Gamma-irradiation synthesis of quaternary phosphonium cationic starch flocculants

Quaternary phosphonium cationic starch (St-g-AM/ATPPB) flocculant was synthesized by using corn starch and acrylamide (AM), allyl triphenyl phosphonium bromide binary (ATPPB) through simultaneous gamma-irradiation. The chemical structure of the copolymer was characterized by FTIR (Fourier transform...

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Bibliographic Details
Published in:Water science and technology 2013-01, Vol.68 (8), p.1778-1784
Main Authors: Song, Weiqiang, Zhao, Zhiwei, Zheng, Hongjuan, Wang, Gaimin
Format: Article
Language:English
Subjects:
Acrylamide
Acrylamide - chemistry
Adsorption
Allyl Compounds - chemistry
Analytical methods
Applied sciences
Cations
Corn
Exact sciences and technology
Flocculants
Flocculation
Fourier transforms
Gamma Rays
Grafting
Infrared spectroscopy
Irradiation
Magnetic Resonance Spectroscopy
Molecular Structure
NMR
Nuclear magnetic resonance
Phosphorous Acids - chemistry
Pollution
Polymers - chemical synthesis
Polymers - chemistry
Quaternary
Ratios
Reduction
Spectroscopy, Fourier Transform Infrared
Starch
Starch - chemistry
Turbidity
Water treatment and pollution
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Summary:Quaternary phosphonium cationic starch (St-g-AM/ATPPB) flocculant was synthesized by using corn starch and acrylamide (AM), allyl triphenyl phosphonium bromide binary (ATPPB) through simultaneous gamma-irradiation. The chemical structure of the copolymer was characterized by FTIR (Fourier transform infrared spectroscopy) and (1)H NMR (nuclear magnetic resonance) technologies. The effects of the absorbed dose in the range of 1 to 6 kGy, AM/ATPPB ratio and starch/(AM + ATPPB) ratio on grafting and flocculation were investigated. At a starch:AM:ATPPB wt ratio of 1:1.4:0.93, the graft ratio of AM/ATPPB reached maximum values at 3 and 6 kGy, and the cationic degree of St-g-AM/ATPPB increased with absorbed dose, while the turbidity reduction reached a maximum value at 5 kGy. At 3 kGy using a starch:(AM + ATPPB) wt. ratio of 1:2.33, the graft ratio of AM and ATPPB increased with AM/ATPPB ratio, while the cationic degree and turbidity reduction reached maximum values at AM:ATPPB wt. ratios of 1:0.67 and 1:0.5, respectively. At a constant AM:ATPPB wt. ratio of 1:0.67 and 3 kGy, the grafting ratio increased with starch/(AM + ATPPB), while the cationic degree and turbidity reduction simultaneously reached maximum values at a starch:(AM + ATPPB) wt. ratio of 1:2.67. Further study revealed that the higher the absorbed dose or the lower the starch/(AM + ATPPB) ratio, the lower the optimal flocculant concentration.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2013.351