[AAm] ratio of 2.5. The synthesized PAAm and its modified form (THB-PAAm) were characterized by UV-Vis, Fourier transform infrared spectroscopy, 13 C nuclea… Show more

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Cited by 12 publications
(16 citation statements)
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“…Indeed, M w of the modified HQ x -PAA (x, a degree of substitution equal to 32 %) was estimated as 2.38 9 10 6 g mole -1 against 2.54 9 10 6 g mole -1 for PAA; that is, the mass of the modified polymer was about 1.06 times lower than the initial molecular weight of PAA, suggesting a degradation occurrence in the course of the modification reaction. This phenomenon was also observed earlier upon the reaction of PAA and PAAm (polyacrylamide) with 2,5-dihydroxybenzoquinone (DHBQ) under identical conditions [5,13]. Neira et al [28] reported the degradation of PAA when grafted onto cellulose using Fenton's reagent (Fe(II)/ H 2 O 2 ), a redox system.…”
Section: ð7þsupporting
confidence: 62%
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“…Indeed, M w of the modified HQ x -PAA (x, a degree of substitution equal to 32 %) was estimated as 2.38 9 10 6 g mole -1 against 2.54 9 10 6 g mole -1 for PAA; that is, the mass of the modified polymer was about 1.06 times lower than the initial molecular weight of PAA, suggesting a degradation occurrence in the course of the modification reaction. This phenomenon was also observed earlier upon the reaction of PAA and PAAm (polyacrylamide) with 2,5-dihydroxybenzoquinone (DHBQ) under identical conditions [5,13]. Neira et al [28] reported the degradation of PAA when grafted onto cellulose using Fenton's reagent (Fe(II)/ H 2 O 2 ), a redox system.…”
Section: ð7þsupporting
confidence: 62%
“…The characteristic bands of the HQ entity appeared clearly as: (1) bands at around 1500-1550 cm -1 , assigned to the aromatic C=C stretching; (2) two sharper bands at 860-870 and 1200-1250 cm -1 , attributable to the angular deformation of C=C and the stretching of C-O, respectively; (3) a band at 1400-1425 cm -1 , assigned to planar C-H band of the benzene ring; and (4) a wide band at around 3400 cm -1 , ascribed to O-H band. The analysis by 13 C NMR spectroscopy further supported the success of the chemical modification of poly(-acrylic acid) (Fig. 3).…”
Section: ð7þmentioning
confidence: 59%
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